Can Testosterone Affect Orthodontic Tooth Movement?

A 2026 animal study published in the Journal of Periodontology investigated how altered testosterone levels affect orthodontic tooth movement (OTM), alveolar bone remodeling, periodontal tissues, and root resorption.

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The findings indicate that both testosterone deficiency and high-dose anabolic-androgenic steroid exposure can modify the biological response to orthodontic force in a pubertal male rat model.

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The study provides experimental evidence that testosterone-related disturbances may influence the tissues involved in orthodontic tooth movement. However, because the research was conducted in rats, the findings cannot be directly applied to human orthodontic treatment.

🔹 Study Design
The researchers used a pubertal male rat model to investigate the effects of testosterone dysfunction during orthodontic tooth movement.
Testosterone deficiency was induced through orchiectomy. The researchers subsequently administered testosterone undecanoate, an anabolic-androgenic steroid (AAS), at replacement and high doses.
Orthodontic tooth movement was produced by applying a closed-coil spring to the maxillary right first molar. The surrounding alveolar bone and periodontal ligament were evaluated at 5 and 10 days after orthodontic force application.
The investigators used several analytical methods, including micro-computed tomography (micro-CT), reverse-transcription quantitative polymerase chain reaction (RT-qPCR), and immunohistochemistry. Root resorption and plasma concentrations of testosterone and adrenocorticotropic hormone were also evaluated.

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🔹 Testosterone Dysfunction Altered Bone Microarchitecture
Both testosterone deficiency and high-dose AAS exposure produced significant changes in bone microarchitecture.
The researchers reported reductions in trabecular thickness and bone connectivity, together with changes involving bone lacunae.
These findings indicate that altered testosterone conditions affected the alveolar bone response during the experimental orthodontic procedure.
The study also found that testosterone dysfunction was associated with greater rotation and intrusion of the orthodontically moved tooth. These observations were obtained from the animal model and should not be interpreted as evidence that testosterone manipulation produces predictable changes in the rate or direction of orthodontic tooth movement in humans.

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🔹 High-Dose Anabolic Steroids and Root Resorption
One of the clinically relevant findings involved inflammatory changes and root resorption.
According to the study, high-dose AAS exposure intensified the inflammatory infiltrate and root resorption associated with orthodontic tooth movement.
Root resorption is a biological consequence that can occur during orthodontic tooth movement. In this experimental model, the researchers found that high-dose androgen exposure was associated with a greater resorptive response.
The study therefore identifies a potential relationship between androgen disturbance and orthodontically induced tissue changes. However, it does not establish that anabolic-androgenic steroid use causes clinically significant root resorption in human orthodontic patients.

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🔹 Changes in Bone-Related Gene Expression
The investigators also examined molecular markers associated with bone metabolism.
Testosterone dysfunction altered the expression of several genes, including:
▪️ Runx2
▪️ Bmp2
▪️ Spp1
▪️ Bglap
The study also identified deregulation of the RANK/RANKL/OPG pathway following testosterone disturbances.
These molecular findings provide additional evidence that altered testosterone conditions affected biological pathways involved in bone remodeling during orthodontic tooth movement.

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🔹 Testosterone Replacement Did Not Fully Restore the Response
An important finding was that administration of AAS at replacement doses did not normalize the inflammatory infiltrate, orthodontic tooth movement, or the expression of the studied genes to control levels.
Therefore, the experimental response observed in testosterone-deficient animals was not simply reversed by testosterone administration at the replacement dose used in the study.
This finding suggests that the biological effects associated with testosterone disturbance were not completely restored under the experimental conditions evaluated.

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🔹 What Do These Findings Mean for Orthodontics?
The study provides evidence that testosterone dysfunction can influence several biological processes associated with orthodontic tooth movement, including:
▪️ alveolar bone microarchitecture;
▪️ periodontal inflammatory response;
▪️ tooth movement characteristics;
▪️ root resorption; and
▪️ expression of genes involved in bone metabolism.
However, the study does not establish a clinical protocol for modifying testosterone levels during orthodontic treatment.
It also does not demonstrate that testosterone supplementation can accelerate orthodontic treatment or that testosterone deficiency necessarily causes slower tooth movement in humans.
The experimental findings should therefore be interpreted as evidence of a biological relationship that requires further investigation.

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🔹 Important Study Limitation
The principal limitation is the experimental model.
The study was conducted in pubertal male rats, and orthodontic tooth movement was produced experimentally using a closed-coil spring on a maxillary first molar. The observation periods were limited to 5 and 10 days.
Human orthodontic treatment differs substantially from this experimental model in anatomy, skeletal development, treatment duration, biomechanics, hormonal physiology, and clinical management.
Consequently, the findings cannot currently be used to predict how an individual human patient will respond to orthodontic treatment based on testosterone levels.

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💬 Discussion
The 2026 study by Reis et al. provides experimental evidence that testosterone dysfunction can modify bone remodeling, periodontal inflammation, orthodontic tooth movement, and root resorption in a pubertal male rat model.
Both testosterone deficiency and high-dose anabolic-androgenic steroid exposure produced alterations in alveolar bone microarchitecture. High-dose AAS exposure was additionally associated with increased inflammatory infiltration and root resorption, while testosterone disturbances affected several genes and signaling pathways involved in bone metabolism.
These findings expand the experimental understanding of systemic hormonal influences on orthodontic tooth movement. Nevertheless, human clinical studies are required before the findings can be translated into orthodontic treatment recommendations.

📚 References

Reis, C. L. B., Galisteu-Luiz, K., Pedroso, G. L., Puls, G. L., Cassaro, L., Vieira, B. B., Lourenço Romano, F., Küchler, E. C., Kirschneck, C., de Oliveira, D. S. B., Stuani, M. B. S., & Matsumoto, M. A. N. (2026). Effects of testosterone and high-dose anabolic steroids on orthodontic-induced bone remodeling and root resorption: An animal study. Journal of Periodontology. Advance online publication. https://doi.org/10.1002/jper.70068

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Vertical Malocclusions in Primary, Mixed, and Permanent Dentition

Vertical malocclusions are bite problems that affect the vertical relationship between the upper and lower teeth. Instead of meeting normally when the mouth closes, the teeth may overlap too much or fail to touch at all.

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These conditions can influence chewing, speech, facial appearance, and jaw function.

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Vertical discrepancies may appear during primary, mixed, or permanent dentition and can result from genetic factors, oral habits, or altered facial growth. Early diagnosis helps guide treatment at the most appropriate stage of development, often reducing the need for more complex procedures later in life.

🔹 What Is a Vertical Malocclusion?
A vertical malocclusion is an abnormal relationship of the teeth or jaws in the vertical dimension. The two most common forms are:

▪️ Deep Bite (Excessive Overbite)
▪️ Anterior Open Bite
These conditions may have a dental origin, a skeletal origin, or a combination of both.

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🔹 Main Types of Vertical Malocclusions

1. Deep Bite (Deep Overbite)
A deep bite occurs when the upper front teeth excessively overlap the lower front teeth, sometimes covering most or all of the lower incisors.
Common characteristics
▪️ Excessive vertical overlap of anterior teeth
▪️ Increased risk of palatal trauma
▪️ Tooth wear
▪️ Functional limitations in severe cases
Deep bite is frequently associated with short lower facial height and strong bite muscles.

2. Anterior Open Bite
An anterior open bite is present when the upper and lower front teeth do not touch when the back teeth are in contact.
Common characteristics
▪️ Space between upper and lower incisors
▪️ Difficulty biting food
▪️ Speech alterations
▪️ Tongue thrusting in some patients
Open bite may be dental, skeletal, or functional.

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🔹 Vertical Malocclusions by Dentition Stage

Primary Dentition
Vertical problems during primary dentition are commonly associated with:
▪️ Thumb sucking
▪️ Prolonged pacifier use
▪️ Tongue thrusting
▪️ Mouth breathing
Many mild cases improve after harmful habits stop, but persistent open bites require professional evaluation.

Mixed Dentition
The mixed dentition provides an excellent opportunity for interceptive orthodontic treatment.
Management may include:
▪️ Habit interception
▪️ Myofunctional therapy
▪️ Orthodontic appliances
▪️ Growth modification when indicated
Early treatment improves the chances of correcting developing skeletal discrepancies.

Permanent Dentition
Once facial growth is complete, treatment becomes more individualized.
Options may include:
▪️ Fixed orthodontic appliances
▪️ Temporary Anchorage Devices (TADs)
▪️ Orthognathic surgery for severe skeletal open bite or deep bite
▪️ Multidisciplinary treatment when necessary

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🔹 Main Causes
Vertical malocclusions often result from multiple factors, including:

▪️ Genetic facial growth patterns
▪️ Thumb or finger sucking
▪️ Prolonged pacifier use
▪️ Tongue thrust habit
▪️ Mouth breathing
▪️ Abnormal eruption patterns
▪️ Neuromuscular factors
▪️ Skeletal growth discrepancies

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🔹 Clinical Signs
Patients may present with:

▪️ Deep Bite
▪️ Excessive incisor overlap
▪️ Lower incisor wear
▪️ Palatal trauma
▪️ Reduced lower facial height

Anterior Open Bite
▪️ Visible gap between front teeth
▪️ Difficulty biting foods
▪️ Speech difficulties
▪️ Tongue thrust during swallowing
▪️ Increased lower facial height in skeletal cases

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🔹 Diagnosis
A comprehensive diagnosis includes:

▪️ Medical and dental history
▪️ Clinical examination
▪️ Facial analysis
▪️ Occlusal evaluation
▪️ Measurement of overbite
▪️ Functional assessment
▪️ Digital models or study casts
▪️ Cephalometric analysis
▪️ CBCT, only when clinically justified
Differentiating dental from skeletal vertical discrepancies is essential for selecting the correct treatment.

🔹 Treatment Overview

Condition	Preferred Management
Dental Deep Bite	Orthodontic intrusion of anterior teeth, bite-opening mechanics, bite turbos, or arch leveling depending on the patient's needs.
Skeletal Deep Bite	Growth modification in growing patients or orthognathic surgery combined with orthodontic treatment in severe adult cases.
Dental Anterior Open Bite	Elimination of oral habits, myofunctional therapy when indicated, and orthodontic correction with fixed or removable appliances.
Skeletal Anterior Open Bite	Treatment with Temporary Anchorage Devices (TADs), skeletal anchorage mechanics, or orthognathic surgery for severe skeletal discrepancies.

🔹 Possible Consequences if Untreated
Untreated vertical malocclusions may lead to:

▪️ Abnormal tooth wear
▪️ Chewing difficulties
▪️ Speech problems
▪️ Periodontal trauma
▪️ Poor smile aesthetics
▪️ Reduced occlusal stability
▪️ Temporomandibular disorders in susceptible individuals

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💬 Discussion
Recent orthodontic evidence emphasizes that vertical malocclusions require individualized diagnosis, as the underlying cause determines the most effective treatment. While habit-related open bites often respond well to early intervention, skeletal discrepancies may require orthopedic treatment during growth or surgical correction in adulthood. Careful evaluation of facial growth, dental eruption, and oral function is essential for achieving stable long-term results.

🎯 Recommendations
▪️ Perform routine orthodontic screening during childhood.
▪️ Eliminate thumb sucking and prolonged pacifier use early.
▪️ Monitor tongue posture and swallowing patterns.
▪️ Refer patients with persistent open bite or deep bite for orthodontic evaluation.
▪️ Base treatment decisions on growth stage and skeletal diagnosis rather than age alone.
▪️ Use advanced imaging only when clinically indicated.

✍️ Conclusion
Vertical malocclusions are common developmental conditions that may affect patients from primary through permanent dentition. Their impact extends beyond tooth alignment, influencing facial growth, oral function, and long-term stability. Early identification of harmful habits and accurate differentiation between dental and skeletal causes allow clinicians to provide more effective, less invasive treatment and improve overall oral health outcomes.

📊 Summary Table

Aspect	Key Information
Definition	Abnormal vertical relationship between the upper and lower teeth or jaws.
Main Types	Deep bite (deep overbite) and anterior open bite.
Primary Dentition	Often associated with thumb sucking, prolonged pacifier use, tongue thrusting, and mouth breathing.
Mixed Dentition	Ideal stage for interceptive orthodontics, habit control, and growth modification.
Permanent Dentition	Treatment may include fixed appliances, TADs, or orthognathic surgery depending on severity.
Main Causes	Genetics, oral habits, tongue thrust, mouth breathing, and skeletal growth discrepancies.
Diagnosis	Clinical examination, facial analysis, overbite measurement, study models, cephalometric analysis, and CBCT when indicated.
Early Intervention	Improves treatment outcomes, supports normal facial growth, and may reduce the need for surgery later.

📚 References

✔ Graber, L. W., Vanarsdall, R. L., Vig, K. W. L., & Huang, G. J. (2023). Orthodontics: Current Principles and Techniques (7th ed.). Elsevier.
✔ Proffit, W. R., Fields, H. W., Larson, B. E., & Sarver, D. M. (2023). Contemporary Orthodontics (7th ed.). Elsevier.
✔ Ngan, P., & Fields, H. W. (1997). Open bite: A review of etiology and management. Pediatric Dentistry, 19(2), 91–98.
✔ Greenlee, G. M., Huang, G. J., Chen, S. S., Chen, J., Koepsell, T., & Hujoel, P. (2011). Stability of treatment for anterior open-bite malocclusion: A meta-analysis. American Journal of Orthodontics and Dentofacial Orthopedics, 139(2), 154–169.
✔ American Association of Orthodontists. (2024). Clinical Practice Resources. American Association of Orthodontists.

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How Can Excessive Tooth Mobility Be Managed During Orthodontics?

Maintaining tooth stability during orthodontic treatment is essential for safe, predictable, and successful tooth movement.

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Although mild tooth mobility is a normal biological response to braces or clear aligners, excessive mobility may indicate that the supporting tissues need additional attention.

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Orthodontic treatment is designed to move teeth through gentle, controlled forces that stimulate natural bone remodeling. During this process, teeth may temporarily feel slightly loose before becoming stable again.
The goal is not to eliminate mobility completely, but to keep it within healthy physiological limits while protecting the bone, gums, and periodontal ligament.
Understanding how tooth stability is maintained, how to minimize unnecessary mobility, and when excessive movement becomes a concern helps patients actively participate in their treatment and supports long-term oral health.

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🔹 What Is Tooth Stability?
Tooth stability refers to a tooth's ability to remain securely supported within the jawbone while still allowing the small amount of natural movement provided by the periodontal ligament.
Healthy teeth are never completely rigid. Instead, they are suspended by the periodontal ligament (PDL), which cushions chewing forces and allows controlled orthodontic movement without damaging the surrounding tissues.
Throughout orthodontic treatment, the objective is to maintain this delicate balance between controlled tooth movement and healthy periodontal support.

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🔹 Why Does Tooth Mobility Increase During Orthodontic Treatment?
When orthodontic appliances apply gentle force to a tooth, the tissues surrounding the root begin to remodel.

This biological process includes:
▪️ Bone resorption on the pressure side.
▪️ New bone formation on the tension side.
▪️ Temporary widening of the periodontal ligament.
As a result, teeth may feel slightly more mobile while they are moving. In healthy patients, this increase in mobility is temporary and expected.

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🔹 How Is Tooth Stability Maintained During Orthodontic Treatment?
Maintaining tooth stability depends on both the orthodontist and the patient.

1. Using Light, Controlled Orthodontic Forces
Modern orthodontics relies on continuous, low-force mechanics rather than heavy pressure.
Gentle forces:
▪️ reduce unnecessary stress on the periodontal ligament,
▪️ promote healthy bone remodeling,
▪️ decrease the risk of excessive mobility,
▪️ lower the chance of root resorption.

2. Maintaining Excellent Oral Hygiene
Healthy gums provide a stronger foundation for tooth movement.
Daily brushing, flossing, and professional cleanings help prevent gingivitis and periodontitis, which can significantly increase tooth mobility.

3. Controlling Gum Inflammation
Inflamed periodontal tissues become more susceptible to movement.
Treating gingivitis early helps preserve the supporting bone and improves overall tooth stability throughout treatment.

4. Following Orthodontic Instructions
Patients should:
▪️ Wear aligners for the recommended number of hours each day.
▪️ Use elastics exactly as prescribed.
▪️ Avoid skipping appointments.
Following the treatment plan allows tooth movement to occur at a healthy biological pace.
5. Avoiding Excessive Biting Forces
Hard foods and harmful habits can place unnecessary stress on already moving teeth.
Patients should avoid:
▪️ ice
▪️ hard candy
▪️ popcorn kernels
▪️ chewing pens or fingernails
▪️ opening packages with their teeth
Reducing unnecessary forces helps protect the periodontal ligament.

6. Monitoring Periodontal Health
Regular clinical examinations allow the orthodontist to evaluate:
▪️ gum health,
▪️ bone support,
▪️ tooth mobility,
▪️ treatment progress.
Early detection of periodontal problems helps prevent complications.

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🔹 What Happens If Tooth Mobility Becomes Excessive?
Although mild mobility is normal, excessive tooth mobility should never be ignored.
When movement exceeds normal physiological limits, it may indicate that the supporting tissues are under excessive stress or affected by another condition.

Possible causes include:
▪️ Excessive orthodontic forces
▪️ Poor oral hygiene
▪️ Gingivitis or periodontitis
▪️ Traumatic biting forces
▪️ Reduced bone support
▪️ External root resorption
▪️ Systemic conditions affecting bone health
If left untreated, excessive mobility may slow orthodontic progress and increase the risk of periodontal complications.

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🔹 Warning Signs That Require Professional Evaluation
Patients should contact their orthodontist if they experience:

▪️ A tooth that suddenly becomes much looser than before.
▪️ Persistent pain lasting several days.
▪️ Swollen or bleeding gums around a mobile tooth.
▪️ Pus or signs of infection.
▪️ Difficulty chewing because a tooth feels unstable.
▪️ Mobility that continues to worsen instead of improving.
Early evaluation helps identify the cause before permanent damage occurs.

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🔹 Can Excessive Tooth Mobility Be Reduced?
Yes. In most cases, excessive tooth mobility can be reduced once the underlying cause has been identified and corrected. The primary objective is to allow the periodontal ligament and surrounding alveolar bone to recover before additional tooth movement is attempted.

1. Temporarily Pause Active Tooth Movement
If mobility is greater than expected, the orthodontist may temporarily stop active mechanics on the affected tooth.
In most cases, active forces are suspended for approximately 2–6 weeks, depending on:
▪️ the degree of tooth mobility,
▪️ periodontal health,
▪️ the presence of inflammation,
▪️ radiographic findings,
▪️ and the patient's biological response.
This pause allows the periodontal ligament to reorganize and bone remodeling to progress without additional mechanical stress.

2. Use Passive Orthodontic Wires
Rather than removing the orthodontic appliance completely, clinicians often place a passive stainless steel archwire that stabilizes the tooth while minimizing active force delivery.
Common examples include:
▪️ 0.016-inch stainless steel round wire
▪️ 0.018-inch stainless steel round wire
▪️ 0.016 × 0.022-inch stainless steel rectangular wire (when greater stability is required)
The wire should remain passive, without activating bends or closing mechanics.

3. Maintain Bracket Engagement
Keeping the bracket engaged with passive elastic ligatures or stainless steel ligatures may help maintain tooth position while avoiding additional orthodontic force.
The goal is stabilization rather than movement.

4. Eliminate Contributing Factors
Before restarting treatment, the orthodontist should address any factors contributing to excessive mobility, such as:

▪️ Plaque accumulation
▪️ Gingival inflammation
▪️ Traumatic occlusal contacts
▪️ Excessive orthodontic force
▪️ Poor patient compliance with appliance instructions
Professional periodontal therapy may be indicated if inflammation is present.

5. Reassess Before Reactivating Treatment
Treatment should only resume after clinical signs indicate that the supporting tissues have recovered.

Positive findings include:
▪️ Reduced tooth mobility compared with the previous appointment.
▪️ Healthy pink gingiva without bleeding on probing.
▪️ No spontaneous pain or tenderness to percussion.
▪️ Improved patient comfort during chewing.
▪️ No progressive radiographic signs of bone loss or root resorption.
Once stability improves, orthodontic movement is typically restarted using light continuous forces, avoiding heavy activation.

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💬 Discussion
Scientific evidence shows that temporary tooth mobility is an expected part of orthodontic tooth movement, reflecting normal bone remodeling rather than damage. The key objective is not to eliminate mobility, but to ensure that it remains within physiological limits while the periodontal ligament and alveolar bone adapt to the applied forces.
Excessive mobility, however, deserves careful clinical evaluation. It may result from excessive orthodontic forces, periodontal inflammation, inadequate bone support, or external root resorption. Fortunately, when these factors are identified early and managed appropriately, treatment can often continue successfully without compromising long-term tooth stability.
Successful orthodontic treatment therefore depends on the combination of appropriate biomechanics, healthy periodontal tissues, and active patient cooperation.

🎯 Recommendations
▪️ Maintain excellent oral hygiene throughout treatment.
▪️ Attend every scheduled orthodontic appointment.
▪️ Wear aligners, elastics, and retainers exactly as instructed.
▪️ Avoid hard foods and habits that overload moving teeth.
▪️ Do not intentionally test or wiggle mobile teeth.
▪️ Report any sudden increase in tooth mobility, pain, swelling, or bleeding immediately.
▪️ Keep regular periodontal evaluations, especially if you have a history of gum disease.

✍️ Conclusion
Tooth stability during orthodontic treatment depends on maintaining a healthy balance between controlled tooth movement and periodontal health. Mild tooth mobility is a normal and temporary response to orthodontic forces, but excessive mobility should always be assessed to identify possible underlying causes.
With gentle orthodontic mechanics, excellent oral hygiene, healthy gums, and regular professional monitoring, most patients complete treatment safely while preserving long-term tooth stability. Early recognition of abnormal mobility allows timely intervention and helps protect both the teeth and their supporting tissues.

📚 References

✔ Krishnan, V., & Davidovitch, Z. (2006). Cellular, molecular, and tissue-level reactions to orthodontic force. American Journal of Orthodontics and Dentofacial Orthopedics, 129(4), 469.e1–469.e32. https://doi.org/10.1016/j.ajodo.2005.10.007
✔ Nanci, A. (2021). Ten Cate's Oral Histology: Development, Structure, and Function (10th ed.). Elsevier.
✔ Proffit, W. R., Fields, H. W., Larson, B., & Sarver, D. M. (2023). Contemporary Orthodontics (7th ed.). Elsevier.
✔ Ren, Y., Maltha, J. C., & Kuijpers-Jagtman, A. M. (2003). Optimum force magnitude for orthodontic tooth movement: A systematic literature review. The Angle Orthodontist, 73(1), 86–92.
✔ Roberts, W. E., Viecilli, R. F., Chang, C., Katona, T. R., & Paydar, N. H. (2015). Biology of tooth movement. In R. Nanda & T. F. Ackerman (Eds.), Orthodontics: Current Principles and Techniques (6th ed.). Elsevier.
✔ Zachrisson, B. U. (2007). Orthodontics and periodontics. In J. Lindhe, N. P. Lang, & T. Karring (Eds.), Clinical Periodontology and Implant Dentistry (5th ed.). Blackwell Munksgaard.

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Tooth Mobility During Orthodontics: What's Normal?

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Orthodontic treatment works by applying gentle, controlled forces that stimulate the surrounding bone and periodontal ligament to remodel, allowing teeth to move into healthier positions. This biological process naturally causes a small increase in tooth mobility before the tissues stabilize again.

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Understanding why teeth become temporarily mobile, what level of movement is expected, and when mobility may indicate a problem helps patients stay informed and reduces unnecessary anxiety throughout treatment.

🔹 What Is Tooth Mobility?
Tooth mobility refers to the small amount of movement a tooth can make within its socket when gentle pressure is applied.
Healthy teeth are not completely rigid. They are supported by the periodontal ligament (PDL), a thin layer of specialized connective tissue that acts as a natural shock absorber between the tooth root and the surrounding bone. Because of this ligament, every healthy tooth has a slight degree of physiological mobility.
During orthodontic treatment, this natural mobility temporarily increases as the bone remodels to allow tooth movement.

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🔹 Why Do Teeth Become Mobile During Orthodontic Treatment?
Orthodontic appliances move teeth by applying light and continuous forces.

These forces create two biological responses:
▪️ Bone resorption on the pressure side, allowing the tooth to move.
▪️ New bone formation on the tension side, stabilizing the tooth in its new position.
At the same time, the periodontal ligament temporarily widens, making the tooth feel slightly looser than usual.
This process is completely normal when orthodontic forces are carefully controlled by a dental professional.

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🔹 Is Tooth Mobility Normal During Orthodontics?
Yes. Mild tooth mobility is expected during orthodontic treatment.
Most patients experience some degree of looseness, particularly during the first months of treatment or after adjustments.

The amount of mobility varies depending on several factors, including:
▪️ Age
▪️ Bone quality
▪️ Type of orthodontic appliance
▪️ Magnitude of orthodontic force
▪️ Individual biological response
▪️ Periodontal health
In healthy patients, mobility gradually decreases as the surrounding bone adapts to the new tooth position.

🔹 When Is Tooth Mobility Most Noticeable?
Tooth mobility tends to change throughout treatment.

Treatment Stage	Expected Mobility
Initial alignment	Most noticeable
Leveling and alignment	Mild to moderate
Space closure	Moderate
Root positioning (torque control)	Usually mild
Finishing and detailing	Minimal
Retention phase	Progressively decreases

Although slight mobility can persist for several weeks after treatment, the supporting tissues gradually regain stability.

🔹 Factors That Can Increase Tooth Mobility
Several conditions may increase mobility beyond what is normally expected:

▪️ Poor oral hygiene
▪️ Gingivitis or periodontitis
▪️ Excessive orthodontic forces
▪️ Smoking
▪️ Diabetes with poor glycemic control
▪️ Reduced bone support
▪️ Short roots or external root resorption
▪️ Traumatic biting forces
For this reason, maintaining healthy gums throughout orthodontic treatment is essential.

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🔹 Tooth Mobility vs. Periodontal Disease
Not all tooth mobility has the same cause.

Normal Orthodontic Mobility	Mobility Caused by Periodontal Disease
Temporary	Often progressive
Caused by controlled tooth movement	Caused by bone loss due to periodontal infection
Usually painless	May be associated with swollen, bleeding gums
Improves after orthodontic treatment	May worsen without periodontal therapy
Surrounding tissues remain healthy	Supporting bone is reduced, compromising tooth stability

This distinction is important because physiological orthodontic mobility is reversible, whereas mobility caused by periodontal disease requires professional treatment.

🔹 When Should Tooth Mobility Be a Concern?
Although mild mobility is expected, patients should contact their orthodontist if they notice:

▪️ Sudden or excessive tooth looseness
▪️ Persistent or severe pain
▪️ Swelling or pus around a tooth
▪️ Heavy bleeding of the gums
▪️ A tooth that feels increasingly unstable over time
▪️ Difficulty biting due to tooth movement outside the treatment plan
These signs may indicate inflammation, trauma, periodontal disease, or another condition requiring evaluation.

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🔹 How Can Patients Help Keep Their Teeth Stable?
Patients can reduce unnecessary mobility and support healthy tooth movement by following these recommendations:

▪️ Brush and floss carefully every day.
▪️ Attend all scheduled orthodontic appointments.
▪️ Avoid biting hard foods, ice, or non-food objects.
▪️ Wear aligners or elastics exactly as instructed.
▪️ Maintain healthy gums through regular professional cleanings.
▪️ Do not attempt to test or wiggle loose teeth.
Good oral hygiene and regular follow-up appointments are the most effective ways to support safe orthodontic treatment.

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💬 Discussion
Modern orthodontics relies on a well-understood biological process known as bone remodeling. Scientific evidence consistently shows that temporary tooth mobility is a normal consequence of controlled orthodontic forces, reflecting the adaptation of the periodontal ligament and surrounding alveolar bone rather than permanent damage.
However, mobility should always be interpreted within the patient's overall periodontal condition. Factors such as active periodontal disease, poor oral hygiene, smoking, systemic diseases, or excessive orthodontic forces can increase mobility beyond physiological limits. For this reason, careful diagnosis and regular monitoring remain essential throughout treatment.
Patient education also plays an important role. Explaining that mild mobility is expected helps reduce anxiety, improves treatment compliance, and encourages patients to seek professional advice only when warning signs appear.

🎯 Recommendations
▪️ Expect mild tooth mobility as a normal part of orthodontic treatment.
▪️ Keep excellent oral hygiene to protect the gums and supporting bone.
▪️ Attend every orthodontic adjustment and follow your orthodontist's instructions carefully.
▪️ Avoid hard or sticky foods that place excessive stress on moving teeth.
▪️ Report any sudden increase in mobility, pain, swelling, or bleeding immediately.
▪️ Continue wearing retainers after treatment, as instructed, to allow the supporting tissues to stabilize.

✍️ Conclusion
Tooth mobility during orthodontic treatment is generally a normal, temporary, and expected biological response to controlled tooth movement. As the periodontal ligament and surrounding bone remodel, teeth may feel slightly loose before becoming stable again.
Most cases require no additional treatment beyond proper orthodontic care and good oral hygiene. Nevertheless, mobility associated with pain, infection, significant bone loss, or progressive instability should always be evaluated promptly by a dental professional.
Understanding the difference between physiological orthodontic mobility and pathological mobility helps patients approach treatment with confidence while recognizing the situations that require professional attention.

📚 References

✔ Burstone, C. J. (1962). The biomechanics of tooth movement. In Vistas in Orthodontics (pp. 197–213). Lea & Febiger.
✔ Krishnan, V., & Davidovitch, Z. (2006). Cellular, molecular, and tissue-level reactions to orthodontic force. American Journal of Orthodontics and Dentofacial Orthopedics, 129(4), 469.e1–469.e32. https://doi.org/10.1016/j.ajodo.2005.10.007
✔ Nanci, A. (2021). Ten Cate's Oral Histology: Development, Structure, and Function (10th ed.). Elsevier.
✔ Proffit, W. R., Fields, H. W., Larson, B., & Sarver, D. M. (2023). Contemporary Orthodontics (7th ed.). Elsevier.
✔ Ren, Y., Maltha, J. C., & Kuijpers-Jagtman, A. M. (2003). Optimum force magnitude for orthodontic tooth movement: A systematic literature review. The Angle Orthodontist, 73(1), 86–92.
✔ Roberts, W. E., Viecilli, R. F., Chang, C., Katona, T. R., & Paydar, N. H. (2015). Biology of tooth movement. In J. Huang, R. Li, & K. J. C. Kuijpers (Eds.), Orthodontics: Current Principles and Techniques (6th ed.). Elsevier.
✔ Sandy, J. R., & Farndale, R. W. (2014). Orthodontic tooth movement: Current concepts and future directions. British Dental Journal, 217(8), 467–473.

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Best Archwire Sequence for Extraction Cases?

Orthodontic extraction cases are among the most complex treatments because tooth movement must be carefully controlled while closing spaces and maintaining proper bite alignment.

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Dental Article 🔽 Orthodontic Archwire Selection Guide: Types and Functions ... Different archwires have different properties. Some are flexible and ideal for the beginning of treatment, while others are stronger and provide precise tooth control during the final stages.

Choosing the correct archwire sequence helps improve efficiency, reduces unwanted tooth movement, and provides better control throughout treatment.

Advertisement

There is no single sequence that fits every patient, but evidence and current clinical practice support a predictable progression based on the biological stages of tooth movement. The following guide explains the most commonly recommended sequence using simple language while maintaining scientific accuracy.

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Dental Article 🔽 Orthodontic Archwire Sequence: Complete Clinical Guide ... Choosing the correct orthodontic archwire sequence is one of the most important factors in successful orthodontic treatment.

🔹 Why Does the Archwire Sequence Matter?
An orthodontic archwire is responsible for transmitting force from the brackets to the teeth.

Using the wrong wire at the wrong stage may lead to:
▪️ Longer treatment time
▪️ Poor root control
▪️ Loss of anchorage
▪️ Excessive tipping of teeth
▪️ Greater patient discomfort
A logical progression allows teeth to move safely while gradually increasing control.

🔹 Recommended Archwire Sequence for Extraction Cases

Treatment Stage	Recommended Archwire	Main Purpose
Initial Alignment	0.012 or 0.014 NiTi (Round)	Gentle alignment and leveling.
Early Leveling	0.016 NiTi (Round)	Continue alignment and reduce crowding.
Late Leveling	0.018 or 0.020 NiTi (Round)	Complete leveling before torque control.
Initial Torque Control	0.016 × 0.022 NiTi (Rectangular)	Begin root positioning and torque expression.
Advanced Torque Control	0.017 × 0.025 NiTi (Rectangular)	Improve root control before space closure.
Working Phase	0.019 × 0.025 Stainless Steel	Space closure, sliding mechanics, and anchorage control.
Finishing	0.019 × 0.025 Stainless Steel or TMA	Final detailing, occlusal adjustments, and stabilization.

🔹 Why Start with Round NiTi Wires?
Nickel-Titanium (NiTi) wires are highly flexible and deliver light, continuous forces.

Their advantages include:
▪️ Better patient comfort
▪️ Efficient correction of crowding
▪️ Reduced risk of excessive force
▪️ Improved biological response
Round wires are excellent for aligning teeth but provide limited control of root position.

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🔹 Why Switch to Rectangular NiTi?
Once the teeth are aligned, treatment requires better control of tooth roots, especially before closing extraction spaces.

Rectangular NiTi wires begin to express:
▪️ Torque
▪️ Root positioning
▪️ Bracket prescription
▪️ Arch coordination
This transition prepares the dentition for efficient space closure.

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🔹 Why Is Stainless Steel the Preferred Working Wire?
Most orthodontists choose 0.019 × 0.025 stainless steel before beginning extraction space closure because it offers:

▪️ Excellent rigidity
▪️ Superior anchorage control
▪️ Minimal wire deformation
▪️ Efficient sliding mechanics
▪️ Better control during retraction
This wire is considered the clinical standard for many extraction protocols.

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🔹 Can Treatment Skip Some Wires?
Yes.

Modern orthodontics often skips intermediate wires when:
▪️ Initial crowding is mild.
▪️ Teeth respond quickly.
▪️ Self-ligating systems are used.
▪️ The clinician has sufficient experience.
However, skipping wires should never compromise root control or patient safety.

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🔹 Is TMA Necessary?
Titanium-Molybdenum Alloy (TMA) is not mandatory.

It is mainly used when clinicians need:
▪️ Moderate flexibility
▪️ More precise bends
▪️ Better spring-back than stainless steel
Many successful extraction treatments are completed without using TMA.

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🔹 Common Mistakes
Avoid these frequent errors:

▪️ Starting space closure too early
▪️ Using stainless steel before alignment is complete
▪️ Skipping torque control
▪️ Applying excessive retraction force
▪️ Ignoring anchorage management
These mistakes may increase treatment time and compromise the final result.

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🔹 Clinical Tips
For most conventional extraction treatments:
0.014 NiTi → 0.016 NiTi → 0.018/0.020 NiTi → 0.016×0.022 NiTi → 0.017×0.025 NiTi → 0.019×0.025 Stainless Steel

This progression provides an excellent balance between:
▪️ Efficient alignment
▪️ Root control
▪️ Anchorage preservation
▪️ Predictable space closure
Individual modifications should always be based on the patient's malocclusion, bracket slot size, biomechanics, and treatment goals.

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💬 Discussion
Current orthodontic evidence indicates that there is no universally superior archwire sequence for extraction cases. Instead, successful treatment depends on selecting wires that match each biological stage of tooth movement. While modern systems may reduce the number of wire changes, most specialists still recommend progressing from round NiTi for alignment to rectangular NiTi for torque control and finally to rectangular stainless steel for space closure and finishing. This sequence provides a balance between efficiency, patient comfort, and biomechanical control.

🎯 Recommendations
▪️ Use light-force NiTi wires during initial alignment to minimize discomfort and support healthy tooth movement.
▪️ Do not begin extraction space closure until alignment and leveling are complete.
▪️ Introduce rectangular NiTi wires before space closure to establish adequate torque and root control.
▪️ Use 0.019 × 0.025 stainless steel as the primary working wire for sliding mechanics in most extraction protocols.
▪️ Adapt the sequence to each patient, considering crowding severity, anchorage requirements, bracket slot dimensions, and biological response.

✍️ Conclusion
The best archwire sequence for extraction cases is one that follows the natural progression of orthodontic treatment. Starting with round NiTi wires for alignment, transitioning to rectangular NiTi wires for torque expression, and finishing with 0.019 × 0.025 stainless steel for space closure provides predictable biomechanics and excellent clinical control. Although minor variations exist among orthodontists, this sequence remains one of the most widely accepted approaches for achieving stable and efficient treatment outcomes.

📚 References

✔ Proffit, W. R., Fields, H. W., Larson, B. E., & Sarver, D. M. (2023). Contemporary Orthodontics (7th ed.). Elsevier.
✔ Graber, L. W., Vanarsdall, R. L., Vig, K. W. L., & Huang, G. J. (2022). Orthodontics: Current Principles and Techniques (7th ed.). Elsevier.
✔ Kusy, R. P. (2002). Orthodontic biomaterials: From the past to the present. The Angle Orthodontist, 72(6), 501–512.
✔ Burstone, C. J., & Goldberg, A. J. (1980). Beta titanium: A new orthodontic alloy. American Journal of Orthodontics, 77(2), 121–132.
✔ Krishnan, V., & Davidovitch, Z. (2006). Cellular, molecular, and tissue-level reactions to orthodontic force. American Journal of Orthodontics and Dentofacial Orthopedics, 129(4), 469.e1–469.e32.

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Heat-Activated NiTi vs Copper NiTi: Which Should You Choose?

Choosing the right orthodontic archwire is an important part of successful treatment. Among the most popular options, Heat-Activated Nickel-Titanium (NiTi) and Copper Nickel-Titanium (Copper NiTi) wires are widely used during the early alignment phase because they provide light, continuous forces that help move teeth efficiently while improving patient comfort.

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Although these wires may appear similar, they differ in temperature sensitivity, force delivery, flexibility, and clinical indications. Understanding these differences helps clinicians select the most appropriate wire for each stage of treatment and each patient's needs.

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🔹 What Are Heat-Activated NiTi Archwires?
Heat-Activated NiTi archwires are made from nickel-titanium alloys that become more active as they warm to body temperature.
At room temperature, the wire remains relatively flexible, making insertion easier. Once inside the mouth, body heat activates the wire, allowing it to deliver gentle, continuous orthodontic forces.

Main Advantages
▪️ Excellent flexibility during placement.
▪️ Low and continuous force reduces discomfort.
▪️ Suitable for severely crowded teeth.
▪️ Lower risk of excessive force on the periodontal tissues.
▪️ Good recovery after deformation due to shape memory.

Possible Limitations
▪️ Force delivery depends on oral temperature.
▪️ Less control over force levels compared with Copper NiTi.
▪️ Performance may vary slightly between manufacturers.

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🔹 What Are Copper NiTi Archwires?
Copper NiTi wires contain small amounts of copper, in addition to nickel and titanium.
Copper improves control over the wire's transformation temperature, allowing manufacturers to produce wires that activate at specific temperatures (for example, approximately 27°C, 35°C, or 40°C, depending on the product).
This provides a more predictable force system throughout treatment.

Main Advantages
▪️ More consistent force delivery.
▪️ Better control of activation temperature.
▪️ Improved superelastic behavior.
▪️ May provide greater patient comfort because forces remain gentle and controlled.
▪️ Useful when clinicians want greater precision during alignment.

Possible Limitations
▪️ Usually more expensive than conventional heat-activated NiTi.
▪️ Clinical advantages over modern heat-activated NiTi may be modest in many routine cases.
▪️ Availability varies by manufacturer.

🔹 Heat-Activated NiTi vs Copper NiTi

Feature	Heat-Activated NiTi	Copper NiTi
Activation	Body temperature	Specific transformation temperatures
Flexibility	Very high	Very high
Force Control	Good	Excellent
Patient Comfort	Excellent	Excellent to very good
Clinical Predictability	High	Higher
Cost	Lower	Higher
Early Alignment	Excellent	Excellent
Crowded Dentition	Excellent	Excellent
Temperature Sensitivity	Moderate	Precisely controlled

🔹 When Should You Choose Heat-Activated NiTi?
Heat-Activated NiTi is often the best choice when:

▪️ Initial alignment is the primary goal.
▪️ Moderate or severe crowding is present.
▪️ Easy wire insertion is desired.
▪️ Cost-effectiveness is important.
▪️ A reliable, versatile archwire is needed for routine orthodontic cases.

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🔹 When Should You Choose Copper NiTi?
Copper NiTi may be preferable when:

▪️ Highly controlled force delivery is desired.
▪️ The clinician wants greater consistency in wire activation.
▪️ Complex alignment requires predictable biomechanics.
▪️ Long treatment intervals are planned.
▪️ Maximum patient comfort is a priority.

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🔹 Does Copper NiTi Move Teeth Faster?
Current scientific evidence suggests that Copper NiTi does not consistently produce significantly faster tooth movement than modern heat-activated NiTi wires.
Instead, its primary advantage lies in delivering more controlled and predictable orthodontic forces, rather than increasing treatment speed.

Clinical outcomes depend on many additional factors, including:
▪️ Initial malocclusion.
▪️ Treatment mechanics.
▪️ Bracket system.
▪️ Patient cooperation.
▪️ Biological response.

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🔹 Clinical Considerations
Both wire types are excellent choices during the alignment and leveling phase.
Many orthodontists successfully complete early treatment using Heat-Activated NiTi, while others prefer Copper NiTi because of its improved force consistency.
In daily practice, the difference in treatment efficiency is often small, making clinician preference, experience, and treatment objectives important factors in wire selection.

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💬 Discussion
The comparison between Heat-Activated NiTi and Copper NiTi has been widely studied over the past decades. Laboratory studies consistently demonstrate that Copper NiTi offers better control of transformation temperatures and more predictable force release. However, clinical studies generally report similar alignment efficiency between the two wire types during routine orthodontic treatment.
This suggests that material properties alone do not determine clinical success. Proper diagnosis, treatment planning, and biomechanical control remain far more influential than the choice between these two high-quality archwire systems.

🎯 Recommendations
▪️ Heat-Activated NiTi is an excellent first-line option for most routine alignment cases.
▪️ Consider Copper NiTi when precise force control is particularly important.
▪️ Avoid applying excessive force during the alignment phase regardless of wire type.
▪️ Select wire dimensions according to crowding severity and treatment stage.
▪️ Follow manufacturer recommendations regarding activation temperatures.
▪️ Monitor patient comfort and periodontal health throughout treatment.

✍️ Conclusion
Both Heat-Activated NiTi and Copper NiTi are highly effective orthodontic archwires that produce light, biologically favorable forces during early treatment.
For most patients, Heat-Activated NiTi provides excellent clinical performance at a lower cost. Copper NiTi offers the advantage of greater force predictability and controlled temperature activation, making it especially valuable in cases requiring refined biomechanics.
Ultimately, the best choice depends on the patient's clinical needs, treatment objectives, and the orthodontist's preferred treatment mechanics rather than on expectations of faster tooth movement.

📚 References

✔ Burstone, C. J., & Qin, B. (1985). Chinese NiTi wire—A new orthodontic alloy. American Journal of Orthodontics, 87(6), 445–452.
✔ Kusy, R. P. (1997). A review of contemporary archwires: Their properties and characteristics. The Angle Orthodontist, 67(3), 197–207.
✔ Proffit, W. R., Fields, H. W., Larson, B., & Sarver, D. M. (2023). Contemporary Orthodontics (7th ed.). Elsevier.
✔ Santoro, M., Nicolay, O. F., & Cangialosi, T. J. (2001). Pseudoelasticity and thermoelasticity of nickel-titanium alloys: A clinically oriented review. Part I: Temperature transitional ranges. American Journal of Orthodontics and Dentofacial Orthopedics, 119(6), 587–593.
✔ Santoro, M., Nicolay, O. F., & Cangialosi, T. J. (2001). Pseudoelasticity and thermoelasticity of nickel-titanium alloys: A clinically oriented review. Part II: Deactivation forces. American Journal of Orthodontics and Dentofacial Orthopedics, 119(6), 594–603.
✔ Kapila, S., & Sachdeva, R. (1989). Mechanical properties and clinical applications of orthodontic wires. American Journal of Orthodontics and Dentofacial Orthopedics, 96(2), 100–109.

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