Orthodontic treatment is frequently associated with pain and discomfort due to inflammatory responses following force application. The selection of appropriate analgesics in orthodontics is critical, as certain drugs may interfere with bone remodeling and tooth movement.
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✅ Introduction
Orthodontic pain typically arises within hours after appliance activation and may persist for several days. It is mediated by prostaglandin release and periodontal ligament inflammation, both essential for orthodontic tooth movement. Therefore, analgesic selection must ensure effective pain control without compromising treatment efficiency.
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Orthodontic forces induce localized ischemia and inflammation, leading to the release of mediators such as prostaglandins (PGE2). These molecules are essential for osteoclastic activity and bone remodeling, which enable tooth displacement.
✅ Analgesics in Orthodontics
1. Paracetamol (Acetaminophen)
▪️ Mechanism: central inhibition of prostaglandin synthesis
▪️ Dosage (adults): 500–1000 mg every 6–8 hours (max 4 g/day)
Clinical considerations:
▪️ Minimal effect on peripheral inflammation
▪️ Safe profile when used within recommended doses
▪️ Low risk of interfering with orthodontic mechanics
Justification:
Paracetamol is the first-line analgesic in orthodontics because it provides effective pain relief while preserving prostaglandin-mediated bone remodeling, ensuring normal tooth movement.
2. Non-Steroidal Anti-Inflammatory Drugs (NSAIDs)
Examples: Ibuprofen, Naproxen
▪️ Mechanism: cyclooxygenase (COX) inhibition → decreased prostaglandins
▪️ Dosage (Ibuprofen): 400–600 mg every 6–8 hours (max 2400 mg/day)
Clinical considerations:
▪️ Effective anti-inflammatory and analgesic action
▪️ May reduce inflammation required for tooth movement
▪️ Effects depend on dose and duration
Justification:
NSAIDs provide strong analgesia; however, their inhibition of prostaglandins may reduce the rate of orthodontic tooth movement, especially with repeated or prolonged use.
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▪️ Potent NSAID with strong anti-inflammatory and analgesic effects
▪️ Mechanism: non-selective COX inhibition, significantly reducing prostaglandin synthesis
▪️ Dosage (adults): 50 mg every 8–12 hours (max 150 mg/day)
Clinical considerations:
▪️ Significant suppression of prostaglandin production
▪️ Greater potential impact on bone remodeling compared to other NSAIDs
▪️ Not recommended for prolonged use during active orthodontic phases
Justification:
Although effective for pain control, diclofenac may significantly interfere with PGE2-mediated bone remodeling, potentially slowing orthodontic tooth movement and prolonging treatment time.
4. Aspirin (Acetylsalicylic Acid)
▪️ Mechanism: irreversible COX inhibition
▪️ Dosage (adults): 500–1000 mg every 6–8 hours
Clinical considerations:
▪️ Antiplatelet effect increases bleeding risk
▪️ Alters inflammatory pathways essential for tooth movement
Justification:
Aspirin is not recommended in orthodontic patients due to its interference with bone remodeling and increased bleeding tendency, which may complicate clinical management.
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Examples: Celecoxib
▪️ Mechanism: selective inhibition of COX-2
▪️ Dosage (Celecoxib): 100–200 mg every 12–24 hours
Clinical considerations:
▪️ Reduced gastrointestinal side effects
▪️ Limited evidence in orthodontics
▪️ Potential effects on bone metabolism remain unclear
Justification:
Although COX-2 inhibitors offer analgesia with fewer gastrointestinal effects, their influence on orthodontic tooth movement is not fully established, requiring cautious use.
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The choice of analgesics in orthodontics must consider their biological effects on prostaglandin synthesis and bone remodeling. NSAIDs, particularly diclofenac, exhibit a strong inhibitory effect, which may compromise treatment efficiency. In contrast, paracetamol provides effective analgesia without altering orthodontic biomechanics, making it the preferred option.
✍️ Conclusion
Paracetamol remains the most recommended analgesic in orthodontics, due to its efficacy and minimal interference with tooth movement. NSAIDs, especially diclofenac, should be used cautiously to avoid delays in orthodontic treatment progression.
🎯 Recommendations
▪️ Use paracetamol as first-line therapy
▪️ Avoid frequent or prolonged NSAID use, especially diclofenac
▪️ Prescribe the lowest effective dose
▪️ Evaluate systemic conditions before analgesic selection
▪️ Inform patients about pain expectations and safe medication use
📚 References
✔ Krishnan, V. (2007). Orthodontic pain: from causes to management—a review. European Journal of Orthodontics, 29(2), 170–179. https://doi.org/10.1093/ejo/cjl081
✔ Kehoe, M. J., Cohen, S. M., Zarrinnia, K., & Cowan, A. (1996). The effect of acetaminophen, ibuprofen, and misoprostol on prostaglandin E2 synthesis and orthodontic tooth movement. American Journal of Orthodontics and Dentofacial Orthopedics, 110(2), 132–139. https://doi.org/10.1016/S0889-5406(96)70090-7
✔ Polat, O., & Karaman, A. I. (2005). Pain control during fixed orthodontic appliance therapy. Angle Orthodontist, 75(2), 214–219. https://doi.org/10.1043/0003-3219(2005)075 <0214:pcdofa>2.0.CO;2
✔ Arias, O. R., & Marquez-Orozco, M. C. (2006). Aspirin, acetaminophen, and ibuprofen: their effects on orthodontic tooth movement. American Journal of Orthodontics and Dentofacial Orthopedics, 130(3), 364–370. https://doi.org/10.1016/j.ajodo.2005.01.020
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