Deep bite correction requires more than simply leveling the curve of Spee. The appropriate biomechanics depend on the etiology of the deep bite, facial pattern, incisor display, periodontal condition, and desired vertical tooth movement.
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For patients in whom true anterior intrusion is indicated, the archwire sequence should progress from flexible alignment wires toward stiffer rectangular wires that permit increasingly precise three-dimensional control. However, there is no single archwire sequence that is universally superior for every deep-bite patient.
Importantly, evidence comparing complete archwire sequences specifically for deep-bite correction remains limited. Therefore, the following sequence should be considered an evidence-informed clinical framework, rather than a rigid protocol.
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A practical sequence for fixed-appliance treatment is:
| Treatment Phase | Suggested Archwire | Primary Objective |
|---|---|---|
| Initial Alignment | 0.012–0.014 in NiTi | Gentle alignment and leveling |
| Progressive Alignment | 0.016–0.018 in NiTi | Continue alignment and begin leveling |
| Early Rectangular Control | 0.016 × 0.022 or 0.017 × 0.025 in NiTi | Improve torque and vertical control |
| Deep-Bite Correction | Rectangular NiTi, TMA, or segmented intrusion arch | Intrusion and leveling according to diagnosis |
| Working Phase | 0.019 × 0.025 in stainless steel | Space closure and three-dimensional control |
| Finishing | 0.017 × 0.025 or 0.019 × 0.025 in stainless steel | Torque, detailing, and occlusal finishing |
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A 0.012–0.014-inch NiTi wire is appropriate when significant crowding or irregularity is present. A subsequent 0.016–0.018-inch NiTi wire can provide progressive alignment and leveling.
The objective at this stage is not to force rapid deep-bite correction. Excessive early leveling may produce unwanted incisor proclination or posterior effects before the clinician has established adequate anchorage.
Clinical trials evaluating archwire sequences have demonstrated that several commonly used sequences can achieve alignment, without establishing one universal sequence as clearly superior.
2. Rectangular NiTi: Transition to Three-Dimensional Control
Once sufficient alignment has been achieved, a rectangular NiTi archwire can be introduced. Common choices include 0.016 × 0.022-inch or 0.017 × 0.025-inch NiTi, depending on the appliance system.
This transition is important because deep-bite correction frequently requires greater control of incisor inclination and vertical position, rather than simple alignment.
3. Active Deep-Bite Correction
This is the critical phase. The wire selected should reflect the mechanism of correction, not simply the severity of the overbite.
When anterior intrusion is indicated, a segmented intrusion arch, three-piece arch, or skeletal anchorage-assisted mechanics may provide better control than relying exclusively on continuous archwire leveling.
Burstone emphasized that successful intrusion depends on appropriate force magnitude, force location relative to the center of resistance, posterior anchorage control, and minimizing unwanted posterior eruption.
True incisor intrusion is achievable, although the average amount is relatively modest. A systematic review reported approximately 1.46 mm of maxillary incisor intrusion and 1.90 mm of mandibular incisor intrusion with segmented mechanics.
4. TAD-Assisted Intrusion When Maximum Vertical Control Is Required
Temporary anchorage devices (TADs) can be particularly useful when posterior anchorage must be preserved or when substantial anterior intrusion is required.
Recent evidence indicates that TAD-supported mechanics may produce slightly greater incisor intrusion and deep-bite reduction than conventional intrusion mechanics. However, the magnitude of the difference is generally modest and the certainty of evidence remains limited.
Therefore, TADs should not be considered mandatory for every deep bite. They are most useful when the biomechanical objective cannot be achieved predictably with conventional anchorage.
5. Working and Finishing Wires
After the vertical relationship has been corrected, a 0.019 × 0.025-inch stainless steel archwire is commonly appropriate for the working phase.
This wire provides high control of torque, angulation, arch form, and space closure and is particularly useful when extraction mechanics are involved.
A smaller rectangular stainless-steel wire may be preferable during finishing when greater flexibility is desirable. Final wire selection should be based on the amount of detailing required rather than following a predetermined sequence.
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| Clinical Situation | Preferred Emphasis | Practical Approach |
|---|---|---|
| Deep bite with excessive incisor display | Anterior intrusion | Rectangular control + intrusion mechanics |
| Deep bite with low facial height in a growing patient | Posterior eruption/extrusion may be acceptable | Leveling or bite-opening mechanics |
| Deep bite with excessive lower-incisor proclination risk | Avoid uncontrolled leveling | Segmental mechanics and anchorage control |
| Deep bite with gummy smile | Maxillary incisor intrusion | Intrusion mechanics ± TADs |
| Extraction deep bite with retroclined incisors | Intrusion + controlled retraction | Three-piece or segmental mechanics |
| Adult deep bite requiring posterior anchorage preservation | Controlled anterior intrusion | TAD-supported or segmented mechanics |
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The concept of a "best" archwire sequence should therefore be interpreted as a biomechanical progression rather than a fixed series of wire dimensions.
A conventional sequence such as:
Round NiTi → Rectangular NiTi → Rectangular stainless steel
is adequate for many routine fixed-appliance cases. However, a patient with a clinically significant deep bite may require an additional vertical-control phase between rectangular NiTi and the final working archwire.
For example:
0.012–0.014 NiTi → 0.016 NiTi → 0.016 × 0.022 NiTi → intrusion mechanics → 0.019 × 0.025 stainless steel → finishing
may be more appropriate than attempting to correct the entire deep bite through progressive continuous-arch leveling.
Recent randomized evidence also suggests that reverse-curve mechanics can correct deep overbite but may influence lower-incisor proclination depending on wire design and torque. A 2025 randomized clinical study found comparable true intrusion among tested reverse-curve systems, while anterior crown torque substantially affected mandibular incisor proclination.
Consequently, wire selection should follow the intended tooth movement. The objective is not simply to use a larger archwire, but to generate the desired vertical and sagittal movements while controlling reciprocal effects.
🎯 Clinical Recommendations
1. Diagnose the source of the deep bite before selecting the archwire. Determine whether correction should primarily involve intrusion, extrusion, incisor inclination, or a combination.
2. Use flexible NiTi wires for initial alignment, but avoid relying on progressive continuous-arch leveling as the sole strategy when significant anterior intrusion is required.
3. Introduce rectangular control before active intrusion when incisor torque and root position need to be managed.
4. Consider segmented intrusion mechanics or TADs when posterior anchorage preservation is critical or when predictable anterior intrusion is the primary objective.
5. Use stainless steel rectangular wires for working and finishing control, particularly when space closure, torque expression, and detailed tooth positioning are required.
6. Do not equate overbite reduction with true intrusion. Evaluate the vertical changes of incisors and posterior teeth when treatment mechanics are being assessed.
✍️ Conclusion
The most appropriate archwire sequence for deep bite correction is individualized according to the vertical problem and the desired tooth movement. A practical sequence progresses from round NiTi alignment to rectangular NiTi control, dedicated intrusion mechanics when indicated, and rectangular stainless steel for working and finishing.
Current evidence supports the use of controlled intrusion mechanics, particularly when preservation of posterior anchorage is important. TAD-assisted intrusion may provide additional vertical control, although the available evidence does not justify considering it universally superior for every patient.
The key clinical principle is therefore biomechanical control rather than a predetermined wire sequence: the archwire should be selected according to the movement required to correct the patient's specific deep-bite phenotype.
📚 References
✔ Burstone, C. R. (1977). Deep overbite correction by intrusion. American Journal of Orthodontics, 72(1), 1–22. https://doi.org/10.1016/0002-9416(77)90121-X
✔ Weiland, F., Bantleon, H. P., & Droschl, H. (1992). The orthodontic treatment of deep bite in adults—a comparison of the straight wire appliance and the segmented arch technique. American Journal of Orthodontics and Dentofacial Orthopedics, 101(5), 403–410. https://doi.org/10.1016/0889-5406(92)70114-F
✔ Ng, J., Major, P. W., Heo, G., & Flores-Mir, C. (2005). True incisor intrusion attained during orthodontic treatment: A systematic review and meta-analysis. American Journal of Orthodontics and Dentofacial Orthopedics, 128(2), 212–219. https://doi.org/10.1016/j.ajodo.2004.04.025
✔ Mandall, N. A., Lowe, C., Worthington, H. V., Sandler, J., Derwent, S., Abdi-Oskouei, M., & Ward, S. (2006). Which orthodontic archwire sequence? A randomized clinical trial. European Journal of Orthodontics, 28(6), 561–566. https://doi.org/10.1093/ejo/cjl030
✔ Atalla, A. I., AboulFotouh, M. H., Fahim, F. H., & Foda, M. Y. (2020). Effectiveness of orthodontic mini-screw implants in adult deep bite patients during incisor intrusion: A systematic review. Contemporary Clinical Dentistry, 10(2), 372–381. https://doi.org/10.4103/ccd.ccd_618_18
✔ Sosly, R., Mohammed, H., & Riedy, C. A. (2020). Effectiveness of miniscrew-supported maxillary incisor intrusion in deep-bite correction: A systematic review and meta-analysis. The Angle Orthodontist, 90(2), 291–304.
✔ Bardideh, E., Tamizi, G., Shafaee, H., Rangrazi, A., Ghorbani, M., & Kerayechian, N. (2023). The effects of intrusion of anterior teeth by skeletal anchorage in deep bite patients: A systematic review and meta-analysis. Biomimetics, 8(1), 101. https://doi.org/10.3390/biomimetics8010101
✔ Lee, W. Y., Othman, S. A., & Sivarajan, S. (2026). Anterior intrusion mechanics for adult deep bite correction: A systematic review of randomised controlled trials. BMC Oral Health. https://doi.org/10.1186/s12903-026-09120-w
✔ Shakhtour, F., & Al-Nimri, K. (2025). Comparison between effects of reverse curve of Spee nickel titanium archwire and stainless steel archwires with and without torque on the lower incisors in deep overbite treatment: A randomized control study. The Angle Orthodontist, 95(1), 27–34. https://doi.org/10.2319/051524-376.1
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