The orthodontic management of an impacted canine requires more than simply creating space and applying traction. The archwire system must provide adequate alignment, anchorage, torque control, and stabilization while allowing the impacted tooth to be guided through a controlled path into the dental arch.
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Poorly controlled mechanics may increase the risk of root resorption, periodontal complications, and unwanted movement of adjacent teeth.
Although different archwire sequences can be clinically effective, a practical fixed-appliance protocol generally progresses from light flexible NiTi wires to rectangular working wires and finally rigid stainless-steel wires. The objective is to establish a sufficiently stable dental arch before significant canine traction is initiated.
1. Initial Alignment and Leveling
The initial phase should focus on correcting rotations, leveling the arch, and establishing sufficient space for the impacted canine.
A commonly used sequence is:
▪️ 0.012–0.014-inch NiTi: initial alignment in moderately irregular arches.
▪️ 0.016-inch NiTi: continued leveling and alignment.
▪️ 0.016 × 0.022-inch or 0.017 × 0.025-inch NiTi: transition to rectangular control.
▪️ 0.019 × 0.025-inch NiTi: development of greater three-dimensional control before the working phase.
The exact sequence should not be considered mandatory. Evidence comparing conventional archwire sequences indicates that different combinations can achieve comparable alignment, supporting individualized selection according to the severity of malalignment and the treatment objectives.
For an impacted canine, however, rapid progression to a rigid rectangular working wire should be avoided if the adjacent teeth are not adequately aligned or if the required space has not been established.
2. Space Creation Before Canine Traction
Before orthodontic traction, the clinician should confirm:
1. Adequate space for the canine crown and root.
2. Correct axial position of the adjacent teeth.
3. Sufficient anchorage for the planned direction of traction.
4. Absence of significant interference with adjacent roots.
5. A clinically appropriate path of eruption.
Radiographic or CBCT assessment may be particularly valuable in complex impactions because three-dimensional localization influences the direction of traction and helps reduce the risk of undesirable contact with adjacent roots.
Canine traction should not be used as a substitute for inadequate space management.
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One of the most important stages is establishing a rigid and stable archwire before applying substantial traction to the impacted canine.
A practical stabilization sequence can be summarized as follows:
| Stage | Typical Archwire | Main Purpose |
|---|---|---|
| Initial alignment | 0.012–0.014 NiTi | Gentle alignment |
| Leveling | 0.016 NiTi | Leveling and continued alignment |
| Rectangular control | 0.016 × 0.022 or 0.017 × 0.025 NiTi | Torque and root-position control |
| Pre-traction working phase | 0.019 × 0.025 NiTi or equivalent | Arch coordination and control |
| Stabilization | 0.019 × 0.025 stainless steel | Anchorage and three-dimensional stabilization |
4. Why Stainless Steel Is Important During Canine Traction
During traction of an impacted canine, the objective is not simply to move the canine toward the arch. The surrounding teeth must remain sufficiently stable while the force system directs the impacted tooth along a controlled path.
A rigid rectangular stainless-steel base archwire can therefore be used to:
▪️ Limit unwanted tipping of adjacent teeth.
▪️ Improve control of incisor torque.
▪️ Reinforce posterior anchorage.
▪️ Provide a stable platform for auxiliary traction mechanics.
▪️ Reduce unwanted deformation of the main archwire.
For difficult impactions, sectional mechanics or cantilever systems may be preferable to applying traction directly to a flexible continuous archwire. Contemporary literature also describes the use of sectional wires and cantilevers, particularly when additional anchorage is required.
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The traction phase should be considered separately from conventional alignment.
A useful clinical concept is:
Rigid base archwire + controlled auxiliary force + appropriate anchorage
Rather than repeatedly changing the main archwire to accommodate the impacted canine, the clinician can maintain a stable rectangular working archwire and use an auxiliary system such as:
▪️ TMA cantilever
▪️ Stainless-steel auxiliary
▪️ Sectional archwire
▪️ Elastic traction from a controlled attachment
▪️ Temporary anchorage device (TAD), when conventional anchorage is insufficient
The choice depends primarily on the three-dimensional position of the canine, rather than on the archwire sequence itself.
Recent evidence indicates that auxiliary mechanics, including TADs and sectional/cantilever systems, can be important in complex impacted-canine treatment.
6. Stabilization During Space Closure and Canine Integration
Once the canine has been brought sufficiently close to the arch, the main archwire should continue to provide control while the tooth is progressively integrated into the arch.
A typical sequence may therefore be:
0.019 × 0.025 SS → canine integration → finishing adjustments
The rigid stainless-steel wire can remain in place while the canine is progressively aligned, provided that the required movements do not exceed the wire's ability to accommodate them.
If significant finishing corrections are necessary after canine engagement, a 0.017 × 0.025-inch or 0.019 × 0.025-inch TMA wire may provide greater flexibility than stainless steel while retaining useful rectangular control.
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For a conventional fixed-appliance case involving a maxillary impacted canine, an evidence-informed clinical sequence can be summarized as:
| Phase | Suggested Wire | Clinical Objective |
|---|---|---|
| 1. Alignment | 0.012–0.014 NiTi | Initial alignment |
| 2. Leveling | 0.016 NiTi | Leveling and alignment |
| 3. Rectangular alignment | 0.016 × 0.022 or 0.017 × 0.025 NiTi | Root and torque control |
| 4. Working phase | 0.019 × 0.025 NiTi | Arch coordination and control |
| 5. Stabilization | 0.019 × 0.025 SS | Stable base for canine traction |
| 6. Traction | SS base + TMA/sectional auxiliary | Controlled canine movement |
| 7. Finishing | 0.017 × 0.025 or 0.019 × 0.025 TMA/SS | Final root and occlusal control |
💬 Discussion
The principal biomechanical issue in impacted canine treatment is not the number of archwires used but the transition from a flexible alignment system to a sufficiently rigid system capable of controlling the erupted dentition during traction.
Current evidence supports individualized treatment planning based on the canine's three-dimensional position and severity of impaction.
Importantly, successful alignment does not necessarily mean absence of periodontal consequences. A systematic review and meta-analysis found that orthodontically aligned impacted maxillary canines may present modest increases in probing depth, clinical attachment loss, bone loss, and other periodontal differences compared with the contralateral non-impacted canine. However, the certainty of evidence was low to very low.
Therefore, rigid stabilization should facilitate controlled traction rather than justify excessive force. The objective is to move the canine through a biologically and mechanically appropriate path while minimizing unwanted movement of adjacent teeth.
✍️ Conclusion
An effective archwire sequence for impacted canines should progressively establish alignment, rectangular control, and finally a rigid anchorage platform before significant traction is applied.
A practical sequence is light NiTi → rectangular NiTi → 0.019 × 0.025 NiTi → 0.019 × 0.025 stainless steel, followed by controlled traction using a suitable auxiliary system. For complex impactions, sectional wires, cantilevers, or TAD-supported mechanics may provide superior control.
The 0.019 × 0.025-inch stainless-steel archwire is particularly useful as a stabilization wire because it provides a rigid base from which canine traction can be delivered while limiting unwanted movement of the remaining dentition.
🎯 Clinical Recommendations
▪️ Do not initiate substantial canine traction until adequate space and anchorage have been established.
▪️ Use a rigid rectangular stainless-steel base archwire when significant stabilization is required.
▪️ Select the direction of traction according to the three-dimensional canine position, rather than according to a predetermined archwire sequence.
▪️ Consider cantilever, sectional, or TAD-supported mechanics when conventional continuous-arch traction would generate undesirable reciprocal effects.
▪️ Monitor adjacent roots and periodontal tissues throughout treatment, particularly in severely displaced canines.
📚 References
✔ Aquino-Valverde, A. J., et al. (2021). Orthodontic treatment in impacted maxillary canines: A review of the literature. Revista Científica Odontológica, 9(4), e085. https://doi.org/10.21142/2523-2754-0904-2021-085
✔ Bishara, S. E. (1992). Impacted maxillary canines: A review. American Journal of Orthodontics and Dentofacial Orthopedics, 101(2), 159–171. https://doi.org/10.1016/0889-5406(92)70008-X
✔ Grisar, K., Denoiseux, B., Martin, C., Hoppenreijs, T., Calburean, F., Politis, C., & Jacobs, R. (2022). Treatment for critically impacted maxillary canines: Clinical versus scientific evidence—A systematic review. Journal of Stomatology, Oral and Maxillofacial Surgery, 123(3), e12–e19. https://doi.org/10.1016/j.jormas.2021.03.013
✔ 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
✔ Seehra, J., Alshammari, A., Wazwaz, F., Papageorgiou, S. N., Newton, J. T., & Cobourne, M. T. (2023). Periodontal outcomes associated with impacted maxillary central incisor and canine teeth following surgical exposure and orthodontic alignment: A systematic review and meta-analysis. European Journal of Orthodontics, 45(5), 584–598. https://doi.org/10.1093/ejo/cjad039
✔ Tarkan, H., & Gürbüz, O. Ö. (2026). The impact of orthodontic traction on outcomes in impacted canine management: A quantitative analysis. The Angle Orthodontist, 96(2), 181–191. https://doi.org/10.2319/032125-227.1
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