Aim: To evaluate the biomechanical effects of four different auxiliary-aligner combinations for the extrusion of a maxillary central incisor and to define the most effective design through finite element analysis (FEA).
Materials And Methods: A full maxillary arch (14 teeth) was modelled by combining two different imaging techniques: cone beam computed tomography and surface-structured light scan. The appliance and auxiliary element geometries were created by exploiting computer-aided design (CAD) procedures. The reconstructed digital models were imported within the finite element solver (Ansys® 17). For the extrusion movement, the authors compared the aligner without an attachment with three auxiliary-aligner designs: a rectangular palatal attachment, a rectangular buccal attachment, and an ellipsoid buccal attachment. The resulting force-moment (MF) system delivered by the aligner to the target tooth and the tooth displacement were calculated for each scenario.
Results: The maximum tooth displacement along the axis (0.07 mm) was obtained with the rectangular palatal attachment, while the minimum (0.02 mm) was obtained without any attachments. With the ellipsoid attachment, the highest undesired moments and were found. The rectangular palatal attachment showed the highest (2.0 N) with the lowest undesired forces ( = 0.4 N; = -0.2 N).
Conclusions: FEA demonstrated that the rectangular palatal attachment can improve the effectiveness of the appliance for the extrusion of an upper central incisor.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6702849 | PMC |
| http://dx.doi.org/10.1155/2019/9687127 | DOI Listing |
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Article Synopsis
- This study evaluated how different attachments (auxiliaries) affect tooth movement and stress when using clear aligners to torque maxillary central incisors by 1°.
- Five models were tested: no auxiliaries (control), power ridge, semi-ellipsoid attachment, horizontal rectangular attachment, and horizontal cylinder attachment.
- The semi-ellipsoid attachment provided better stress distribution, while the power ridge offered better root control but caused a twist in the teeth.
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