فهرست نشریات علمی دسترسی آزاد ایران

AimTo evaluate stress distribution and displacement patterns during infrazygomatic crest (IZC)–supported full‑arch distalization with intrusion and to compare the biomechanical performance of single versus dual anterior temporary anchorage device (TAD) configurations using finite element analysis.Methods A CBCT‑based three‑dimensional finite element model of the maxillary dentoalveolar complex was constructed, including teeth, periodontal ligament (PDL), cortical and cancellous bone, archwire, IZC screws, and TADs. Two anchorage configurations were simulated: a single anterior TAD placed between the maxillary central incisors and dual anterior TADs placed bilaterally between the central and lateral incisors, both combined with IZC screws. Distalization forces ranging from 50 to 700 g were applied with a constant intrusive force of 50 g. Von Mises stress distribution and displacement patterns were evaluated in the cortical bone, PDL, dental roots, and anchorage components.ResultsFourteen loading conditions (50–700 g distalization combined with 50 g intrusion) were analyzed. At low force levels (50–250 g), stresses remained within physiologic limits, with root stress ranging from 1.40 to 1.80 MPa and PDL stress from 0.015 to 0.020 MPa. With moderate forces (300–475 g), stresses increased, and root stress reached 2.88–3.03 MPa while PDL stress ranged from 0.026 to 0.030 MPa. At higher forces (500–700 g), stress levels further increased, with root stress ranging from 4.18 to 4.38 MPa and PDL stress from 0.041 to 0.044 MPa, indicating a potential overload region. Overall, stress and displacement values increased proportionally with increasing distalization force. The dual TAD configuration consistently demonstrated more favorable biomechanical behavior than the single‑TAD model, showing lower stress concentrations in cortical bone and the periodontal ligament, more uniform stress distribution, and reduced displacement of the maxillary teeth.ConclusionDual anterior TAD reinforcement during IZC-supported full-arch distalization with intrusion demonstrated a more uniform stress distribution and lower displacement values compared with the single TAD configuration, suggesting differences in biomechanical behavior between the two anchorage systems. Careful regulation of distalization force magnitude may help minimize localized stress within the dentoalveolar structures during skeletal anchorage–supported maxillary distalization.