Clinical Effect of Micro-implant Compression of Maxillary Extended Molars by Cone-beam Computed Tomography and Three-dimensional Reconstruction Imaging Analysis

doi:10.13701/j.cnki.kqyxyj.2025.01.009

Abstract

Abstract: Objective: To investigate the clinical effect of micro-implant combined with segmental arch technique in intrusion of maxillary extended molars and the incidence of root resorption. Methods: Twenty-four patients with maxillary extended molars requiring intrusion were divided into groups A and B according to the first molar and second molar, with 12 patients in each group. Cone beam computed tomography (CBCT)was taken before treatment (T0) and after treatment (T1) to measure the pressure and root length change.CBCT combined with Mimics software(Materialise’s Interactive Medical Image Control System) was used to reconstruct the elongated molars before and after treatment.The reduction of tooth volume was calculated. Results: All the molars in group A and group B were effectively depressed, and the average depressions were (3.03±0.17) mm and (3.06±0.21) mm, respectively. The average root length reduction was (0.46±0.11) mm and (0.47±0.13) mm, respectively. The tooth volume loss was (57.60±3.79) mm³ and (57.10±3.85) mm³, respectively. The reduction of tooth surface area was (30.60±4.42) mm² and (32.38±3.04) mm², respectively. Teeth were significantly correlated with the amount of volume reduction and lower (P<0.05). Conclusion: Micro-implant combined with segmental arch intrusion is effective in the treatment of maxillary extended molars, but the intrusion is not absolute, which is partly caused by root resorption.

Key words: microimplant, segmental arch, molar intrusion, 3D reconstruction

LU Luyun, ZHANG Wei, CHEN Zhifang, YAN Weifeng. Clinical Effect of Micro-implant Compression of Maxillary Extended Molars by Cone-beam Computed Tomography and Three-dimensional Reconstruction Imaging Analysis[J]. Journal of Oral Science Research, 2025, 41(1): 45-49.

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