KÍCH THƯỚC XƯƠNG Ổ RĂNG HÀM TRÊN Ở BỆNH NHÂN SAI KHỚP CẮN HẠNG II TRÊN PHIM CTCB

Abstract

A cross-sectional study was conducted on 25 patients who had never undergone orthodontic treatment and were diagnosed with class II malocclusion and were examined, treated, and had CTCB images taken at School of Odonto-Stomatology, Hanoi Medical University from March 2023 to July 2024 to determine the thickness and width of the interdental bone between the maxillary  teeth and to find on some favorable positions for miniscrew placement in this patients. The results showed that the average alveolar bone width of the buccal surface of the maxillary dental arch was largest in the central incisor region at a position 8mm from the CEJ (3.66 ± 0.82 mm), followed by the region between second premolar and first molar (3.43 ± 1mm), the palatal surface was largest in the region between first molar and second molar (5.79 ± 1.12 mm). Conclusion: favorable positions for miniscrew placement in maxillary arch are central incisors, between second premolar and first molarin buccal surface, between first molar and second molar in palatal surface. Due to the limited alveolar bone width, the recommended diameter of the minivis is 1.2-1.6mm for placement in the alveolar bone and the recommended length is 6-8mm.