ĐẶC ĐIỂM TRÊN PHIM CBCT VỀ HÌNH THÁI VÀ VỊ TRÍ CỦA LỖ CẰM XƯƠNG HÀM DƯỚI Ở NGƯỜI TRƯỞNG THÀNH TỪ 18-30 TUỔI TẠI HÀ NỘI

Abstract

Objective: Determination of the position and morphology of the mental foramen and accessory mental foramina on CBCT images in adults aged 18–30 in Hanoi, 2025. Subject and methods: A cross-sectional description of 254 mandibular hemiarches from 127 CBCT scans. Results: The position aligned with the second premolar was observed in 57,48% of cases; the position between the two premolars accounted for 32,28%; alignment with the first premolar was found in 8,27%, and posterior to the second premolar in 1,97%. The round shape was found in 64,57% of cases; horizontally oval in 24,01%; vertically oval in 7,48%; and irregular in 3,94%. The prevalence of accessory mental foramen was 9,84%. Absence of the mental loop was observed in 90,16% of cases; a short mental loop (<2 mm) in 5,90%; and a long mental loop (>2 mm) in 3,94%. Conclusions: The most common position of the mental foramen was aligned with the second premolar and located inferior to the apex. The round shape was the most frequently observed form. Accessory mental foramina, when present, were typically not associated with a mental loop. No significant differences in the morphological characteristics or position of the mental foramen were found between genders or between the left and right sides of the mandible.