HỆ THỐNG ỐNG TUỶ CHÂN RĂNG NHÓM RĂNG HÀM NHỎ THỨ NHẤT TRÊN CONEBEAM CT

Abstract

Objective: To investigate the root canal system of the first premolars in Vietnamese individuals using ConeBeam CT scans. Subjects and Methods: The study was conducted on 25 extracted first premolars collected from Hanoi Medical University Hospital and the School of Dentistry, Hanoi Medical University (15 maxillary first premolars and 10 mandibular first premolars) between August 2023 and May 2024. Research   method   is   an experimental  study  without  control,  random  sample selection  according  to  the  criteria  until  the  number  of studies  is  sufficient. Results: Regarding the number of roots, the rate of single-rooted teeth in the maxillary first premolars group was 60%, higher than the double-rooted teeth (40%). In the mandibular first premolars group, 80% being single-rooted and 20% being double-rooted. In terms of the number of root canals, only one maxillary first premolar had a single root canal (6.7%), while the remaining teeth had two root canals (93.3%). This ratio was the same in the mandibular first premolars group. According to Vertucci's 1984 classification, the most common root canal morphology in maxillary first premolars was Type I (for single-rooted teeth) and Type V (for double-rooted teeth), and mostly Type I in mandibular first premolars. When examined on ConeBeam CT scans, the distance between the two root canals of the maxillary first premolar ranged from 2.98 ± 0.18 to 3.42 ± 0.39 mm, and this range was from 2.45 ± 0.37 to 3.58 ± 0.24 mm in the mandibular first premolars.