콘빔전산화단층영상을 활용한 한국인 하악 소구치의 근관 및 치근 형태의 후향적 연구

Abstract

The aim of this study was to investigate canal morphology and analyze the radicular groove on mandibular premolars using cone-beam computed tomography (CBCT) images in large Korean population. CBCT scans including mandibular premolars for the purpose of dental planning and treatment was selected to evaluate the root canal morphology. The canal anatomy of premolar was evaluated in three different directions of image slides. Mandibular premolars were categorized into five types according to the classification of Vertucci et al. In addition, the presence and location of radicular groove were evaluated. The location of groove was assessed as buccal, lingual, mesial, and distal in horizontally and upper and lower in vertically. The prevalence of radicular groove was analyzed by sex and tooth. Total of 496 patients (271 males, 225 females, average age: 38.74 years) with 992 first and 987 second premolars were evaluated. In canal morphology analysis, the most frequent type, type Ⅰ was accounted for 89.3% and 99.5% on first and second premolars, respectively. In first premolars, type Ⅴ and Ⅲ were followed at 6.5% and 3.7%, separately. In second premolars, type Ⅲ and Ⅴ were followed at 0.3% and 0.2 %. Radicular grooves were significantly more presented in the first premolar (10.3%) than in the second premolar (0.5%). Radicular groove of the first molar was 2.4 times more frequent in male patient compared to female patient with significance. Both first and second premolars, radicular grooves were most commonly detected on the mesial and the lower area. Clinicians should consider the possibility of anatomical variations of canal and root morphology, including radicular groove in the mandibular premolar, especially the mandibular first premolar root canal treatment, periodontal treatment. Information on these anatomical variations will play a key role in successful non-surgical endodontic treatment.