ORIGINAL ARTICLE - The incidence and types of C-shaped canal of permanent mandibular second molar in Korean sub-population: Cone-Beam CT data analysis

Moon,  Jung-Bon; Jang,  Ju-Kyong; Son,  Sung-Ae; Park,  Bong-Soo; Lee,  Hyo-Jin; Kim,  Hyeon-Cheol

J Korean Dent Assoc > Volume 50(4); 2012 > Article

The Journal of The Korean Dental Association 2012;50(4):203-210.
Published online April 30, 2012.

한국인의 영구 하악 제2대구치의 C형 근관 빈도와 형태 : Cone-Beam CT 자료 분석

문정본¹, 장주경², 손성애³, 이효진⁴, 박봉수⁵, 김현철⁶

^¹부산대학교 치의학전문대학원 구강해부학교실
^²부산대학교 치의학전문대학원 치과보존학교실
^³부산대학교 치의학전문대학원 치과보존학교실
^⁴부산대학교 통계학과
^⁵부산대학교 치의학전문대학원 구강해부학교실
^⁶부산대학교 치의학전문대학원 치과보존학교실

ORIGINAL ARTICLE - The incidence and types of C-shaped canal of permanent mandibular second molar in Korean sub-population: Cone-Beam CT data analysis

Jung-Bon Moon¹, Ju-Kyong Jang², Sung-Ae Son³, Bong-Soo Park⁴, Hyo-Jin Lee⁵, Hyeon-Cheol Kim⁶

¹Dept. of Oral Anatomy, School of Dentistry, Pusan National University
²Department of Conservative Dentistry, School of Dentistry, Pusan National University
³Department of Conservative Dentistry, School of Dentistry, Pusan National University
⁴Department of Statistics, Pusan National University
⁵Dept. of Oral Anatomy, School of Dentistry, Pusan National University
⁶Department of Conservative Dentistry, School of Dentistry, Pusan National University

Abstract

Objective
The aim of this study was to investigate the incidence of the C-shaped canal of permanent mandibular second molar (PMSM) in Korean sub-population using Cone-Beam CT (CBCT) data and analyze the types of C-shaped canal. Materials & Methods: The protocol for this study was approved by the Institutional Review Board at the Pusan National University Hospital (E-2011039). Among the CBCT images taken of patients who visited the St. Bennedict Dental Hospital (Busan, Korea) from May 2008 to April 2011 for implant surgery and surgical removal of impacted teeth, high-quality CBCTs from 705 patients (361 male and 342 female) were screened and 607 PMSMs of 383 patients were evaluated retrospectively. All PMSMs were anatomically analyzed in detail by using image viewer software (EasyDent; Vatech). PMSMs were evaluated in the axial plane to investigate the shape of root and canals. The C-shaped canals were classified into five types. The total incidence, gender ratio, bilateral and unilateral appearance. and the correlation between right-side and left-side occurrences of C-shaped PMSMs were computed and compared statistically using the chi-square test. Results: Among the 607 PMSMs of 383 CBCTs of 187 females and 196 males, 198 PMSMs(32.6%) had C-shaped root and 158 PMSMs(26.0%) had C-shaped canals. The shape of C-shaped root canals at the furcalion level did not have significant change at the level of mid root (P<0.0001). Female had more prevalence of C-shaped root canals than male (P<0.0001). The prevalence of bilateral occurrence of C-shaped root canals was higher than unilateral occurrence. Conclusions: The occurrence of C-shaped PMSMs among a Korean population was 32.6% and was higher than other countries and ethnicities. Understanding the prevalence of PMSMs with a C-shaped root and/or canal in a Korean population may be useful for successful endodontic treatments.

Key Words: C-shaped canal;C-shaped root;mandibular second molar;Cone-Beam CT;Korean;