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Research Article

Root Canal Isthmi and Associated Radicular Grooves in Mandibular First Premolars using Micro-computed Tomography

Junhong Chen, Xiangjie Li, Yang Su, Dan Zhang, Ling Li, Jia Luo, Xiujie Wen, Luchuan Liu, Jianping An, Manjing Deng

Correspondence Address :

Dr. Manjing Deng
DDS, MDS, PhD, Associate Professor and Director, Stomatology Department
The Third military Medical University
10# Changjiangzhilu, Daping, Yuzhong District 400042, Chongqing, P.R.China
Tel: (86- 23) 68757575, Fax: (86-23) 63322357
Email: iradeng@163.com

Received on: August 15, 2015, Accepted on: August 31, 2015, Published on: September 04, 2015

Citation: Junhong Chen, Xiangjie Li, Yang Su, Dan Zhang, Ling Li, Jia Luo, Xiujie Wen, Luchuan Liu, Jianping An, Manjing Deng (2015). Root Canal Isthmi and Associated Radicular Grooves in Mandibular First Premolars using Micro-computed Tomography

Copyright: 2015 Manjing Deng, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

  • Abstract

Abstract
Introduction: This study aimed to investigate the anatomical features of root canal isthmi in mandibular first premolars with radicular grooves and determine the correlation between radicular groove depth and isthmus wall thickness and shape using microcomputed tomography.
Methods: Fifty-two mandibular first premolars with mesial radicular grooves were scanned using micro-computed tomography. The wall thickness in different parts of the detected isthmi was measured using Mimics 10.01 software and the isthmus shapes were quantified by the form factor. The correlation of these two parameters with groove depth was analyzed.
Results: Twenty-three teeth had isthmi located within approximately one-fifth of (2.36 +/- 1.76 mm) the root lengths. All isthmi were located within the scope of the radicular grooves. The mean minimum wall thickness was significantly lesser for the mesial than for the distal wall. A significant negative correlation was observed between the minimum mesial wall thickness and groove depth. The mean form factor ranged from 0.31 to 0.78 and correlated negatively with the groove depth.
Conclusions: Our results suggested that the highest incidence of isthmi is observed between 4.93 and 7.29 mm from the apex in mandibular first premolars with radicular grooves. The isthmus wall thickness and shape in the radicular groove region can vary, presenting anatomical considerations for endodontic and prosthetic treatment.