A micro-computed tomographic study of the isthmus in the root canal system of mandibular first molar.
- Author:
Li-Sha GU
1
;
Jun-Qi LING
;
Xiang-Ya HUANG
;
Xi WEI
;
Qiong XU
Author Information
- Publication Type:Journal Article
- MeSH: Adult; Dental Pulp Cavity; diagnostic imaging; Humans; Imaging, Three-Dimensional; Mandible; diagnostic imaging; Molar; diagnostic imaging; Root Canal Therapy; Tooth Root; diagnostic imaging; X-Ray Microtomography
- From: Chinese Journal of Stomatology 2009;44(1):11-14
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo investigate the prevalence and configuration of the isthmuses in the apical 6 mm of the mesial and distal roots of Chinese mandibular first molar by means of micro-computed tomography.
METHODSThirty-six extracted human mandibular first molars were selected. Specimens were subject to micro-CT and a slice thickness of 30 microm was obtained in the apical 6 mm of the roots examined. The number of sections showing isthmuses at each apical level was recorded. Three-dimensional images of isthmuses of mandibular first molars were reconstructed and observed.
RESULTSThe mesial roots of human mandibular first molars had a high incidence of isthmus. The isthmus incidence was greatest 4-6 mm from the apex in human mandibular first molar, with prevalence figures of 49.5%-66.1% and 17.3%-17.8% in mesial and distal roots, respectively. The chi-square test indicated a significant difference in the distribution of isthmuses between the two roots (P < 0.01).
CONCLUSIONSThe mesial roots of human mandibular first molars have a high incidence of isthmus, which may have clinical implications especially when surgical endodontics is performed on the mesial roots of mandibular molars.