A micro-computed tomographic study of the isthmus in the root canal system of mandibular first molar
10.3760/cma.j.issn.1002-0098.2009.01.004
- VernacularTitle:成人下颌第一磨牙管间峡区的显微CT观察
- Author:
Li-Sha GU
1
;
Jun-Qi LING
;
Xiang-Ya HUANG
;
Xi WEI
;
Qiong XU
Author Information
1. 中山大学光华口腔医学院
- Keywords:
Molar;
Root canal therapy;
Microscopy,electron,scanning;
Isthmus
- From:
Chinese Journal of Stomatology
2009;44(1):11-14
- CountryChina
- Language:Chinese
-
Abstract:
Objective To 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 tomograpby.Methods Thirty-six extracted human mandibular first molars were selected.Specimens were subject to micro-CT and a slice thickness of 30 μm 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.Results The 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).Conclusions The 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.
