A Microcomputed Tomographic Study of Canal Isthmuses in the Mesial Root of Mandibular First Molars in a Chinese Population

作者：Gu Lisha; Wei Xi; Ling Junqi^*; Huang Xiangya

来源：Journal of Endodontics, 2009, 35(3): 353-356.

DOI：10.1016/j.joen.2008.11.029

• Canal anatomy
• isthmus
• mandibular first molar
• microcomputed tomography
• three-dimensional morphology

Untreated isthmuses can be a cause of endodontic treatment failure. We investigated the anatomic features of the isthmus in the mesial root of mandibular first molars using microcomputed tomography scans. Thirty-six extracted mandibular first molars were collected from the Chinese population and divided into three age groups as follows: 20 to 39 years (group A), 40 to 59 years (group B),and >= 60 years (group C). Each tooth was scanned and reconstructed, and then the prevalence and type of isthmus were recorded. The percentage of sections showing isthmuses for groups A, B, and C were 50%, 41 %, and 24%, respectively. The chi-square test indicated a significant correlation of the distribution of isthmuses with age (p < 0.001). The ratio of partial isthmus to complete isthmus for group C (17.1:1) was significantly higher than group A (5.9:1) and group B (7.0:1) (p < 0.001). By understanding the configuration and location of isthmus, a more efficient endodontic microsurgery can be guaranteed. (J Endod 2009,35: 353-356)

• 出版日期2009-3
• 单位中山大学