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Open Access Research article

Cone-beam computed tomography study of root and canal morphology of mandibular premolars in a western Chinese population

Xuan Yu14, Bin Guo2, Ke-Zeng Li1, Ru Zhang1, Yuan-Yuan Tian1, Hu Wang3* and Tao Hu DDS1*

Author Affiliations

1 State Key Laboratory of Oral Diseases, Departments of Operative Dentistry and Endodontics, West China School of Stomatology, Sichuan University, Chengdu, P.R. China

2 Institute of Stomatology of Chinese PLA General Hospital, Beijing, P.R. China

3 Department of Radiology, West China School of Stomatology, Sichuan University, Chengdu, China

4 Department of Stomatology, Yinzhou People's Hospital, Ningbo, Zhejiang, P.R.China

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BMC Medical Imaging 2012, 12:18  doi:10.1186/1471-2342-12-18

Published: 20 July 2012

Abstract

Background

Traditional radiography is limited in its ability to give reliable information on the number and morphology of root canals. The application of cone-beam computed tomography (CBCT) provides a non-invasive three-dimensional confirmatory diagnosis as a complement to conventional radiography. The aim of this study was to evaluate the root and canal morphology of mandibular premolars in a western Chinese population using CBCT scanning.

Methods

The sample included 149 CBCT images comprising 178 mandibular first premolars and 178 second premolars. The tooth position, number of roots and canals, and canal configuration according to Vertucci’s classification were recorded.

Results

The results showed that 98% of mandibular first premolars had one root and 2% had two roots; 87.1% had one canal, 11.2% had two canals and 0.6% had three canals. The prevalence of C-shaped canals was 1.1%. All mandibular second premolars had one root; 97.2% had one canal and 2.2% had two canals. The prevalence of C-shaped canals was 0.6%.

Conclusions

The prevalence of multiple canals in mandibular first premolars was mainly of Type V, and mandibular second premolars had a low rate of canal variation in this western Chinese population. Root canal bifurcation occurred at the middle or apical third in most bicanal mandibular premolars. CBCT scanning can be used in the management of mandibular premolars with complex canal morphology.

Keywords:
Cone-beam computed tomography; Mandibular premolar; Morphology; Root canal configuration