JOURNAL OF SHANDONG UNIVERSITY (HEALTH SCIENCES) ›› 2014, Vol. 52 ›› Issue (9): 85-89.doi: 10.6040/j.issn.1671-7554.0.2014.030

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Anatomy of the root canal system of mandibular first premolar in population of Shandong Province

SHAO Haigang1, WANG Xuan2, WANG Qing2   

  1. 1. Yida Dental Clinic, Jinan 250001, Shandong, China;
    2. Department of Endodontics, Stomatological Hospital, Shandong University, Shandong Provincial Key Laboratory of Oral Biomedicine, Jinan 250012, Shandong, China
  • Received:2014-01-13 Revised:2014-09-05 Online:2014-09-10 Published:2014-09-10
  • Contact: 王青。E-mail:wangqing@sdu.edu.cn E-mail:wangqing@sdu.edu.cn

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Abstract: Objective To study the anatomical features of root canal system of mandibular first premolar in Shandong Province. Methods A total of 164 qualified mandibular first premolars were selected from departments of stomatology in several cities of Shandong Province to analyze the root types. The number of the teeth with root concavity was recorded. The root systems were analyzed with the transparent tooth specimen method and Vertucci's classification. Altogether 304 mandibular first premolar images were collected from the cone-beam CT image data of Department of Radiology, Stomatological Hospital of Shandong University. Results According to the transparent tooth specimen method, of the 164 teeth, 2 (1.22%) were double-rooted and 162 single-rooted. In the 162 singled-rooted teeth, typeⅠsystem accounted for 82.72%, type Ⅲ 1.23%, type Ⅳ 3.09%, type Ⅴ 12.96%, type Ⅱ, Ⅵ, Ⅶ, and Ⅷ system 0. The detection rate of double root-canal was 18.29%. Among the 36 teeth with root concavity, 21 had single and 15(41.67%) had double root-canal. From the results of cone-beam CT scan, 55(18.09%) of the teeth had double root-canal. Conclusion The rate of multiple root-canal in the mandibular first premolar root-canal of Shandong population is relatively high, which should be paid more attention by dentists.

Key words: Mandibular first premolar, Root canal morphology, Cone-beam CT, Transparent tooth specimen

CLC Number: 

  • R781
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