Double Roots of Mandibular Premolar in Full-mouth Periapical Films

Kong Ling-jia; Wan Kuo; Liu Deng-gao

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Double Roots of Mandibular Premolar in Full-mouth Periapical Films

中国医学科学杂志（英文版） 2015年30卷第3期页码：174-178

Orginal Article | Updated：2024-04-10

- Double Roots of Mandibular Premolar in Full-mouth Periapical Films
- Affiliations：
  
  1Department of Stomatology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China;
  2Department of Radiology, Peking University School of Stomatology, Beijing 100081, China
- Author bio：
  
  *Corresponding author Tel: 86-10-69155256, E-mail: wankuo@126.com
- Funds：
- DOI：
  中图分类号：
- 网络出版日期：2015-06-20，
  
  纸质出版日期：2015-06
- Accepted：
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Double Roots of Mandibular Premolar in Full-mouth Periapical Films[J]. 中国医学科学杂志（英文版）, 2015,30(3):174-178.

Kong Ling-jia, Wan Kuo, Liu Deng-gao. Double Roots of Mandibular Premolar in Full-mouth Periapical Films[J]. Chinese medical sciences journal, 2015, 30(3): 174-178.
Double Roots of Mandibular Premolar in Full-mouth Periapical Films[J]. 中国医学科学杂志（英文版）, 2015,30(3):174-178. DOI：

Kong Ling-jia, Wan Kuo, Liu Deng-gao. Double Roots of Mandibular Premolar in Full-mouth Periapical Films[J]. Chinese medical sciences journal, 2015, 30(3): 174-178. DOI：

摘要

Abstract

Objective

To evaluate the incidence of two-rooted mandibular premolar morphology using full-mouth periapical film series in a Chinese population

with particular emphasis on bilateral incidence

so as to provide a clinical anatomical basis for root canal treatment in mandibular premolars.

Methods

A total of 2015 patients who underwent dental treatment and had full mouth periapical radiographs at the Peking University School of Stomatology from April 2011 to April 2012 were enrolled in this study. Three experienced dentists reviewed the patients’ periapical films and classified the root morphology of mandibular premolars bilaterally. The incidence of unilateral and bilateral double roots were recorded and calculated

including confirmed and suspected bucco-lingual root types.

Results

In terms of the morphology of two-rooted mandibular first premolars

of the 2015 cases with complete root formation

two-rooted first premolars were detected in 120 cases

with a total number of 159 teeth. According to the number of teeth

the overall incidence of double roots was 4.03% (159/3972). In terms of the morphology of two-rooted mandibular second premolars

of the 2015 cases with complete root formation

two-rooted second premolars were detected in 24 cases

with a total number of 33 teeth. According to the number of teeth

the overall incidence of double roots was 0.85% (33/3880).

Conclusions

The roots of mandibular premolars display specific morphological patterns. Based on a large sample

we observed and calculated not only the occurrence rate of bucco-lingual and mesio-distal double roots in first and second mandibular premolars

but also the incidence of unilateral or bilateral double roots within the same mandible. These findings could provide useful information on the anatomical structure of mandibular premolars for endodontic

prosthodontic and surgical procedures

and could improve the quality of treatment and reduce complications.

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Keywords

references

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