Anatomical morphology of the root and root canal system of the second permanent molar in the Uygur people
10.12016/j.issn.2096-1456.2019.08.009
- Author:
LIU Fang
1
;
GU Yongchun
2
;
GUO Hong
3
;
TANG Ying
2
;
LIU Chao
2
;
SHEN Yifen
2
Author Information
1. Department of Stomatology, The First People′s Hospital of Urumqi
2. Central Lab, The Ninth People′s Hospital of Suzhou
3. Department of Periodontics, The Stomatological Hospital of Urumqi
- Publication Type:Journal Article
- Keywords:
Uygur people;
permanent mandibular second molar;
root canal system;
C-shaped canal;
micro-CT
- From:
Journal of Prevention and Treatment for Stomatological Diseases
2019;27(8):522-526
- CountryChina
- Language:Chinese
-
Abstract:
Objective :To study the anatomical characteristics of the root and root canal system of the mandibular second permanent molar in the Uygur people and provide a reference for clinical practice.
Methods :A total of 125 mandibular second permanent molars were extracted from Uygur patients in hospitals in the Xinjiang Uygur Autonomous Region. Three-dimensional reconstruction was performed after micro-CT scanning. The number of root canals, the root canal type (Weine classification and Fan′s C-shaped canal classification) and the occurrence of lateral accessory canals were observed.
Results :A sex difference was not detected in the root number or root form (χ2 = 1.277, P = 0.259). The incidence of 2-rooted molars was 70.4% (n = 88); type 2-1 canals were most common in the mesial root, with an incidence of 29.5%, followed by type 1-1 and 2-2 canals (each with an incidence of 26.1%), and the distal root mostly had a type 1-1 canal (96.6%). The incidence of single-rooted molars was 28.8%, and the frequency of C-shaped (n = 28) and non-C-shaped (n = 8) single-rooted molars was 22.4% and 6.4%, respectively. A three-rooted molar was detected in one case. The incidence of accessory canals was 65.2%.
Conclusion : Uygur mandibular second molars are mainly composed of two roots, and the incidence of a single root and root canal fusion is low (including C-shaped canals). Two-rooted molars frequently have two mesial canals and one distal canal.
- Full text:维吾尔族人下颌第二恒磨牙牙根及根管系统的解剖形态.pdf
