Comparison of the incidences of apical root cracks after canal preparation with two nickel-titanium rotary systems:an in vitro study
10.3969/j.issn.1671-167X.2015.01.024
- VernacularTitle:两种镍钛系统根管预备后发生牙根微裂的体外研究
- Author:
Chen CHEN
;
Yuhong LIANG
;
Xuejun GAO
- Publication Type:Journal Article
- Keywords:
Root canal preparation;
Root crack;
In vitro
- From:
Journal of Peking University(Health Sciences)
2015;(1):129-133
- CountryChina
- Language:Chinese
-
Abstract:
Objective: To compare the incidences of root cracks after canal instrumentation with HyFlex CM system and the ProTaper Universal system .Methods:Sixty mandibular incisors were mounted in resin blocks with simulated periodontal ligaments , and the apex was exposed .The control group of 20 teeth was not prepared , and the other 40 teeth were divided into 2 experimental groups ( n=20 ) .The 40 root canals of the experimental groups were instrumented using HyFlex CM and ProTaper Universal to the major apical foramen ( AF).The horizontal sections 1 mm, 2 mm, and 3 mm from the apex were observed under an optical stereomicroscope at 25 ×magnification .The presence of cracks was noted . Results:No cracks were found in the control teeth .Cracks were found in 1 of 20 ( 5%) teeth in HyFlex CM group , and 17 of 20 ( 85%) teeth in ProTaper Universal group .The difference between the two experimental groups was statistically significant (P<0.01).Conclusion: The HyFlex CM files caused fewer root cracks than the ProTaper Universal files during the root canal instrumentation .
