Journal of Peking University(Health Sciences) ›› 2015, Vol. 47 ›› Issue (1): 129-133.

• Articles • Previous Articles     Next Articles

Comparison of the incidences of apical root cracks after canal preparation with two nickel-titanium rotary systems: an in vitro study

CHEN Chen, LIANG Yu-hong△, GAO Xue-jun   

  1. (Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, Beijing 100081, China)
  • Online:2015-02-18 Published:2015-02-18

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.

Key words: Root canal preparation, Root crack, In vitro

[1] YANG Yin-jie, HOU Ben-xiang, HOU Xiao-mei. Effect of autoclave on surface microstructure and cyclic fatigue resistance of R-phase rotary instruments#br# [J]. Journal of Peking University(Health Sciences), 2018, 50(5): 882-886.
[2] CHEN Chen, ZHANG Wen-xin,QI Li-yuan,GAO Xue-jun, LIANG Yu-hong. Detection of root cracks after root canal preparation using rotary NiTi systems by optical coherence tomography (OCT) scan [J]. Journal of Peking University(Health Sciences), 2018, 50(3): 547-552.
[3] TIAN Shi-yu, BAI Wei, LIANG Yu-hong. Impact of apical preparation diameter on fracture resistance of mandibular premolar roots [J]. Journal of Peking University(Health Sciences), 2017, 49(1): 92-095.
[4] SU Zheng, BAI Yu-hao, HOU Xiao-mei. Effects of different techniques on removal of vapor lock in the apical region of curved canals: a cone-beam computed tomography study [J]. Journal of Peking University(Health Sciences), 2017, 49(1): 76-080.
[5] CHEN Xiao-bo, CHEN Chen, LIANG Yu-hong. Comparison of effectiveness and safety between Twisted File technique and ProTaper Universal rotary full sequence based on micro-computed tomography [J]. Journal of Peking University(Health Sciences), 2016, 48(1): 101-104.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!