Comparison of dentinal microcracks caused by new generation of single reciprocating files after root canal preparation

doi:10.19439/j.sjos.2023.01.001

Abstract

Abstract: PURPOSE: To compare the incidence of dentinal microcracks after root canal preparation by new generation of nickel-titanium instrument WaveOne Gold, Reciproc Blue with previous WaveOne and Reciproc. METHODS: Ninety extracted single-rooted mandibular premolars were randomly divided into 6 groups(n=15). The root canals were instrumented by using Hand K files, WaveOne, Reciproc, WaveOne Gold and Reciproc Blue. Fifteen teeth were left unprepared and served as negative controls. The root canals were all prepared to 25#. The roots were then sectioned at 3 mm, 6 mm and 9 mm from the apical orifice using a hard tissue slicer. The slices were observed under stereoscopic microscope at ×25 magnification. SPSS 17.0 software package was used for statistical analysis. RESULTS: No dentinal microcrack was found in the hand K files group and negative control group. The reciprocating single files WaveOne, WaveOne Gold, Reciproc and Reciproc Blue all produced dentinal microcracks after root canal preparation. The WaveOne generated the most dentinal microcracks than the hand K files(P<0.05), and the microcracks were mainly concentrated in the middle part of the root. The number of dentinal microcracks caused by Reciproc and Reciproc Blue was the same, with no significant difference(P>0.05). CONCLUSIONS: The new generation of reciprocating files of WaveOne Gold and Reciproc Blue may not increase the incidence of dentinal microcracks after root canal preparation.

Key words: Dentinal microcracks, WaveOne, Reciproc, WaveOne Gold, Reciproc Blue

CLC Number:

R781.3

ZHANG Bin, JIA Ming-yu, FAN Rui, TIAN Jian-gang, GE Xue-jun, HUANG Rui-zhe. Comparison of dentinal microcracks caused by new generation of single reciprocating files after root canal preparation[J]. Shanghai Journal of Stomatology, 2023, 32(1): 1-5.

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