Year : 2018

Volume : Volume 9

Issue : Issue 3

Address for correspondence :
Dr. Aruna Kanaparthy.
draruna15@gmail.com

Abstract

Background:  The aim of this study was to determine the cracks formation in root dentin after retreatment procedures performed by using three rotary retreatment systems and hand files. Materials and methods: Forty mandibular premolars extracted for orthodontic reasons were selected. The teeth were prepared with F2 ProTaper hand files and filled with gutta-percha and AH Plus sealer. Specimens were then divided into 4 groups (n = 10), and retreatment procedures were performed with the following techniques: group 1 hand filing using H files, group 2 ProTaper Universal retreatment files, group 3 MicroMega retreatment files and group 4 Mtwo retreatment files and and the average time taken for each sample was noted. All roots were then sectioned perpendicular to the long axis at coronal, middle and apical portions. The sections were inspected under a stereomicroscope, and crack formations were recorded. Statistical Analysis: The data was analyzed with a chi-square test and one way ANOVA test.  Results: There were crack formations in all the groups. Coronal cracks were significantly more than apical cracks in all the groups and M-two retreatment files showed significantly greater percentage of cracks as compared to other groups. Conclusion: Dentinal cracks are associated with both hand and rotary files due to stresses on the root canal walls. However, hand files demonstrated lesser cracks when compared to rotary files and coronal cracks were more than apical files indicating areas of stress concentration.

Keywords: Retreatment, Rotary files, Dentinal cracks, Hand files.