T Taşdemir1, K Er, T Yildirim, D Celik. 1. Department of Endodontics, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey. tamertd72@yahoo.com
Abstract
AIM: To investigate the ability of three rotary nickel-titanium instruments and hand instrumentation to remove gutta-percha and sealer. METHODOLOGY:Sixty freshly extracted human single-rooted teeth, each with one root canal, were instrumented withK-files and filled using cold lateral compaction of gutta-percha and AH Plus (Dentsply Detrey, Konstanz, Germany) sealer. The teeth were randomly divided into four groups of 15 specimens each. Removal of gutta-percha was performed with the following devices and techniques: ProTaper, R-Endo, Mtwo and Hedström files. The specimens were rendered transparent and the area of remaining filling material on the root canal wall was measured using a computer image analysis program. Statistical analysis was accomplished by Kruskal-Wallis and Mann-Whitney U-tests with Bonferroni correction for the analysis of residual root filling material and working time. RESULTS: The ProTaper group had less filling material inside the root canals than the other groups, but a significant difference was found between only the ProTaper and Mtwo groups (P < 0.05). The retreatment time for Mtwo and ProTaper was significantly shorter compared with R-Endo and manual instrumentation with Hedström files (P < 0.001). R-Endo was significantly faster than manual instrumentation (P < 0.001). CONCLUSIONS: Under the experimental conditions, ProTaper left significantly less gutta-percha and sealer than Mtwo instruments. Complete removal of materials did not occur with any of the instrument systems investigated.
RCT Entities:
AIM: To investigate the ability of three rotary nickel-titanium instruments and hand instrumentation to remove gutta-percha and sealer. METHODOLOGY: Sixty freshly extracted human single-rooted teeth, each with one root canal, were instrumented with K-files and filled using cold lateral compaction of gutta-percha and AH Plus (Dentsply Detrey, Konstanz, Germany) sealer. The teeth were randomly divided into four groups of 15 specimens each. Removal of gutta-percha was performed with the following devices and techniques: ProTaper, R-Endo, Mtwo and Hedström files. The specimens were rendered transparent and the area of remaining filling material on the root canal wall was measured using a computer image analysis program. Statistical analysis was accomplished by Kruskal-Wallis and Mann-Whitney U-tests with Bonferroni correction for the analysis of residual root filling material and working time. RESULTS: The ProTaper group had less filling material inside the root canals than the other groups, but a significant difference was found between only the ProTaper and Mtwo groups (P < 0.05). The retreatment time for Mtwo and ProTaper was significantly shorter compared with R-Endo and manual instrumentation with Hedström files (P < 0.001). R-Endo was significantly faster than manual instrumentation (P < 0.001). CONCLUSIONS: Under the experimental conditions, ProTaper left significantly less gutta-percha and sealer than Mtwo instruments. Complete removal of materials did not occur with any of the instrument systems investigated.
Authors: Santhoshini Reddy; Prasanna Neelakantan; Mohammad Ali Saghiri; Mehrdad Lotfi; Chandragiri Venkata Subbarao; Franklin Garcia-Godoy; James L Gutmann Journal: Int J Dent Date: 2011-11-15