ABSTRACT
The success of root canal therapy requires effective cleaning and shaping of canals. The present study was conducted to compare canal transportation and centric ability of CM and WO file system. Methods: The present study was conducted on 40 recently extracted mandibular premolars of both genders. The teeth were randomly divided into 2 groups. In group I, teeth were prepared using HyFlex CM files up to 25/0.4 and in group II, teeth were prepared using WO files up to 25/0.8.The amount of canal transportation was evaluated by measuring the shortest distance from the edge of uninstrumented canal to the periphery of the root (mesial and distal) and then comparing this with the same measurements obtained from the instrumented images. The mean centering ratio indicates the ability of the instrument to stay centered in the canal. Results: Canal transportation was small in group I as compared to group II at 3mm, 9mm and 12 mm. The difference was significant (P< 0.05). The mean centric ratio in group I was 0.394 at 3 mm, 0.311 at 9 mm and 0.459 at 12 mm. In group II, it was 0.514 at 3 mm, 0.501 at 9 mm and 0.782 at 12 mm. The difference was significant (P< 0.05). Conclusion: Canal preparation with HyFlex CM file system showed lesser transportation and better centering ability than WO file system.
ABSTRACT
The purpose of this study was to evaluate surface characteristics of Reciproc (R25) WaveOne (WO) &WaveOne Gold (WOG) files using SEM before and after use. Methods: fifteen primary files from each system were scanned for surface defects before instrumentation at 10x-1000x. Each file was planned to be used to instrument six root canals and then examined under SEM after preparing three and six canals at same magnifications. Data were scored and statistically analysed using CHI –SQ and Anova tests (p≤ 0.05). Results: Surface defects were detected in all study groups with higher values in WO & WOG group before use. Surface defects significantly increased in both WO and WOG groups after use as compared to R25. WO & WOG group showed significantly greater defects including metal strips, pitting, craters, micro-cracks and blunt edges (p≤ 0.05). Conclusions: Wave One Gold file has a different metallurgy due to its gold finish that does not enhance its resistance to surface defects during clinical use. Wave One and Wave One Gold showed significant increase in surface defects after six canal use which limits their usage in more than one teeth in single patient.
ABSTRACT
The cleaning and shaping of root canals is a major step in root canal treatment procedure, which aims at removal of all the tissue debris from the root canal space while removing the inner layers of root canal dentin. With Nickel titanium (NiTi) rotary instruments this goal is easier to achieve, even in curved root canals. The recently introduced Single file NiTi-rotary systems such as WaveOne, Reciproc, OneShape & F360 claim to be able to completely prepare and clean root canals with only one instrument. Use of single file rotary systems, are cost effective, time saving, reduce instrument fatigue and possible crosscontamination. The purpose of this article is to review single file Niti-Rotary systems for canal preparation.
ABSTRACT
OBJECTIVES: The aim of this study was to evaluate the shaping ability of newly marketed single-file instruments, Wave.One (Dentsply-Maillefer) and Reciproc (VDW GmbH), in terms of maintaining the original root canal configuration and curvature, with or without a glide-path. MATERIALS AND METHODS: According to the instruments used, the blocks were divided into 4 groups (n = 10): Group 1, no glide-path / Wave.One; Group 2, no glide-path / Reciproc; Group 3, #15 K-file / Wave.One; Group 4, #15 K-file / Reciproc. Pre- and post-instrumented images were scanned and the canal deviation was assessed. The cyclic fatigue stress was loaded to examine the cross-sectional shape of the fractured surface. The broken fragments were evaluated under the scanning electron microscope (SEM) for topographic features of the cross-section. Statistically analysis of the data was performed using one-way analysis of variance followed by Tukey's test (alpha = 0.05). RESULTS: The ability of instruments to remain centered in prepared canals at 1 and 2 mm levels was significantly lower in Group 1 (p < 0.05). The centering ratio at 3, 5, and 7 mm level were not significantly different. CONCLUSIONS: The Wave.One file should be used following establishment of a glide-path larger than #15.