Comparison of shaping ability between various hybrid instrumentation methods with ProTaper

Abstract

The purpose of this study was to compare and evaluate the shaping abilities of various hybrid instrumentation method using constant tapered file systems with ProTaper � S1 and the difference between experts and inexperienced clinicians in use of NiTi file.Three hybrid methods used in this study were composed of ProTaper � S1 and K-Flexofile � (group S), ProTaper � S1 and HeroShaper � (group H), and ProTaper � S1 and ProFile � (group P), respectively. The ProTaper � -alone method (group C) was introduced as a control group. After canal preparation, the lapse of time was recorded. The images of pre-and post-operative canal were scanned and superimposed. Amounts of instrumented canal widths and centering ratio were measured at apical 1, 2 and 3 ㎜ levels and statistical analysis was performed.In this study, both of the group C and S took more time to prepare canals than other groups. Inexperienced operators required more time for the entire preparation with the groups C and H than the experienced (p < 0.05). And the centering ratio of group P were preferable to ProTaper � -alone method or the hybrid technique using stainless steel files. As such, within experienced operators, group H also showed better results in addition to the group P.Under these condition, the hybrid methods of each the ProFile � system and HeroShaper � with ProTaper � are recommendable comparative to ProTaper � -alone method. According to the results, the hybrid instrumentation method is a more appropriate method of canal preparation than single file system for narrow or curved canals.

Comparison of shaping ability using various Nickel-Titanium rotary files and hybrid technique

“…Particularly, at 2 ㎜ level the two ProTaper systems showed significantly lesser centering ratios than Group H. The ProFile had the better centering ability than the other groups in most of evaluated levels. This finding is consistent with other studies to evaluate the centering ratio or shaping ability of various NiTi files including ProFile 24,28) . Hong et al 24) recommended, through the comparison of various hybrid instrumentation technique, that if the apical regions are to be enlarged wider than ISO 30, it might be better to use a different system 12) .…”

“…This finding is consistent with other studies to evaluate the centering ratio or shaping ability of various NiTi files including ProFile 24,28) . Hong et al 24) recommended, through the comparison of various hybrid instrumentation technique, that if the apical regions are to be enlarged wider than ISO 30, it might be better to use a different system 12) . But this study showed that all experimental system makes similar centering ratio except Group P. Schäfer et al 16) reported that ProTaper tended to transport towards the outer aspect of the canal curvature.…”

“…To increase safety, most endodontic teachers and educators emphasize sufficient supervised training by endodontists that have mastered any particular system 7) . The hybrid methods of each the ProFile and Hero Shaper system with ProTaper S1 are recommendable comparative to ProTaper alone method in the study of Hong et al 24) , however, according to the present results, we can suggest the ProTaper Universal alone may be an appropriate method comparable with hybrid techniques in curved root canal preparation.…”

“…Based on the comparative report of mathematical models of ProTaper and ProFile, the results have shown that the ProTaper might be more indicated for narrow canals and curved canals during the initial phase of shaping and that the ProFile might be more indicated in the final phase of shaping 18) . Hong et al 24) recommended that the hybrid technique using the ProTaper S1 combined with ProFile or Hero series. Especially in novice operator, the combined usage of ProTaper and ProFile was shown to have the better apical centering ratio than ProTaper alone and other hybrid method using stainless steel file or Hero Shaper.…”

Comparison of shaping ability between single length technique and crown-down technique using Mtwo rotary file

“…In this study, there was no statistical difference in instrument distortion that occurred only group MT, which can be interpreted due to using new files in each canal 26) and the adoption of torque control motors for the experiment 26,27) . The fact that none of the Mtwo files fractured after enlargement of canal may be due to the increasing pitch length from the tip to the shaft of these instruments 8) .…”