The influence of various automated devices on the shaping ability of Mtwo rotary nickel‐titanium instruments
- 11 September 2006
- journal article
- research article
- Published by Wiley in International Endodontic Journal
- Vol. 39 (12), 945-951
- https://doi.org/10.1111/j.1365-2591.2006.01171.x
Abstract
Aim To compare the shaping ability of Mtwo rotary nickel‐titanium instruments in simulated curved canals and in curved canals of extracted teeth when set into permanent rotation with two different torque‐limited automated devices. Methodology Root canal instrumentation was performed with two different torque‐limited automated devices (Mtwo direct handpiece and Endo IT motor) using Mtwo rotary nickel‐titanium instruments up to size 35. Simulated canals: 28° and 35° curved canals in resin blocks (n = 20 canals in each group) were prepared. Pre‐ and post‐instrumentation images were recorded and assessment of canal shape was completed with a computer image analysis program. Extracted teeth: a total of 40 curved root canals were divided into two groups, which were balanced with respect to the angle and the radius of canal curvature. Straightening of the canal curvatures was determined with a computer image analysis program. Incidence of canal aberrations, preparation time, changes of working length and instrument failures were recorded both in simulated and real canals and were analysed using the t‐test and a chi‐square test. Results In simulated canals, instrumentation with Endo IT was significantly faster than with Mtwo direct (P < 0.05). No significant differences between the two devices were noted when all other parameters were assessed (P > 0.05). Only one instrument separated (Mtwo direct) during the enlargement of 28° curved simulated canals. All systems maintained working distance well. Conclusions Both systems respected original root canal curvature well and were safe, indicating that the Mtwo direct handpiece is suitable for preparing curved root canals with the Mtwo instruments.This publication has 18 references indexed in Scilit:
- Comparative study on the shaping ability and cleaning efficiency of rotary Mtwo instruments. Part 2. Cleaning effectiveness and shaping ability in severely curved root canals of extracted teethInternational Endodontic Journal, 2006
- Comparative study on the shaping ability and cleaning efficiency of rotary Mtwo instruments. Part 1. Shaping ability in simulated curved canalsInternational Endodontic Journal, 2006
- A comparative study of Endoflare–Hero Shaper and Mtwo NiTi instruments in the preparation of curved root canalsInternational Endodontic Journal, 2005
- Influence of different types of automated devices on the shaping ability of rotary nickel-titanium FlexMaster instrumentsInternational Endodontic Journal, 2005
- Mechanical preparation of root canals: shaping goals, techniques and meansEndodontic Topics, 2005
- Comparative investigation of two rotary nickel–titanium instruments: ProTaper versus RaCe. Part 1. Shaping ability in simulated curved canalsInternational Endodontic Journal, 2004
- Comparative investigation of two rotary nickel–titanium instruments: ProTaper versus RaCe. Part 2. Cleaning effectiveness and shaping ability in severely curved root canals of extracted teethInternational Endodontic Journal, 2004
- Influence of torque control motors and the operator’s proficiency on ProTaper failuresOral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, 2003
- Shaping ability of ProFile.04 Taper Series 29 rotary nickel‐titanium instruments in simulated root canals. Part 1International Endodontic Journal, 1997
- A comparison of canal preparations in straight and curved root canalsOral Surgery, Oral Medicine, Oral Pathology, 1971