A comparative study of four rotary NiTi instruments in preserving canal curvature, preparation time and change of working length

作者：Vahid Alavieh^*; Roohi Neda; Zayeri Farid

来源：Australian Endodontic Journal, 2009, 35(2): 93-97.

DOI：10.1111/j.1747-4477.2008.00135.x

• canal curvature
• FlexMaster
• Mtwo
• ProFile
• ProTaper
• working length
• working time

The purpose of this ex vivo study was to compare working time, working length changes and shaping effects using ProTaper, ProFile, FlexMaster and Mtwo rotary instruments. A total of 96 mesiobuccal roots of the first maxillary molars were prepared using these instruments. Using pre and post-radiographs, canal curvature and working length were measured. In addition, the time required for canal preparation was recorded. Data was statistically analysed using one-way anova and Duncan's post-hoc tests. ProTaper significantly lessened the canal curvature (P < 0.001), and Mtwo rotary instruments took significantly less instrumentation time (P < 0.001). No significant difference was observed between the four groups in changing working lengths (P = 0.081). According to the results of the study, the Mtwo rotary instruments required significantly less instrumentation time, and the ProTaper significantly changed the canal curvature.

• 出版日期2009-8