Influence of NiTi alloy on the root canal shaping capabilities of the ProTaper Universal and ProTaper Gold rotary instrument systems

Abstract

Objective This study aimed to evaluate the influence of the NiTi wire in Conventional NiTi (ProTaper Universal PTU) and Controlled Memory NiTi (ProTaper Gold PTG) instrument systems on the quality of root canal preparation.Material and Methods Twelve mandibular molars with separate mesial canals were scanned using a high-definition microcomputed tomography system. The PTU and PTG instruments were used to shape twelve mesial canals each. The canals were scanned after preparation with F2 and F3 instruments of the PTU and PTG systems. The analyzed parameters included the remaining dentin thickness at the apical and cervical levels, root canal volume and untouched canal walls. Data was analyzed for statistical significance by the Friedman and Dunn’s tests. For the comparison of data between groups, the Mann-Whitney test was used.Results In the pre-operative analysis, there were no statistically significant differences between the groups in terms of the area and volume of root canals (P>.05). There was also no statistically significant difference between the systems with respect to root canal volume after use of the F2 and F3 instruments. There was no statistical difference in the dentin thickness at the first apical level between, before and after instrumentation for both systems. At the 3 cervical levels, the PTG maintained centralization of the preparation on the transition between the F2 and F3 instruments, which did not occur with the PTU. Conclusion The Conventional NiTi (PTU) and Controlled Memory NiTi (PTG) instruments displayed comparable capabilities for shaping the straight mesial root canals of mandibular molars, although the PTG was better than the PTU at maintaining the centralization of the shape in the cervical portion.

Effect of larger apical size on the quality of preparation in curved canals using reciprocating instruments with different heat thermal treatments

“…In addition, heat‐treated instruments tend to have a greater centring ability than conventional NiTi alloys (Duque et al . , Ozyürek et al . , Bürklein et al .…”

“…Manufacturers have introduced several modifications in design and alloy NiTi instruments to improve their mechanical properties and safety during root canal preparation, mainly in curved canals (Duque et al . , Alcalde et al . , Bürklein et al .…”

Evaluation of apical transportation and centring ability of five thermally treated NiTi rotary systems

“…) and the ProTaper Gold system (Elnaghy & Elsaka , Duque et al . ), which are manufactured by the conventional machining method. Further studies are necessary for a better understanding of the behaviour of this instrument.…”

“…The influence of the manufacturing method on the cutting power of the instruments was not evident because in the apical and cervical region, there was statistical similarity between the Hyflex EDM system produced by electroerosion (Iacono et al 2017) and the ProTaper Gold system (Elnaghy & Elsaka 2016, Duque et al 2017, which are manufactured by the conventional machining method. Further studies are necessary for a better understanding of the behaviour of this instrument.…”

Several factors can affect the root canal transportation of MB2 canals in extracted maxillary first molars

“…, Duque et al . ) and concluded that the more flexible NiTi alloys favoured less canal transportation.…”