Shaping ability of Reciproc and TF Adaptive systems in severely curved canals of rapid microCT-based prototyping molar replicas

Abstract

Objective:To evaluate the shaping ability of Reciproc and Twisted-File Adaptive systems in rapid prototyping replicas.Material and Methods:Two mandibular molars showing S-shaped and 62-degree curvatures in the mesial root were scanned by using a microcomputed tomography (μCT) system. The data were exported in the stereolitograhic format and 20 samples of each molar were printed at 16 µm resolution. The mesial canals of 10 replicas of each specimen were prepared with each system. Transportation was measured by overlapping radiographs taken before and after preparation and resin thickness after instrumentation was measured by μCT.Results:Both systems maintained the original shape of the apical third in both anatomies (P>0.05). Overall, considering the resin thickness in the 62-degree replicas, no statistical difference was found between the systems (P>0.05). In the S-shaped curvature replica, Reciproc significantly decreased the thickness of the resin walls in comparison with TF Adaptive.Conclusions:The evaluated systems were able to maintain the original shape at the apical third of severely curved mesial canals of molar replicas.

Quantitative transportation assessment in simulated curved canals after large apical preparations

“…The null hypothesis was then rejected. Previous studies have already shown that the TFA system induced lower canal transportation and produced a better centering ability when compared to rotary 14 and reciprocating systems 10,21 . This result may be explained by the TFA system unique design features (special surface conditioning, R-phase heat treatment and twisting of the metal) 9,10 associated with its lower taper (0.04).…”

Reciprocating instrumentation in a maxillary primary central incisor: A protocol tested in a 3D printed prototype

“…In the present study, instrumentation was performed using a prototyped primary maxillary central incisor. According to previous studies, the use of these prototyped resin replicas is very promising and has the potential to be used for educational purposes, endodontic training, and research due to the sample standardization, allowing to assess the root canal instrumentation in laboratory‐based studies …”

Comparison of apical centring ability between incisal‐shifted access and traditional lingual access for maxillary anterior teeth

“…The physical properties of tooth models should be similar to those of natural teeth. However, acrylic resin, which has been used in ex vivo studies (28), obviously had different hardness (29). The Shore D hardness of the 3D printed material used in this study is reported to be 85 (16), which is higher than that of acrylic resin (30).…”