Root canal conicity estimation of primary maxillary central and lateral incisors—A study by Nano‐CT

Abstract

Aim: The objective of the study was to estimate the conicity of the root canals of maxillary central and lateral incisors by computed nanotomography (Nano-CT). Design: This in vitro study included nine extracted primary maxillary central incisors and 12 maxillary lateral incisors, which were subjected to Nano-CT analysis. The resulting images of each tooth were reconstructed using the OnDemand3D software, and root canal area, volume, and taper analysis were performed using the free FreeCAD 0.18 software for the 3D computer-aided design (CAD) model. Data were statistically analysed using the Stata v14.0 software, adopting a significance level of 5%. Results: The results presented the mean value of the diameter and area of the root canal of primary central and lateral incisors. In addition, the taper values for both dental groups between points D0-D5, D5-D7, and D7-D10 were determined. Considering the diameters obtained over the entire length of the root, with a length of 12 mm, a conical model was constructed. Conclusion: Detailed knowledge of root morphology of maxillary central and lateral incisors of primary dentition by means of Nano-CT is important to achieve faster, more accurate, and efficient endodontic treatments.

Micro-CT evaluation of root canal preparation with rotary instrumentation on prototyped primary incisors

“…Finally, although the most indicated file size and tapers belonging to each instrumentation system were selected to fit the experimental model, it is acknowledged that the compared files showed some differences with regard to the size and tapers. The rationale for selecting these instruments/tapers are based on the evidence suggesting that the minimum apical taper instrumentation for primary incisors lies between #40 and #50 (K-files), 39,40 which is also the reason for the use of HF#45 in this study. With respect to the reciprocating movement, a previous study showed that the R40 file has been the most suited one for apical preparation of the prototype used in the present study, which offers the best compromise between dentin removal, non-instrumented areas, and the presence of debris.…”