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

Abstract

The aim of this study was to compare the apical centring ability of incisal-shifted access (ISA) with that of traditional lingual access (TLA). Fifteen three-dimensional printed resin models were prepared from the computed tomography data for a human maxillary central incisor and divided into ISA (n=7), TLA (n=7), and control (n=1) groups. After access preparation, these models were shaped to the working length using K-files up to #40, followed by step-back procedures. An apical portion of the model was removed at 0.5 mm coronal to the working length. Microscopic images of each cutting surface were taken to measure the preparation area and the distance of transportation. TLA created a larger preparation area than ISA (p < 0.05). The distance of transportation (mean ± standard deviation) was 0.4 ± 0.1 mm for ISA and 0.7 ± 0.1 mm for TLA (p < 0.05). Access cavity preparation has a significant effect on apical centring ability. ISA is beneficial for maintaining apical configuration.

3D Printing and Digital Processing Techniques in Dentistry: A Review of Literature

“…The exported STL file guides the 3D printer to produce the template . The acquired and available CBCT scan data are converted into stereolithography files so that the 3D printer is under processing …”

“…In order to understand the advantages of CBCT, CBCT was compared with intraoral surface scanning through special software of previous studies. This allows the virtual custom programming to best access the cavity up to the top third of the root . In this tool, the 3D printing template directs the custom bit to the orifice of the root canal.…”

“…In fact, it cannot be run as a regular method because it is complex to implement and difficult to access. However, owing to the quality of the research and new perspectives of researches, X‐ray synchrotron imaging is becoming a more and more powerful research and inevitable process for studying important specimens of science . SEM involves bombarding a target with electrons, which are automatically redirected due to the nature and morphology of the sample.…”

“…PLGA is a copolymer of polylactic acid (PLA) and polyglycolic acid (PGA), and has been used broadly in a host of US Food and Drug Administration (FDA)‐approved therapeutic devices, such as sutures, grafts, and macro/micro/nanoparticles, due to its biodegradability and biocompatibility. These remarkable properties and efficient performance as compared to other materials, make it stand out in the biomedical field …”

Endodontic applications of 3D printing

“…) of different rotary file systems, centring ability of access preparations (Yahata et al . ) and different obturation techniques for C‐shaped canals (Gok et al . ) have been investigated with uniformly controlled canal configurations.…”