Computer-aided design-based guided endodontic: A novel approach for root canal access cavity preparation

Area of Science:

• Dentistry
• Biomedical Engineering
• Computer-Aided Design

Background:

• Traditional endodontic guide design relies on subjective visual analysis of scans, leading to time-consuming and expert-dependent procedures.
• Teeth with complex morphology, such as calcified root canals, present significant challenges for conventional endodontic access cavity preparation.

Purpose of the Study:

• To develop and validate a computer-aided design (CAD) methodology for fabricating customized endodontic guides.
• To enhance the accuracy and minimize invasiveness of root canal access cavity preparation in challenging cases.

Main Methods:

• Utilized cone beam computed tomography (CBCT) scans and MIMICS software to create 3D tooth models.
• Developed a MATLAB program to slice models, identify root canal axes, and determine optimal bur angulation for minimally invasive access.
• Fabricated guides using 3D printing and performed simulated and actual guided root canal access preparations on extracted teeth.

Main Results:

• Simulated verification showed minimal deviation (0.210 ± 0.04 mm) between the planned tool path and root canal axes.
• Post-preparation analysis revealed a small deviation (0.07 ± 0.02 mm) between the planned and prepared access cavity axes.
• The CAD-based methodology demonstrated high accuracy and feasibility for endodontic guide design.

Conclusions:

• The proposed computer-aided design methodology offers a precise and efficient approach to endodontic guide fabrication.
• This technique holds significant promise for improving outcomes in guided endodontic treatment, especially for teeth with unusual root canal morphology.