Accuracy of CAD/CAM Technology in Fabricating Custom Post-and-Core Restorations: A Comparative Analysis

This study aims to compare the accuracy of various intraoral scanners and traditional analog impressions in scanning root canals for CAD/CAM post-fabrication.

A dental mannequin with a factory-made #21 tooth root canal was used to simulate clinical settings. Three intraoral scanners were tested: CEREC Primescan, TRIOS 3, and CEREC Omnicam. The inEos X5 desktop scanner provided high-resolution control images. The analog impression polyvinyl siloxane (PVS) material was used with custom trays, following standard protocols. The surface areas were measured with CAD software and compared with the desktop scanner's reference.

Primescan demonstrated the highest accuracy among the intraoral scanners, followed by Trios 3 and Omnicam. Significant differences were found between each scanner and the true surface area. The analog impression method demonstrated superior accuracy compared with intraoral scanners; however, this high precision is attributed to irregularities in the silicone material.

The analog impression method was more accurate in capturing the details of complex root canal anatomy; however, material irregularities can affect its clinical efficacy. Intraoral scanners showed high accuracy but had some limitations in capturing complex geometries. Further development of scanner technology will increase precision and, therefore, the clinical outcome.

The use of CAD/CAM technology and intraoral scanners offers potential for precise, custom-fit post-and-core restorations.