Abstract
Reproduction of the exact interocclusal relationship using digital workflow is crucial for precise fabrication of accurate prostheses. Intraoral scanner is known to be valid for the measurement of quadrants, however, the role of missing area in the quadrant scan on the virtual interocclusal record (VIR) is uncertain. This study aimed to evaluate the accuracy of VIR in quadrant scans using an intraoral scanner (IOS) under four different edentulous conditions. Eight scans per group were obtained using a laboratory scanner and three IOSs (Trios3, CS3600, i500). Based on trueness and precision, Trios3 had the best results, followed by CS3600 and i500. The trueness and precision were affected by edentulous conditions. The three IOSs showed deviation in the posterior region during assessment of VIR for the missing area with posterior support. CS3600 and i500 showed deviation in the short-span edentulous area without support. In extended edentulous condition without support, Trios3 showed overclosure, while i500 showed an angular deviation. In some groups scanned with Trios3 and i500, the tilting effect was observed. Based on the edentulous condition and type of IOS used, local or general deviations in occlusion were seen. The accuracy of VIR was dependent on accurate scan data. Thus, registration of the occlusal relationship in an edentulous area with more than two missing teeth using IOSs may be clinically more inaccurate than that with a laboratory scanner.
Highlights
Advances in computer-aided design/computer-aided manufacturing (CAD/CAM)technology have replaced many conventional techniques for dental prostheses fabrication [1,2]
Using intraoral scanner (IOS), a digital image of the dental arch can be obtained by acquiring a digital impression directly in the mouth, without a tray or impression material, which are needed in conventional techniques [3,4]
The trueness shows different deviation according to edentulous conditions
Summary
Technology have replaced many conventional techniques for dental prostheses fabrication [1,2]. Using IOSs, a digital image of the dental arch can be obtained by acquiring a digital impression directly in the mouth, without a tray or impression material, which are needed in conventional techniques [3,4]. The IOS is an important system in the digital workflow using CAD/CAM technology and has undergone continuous advancement in recent years. For the fabrication of a long-span prosthesis, the impression obtained by the IOS system is not as accurate as that by the conventional technique [6]. In other words, when scanning a long-span arch using an IOS, errors in stitching images could occur; conventional impression methods are still required [7]
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