Comparison of the measurement error of optical impressions obtained with four intraoral and one extra-oral dental scanners of post and core preparations.

Statement Of Problem: Innovations in intraoral scanner (IOS) technology are opening up ever more indications for computer-aided design and manufacturing (CAD-CAM). The manufacturers claim that the latest generations of scanners allow the digitizing of root canal preparations. However, there is a lack of studies evaluating the quality of the optical impressions made for this type of treatment.

Volumetric and dimensional accuracy assessment of CAD-CAM-manufactured dental prostheses from different materials.

Statement Of Problem: In computer-aided design and computer-aided manufacturing (CAD-CAM) dentistry, the CAD of the prosthesis represents the clinical prerequisite design to restore the treated tooth. However, how closely the CAM prosthesis shape matches the CAD, particularly in relation to different materials, is unclear.

Purpose: The purpose of this in vitro study was to evaluate onlays designed and manufactured with the same CAD-CAM system but manufactured with different materials.

Comparison of the acquisition accuracy and digitizing noise of 9 intraoral and extraoral scanners: An objective method.

Statement Of Problem: The quality of the digital cast obtained from an intraoral scanner is an important comparison parameter for computer-aided design and computer-aided manufacturing (CAD-CAM) restorations. However, data on cast quality are typically provided by manufacturers, and objective evaluation of these devices is lacking.

Purpose: The purpose of this in vitro study was to build an evaluation protocol of 8 intraoral scanners by using an objective method for a small-scale model equivalent in size to a 4-tooth wide cast.

Evaluation of the dimensional accuracy of a manufactured dental prosthesis in relation to its computer-aided model.

Aim: Currently, there is no reliable methodology to evaluate the dimensional conformity of dental prostheses manufactured through a digital shaping process. In the CAD/CAM method, the digital design of the prosthesis is considered as a reference, and it is crucial to reproduce it perfectly during the manufacturing process. Therefore, the aim of this study was to offer a comparison between a CAM prosthesis and its design model by superimposing the CAD model with the digitization of the manufactured prosthesis.

Evaluation of the marginal fit of CAD-CAM zirconia copings: Comparison of 2D and 3D measurement methods.

Purpose: The purpose of this in vitro study was to compare the marginal fit of zirconia copings by using 2 different measurement methods: a triple optical scan method and a silicone replica method.

Material And Methods: Sixty zirconia copings fabricated by computer-aided design and computer-aided manufacture (CAD-CAM) systems were studied for the marginal fit. For the replica method, the thickness of the light-body silicone layer of the discrepancy was assessed using light microscopy and image analysis software.

3D fitting accuracy evaluation of CAD/CAM copings - comparison with spacer design settings.

Objectives: The accuracy of computer-aided design/computer- aided manufacturing (CAD/CAM) systems is linked to their technical characteristics and reliability for manufacturing the restoration designed. The aim of this study was to compare the accuracy of fit of zirconia copings manufactured with different CAD/CAM systems and their capacity to conform to pre-established spacer design settings.

Methods: Sixty zirconia copings were manufactured by three CAD/CAM systems, with their spacers set as recommended by their manufacturer on occlusal, axial, and marginal surfaces.

Understanding dental CAD/CAM for restorations--accuracy from a mechanical engineering viewpoint.

As is the case in the field of medicine, as well as in most areas of daily life, digital technology is increasingly being introduced into dental practice. Computer-aided design/ computer-aided manufacturing (CAD/CAM) solutions are available not only for chairside practice but also for creating inlays, crowns, fixed partial dentures (FPDs), implant abutments, and other dental prostheses. CAD/CAM dental practice can be considered as the handling of devices and software processing for the almost automatic design and creation of dental restorations.

Influence of CAD/CAM tool and material on tool wear and roughness of dental prostheses after milling.

Statement Of Problem: Computer-aided design/computer-aided manufacturing (CAD/CAM) machining influences the surface roughness of dental restorations and tool wear. Roughness must be suitable to meet clinical requirements, and the tool must last as long as possible.

Purpose: The purpose of this pilot study was to investigate the influence of the CAD/CAM tool-material couple on tool wear and surface roughness after milling.