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Adaptability of CAD / CAM crowns measured by X-ray micro CT: standardization of measurement chain and three-dimensional gap size distribution

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Document pages: 13 pages

Abstract: Computer aided design and manufacturing systems are increasingly used to produce dental prostheses, but the parts produced are lack of evaluation, especially in the internal gap of final assembly, that is, the space between the prepared teeth and the prosthesis. X-ray micro computed tomography (micro CT) is a noninvasive imaging technology that enables internal inspection of components. Facts have proved that it is an effective tool for measuring gap. In this study, a protocol for quantifying gaps using micro CT was critically reviewed as an introduction to a new protocol designed to minimize errors and enable comparison between CAD CAM systems. In order to compare different systems, a standardized protocol is proposed, including two reference geometries. Micro CT is very useful to usd to acquire the reference geometries. A new 3D method is then proposed and a new indicator is defined (Gap Size Distribution (GSD)). In addition, the usual 2D measurements are described and discussed. The 3D gap measurement method proposed can be used in clinical case geometries and has the considerable advantage of minimizing the data processing steps before performing the measurements.

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