A STUDY OF CLINICAL APPLICATION OF DENTAL CAD/CAM SYSTEM

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The clinical application was carried out using CAD/CAM systems for crown, and the evaluation of the system was examined. In the measurement of antagonistic tooth, the antagonistic tooth was described by the exclusive black occlusion material. And there was the danger which had designed the crown that it slightly stands out from the model and is higher than the practice, when this was measured. It is considered that on this, it must be also examined that the direct antagonistic tooth model is measured. The data for the processing in which that CAD software becomes more and more practical, and that moreover, the design in the detail easily does it in the short time of 10-20 minutes would be possible was automaticaliy made in 15〜20 minutes. The processing time finished within 60 minutes almost. And, the problem might be also clinically very effective without recognizing especialiy, abutment tooth mounting condition. Using measured data of the abutment tooth, thickness of the crown was continuously measured in addition to each facing tilt angle of meslal-distal axial surface and buccal-lingual side axial surface as an application to the dentistry education in 1998. In the menu of the CAD software, after the formation there is a function which automatically checks the thickness of designed crown, and first the reference value of the thickness of the crown is input, and this function is applied this time abutment tooth data crown external form data reference value screen, and the data of melamine tooth In the before formed as a crown data is registered. Deletion quantity of thickness of the crown was measured by the comparison with the abutment tooth data. In the macroscope, by present evaluation method, It was judged as the result, that the decision became also automatically possible on the deletion shortage of small range with the difficult decision and that the over half of formed abutment tooth is insufficient in the deletion.