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首页> 外文期刊>International journal of computerized dentistry >Accuracy of CAD/CAM crown fit with infrared and LED cameras.
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Accuracy of CAD/CAM crown fit with infrared and LED cameras.

机译：CAD / CAM牙冠的精度适合红外和LED摄像机。

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The intraoral recording of digital images is a critical component of fabricating accurate Cerec restorations. This study evaluated the marginal fit and internal adaptation of Cerec ceramic crowns fabricated using different cameras, alternative powdering materials, and multiple image capture sequences.A master epoxy resin model was fabricated using a polyvinylsiloxane (PVS) impression of a typodont with an all-ceramic crown preparation on tooth 14. A titanium dioxide powder/mechanical sprayer and an aerosol contrast spray were used to create a uniformly reflective surface. An infrared laser Cerec 3/RedCam unit and LED Cerec AC/BlueCam unit were used to record images for crown fabrication. Three different image capture sequences were performed to record the data. Crowns were made for each test group using a Cerec AC unit with V3.80 software. The crowns were milled from blocks of IPS EmpressCAD. Marginal fit and internal adaptation of the crowns to the master model of the preparation was assessed with a measuring microscope at 20X. The data was analyzed using a two-way ANOVA.No significant differences were found in the marginal fit, axial wall adaptation, or occlusal wall adaptation between any of the test groups (p < 0.05).Within the confines of this in vitro study, there were no significant differences between the marginal fit and internal adaptation of Cerec CAD/CAM ceramic crowns fabricated with: 1) the infrared laser camera (RedCam) and the LED camera (BlueCam), 2) titanium dioxide powder or aerosol contrast spray, or 3) multiple imaging sequences for recording the preparation and adjacent teeth.
机译：数字图像的口内记录是制造精确的Cerec修复体的关键组成部分。这项研究评估了使用不同相机，替代粉末材料和多种图像捕获序列制造的Cerec陶瓷冠的边缘适配性和内部适应性。使用聚乙烯硅氧烷（PVS）印有全陶瓷的Typodont印模制作了主环氧树脂模型牙齿14上的牙冠准备。使用二氧化钛粉末/机械喷雾器和气溶胶对比喷雾器产生均匀反射的表面。红外激光Cerec 3 / RedCam单元和LED Cerec AC / BlueCam单元用于记录图像以制造冠。执行了三个不同的图像捕获序列以记录数据。使用带有V3.80软件的Cerec AC装置为每个测试组制作冠状图。冠是从IPS EmpressCAD块铣削而成的。用测量显微镜在20倍下评估边缘对牙冠的适应性和牙冠对制剂主模型的内部适应性。使用双向方差分析对数据进行分析，在任何测试组之间的边缘拟合，轴向壁适应或咬合壁适应均未发现显着差异（p <0.05）。使用以下材料制造的Cerec CAD / CAM陶瓷冠的边缘配合和内部适配之间没有显着差异：1）红外激光照相机（RedCam）和LED照相机（BlueCam），2）二氧化钛粉末或气溶胶对比喷雾，或3）用于记录准备和邻近牙齿的多个成像序列。

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