CAD/CAM-Technique in Restorative Dentistry / CEREC - Pt. 3: Optical Impression and 3D Reconstruction on the Computer

CAD/CAM in Restorative Dentistry is introduced in this series by Dr. Alessandro Devigus, Switzerland. In part 3 he illustrates how the digital scanning is done and the construction of the restauration is computerised. CEREC-liquid is applied over the preparation and the adjacent teeth consisting of polysorbate increasing the stickiness of the tooth and allowing easy removal of the following contrast agent. Due to that titanium oxide powder is added creating a layer all over the cavity and the adjacent teeth sticking on the liquid. The optical impression for the CAD/CAM-treatment is performed with the CEREC AC digital impression system.

The camera operates with the Bluecam technology. The scanner uses blue light emitting diodes (LEDs) with short wavelength providing better contrasts to portrait details accurately. The cavity and the surfaces of the adjacent teeth are scanned to get an absolute representation of the prepared tooth. The contrast medium is easily removed with waterspray. The occlusion can be recorded by scanning a bite registration with wax proving a sufficient interocclusal clearance for the restoration. Contrast medium is also applied on this registration to enable the scan of the antagonistic information. With the optical data a 3D virtual model of the cavity is created on the computer. Now Dr. Devigus verifies the digital preparation and the insertion direction on the screen controlling undermining areas.

The preparation margin can be visualized and marked automatically or manually using a mouse. The CAD/CAM-technology offers digital morphing to achieve a biogeneric creation of the restoration fitting to the individual anatomy. Material can be smoothened, removed or added virtually to an ideal with computerized tools. The occlusal situation and the thickness of the ceramic can be controlled with digital on-screen articulating paper. The Computer added manufacturing (CAM) of the restoration can be carried out in-office or the digital images can be sent to a laboratory, where the restoration is milled or a conventional model is created for traditional fabrication. See more basic information for digital restorative dentistry with Dr. Alessandro Devigus in module 1, 2 and 4 presenting a predictable strategy for all-ceramic restorations with CAD/CAM.

CAD/CAM-Technique in Restorative Dentistry / CEREC - Pt. 3: Optical Impression and 3D Reconstruction on the Computer

CAD/CAM in Restorative Dentistry is introduced in this series by Dr. Alessandro Devigus, Switzerland. In part 3 he illustrates how the digital scanning is done and the construction of the restauration is computerised. CEREC-liquid is applied over the preparation and the adjacent teeth consisting of polysorbate increasing the stickiness of the tooth and allowing easy removal of the following contrast agent. Due to that titanium oxide powder is added creating a layer all over the cavity and the adjacent teeth sticking on the liquid. The optical impression for the CAD/CAM-treatment is performed with the CEREC AC digital impression system.

The camera operates with the Bluecam technology. The scanner uses blue light emitting diodes (LEDs) with short wavelength providing better contrasts to portrait details accurately. The cavity and the surfaces of the adjacent teeth are scanned to get an absolute representation of the prepared tooth. The contrast medium is easily removed with waterspray. The occlusion can be recorded by scanning a bite registration with wax proving a sufficient interocclusal clearance for the restoration. Contrast medium is also applied on this registration to enable the scan of the antagonistic information. With the optical data a 3D virtual model of the cavity is created on the computer. Now Dr. Devigus verifies the digital preparation and the insertion direction on the screen controlling undermining areas.

The preparation margin can be visualized and marked automatically or manually using a mouse. The CAD/CAM-technology offers digital morphing to achieve a biogeneric creation of the restoration fitting to the individual anatomy. Material can be smoothened, removed or added virtually to an ideal with computerized tools. The occlusal situation and the thickness of the ceramic can be controlled with digital on-screen articulating paper. The Computer added manufacturing (CAM) of the restoration can be carried out in-office or the digital images can be sent to a laboratory, where the restoration is milled or a conventional model is created for traditional fabrication. See more basic information for digital restorative dentistry with Dr. Alessandro Devigus in module 1, 2 and 4 presenting a predictable strategy for all-ceramic restorations with CAD/CAM.

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