CAD/CAM – international magazine of digital dentistry No. 1, 2018

| case report Chairside CAD/CAM immediate restorations Anterior no-preparation ultrathin veneers Drs Feng Liu & Xing Liu, China Fig. 1 Fig. 2 Fig. 1: No-preparation veneer is adapt to the teeth with flat surface. Fig. 2: When the teeth have apparent curvature, no-preparation veneer may have weak contact area. Micropreparation veneer is more appropriate. Introduction No-preparation ultrathin veneer is one of the most minimally invasive restorations. Its thickness ranges from 0.3 to 0.5 mm. In the right circumstances (Figs. 1 & 2) it can show excellent aesthetic appearance, and provide long-term stability and health of soft- and hard-tissue. The overall structure of ultrathin veneer is flexible, in that its neck can gradually change from thick to thin, and the border can be knife edge-like or thin round-convex (Figs. 3 & 4). Manufacturing inlays, onlays, crowns and veneers chairside with a CAD/CAM system has become estab- lished in most dental offices. This technique can produce immediate scan, design, milling and restoration quickly and conveniently. It is the same for the no-preparation ul- trathin veneer. For chairside CAD/CAM systems, CEREC is the most developed system. The biocopy mode, which is widely used for restoration design, has target contours such as wax-up. In this mode, the operator should scan the original tooth shape in the mouth or on the model first, then wax up and re-scan the wax-up shape into the CEREC system. Both optic im- pressions will transfer into the virtual model, and match to each other to obtain the restoration contour information. Depending on the 3-D data, chairside milling can be com- plete in few minutes. Post-milling processes usually con- tain shaping and polishing. In some conditions, it may be necessary for additional staining and glazing. Fig. 3 Fig. 4 Fig. 3: Ideal gradual thinning no-preparation veneer. Fig. 4: Acceptable round-convex no-preparation veneer margin with a little thickness. 16 CAD/CAM 1 2018

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