DEDICAM Product Catalog

72 DEDICAM Product Catalog 2019 QUALITY ADVANTAGE Interfering contacts, screw seat and vibratory grinding Detection of interfering contacts + milling: The CAD files detailing the directly screw-retained bars and bridges are analyzed in the manufacturing process (CAM software) for the angulati- on of the implant axes, among other things. A common insertion direc- tion is calculated here (image 3). Based on this insertion direction, the interfering contacts at the implant connections are removed individually in the case of major divergences of the implant axes (image 1). This procedure of detecting interfering contacts and their subsequent removal through milling (image 2) gives guidance and positioning the necessary freedom on the one hand, and ensures the stability of the implant connection on the other. Divergences in the implant axes of up to 50° to each other can be compensated in this way. The perfect fit of directly screw-retained bridges and bars on the im- plants is an important criterion for the durability of the restorations. In order to give a true representation of the implant connections, it may on the one hand be necessary to mill into adjacent basal sur- faces in case of major divergences in implant axes or for geometries located below the implant shoulder level (image 5). On the other hand, the intermediate area between very narrowly placed implants cannot be processed according to the CAD construction. Here, the material can subsequently be removed by the customer through ma- nual reworking with diameter-reduced milling cutters (image 6). Under these circumstances, the milled restoration may differ from the CAD file provided. Screw seat and vibratory grinding The surface design and vibratory grinding The screw seats in directly screw-retained bridges and bars are prepared with a special form cutter to achieve high contour accuracy and sur- face quality. This allows the screws to sit flat and minimizes the risk of screws becoming loose over the wearing period. Special attention is to be paid to the surface design of the bridges and bars. Next to the option of a precision milled structure, we therefore offer the version of high-gloss polishing with a virtually perfect result by employing the process of vibratory grinding performed 100 percent by machines. In this process, and with a covered implant connection, the milled construction is vibrated in a solution with special granules which results in uniform abrasion and finishing of the surface. Image 5 Image 1 Image 4 Image 6 Image 3 Image 2