Alternative framework designs for zirconia-ceramic crowns

The strength of an all-ceramic restoration depends not only on the fracture resistance of the material, but also on a suitable preparation design with adequate material thickness. The objective of this study was to provide alternative framework designs of molar zirconia-ceramic crowns. A plaster die was replicated from a plastic maxillary right first molar prepared for all ceramic crowns. Three different framework designs were found to be possible to create using the soft of the CAD/CAM system. Framework design modifications have been suggested by the soft, in order to improve strength by providing support to veneering porcelain and also to improve aesthetics without compromising strength. Different framework designs for zirconia-ceramic crowns can be chosen in order to provide adequate support for the veneering material. Key-Words: zirconia-ceramic crown, molar, CAD/CAM, framework design, support.