Load-bearing capacity of four-unit bridges with zirconia or metal frameworkZirconia frameworks for all-ceramic bridges were produced by different copymilling procedures and frameworks for porcelain-fused-to-metal bridges were cast in Co-Cr alloy. In load tests after veneering, all-ceramic bridges primarily failed by fractures of the framework, whereas the porcelain-fused-to-metal bridges failed by chipping and delamination. No significant differences were found between both types of bridges with respect to their load-bearing capacity under clinical aspects.

Precision of fit of indirect class II composite inlays built on silicone modelsThis in vitrostudy compares manual production to CAD / CAM production of indirect composite inlays. Each 10 inlays were built for both groups and were adapted into a cavity of an artificial metal tooth. Silicone replicas of the cement gaps were made. The thicknesses of these replicas were measured using a light reflecting microscope. It could be shown that the precision of the inlays which were manually produced was significally better (p < 0,001) than the precision of the CAD / CAM inlays.