Dynamic and Cyclic Fatigue Testing of Esthetic Single Tooth Implant Restorations

摘要

Conventional single tooth implant restorations can be unesthetic at the gingival level if they exhibit metal collars or are limited by the cylindrical shapes of the implants. Important mechanical properties of novel restorations with more esthetic features are unknown. The purpose of this investigation was to determine the elastic limit and mode of failure for four types of esthetic single tooth implant restorations and to determine the fatigue performance of these restorations. CerAdapt (CA), CeraOne (CO), and two types of non-segmented cast titanium restorations (MC and MA) were first subjected to dynamic loading to failure with an Instron machine. Four more groups were subjected to cyclic fatigue loading for 10(exp 6) cycles. For dynamic loading, the elongation at break was significantly lower for the all ceramic restoration (CA); there were no other statistically significant differences. CA failed catastrophically in the ceramic; all others failed in the abutment screw. For cyclic loading, all four groups withstood 106 cycles. The low fusing ceramic used for the cast titanium restorations exhibited a high incidence of crazing. After cyclic loading, the cast titanium restorations with margins coronal to the implant table (MC) were significantly more mobile than the other three groups. The unique cast non-segmented restorations presented in this study (MA) demonstrated comparable mechanical characteristics to the prefabricated restorations. Additional work needs to be done to improve the durability of low- fusing porcelain for titanium application. Extending the margin of a cast non- segmented restoration to the apical edge of the implant table allows more distance to create a natural emergence profile in the esthetically critical anterior region of the mouth.