Probability of Failure of Highly Filled Indirect Resin-Veneered Implant-Supported Restorations: An In Vitro Study
Yutaka Takahashi, DDS, PhD, Kazuhiro Hisama, DDS, PhD, Hironobu Sato, DDS, PhD, John Chai, BDS, MS, MJ, DLaw, Hiroshi Shimizu, DDS, PhD, Hirofumi Kido, DDS, PhD, Shinichi Ukon, DDS, PhD
Purpose: The study compared the probability of failure of three highly filled resin-veneered
restorations to that of conventional metal-ceramic restorations when used as implantsupported prostheses. The effect of the location of load application on the fracture resistance of the restorations was also studied. Materials and Methods: Twenty samples each of the three resins, Artglass, Targis, and Estenia, were applied on Type IV gold
frameworks. Twenty metal-ceramic restorations of equal dimensions (VMK 95 and Degudent Universal) were used as controls. Compressive load was applied vertically at 1 mm (n = 10) and 2 mm (n = 10) from the periphery of the occlusal table until the
restorations failed. Weibull analysis was applied to the data. Results: There was no significant difference in the probability of failure among the metal-ceramic restorations and three resin-veneered restoration systems. Loading the resin-veneered restorations at the 1-mm location significantly increased their probability of failure when compared to the 2-mm loading location. The loading location did not significantly change the probability of failure of the metal-ceramic restorations. Conclusion: The probability of failure of resin-veneered restorations tested was not significantly different from that of the metal-ceramic restoration
under two compressive loading conditions. Eccentric loading of resin-veneered restorations should be minimized in light of the higher probability of failure associated with such a loading condition. Int J Prosthodont 2002;15:179–182.