Objectives: The purpose of this in-vivo study was to evaluate the clinical outcome of crown-retained anterior and posterior fixed partial dentures (FPDs) as well as inlay-retained FPDs made from a new hot-pressed lithia-disilicate glass-ceramic (Ivoclar-Vivadent, FL). Methods: Between September 1999 and November 2002 in total 82 restorations were placed in 70 patients: 6 anterior and 31 posterior FPDs after full-crown preparation and 45 inlay-retained FPDs were inserted. The crown-retained FPDs were cemented with glass-ionomer cement (Ketac-Cem, 3M Espe, FRG) or composite resin (Variolink II, Ivoclar-Vivadent), while all inlay-retained FPDs were cemented with composite resin (Variolink II). For crown abutment preparation a 0.8mm circumferential and 1.5mm occlusal reduction and a chamfer or shoulder margin design was applied. For inlay abutments teeth were prepared with a mesial-occlusal, occlusal-distal or mesio-occlusal-distal cavity. The minimum extension for the approximal connector for anterior FPDs was 4mm in height and 3mm in width (12mm˛) and for posterior FPDs and inlay-retained FPDs 4mm in height and 4mm in width (16mm˛). The recall intervals were performed 6-12 months, 2 years, 3 years after placement of the restorations. Statistical analyses of the results were made with Kaplan-Meier analysis and the Gehan-Wilcoxon test. Results: The mean observation time for crown-retained FPDs was 36.2 months and for inlay-retained FPDs it was 24.3 months. No crown-retained FPD failed during the observation period, while three inlay-retained FPD had to be replaced. The three-year survival rate according to Kaplan-Meier was 100% for crown-retained FPDs and 93.3 % for inlay-retained FPDs. The differences between the groups were not statistically significant (p=0.115). Conclusion: The clinical outcome of crown- and inlay-retained FPDs made from this new hot-pressed lithia-disilicate glass-ceramic is promising in the anterior and posterior region.

Supported by Ivoclar-Vivadent, FL.

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