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These studies are often based on a relatively modest study size and are normally carried out in dental practices affiliated with a university, which may give a somewhat skewed conception of an ordinary, typical patient group.The aim of this three-year retrospective follow-up study was to evaluate the success and survival rates of a large number of ceramic-veneered zirconia FDPs in private practices, manufactured from the same materials with uniform methods.A few studies have been published on the clinical performance of zirconia restorations.For single crowns, Groten and Huttig have presented a 2-year survival rate of 98% . found a survival rate of 88.8% for 205 crowns , Güncü et al.All complications noted in the charts were registered and compared to definitions for success and survival and statistical analysis was performed using the Kaplan-Meier method and a Cox regression model. In total, 32 FDPs in 31 patients experienced some type of complication (17.4% of FDPs, 20.5% of patients). Two (1.1%) FDPs or 0.6% of units showed adhesive veneer fractures.Cohesive veneer fractures occurred in 10 (5.4%) FDPs (1.6% of units).Veneered zirconia has also been shown to be a durable and suitable alternative to conventional metal-ceramic, short-span restorations in the anterior and posterior regions [10–14].
The treating dentist conducted clinical follow-up examinations once a year for three years.
The phase transformation results in a volume increase in the stress zone, which hinders cracks from growing .
Compared to metal-ceramic (MC) FDPs, a zirconia restoration is more aesthetical.
The three-year cumulative success and survival rates (CSR) were 82.3% and 95.2%, respectively. Ceramic-veneered zirconia is a promising alternative to metal-ceramic FDPs, even in the posterior area.
However, the higher survival rate of metal-ceramic FDPs should be noted and both dentists and patients must be aware of the risks of complications.