A retrospective study on the incidence of chipping of zirconia-based restorations

摘要

The purpose of the paper was to establish the incidence of chipping of zirconia-based restorations, either implant or tooth supported in a retrospective study. Sixty patients received 222 cemented units of zirconia-based restorations. One hundred thirteen units were cemented on teeth, 97 on implants and 12 units were pontics. After the delivery of the restorations, during the recalls, the patients were examined in regard to the presence of chipping of the veneering ceramic. Location of the restoration, the type of support and the design of the restoration were assessed as possible factors influencing chipping rate. During an observation period of up to 5,5 years, 27 (12,16%) zirconia-based units showed chipping of the veneering ceramic. A total of 14 units had to be remade, resulting in a survival rate of 93,69% of the zirconia-based restorations. The chipping rate seemed to be higher in restorations on implants than those supported by teeth. In the molar region chipping occured twice as often as in the premolar and front regions (15,83% vs 7,84%). An increased chipping rate was observed in multi-unit restorations (13,95%) as compared to single-unit restorations (9,67%). Chipping of the porcelain veneering is the most frequent complication of zirconia-based restorations. They should be recommended with care in the molar region, especially as multi-unit restorations.