IADR Abstract Archives
Survival of zirconia crowns: An up to 4-year clinical evaluation
Objectives: To evaluate success and survival of monolithic zirconia crowns delivered by predoctoral dental students at Faculty of Dentistry, University of Toronto. In addition, the effect of patient and operator related attributes on crowns’ longevity were assessed.
Methods: Patients who received posterior zirconia crowns at the Faculty of Dentistry, University of Toronto provided by pre-doctoral students, were invited for a follow up examination performed according to the modified California Dental Association criteria. Evaluation was performed by two independent examiners and included clinical and radiographic assessments, and intraoral photographs. Patients’ satisfaction with crown esthetics and function was recorded using visual analog scale. Biological, technical and esthetic complications were recorded. Survival and success rates were calculated using Kaplan-Meier analysis. Log rank test was used to assess significance of type of cement, tooth location and vitality status of teeth on crown success.
Results: A total of 116 participants (52 males and 64 females, mean age 56.35 years, range 28 to 83 years) participated in this study. One hundred and thirty seven crowns were evaluated (61 premolars and 76 molars). Panavia-SA cement was used in 113 cases and Rely-X Unicem cement was used in 24 cases. The mean follow-up time was 41 months (minimum= 29 months, maximum= 47 months). Five crowns presented with complications (3.62%). The most common complication was recurrent caries (2.89 %) followed by endodontic complication (0.72%). No loss of retention or material fracture were observed. The success rate of monolithic zirconia crowns after 47 months follow-up was 93.7% and the survival rate was 100%.
Conclusions: High survival and success rates reported in the present study suggests that monolithic zirconia is a predictable option for full coverage restoration in posterior teeth.
Methods: Patients who received posterior zirconia crowns at the Faculty of Dentistry, University of Toronto provided by pre-doctoral students, were invited for a follow up examination performed according to the modified California Dental Association criteria. Evaluation was performed by two independent examiners and included clinical and radiographic assessments, and intraoral photographs. Patients’ satisfaction with crown esthetics and function was recorded using visual analog scale. Biological, technical and esthetic complications were recorded. Survival and success rates were calculated using Kaplan-Meier analysis. Log rank test was used to assess significance of type of cement, tooth location and vitality status of teeth on crown success.
Results: A total of 116 participants (52 males and 64 females, mean age 56.35 years, range 28 to 83 years) participated in this study. One hundred and thirty seven crowns were evaluated (61 premolars and 76 molars). Panavia-SA cement was used in 113 cases and Rely-X Unicem cement was used in 24 cases. The mean follow-up time was 41 months (minimum= 29 months, maximum= 47 months). Five crowns presented with complications (3.62%). The most common complication was recurrent caries (2.89 %) followed by endodontic complication (0.72%). No loss of retention or material fracture were observed. The success rate of monolithic zirconia crowns after 47 months follow-up was 93.7% and the survival rate was 100%.
Conclusions: High survival and success rates reported in the present study suggests that monolithic zirconia is a predictable option for full coverage restoration in posterior teeth.
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