IADR Abstract Archives
Long-term Clinical Outcome of Zirconia Ceramic Inlay-Retained FDPs
Objectives: To evaluate the long-term clinical outcome of inlay-retained fixed dental prostheses (IRFDPs) with a new design made from zirconia ceramic after an observation period of 10 years.
Methods: Thirty 3-unit IRFDPs were placed in thirty patients replacing 7 second premolars (4 in the maxilla, 3 in the mandible) and 23 first molars (15 in the maxilla, 8 in the mandible). Abutment preparations were performed in accordance with general principles for ceramic inlay restorations and modified with a short retainer-wing bevel preparation within the enamel at the buccal and lingual sides, with the aim to improve stress distribution, as well as to increase the adhesive bonding surface. The frameworks were scanned and milled out of zirconia ceramic (Vita In-Ceram YZ, Vita Zahnfabrik) using the InLab CAD/CAM-system (Sirona), and the pontics were veneered with feldspathic ceramic. After 50 µm alumina particle air-abrasion of the ceramic bonding surfaces at 0.25 MPa pressure, IRFDPs were luted adhesively with composite resin (Panavia 21, Kuraray). Clinical follow-up examinations were performed annually. Statistical analysis was performed using descriptive statistics and Kaplan-Meier survival analysis.
Results: The mean observation time was 104.9±31.6 months (minimum 15, maximum 150.4). After 10 years, the cumulative survival rate was 87.1% (Fig. 1), as three IRFDPs failed (one due to repeated debonding because of bruxism, one due to caries, and one due to general progressive periodontitis). Debonding was reported for three IRFDPs (10 year debonding rate 11.8%), one of them failed finally after 49.4 months and two were successfully rebonded. Five patients were regarded as drop-out because they did not attend the recall program for more than 24 months. Chipping of the veneering ceramic was reported in five cases, which were repaired or polished intraorally (10-year chipping rate 24.4%). Twenty-two RBFDPs were free of any kind of complication reporting thus a cumulative success rate of 66.5% after 10 years.
Conclusions: The clinical outcome of zirconia ceramic IRFDPs constructed in the modified design after 10 years is promising. Therefore, this novel design can be recommended as a treatment modality to replace a missing posterior tooth.
Methods: Thirty 3-unit IRFDPs were placed in thirty patients replacing 7 second premolars (4 in the maxilla, 3 in the mandible) and 23 first molars (15 in the maxilla, 8 in the mandible). Abutment preparations were performed in accordance with general principles for ceramic inlay restorations and modified with a short retainer-wing bevel preparation within the enamel at the buccal and lingual sides, with the aim to improve stress distribution, as well as to increase the adhesive bonding surface. The frameworks were scanned and milled out of zirconia ceramic (Vita In-Ceram YZ, Vita Zahnfabrik) using the InLab CAD/CAM-system (Sirona), and the pontics were veneered with feldspathic ceramic. After 50 µm alumina particle air-abrasion of the ceramic bonding surfaces at 0.25 MPa pressure, IRFDPs were luted adhesively with composite resin (Panavia 21, Kuraray). Clinical follow-up examinations were performed annually. Statistical analysis was performed using descriptive statistics and Kaplan-Meier survival analysis.
Results: The mean observation time was 104.9±31.6 months (minimum 15, maximum 150.4). After 10 years, the cumulative survival rate was 87.1% (Fig. 1), as three IRFDPs failed (one due to repeated debonding because of bruxism, one due to caries, and one due to general progressive periodontitis). Debonding was reported for three IRFDPs (10 year debonding rate 11.8%), one of them failed finally after 49.4 months and two were successfully rebonded. Five patients were regarded as drop-out because they did not attend the recall program for more than 24 months. Chipping of the veneering ceramic was reported in five cases, which were repaired or polished intraorally (10-year chipping rate 24.4%). Twenty-two RBFDPs were free of any kind of complication reporting thus a cumulative success rate of 66.5% after 10 years.
Conclusions: The clinical outcome of zirconia ceramic IRFDPs constructed in the modified design after 10 years is promising. Therefore, this novel design can be recommended as a treatment modality to replace a missing posterior tooth.
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