Objectives: This prospective clinical trial aimed at evaluating the clinical perfomance of tooth-supported three-unit posterior zirconia FPDs after 5 years of clinical function. Methods: Thirty-seven patients received 48 3-unit zirconia-based (Procera, NobelBiocare) FPDs. The restorations replaced either a premolar or a molar. Specific inclusion criteria were needed. Tooth preparation was standardized: 2mm occlusal reduction, 1.5mm axial reduction and circumferential chamfer shoulder placed 0.5 mm subgingivally buccally and supragingivally lingually on sound tooth structure; all internal angles were rounded. Impressions were made with polyethers (3M ESPE). CAD-CAM frameworks (Procera, NobelBiocare) with 9mm2 connector and 0.6mm retainer were made. The restorations were luted with resin cement (RelyXUnicem, 3M ESPE). The patients were recalled after 1, 6, 12, 24, 36, 48 and 60 months. Survival and success of ceramics and zirconia were evaluated. The technical and esthetic outcomes were examined using USPHS criteria. The biologic outcomes were analyzed at abutment and contralateral teeth. Modified Ryge criteria were used to assess marginal adaptation and discoloration. Descriptive statistics were performed (Kaplan-Meier, Wilcoxon). Results: All FPDs completed the study, resulting in 100% cumulative survival rate and 93.75% cumulative success rate. No losses of retention were recorded. Forty-two restorations were rated Alpha in all measured parameters. Minor chipping of ceramics was detected in 3 restorations. Three restorations were rated Bravo for marginal integrity at 5 years. No significant differences between the periodontal parameters of the test and control teeth were observed. As to esthetics, 44 restorations were rated Alpha and 4 were rated Bravo by both the clinicians and the patients either at baseline and 5-year follow-up. Conclusions: Five-year clinical results proved that 3-unit posterior zirconia-based FPDs were successful in the medium-term. This type of restoration may be considered reliable to replace a missing tooth.

Clinical performance of three-unit zirconia-based FPDs: five-year prospective clinical study

TETE', Stefano;
2010-01-01

Abstract

Objectives: This prospective clinical trial aimed at evaluating the clinical perfomance of tooth-supported three-unit posterior zirconia FPDs after 5 years of clinical function. Methods: Thirty-seven patients received 48 3-unit zirconia-based (Procera, NobelBiocare) FPDs. The restorations replaced either a premolar or a molar. Specific inclusion criteria were needed. Tooth preparation was standardized: 2mm occlusal reduction, 1.5mm axial reduction and circumferential chamfer shoulder placed 0.5 mm subgingivally buccally and supragingivally lingually on sound tooth structure; all internal angles were rounded. Impressions were made with polyethers (3M ESPE). CAD-CAM frameworks (Procera, NobelBiocare) with 9mm2 connector and 0.6mm retainer were made. The restorations were luted with resin cement (RelyXUnicem, 3M ESPE). The patients were recalled after 1, 6, 12, 24, 36, 48 and 60 months. Survival and success of ceramics and zirconia were evaluated. The technical and esthetic outcomes were examined using USPHS criteria. The biologic outcomes were analyzed at abutment and contralateral teeth. Modified Ryge criteria were used to assess marginal adaptation and discoloration. Descriptive statistics were performed (Kaplan-Meier, Wilcoxon). Results: All FPDs completed the study, resulting in 100% cumulative survival rate and 93.75% cumulative success rate. No losses of retention were recorded. Forty-two restorations were rated Alpha in all measured parameters. Minor chipping of ceramics was detected in 3 restorations. Three restorations were rated Bravo for marginal integrity at 5 years. No significant differences between the periodontal parameters of the test and control teeth were observed. As to esthetics, 44 restorations were rated Alpha and 4 were rated Bravo by both the clinicians and the patients either at baseline and 5-year follow-up. Conclusions: Five-year clinical results proved that 3-unit posterior zirconia-based FPDs were successful in the medium-term. This type of restoration may be considered reliable to replace a missing tooth.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11564/363511
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