Objective: To determine if Procera/All-Ceram crowns cemented with Relyx resin reinforced glass ionomer provide a viable option for patients with metal sensitivities & those who refuse use of metal in their treatment. Materials: Procera/All-Ceram (Noble Biocare/Ducera) & Relyx RRGI cement (3M). Methods: 59 single unit full coverage Procera/All-Ceram crowns were placed on vital molars in 54 patients by 19 practicing clinicians using standardized procedures for prep design & cementation according to manufacturer's directions. Standardized evaluations were performed using modified Ryge scales at initial placement, 6 months, 1 year, & 2 years. Criteria graded in-vivo were: color match, interproximal contact, caries, post-operative sensitivity, & gingival health. Criteria graded in-vitro were: surface smoothness, presence of pitting, presence of occlusal adjustments, breakage, & quantitative wear (CRA Measurement System. JDR 69:126 #140 ‘90). Statistical methods analyzing Procera/All-Ceram across time were Fisher's Exact Test, GLM, & Tukey's HSD (µ=.05). Results: Analyzed across time, significant criteria were: breakage & pitting. Non-significant criteria were: sensitivity, caries, surface smoothness, gingival health, color match, interproximal contacts & occlusal adjustment. 3% of Procera/All-Ceram exhibited bulk fractures; 23% exhibited small chips. The majority of small chips are found on marginal ridges. 85% exhibited surface pitting. At the 2-year recall, 100% of the copings were intact & 100% of the crowns remained cemented. 86% required occlusal adjustments after cementation, which affected surface smoothness adversely. Mean 2-year cumulative wear was 45mm. Conclusions: These data indicate Procera/All-Ceram full crowns cemented with Relyx RRGI can provide a viable treatment option for patients with metal allergies &/or concerned with metal use in their treatment.

Back to the Dental Materials: VIII - Others-Non-metallic Program
Back to the IADR/AADR/CADR 80th General Session (March 6-9, 2002)

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