Three-year clinical performance of cast gold vs ceramic partial crowns

Abstract

Cast gold partial crowns (CGPC) and partial ceramic crowns (PCC) are both accepted for restoring posterior teeth with extended lesions today. However, as esthetics in dentistry becomes increasingly important, CGPC are being progressively replaced by PCC. The aim of the present prospective split-mouth study was the comparison of the clinical performance of PCC and CGPC after 3 years of clinical service. Twenty-eight patients (11 men and 17 women) participated in the 3-year recall with a total of 56 restorations. In each patient, one CGPC (Degulor C) and one PCC (Vita Mark II ceramic/Cerec III) had been inserted at baseline. CGPC were placed using a zinc phosphate cement (Harvard); PCC were adhesively luted (Variolink II/Excite). All restorations were clinically assessed using modified US Public Health Service (USPHS) criteria at baseline, 1 year, 2 years, and 3 years after insertion. Twenty-eight CGPC and 14 PCC were placed in molars, and 14 PCC were placed in premolars. Early data were reported previously under the same study design. After 3 years, the evaluation according to USPHS criteria revealed no statistically significant differences between both types of restorations with the exception of marginal adaptation and marginal discoloration: A statistically significant difference within the PCC group (baseline/3 years) was determined for the criterion marginal adaptation. For the 3-year recall period, overall failure was 0% for CGPC and 6.9% for PCC. At 3 years, PCC meet American Dental Association Acceptance Guidelines criteria for tooth-colored restorative materials for posterior teeth.

All-ceramic partial coverage restorations—Midterm results of a 5-year prospective clinical splitmouth study

“…IPS Empress partial coverage restorations achieved survival rates of 92.7-100% in midterm (2-4 years) 26,29 and 81-93.4% in long-term evaluation (7 years). 22,36 The present survival rate obtained for the Cerec ProCAD partial coverage restorations can only be related to a 93.1% 3-year survival rate of Vita Mark II partial crowns 31 and to a 90-90.4% survival rate for Vita Mark I inlay and onlay restorations after 9-10 years. 37,38 The survival probability of onlays made of feldspathic ceramics was distinctively lower with 56-60.7% after an observation period of 6-7 years.…”

“…1,22,23 Preliminary results of all-ceramic partial coverage restoration in short and medium-term clinical observation are promising. [24][25][26][27][28][29][30][31] However, conclusive evidence-based statements on clinical longevity of extended partial coverage restorations cannot be made yet.…”

Controlled, prospective, randomized, clinical evaluation of partial ceramic crowns inserted with RelyX Unicem with or without selective enamel etching. Results after 2 years

“…The study design of this controlled, prospective, randomized clinical split-mouth study followed the requirements outlined in the American Dental Association (ADA) Acceptance Program Guidelines [19], the CONSORT Statement [20] as well as established and previously published protocols [17,21]. The study design of the present evaluation was approved by the ethics committee of the University of Regensburg (IRB no.…”

“…Today, clinical criteria for evaluation of direct and indirect restorations as revised by the World Dental Federation (FDI) in 2007 should be applied [29], including the requirement of two independent evaluators. In the present study, all restorations were evaluated by one experienced dentist who had been calibrated against an experienced senior investigator [17,21]. The reporting of the study complies with the CONSORT Statement [20].…”

“…In the present study, the CEREC restorations were machined indirectly using a cast to make it more convenient for the supervising operator to additionally control the preparation and the marginal fit of the milled restorations on the cast before placement. CAD/ CAM fabrication of ceramic inlays and PCC restorations is a scientifically accepted and well-documented treatment procedure [21,35,36].…”