title: Retrospective clinical study and survival analysis on partial ceramic crowns: results up to 7 years.
abstract: The purpose of the present study was to determine retrospectively the clinical performance of 42 all-ceramic partial crowns (PCCs) placed during the past 7 years. All patients (n = 25) with partial ceramic crowns (n = 49) placed by one experienced dentist between 1992 and 1999 were asked to take part in a clinical study, and 22 patients with 42 restorations agreed to do so. All partial ceramic crowns studied were fabricated using the IPS-Empress I all-ceramic system (Vivadent). The following luting composites were used for placing the restorations: 20 (47.6%) Variolink high viscosity (Vivadent), 3 (7.1%) Variolink ultra (Vivadent), 17 (40.5%) Dual Zement (Vivadent), and 2 (4.8%) Compolute (Espe). The partial ceramic crowns were examined clinically using the modified USPHS criteria. Of the 42 restorations, 40 (95.2%) were still in function without any need of replacement. One restoration (2.4%) had failed before starting the clinical study, and another one (2.4%) fractured during the study. Twenty-eight (66.7%) of the partial ceramic crowns evaluated were rated Alpha with respect to marginal adaptation. Twelve (28.6%) restorations were rated Bravo, no Charlie ratings were found and 2 (4.7%) restorations were rated Delta. The Kaplan-Meier analysis was used to calculate the survival rate. The probability of survival (95% confidence interval) for 7 years was 81% (66-96%). These data indicate that partial ceramic crowns may provide successful esthetic restorations in posterior teeth.
authors.affiliation: Department of Operative Dentistry and Periodontology, Dental School, University of Regensburg, 93053 Regensburg, Germany. astrid.felden@klinik.uni-regensburg.de
authors.forename: A
authors.initials: A
authors.lastname: Felden
authors.forename: G
authors.initials: G
authors.lastname: Schmalz
authors.forename: K A
authors.initials: KA
authors.lastname: Hiller
mesh_terms: D000328:Adult; D000368:Aged; D000538:Aluminum Silicates; D001641:Bicuspid; D003188:Composite Resins; D003442:Crowns; D001840:Dental Bonding; D003738:Dental Cements; D018772:Dental Marginal Adaptation; D003776:Dental Porcelain; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008963:Molar; D019279:Resin Cements; D012189:Retrospective Studies; D016019:Survival Analysis
chemical_list: D000538:Aluminum Silicates; C418025:Compolute; D003188:Composite Resins; D003738:Dental Cements; C121781:Dual Zement; C075815:IPS-Empress ceramic; D019279:Resin Cements; D003776:Dental Porcelain; C103502:Variolink