Clinical performance of Ceramic Dental Crowns

INTERVENTION: E06.780.346 The study was planned as a prospective, double‐blinded, parallel, non‐inferiority, randomized clinical trial (RCT) in a university‐based setting. A convenience sample of patients who had received dental implants in the posterior maxilla or mandible, to replace missing premolars or molars, in the Dental Clinic at the University of Passo Fundo (UPF, Passo Fundo, RS, Brazil), and in need of rehabilitation with implant‐supported single crowns will be screened, and invited to participate in the study. Patients that followed the inclusion and exclusion criteria will be enrolled. Patients will be treated with ceramic implant‐supported single crowns using two different materials: 2nd generation zirconia (3Y; control) or the cubic‐containing multilayer graded zirconia (MULTI; experimental). A sample of 78 patients will be randomly allocated to either one of the two groups (n=39), according to a computer‐generated randomization list. Allocation to the study groups will be concealed by a person not involved in the study. The clinicians, the examiners, and the patients will not be aware of the different treatment groups. Before treating and evaluating the patients, all clinicians and examiners involved in the study will be trained and calibrated. Clinical outcomes will be collected at baseline and follow‐up periods of 6 months, 1, 2 and 3 years. CONDITION: C07.465 Tooth Loss; Tooth Wear PRIMARY OUTCOME: Similar technical complication rates of the implant‐supported single crowns are expected, through clinical evaluation, during a 3‐year period. SECONDARY OUTCOME: Similar biological complication rates of the implant‐supported single crowns are expected, through clinical evaluation, during a 3‐year period. Similar volume loss of the antagonist teeth/restorations is expected for the two groups using intraoral scanning procedures and software analysis after 3‐year follow‐up. INCLUSION CRITERIA: Volunteers that require tooth replacement with an implant‐supported single crown in one posterior quadrant in the maxilla or mandible; age from 18 to 70; good oral hygiene; periodontal health or successful periodontal therapy; at least one adjacent tooth/restoration; presence of antagonistic contacts