Evaluation of zirconia-based posterior single crowns supported by zirconia implants: preliminary results of a prospective multicenter study.

摘要: OBJECTIVE The aim of this uncontrolled prospective multicenter study was to determine the success and survival rate posterior single crowns composed zirconia frameworks hand-layered with a leucite-reinforced feldspathic ceramic supported by one-piece oral implants. MATERIAL AND METHODS In two centers, sixty patients received 71 To obtain clear indication implant-supported (ISSCs), 14 (25 implants) were excluded from analysis (11 bridges, three anterior crowns). remaining provided implants in regions. As one patient lost his implant another refused further participation after final prosthesis insertion, 44 ISSCs/patients (19 females, 25 males) available for evaluation. Of these patients, all seen at prosthetic delivery 6- 12-month follow-up appointments. Evaluations performed using modified United States Public Health Service (USPHS) criteria. Restorations within Alpha Bravo ratings regarded as success. This included minor chippings, slight roughness, slightly soundable restoration margins minimal contour deficiencies. case more distinct defects that could, however, be repaired clinically acceptable level, restorations surviving. Kaplan-Meier plots log-rank tests used success/survival analyses calculation potential group differences (gender, jaw center). RESULTS After mean observation period 12.5 months (SD: 0.8 months), no ISSC had replaced, resulting 100%. 90.9% (one major chipping, obvious significant crevice pronounced over-contouring). Minor chippings occlusal roughness frequent complications. No significantly different survival/success rates could observed between mentioned groups. CONCLUSION incidence suggests high technique sensitivity when providing veneered zirconia-based questioning its suitability indication.