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Evaluation of zirconia‐based posterior single crowns supported by zirconia implants: preliminary results of a prospective multicenter study
Author(s) -
Spies Benedikt Christopher,
Kohal RalfJoachim,
Balmer Marc,
Vach Kirstin,
Jung Ronald E.
Publication year - 2017
Publication title -
clinical oral implants research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.407
H-Index - 161
eISSN - 1600-0501
pISSN - 0905-7161
DOI - 10.1111/clr.12842
Subject(s) - medicine , implant , dentistry , prosthesis , survival rate , dental porcelain , dental prosthesis , prospective cohort study , survival analysis , multicenter study , orthodontics , randomized controlled trial , surgery , ceramic , materials science , composite material
Objective The aim of this uncontrolled prospective multicenter study was to determine the success and survival rate of posterior single crowns composed of zirconia frameworks hand‐layered with a leucite‐reinforced feldspathic ceramic supported by one‐piece zirconia oral implants. Material and methods In two centers, sixty patients received 71 zirconia oral implants. To obtain a clear indication of posterior implant‐supported single crowns ( ISSC s), 14 patients (25 implants) were excluded from the analysis (11 bridges, three anterior crowns). The remaining patients were provided with single implants in posterior regions. As one patient lost his implant and another refused further participation after final prosthesis insertion, 44 ISSC s/patients (19 females, 25 males) were available for evaluation. Of these patients, all were seen at prosthetic delivery and the 6‐ and 12‐month follow‐up appointments. Evaluations were performed using modified United States Public Health Service ( USPHS ) criteria. Restorations within Alpha and Bravo ratings were regarded as success. This included minor chippings, a slight roughness, slightly soundable restoration margins and minimal contour deficiencies. In case of more distinct defects that could, however, be repaired to a clinically acceptable level, restorations were regarded as surviving. Kaplan–Meier plots and log‐rank tests were used for the success/survival analyses and the calculation of potential group differences (gender, jaw and center). Results After a mean observation period of 12.5 months ( SD : 0.8 months), no ISSC had to be replaced, resulting in a Kaplan–Meier survival rate of 100%. The Kaplan–Meier success rate was 90.9% (one major chipping, one obvious roughness, one significant crevice and one pronounced over‐contouring). Minor chippings and occlusal roughness were frequent complications. No significantly different survival/success rates could be observed between the mentioned groups. Conclusion The frequent incidence of minor chippings suggests a high technique sensitivity when providing zirconia implants with veneered zirconia‐based crowns questioning its suitability for this indication.