All-ceramic single crowns supported by zirconia implants: 5-year results of a prospective multicenter study.

Universitätsklinikum

Spies BC, Balmer M, Jung RE, Sailer I, Vach K, Kohal RJ

All-ceramic single crowns supported by zirconia implants: 5-year results of a prospective multicenter study.

Spies BC, Balmer M, Jung RE, Sailer I, Vach K, Kohal RJ: All-ceramic single crowns supported by zirconia implants: 5-year results of a prospective multicenter study. Clin Oral Implan Res, 2019; 30: 466-475. : https://doi.org/10.1111/clr.13433

Journal Articles

OBJECTIVES: To assess survival/success rates and patient-reported outcome of zirconia-based posterior single crowns (SCs) supported by zirconia implants in a prospective two-center study after five years of observation. MATERIAL AND METHODS: Forty-five patients were restored with 45 zirconia implant-supported posterior SCs composed of zirconia frameworks hand-layered with a leucite-reinforced feldspathic ceramic. Survival rates of SCs were assessed and technical success was evaluated according to modified United States Public Health Care (USPHS) criteria. Furthermore, patient-reported outcome measures (PROMs) were assessed by applying visual analog scales (VAS). Wilcoxon matched-pairs signed-rank test, mixed-effects ordered logistic regression, and linear mixed models were used to evaluate time effects on response variables. RESULTS: Forty patients were available after a mean observation period of 61.0 ± 1.4 months. One SC had to be replaced, resulting in a Kaplan-Meier (KM) survival estimate for the SCs of 97.5 ± 2.47%. Since nine reconstructions showed at least in one category a major deviation from the ideal (five major chippings, four with increased occlusal roughness, one significant crevice, and one pronounced over-contouring), the KM success estimate was 79.3 ± 5.8%. Incidence of chipping (n = 19) and occlusal roughness (n = 35) was frequent (p < 0.001). All PROMs at prosthetic delivery except for speech (p = 0.139) showed significantly improved VAS scores (81%-94%; p < 0.001) compared to pre-treatment evaluations. Thereafter, no decrease in satisfaction could be observed until the 5-year follow-up (93%-97%). CONCLUSION: Veneered zirconia-based SCs supported by zirconia implants showed high survival rates and highly satisfied patients' needs. However, significant incidence of technical complications is compromising the clinical long-term outcome for this indication. © 2019 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd. KEYWORDS: CAD-CAM; ceramics; crown; dental implant; dental porcelain; zirconia

https://doi.org/10.1111/clr.13433