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Monolithic lithium‐disilicate single crowns supported by zirconia oral implants: three‐year results of a prospective cohort study
Author(s) -
Spies Benedikt Christopher,
Patzelt Sebastian Berthold Maximilian,
Vach Kirstin,
Kohal RalfJoachim
Publication year - 2016
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.12716
Subject(s) - lithium disilicate , dentistry , implant , medicine , dental porcelain , cubic zirconia , survival rate , crown (dentistry) , orthodontics , materials science , ceramic , surgery , composite material
Objective To determine the survival and success rate of CAD / CAM ‐fabricated monolithic lithium‐disilicate crowns supported by zirconia oral implants after 3 years. Material and Methods Twenty‐four patients in need of a single tooth replacement received a zirconia implant and were finally restored with 24 single crowns ( SC s) ground out of pre‐crystallized lithium‐disilicate blanks. The restorations were adhesively cemented and evaluated using modified United States Public Health Service ( USPHS ) criteria. In case of clinically relevant defects that could be repaired to an acceptable level, SC s were regarded as surviving. Restorations with minor chippings, a small‐area roughness (ø <2 mm), slightly soundable marginal gaps, minimal under‐/overcontours, and tolerable color deviations (<1 Vitashade) were regarded as success. The Kaplan–Meier method and log‐rank tests were used for the success/survival analyses and the calculation of potential group differences (gender, location, jaw). Additionally, several patient‐reported outcome measures ( PROM s) were evaluated. Results Twenty‐three patients were seen 3 years after implant placement. No SC had to be replaced, resulting in 100% survival. No chippings were observed. As one SC showed a major occlusal roughness, the Kaplan–Meier success rate after a mean observation period of 31 months was 95.7%. No group differences could be calculated. Compared with the pre‐treatment surveys, the further PROM s showed a permanently improved perception of function, esthetics, sense, and speech. Conclusion Monolithic lithium‐disilicate SC s supported by zirconia implants showed promising survival and success rates after an observation period of 3 years. It remains to be seen whether the further observation period confirms this positive results.