Premium
Evaluation of Zirconia‐Based All‐Ceramic Single Crowns and Fixed Dental Prosthesis on Zirconia Implants: 5‐Year Results of a Prospective Cohort Study
Author(s) -
Spies Benedikt Christopher,
Stampf Susanne,
Kohal RalfJoachim
Publication year - 2015
Publication title -
clinical implant dentistry and related research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.338
H-Index - 85
eISSN - 1708-8208
pISSN - 1523-0899
DOI - 10.1111/cid.12203
Subject(s) - medicine , dentistry , cubic zirconia , prosthesis , cohort , implant , dental prosthesis , prospective cohort study , orthodontics , ceramic , surgery , materials science , composite material
Objective The objective of this 5‐year cohort investigation was to determine the survival and success rate of all‐ceramic reconstructions on zirconia oral implants. Material and Methods Ninety‐three patients received 122 one‐piece zirconia implants. One hundred seventeen implants were restored with 63 single crowns ( SC s) and 27 three‐unit bridges (fixed dental prostheses, FDP s) fabricated using zirconia frameworks ( P rocera® Z irconia, N obel B iocare®, Göteborg, Sweden) hand‐layered with a silicate ceramic ( N obel R ondo™ Z irconia, N obel Biocare®). With any occurrence of chipping regarded as an event, K aplan‐ M eier success curves were plotted. Covariates (gender, location, manufacturing date) were estimated by the use of log‐rank tests. Results Eighty‐nine patients received prosthetic reconstructions. Sixty‐three of them were seen at the 5‐year follow‐up, with a mean observation time of 58.2 months (47 patients with SC s, 16 patients with FDP s). Reasons for the decreasing number of patients at the follow‐up sessions included dropouts due to implant loss ( n = 21), moving ( n = 3), missed appointments ( n = 1), and severe illness ( n = 1). Over half of the SC s (57.2%) and 38% of the FDP s were successful after an observation time of 5 years (overall success rate of 51.7%). The performed log‐rank tests revealed no statistically significant differences for the success curves regarding the above‐mentioned covariates. Among the 63 restorations that completed the study, 11 of 47 SC s and one of 16 FDP s had to be replaced due to the severity of the observed chipping. This results in survival rates of 76.6% for the SC s and 93.8% for the FDP s. No framework fractures or decementations were observed in any group. Conclusion Hand‐layering of zirconia‐based SC s and FDP s with N obel R ondo™ Z irconia restoring one‐piece zirconia implants did not show acceptable survival and success rates. Meanwhile, the material has been recalled from the market. It is advised that new materials should undergo adequate preclinical evaluation before coming to the market.