Abstract
Selection Criteria
An electronic search was conducted up to December 25, 2017, in the PubMed, Embase, and Cochrane library databases. Only clinical trials that were published in English with follow-up periods of 6 months or more are selected. Clinical trials that investigated the effect of veneered zirconia or implant-supported zirconia or those including participants with bruxism were excluded.
Two reviewers independently screened the title and abstract and performed data extraction of relevant articles; any disagreement was addressed by discussion.
No quality assessment for the risk of bias was performed. The meta-analysis was not conducted because of substantial clinical variation of the included trials.
Key Study Factor
The key study factor was the effect of tooth-supported monolithic zirconia crowns on the antagonist enamel wear. Two articles were randomized clinical trials and the other 3 were prospective nonrandomized trials. The 5 studies involved a total of 74 participants treated with monolithic zirconia posterior crowns. In 4 trials, the crowns were just polished, but in 1 trial, they were glazed. No meta-analysis was conducted because of great variations between the included studies.
Main Outcome Measure
The enamel wear of the antagonist's tooth.
Main Results
Of 21 eligible articles, 5 articles were included in this review and 16 articles were excluded. The results of included studies showed the antagonist enamel wear of zirconia was less than that of metal ceramics but more than that of natural tooth. The wear of molars is greater than that of premolars.
Conclusion
The studies showed that the wear of antagonistic enamel surfaces by polished zirconia was less than that produced by metal-ceramic restoration.