Natural teeth wear opposite to glazed and polished zirconia and feldsapathic crowns: A Systematic Review

Abstract

Background. It is a major concern to select a proper ceramic with good strength and acceptable esthetic with minimum antagonist natural tooth wear. Therefore different ceramics introduced to obtain these advantages with various surface treatments. The aim of this systematic review is to to evaluate and report the wear behavior of polished and glazed feldspathic and zirconia crowns in published articles up to October 2018.

Methods. Five electronic databases which were used in this research were MEDLINE (PubMed), Cochrane Library ,EMBASE and Scopus from the starting date of databases to October 2018 using keywords of “dental ceramic”, “enamel”, “wear,” and “feldspathic”, "zirconia","Y-TZP ","polished","glazed”. First, the terms “zirconia”, “feldspathic”,"dental ceramic",”enamel”,”Y-TZP” and “wear” were used, and within the results the terms “glazed” and "polished" were added. No publication year limits were applied during the electronic searches. English articles were selected in this paper. Related titles and abstracts were screened by two independent reviewers and after appraising of abstracts, potentially eligible articles were regained in full-text. The PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) Statement was used as a reporting template as much as possible.

Results. 132 articles were identified through database searching and one article was found through hand-searching by checking the refrences of included articles. Among the initially 133 articles, 59 articles were removed through duplication test, and finally 52 articles were screened and among them, only 16 articles remained for full-text regaining. The remained articles showed that zirconia groups had significantly less antagonist wear than feldspathic groups, and among the different surface treatments, polishing had less enamel wear than other types of surface treatment like glazing. Only one study showed that Glazed zirconia can have more antagonist wear than feldspathic porcelain.Monolithic zirconia had less enamel wear than conventional zirconia and low-fusing feldspathic porcelain showed lower antagonist wear in comparing with other types of feldspathic porcelains.

Conclusion. Antagonist wear is strongly material dependent and surface treatments like polishing can results in lower antagonist wear. Due to this fact, zirconia crowns showed lower enamel wear than feldspathic porcelains, and polishing surface treatment had the least antagonist wear among all other surface treatments, in both zirconia and feldspathic groups.