The effect of clinical polishing protocols on ceramic surface texture and wear rate of opposing enamel: a laboratory study.

Abstract

There has been a significant increase in the delivery of all ceramic restorations especially with the global explosion of CAD CAM technology. Frequently, the ceramic restorations require refinements to the surfaces with abrasives prior to or after cementation. If adjustments are made to a glazed or non-glazed surface after cementation, only mechanical polishing is an option to restore the surface texture. Surface roughness of ceramic restorations influences the aesthetics, functional and biological parameters of the restoration [1, 2]. A relatively rough surface can negatively influence the strength [3, 4] and longevity of a restoration [5, 6], increase friction [7] and rate of wear of the restoration [8] and opposing tooth structure [9], promote gingival inflammation [10], adverse soft tissue reactions [11], and the accumulation of stains and plaque on the surface [12-14]. Recent low fusing ceramics have properties which improve the surface characteristics and allows a relatively smoother surface to be achieved either by glazing or polishing [15, 16]. The aim of this study is to increase the understanding of the surface characteristics produced from either glazing or polishing and what impact the surface texture produced from such finishing methods has on the wear rate of opposing enamel. Clinically this will assist with decision making regarding the most effective method to achieve an optimal ceramic surface finish.