Abstract
This study evaluated the influence of zirconia surface finishes on the wear of an enamel analogue. 40 zirconia discs were divided into four groups: control (without finish); glazed; polished; polished and glazed. All samples were subjected to wear against steatite antagonists. The specimens underwent roughness, topographic, scanning electron microscopy (SEM) and wettability analyses. Quantitative wear measurements were performed on both steatites and discs. To measure wear of steatites the weight before and after the test and the diameter after the test were used. Profilometer measurements were performed to determine the wear on discs. Roughness, volumetric wear and mass loss were analyzed using the Kruskal-Wallis and Dunn tests (5%), while contact angle values were analyzed with One-way ANOVA and Tukey tests (5%). The polished group had the lowest roughness means, being statistically different from the other groups (p-value=0.0001). The glazed group presented the lowest steatite volumetric wear (p-value=0.0001), but not statistically different from the polished and glazed group, whereas these groups presented the highest zirconia volumetric wear, with statistically different (p-value=0.0002) compared to the others. SEM showed irregularities on the control groups surface, grooves on the polished group, and a homogeneous surface for the glazed group with a few pores. All groups presented contact angles lower than 90 degrees, characterizing hydrophilic surfaces. It can be concluded that just glazed zirconia caused less wear on the antagonist when compared to no finish and polished zirconia.
Highlights
Wear in the dental structure is a natural process that occurs by contact and friction between opposing teeth, which can be accelerated when a natural tooth is in contact with restorative materials [1]
The null hypothesis was rejected under the tested conditions, since glazed surface finish caused less wear on the antagonist, whereas the polished group or no finish caused more wear
The attrition between the dental enamel analogue and the zirconia was simulated in a sliding mechanical cycling machine, with the zirconia submitted to different surface finishes
Summary
Wear in the dental structure is a natural process that occurs by contact and friction between opposing teeth, which can be accelerated when a natural tooth is in contact with restorative materials [1]. In testing different polishing techniques on the zirconia surface, Chong et al [11] stated that it may wear off the enamel because of its hardness and coefficient of friction, and it is extremely important to polish the restoration after adjustments to minimize wear. Glazing is another option for finishing the monolithic zirconia surface, works show that it can be deleterious to the antagonist enamel [12,13]
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