Effect of simulated mastication on the surface roughness of three ceramic systems
| Autor: | Duygu Kürklü, Rafat Amer, William M. Johnston |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Ceramics
Hot Temperature Time Factors Materials science Vacuum Potassium Compounds Surface Properties Surface finish In Vitro Techniques medicine.disease_cause Dental Materials chemistry.chemical_compound Silicone Mold Materials Testing Surface roughness medicine Yttrium Cubic zirconia Ceramic Composite material Dental Enamel Enamel paint Dental Porcelain Dental Polishing Substrate (building) chemistry visual_art visual_art.visual_art_medium Computer-Aided Design Mastication Aluminum Silicates Zirconium Oral Surgery |
| Zdroj: | The Journal of Prosthetic Dentistry. 114:260-265 |
| ISSN: | 0022-3913 |
| Popis: | Statement of problem Zirconia complete coverage crowns are being widely used as restorations because of their high strength and improved esthetics. Data are sparse about the change in surface roughness of this ceramic material after repeated mastication cycles of opposing enamel. Purpose The purpose of this study was to investigate changes in the surface roughness after being subjected to 3-body wear-opposing human enamel of 3 types of ceramics: dense sintered yttrium-stabilized zirconia (Z); lithium disilicate (L); and a conventional low-fusing feldspathic porcelain (P) treated to impart a rough, smooth, or glazed surface. Material and methods Twenty-four specimens of each of the Z and L ceramic were sectioned from computer-aided design and computer-aided manufacturing blocks into rectangular plates (15×12×2 mm). Twenty-four specimens of the feldspathic porcelain were formed into disks (12-mm diameter) from powders compressed in a silicone mold. All specimens (n=72) were prepared according to the manufacturers' recommendations. Specimens of each ceramic group were placed into 1 of 3 groups: group R, rough surface finish; group S, smooth surface finish; and group G, glazed surface finish. A total of 72 specimens (9 groups with 8 specimens each) was placed in a 3-body wear simulator, with standardized enamel specimens (n=72) acting as the substrate. The changes in surface roughness of the ceramic specimens were evaluated after 50 000 cycles. Data were analyzed by a repeated measures 3-way ANOVA mixed procedure with the Satterthwaite method for degrees of freedom and maximum likelihood estimation of the covariance parameters (α=.05). Results Data showed that the PS group exhibited the largest change in surface roughness, becoming significantly rougher ( P P =.012). Conclusions The surfaces of monolithic zirconia ceramic and lithium disilicate did not become as rough as the surface of conventional feldspathic porcelain after enamel wear. |
| Databáze: | OpenAIRE |
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