Pinar Kursoglu1, Pelin F Karagoz Motro2, Ender Kazazoglu3. 1. Associate Professor, Department of Prosthodontics, Faculty of Dentistry, Yeditepe University, Goztepe, Istanbul, Turkey. Electronic address: pinar.kursoglu@gmail.com. 2. PhD student, Department of Prosthodontics, Faculty of Dentistry, Yeditepe University, Goztepe, Istanbul, Turkey. 3. Professor, Department of Prosthodontics, Faculty of Dentistry, Yeditepe University, Goztepe, Istanbul, Turkey.
Abstract
STATEMENT OF PROBLEM: Stainability is an important factor in the long-term clinical success of ceramic restorations. Contour adjustments on restoration surfaces cause differences in ceramic texture that may be affected differently by the staining agent. PURPOSE: The purpose of this study was to evaluate the surface texture obtained by different surface treatments relevant to the stainability of heat-pressed leucite-reinforced ceramic disk-shaped specimens. MATERIAL AND METHODS: Sixty-six ceramic disks (IPS Empress Esthetic) (15 × 2 mm) were prepared, glazed, and then assigned to 6 groups. All disks were abraded with a diamond rotary cutting instrument except group GG (control), which was not subjected to any procedure. Group R (rotary diamond cutting instrument) was left untreated after abrasion. Group PB was polished with an abrasive stone, a round polishing brush, and paste with felt wheels. Group PU was polished with 1.0- to 0.5-μm polishing pastes with a goat-hair brush. Group PS was polished with abrasive stone, silicon carbide polishers, and polishing paste with polishing disks. Group GR was reglazed. Surface roughness was measured with a profilometer and evaluated with scanning electron microscopy. A spectrophotometer was used before and after 12 days of immersion in a coffee solution to assess color difference. Data were analyzed by 1-way ANOVA, the Tukey honestly significant difference test, and the Pearson rank correlation tests (α=.05). RESULTS: Ra values of groups from highest to lowest were, in order, R, PB, PU, PS, GR, and GG (P<.01). Scanning electron microscope images and Ra values were compatible. The color difference (ΔE) values of groups from highest to lowest were, in order, R, PB, PU, PS, GR, and GG. A positive significant relationship of 65.6% between the Ra and ΔE values was found (P<.01). CONCLUSIONS: Ceramic staining may be related to surface texture. The use of appropriate polishing materials with compatible porcelain may reduce stainability.
STATEMENT OF PROBLEM: Stainability is an important factor in the long-term clinical success of ceramic restorations. Contour adjustments on restoration surfaces cause differences in ceramic texture that may be affected differently by the staining agent. PURPOSE: The purpose of this study was to evaluate the surface texture obtained by different surface treatments relevant to the stainability of heat-pressed leucite-reinforced ceramic disk-shaped specimens. MATERIAL AND METHODS: Sixty-six ceramic disks (IPS Empress Esthetic) (15 × 2 mm) were prepared, glazed, and then assigned to 6 groups. All disks were abraded with a diamond rotary cutting instrument except group GG (control), which was not subjected to any procedure. Group R (rotary diamond cutting instrument) was left untreated after abrasion. Group PB was polished with an abrasive stone, a round polishing brush, and paste with felt wheels. Group PU was polished with 1.0- to 0.5-μm polishing pastes with a goat-hair brush. Group PS was polished with abrasive stone, silicon carbide polishers, and polishing paste with polishing disks. Group GR was reglazed. Surface roughness was measured with a profilometer and evaluated with scanning electron microscopy. A spectrophotometer was used before and after 12 days of immersion in a coffee solution to assess color difference. Data were analyzed by 1-way ANOVA, the Tukey honestly significant difference test, and the Pearson rank correlation tests (α=.05). RESULTS: Ra values of groups from highest to lowest were, in order, R, PB, PU, PS, GR, and GG (P<.01). Scanning electron microscope images and Ra values were compatible. The color difference (ΔE) values of groups from highest to lowest were, in order, R, PB, PU, PS, GR, and GG. A positive significant relationship of 65.6% between the Ra and ΔE values was found (P<.01). CONCLUSIONS: Ceramic staining may be related to surface texture. The use of appropriate polishing materials with compatible porcelain may reduce stainability.