Effect of Ceramic Interposition and Post-activation Times on Knoop Hardness of Different Shades of Resin Cement
| Autor: | Américo Bortolazzo Correr, Simonides Consani, Moreno Mbp, Ana Rosa Costa, Sinhoreti Mac, Ambrosano Gmb, Correr L Sobrinho, Frederick A. Rueggeberg |
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| Rok vydání: | 2018 |
| Předmět: |
Ceramics
Curing Lights Dental Materials science medicine.medical_treatment Color 02 engineering and technology Elastomer Indentation hardness Polymerization 03 medical and health sciences 0302 clinical medicine Hardness medicine Ceramic Composite material General Dentistry Light exposure Resin cement Cement 030206 dentistry 021001 nanoscience & nanotechnology Resin Cements visual_art visual_art.visual_art_medium Knoop hardness test Veneer 0210 nano-technology |
| Zdroj: | Brazilian Dental Journal. 29:76-81 |
| ISSN: | 1806-4760 0103-6440 |
| DOI: | 10.1590/0103-6440201801635 |
| Popis: | The aim of this study was to evaluate Knoop hardness of different shades of a resin cement light-cured directly or through ceramic discs, measured 15 min or 24 h after light exposure, and at different depths. Specimens of a commercial resin cement (Variolink Veneer) in seven shades, were fabricated in an elastomeric mold, covered with a mylar strip, a 0.7 mm thick ceramic disc (IPS e.max Press) was placed and the cement was light-activated for 20 s using a blue LED (Radii-Cal). The cured resin cement specimens were transversely wet-flattened to their middle portion and microhardness (Knoop) values were recorded at 15 min after light exposure and after deionized water storage at 37 ºC for 24 h. Five indentations were made in the cross-sectional area at 100 and 700 μm depths from the top surface. Ten specimens were made for each test conditions. Data were submitted to ANOVA split-plot design (shade, post-cure time, mode of activation and depth), followed by Tukey post hoc test (α=0.05). Significant differences for shade (p0.05) were found, except for shade x post-cure time (p |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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