IADR Abstract Archives
Influence of the Temperature on the Silane Application on Glass-Ceramic
Objectives: The aim of the study was to assess the temperature effect on the silane application over the surface of CAD/CAM lithium-disilicate glass-ceramic bonded to composite resin.
Methods: Fifty specimens of lithium-disilicate glass-ceramic (IPS e.max CAD) were cut out from the pre-sintered CAD/CAM blocks with a thickness of 2 mm; subsequently sintered following the manufacture’s instruction. The specimens were poured into acrylic-resin with the use of a mold and the outer surface was polished. To the surface three different protocols were applied as follows: hydrofluoric acid 9.6% for 30s and RelyX Ceramic Primer (RCP), hydrofluoric acid 9.6% for 30s and Clearfil Ceramic Primer (CCP), and Monobond Etch&Prime applied following manufacturer’s instruction (MEP). The three protocols were submitted to three different heating conditions; room temperature 25°C, incubator for 1min at 50°C, and incubator for 5min at 50°C. To the treated surfaces composite pins were cemented. After 24 hours of storage in distilled water micro-shear bond strength (µSBS) was performed, besides separated specimens were fabricated to evaluate the hydrophilicity of the surface and to the Fourier Transform Infrared Spectroscopy (FT-IR). Two-way ANOVA followed by Tukey’s test (p<0.05) were applied to find statistical differences.
Results: Except for MEP, the RCP and CCP presented higher µSBS when submitted to heat treatment. The highest µSBS value (39.4±5.3) was achieved by RCP after five minutes of heat treatment. The lowest value (17.5±5.5) was also presented by RCP, however, at room temperature 25°C. The contact angles for RCP and CCP decreased after heated treatment (fig.1). The FT-IR qualitative analysis presented differences in peaks for single (4000-2500) and double bonds (2000-1500) for CCP and triple bonds (2500-2000) for RCP, CCP and MEP.
Conclusions: The silane application under heated conditions will cause a significant increase on the bond strength of composite materials cemented to lithium-disilicate glass-ceramics. Therefore, the trimethoxysilypropyl methacrylate is refined by temperature increases.
Methods: Fifty specimens of lithium-disilicate glass-ceramic (IPS e.max CAD) were cut out from the pre-sintered CAD/CAM blocks with a thickness of 2 mm; subsequently sintered following the manufacture’s instruction. The specimens were poured into acrylic-resin with the use of a mold and the outer surface was polished. To the surface three different protocols were applied as follows: hydrofluoric acid 9.6% for 30s and RelyX Ceramic Primer (RCP), hydrofluoric acid 9.6% for 30s and Clearfil Ceramic Primer (CCP), and Monobond Etch&Prime applied following manufacturer’s instruction (MEP). The three protocols were submitted to three different heating conditions; room temperature 25°C, incubator for 1min at 50°C, and incubator for 5min at 50°C. To the treated surfaces composite pins were cemented. After 24 hours of storage in distilled water micro-shear bond strength (µSBS) was performed, besides separated specimens were fabricated to evaluate the hydrophilicity of the surface and to the Fourier Transform Infrared Spectroscopy (FT-IR). Two-way ANOVA followed by Tukey’s test (p<0.05) were applied to find statistical differences.
Results: Except for MEP, the RCP and CCP presented higher µSBS when submitted to heat treatment. The highest µSBS value (39.4±5.3) was achieved by RCP after five minutes of heat treatment. The lowest value (17.5±5.5) was also presented by RCP, however, at room temperature 25°C. The contact angles for RCP and CCP decreased after heated treatment (fig.1). The FT-IR qualitative analysis presented differences in peaks for single (4000-2500) and double bonds (2000-1500) for CCP and triple bonds (2500-2000) for RCP, CCP and MEP.
Conclusions: The silane application under heated conditions will cause a significant increase on the bond strength of composite materials cemented to lithium-disilicate glass-ceramics. Therefore, the trimethoxysilypropyl methacrylate is refined by temperature increases.
IMAGES
3146901_File000000.jpg
3146901_File000000.jpg