IADR Abstract Archives
Surface Properties of a New Lithium Disilicate After Grinding
Objectives: This study aimed to evaluate the effect of grinding on some surface properties of a new experimental lithium disilicate glass-ceramic, by simulating a clinical core adjustment and comparing it with a commercial material.
Methods: Discs (N=24, 12 mm in diameter) were separated into four groups: Experimental material with no grinding (E), Experimental material with grinding (EG), IPS e-max Press (Ivoclar) with no grinding (C) and IPS e-max Press with grinding (CG). Using a diamond stone in a low-speed handpiece device, 0.1mm deep grinding was carried out on the surface of the samples EG and CG (final dimension 1.4mm). The thickness of groups E and C were already 1.4mm. The effect of grinding on the sample surfaces was evaluated by X-ray diffraction, mechanical (mean roughness, Ra) and optical profilometry, scanning electron microscopy, goniometry (surface energy (SE), by the sessile drop method) and Vickers hardness (VH) testing. Ra was analyzed by the Kruskal-Wallis and Student-Newman-Keuls statistics. SE and VH were analyzed using two-way ANOVA.
Results: The Ra medians (µm) were: E = 1.69, EG = 1.57, C = 1.45, CG = 1.13, with p = 0.0284. SE and VH did not show any statistical difference between materials and treatments. The grinding procedure smoothed the sample surfaces.
Conclusions: Grinding did not significantly alter the surface properties of experimental material and IPS e-max Press. This new glass-ceramic has similar surface properties to the commercial material, which suggesting that clinical adjustment can be performed without changing these properties.
Methods: Discs (N=24, 12 mm in diameter) were separated into four groups: Experimental material with no grinding (E), Experimental material with grinding (EG), IPS e-max Press (Ivoclar) with no grinding (C) and IPS e-max Press with grinding (CG). Using a diamond stone in a low-speed handpiece device, 0.1mm deep grinding was carried out on the surface of the samples EG and CG (final dimension 1.4mm). The thickness of groups E and C were already 1.4mm. The effect of grinding on the sample surfaces was evaluated by X-ray diffraction, mechanical (mean roughness, Ra) and optical profilometry, scanning electron microscopy, goniometry (surface energy (SE), by the sessile drop method) and Vickers hardness (VH) testing. Ra was analyzed by the Kruskal-Wallis and Student-Newman-Keuls statistics. SE and VH were analyzed using two-way ANOVA.
Results: The Ra medians (µm) were: E = 1.69, EG = 1.57, C = 1.45, CG = 1.13, with p = 0.0284. SE and VH did not show any statistical difference between materials and treatments. The grinding procedure smoothed the sample surfaces.
Conclusions: Grinding did not significantly alter the surface properties of experimental material and IPS e-max Press. This new glass-ceramic has similar surface properties to the commercial material, which suggesting that clinical adjustment can be performed without changing these properties.