20.500.12556/RUL-141219 Pre-oxidation of selective-laser-melted titanium dental alloy effects on surface characteristics and porcelain bonding The heat treatment of dental alloys prior to porcelain application/veneering has been proposed as a way to ensure sufficient oxide scale and to promote the porcelain's adherence in porcelain-fused-to-metal (PFM) fixed dental prostheses. The present study investigates the relationship between the bond strength of the dental porcelain to selective-laser-melted (SLM) titanium and the temperature of the titanium's pre-oxidation. The SLM Ti-6Al-4V substrates were airborne-particle abraded and either left to passivate in air at room temperature (control) or pre-oxidized in a furnace under vacuum conditions (10kPa) at temperatures of 300, 600, 750, or 800 °C. The surface characteristics were determined using contact profilometry to measure the profile roughness (R$_a$), atomic force microscopy for the surface roughness (S$_a$) and Auger electron spectroscopy for the thickness of the oxide scale. Dental porcelain was applied to the metal substrates and the titanium-ceramic bond was assessed according to the ISO standard 9693-1:2012. The metal-ceramic interfaces were analyzed with scanning electron microscopy and energy-dispersive spectroscopy. The R$_a$ and S$_a$ values showed a strong positive correlation with the pre-oxidation temperature. The oxide scales covering the titanium surfaces thickened markedly at temperatures of 750 °C and above. However, the bond strength was negatively correlated with the pre-oxidation temperature. Room-temperature passivation in air following the airborne-particle abrasion of the SLM titanium resulted in a titanium-ceramic bond that is well above the ISO 9693-1:2012 recommended minimum value for metal-ceramic systems. Thus, no pre-oxidation of SLM titanium frameworks is necessary prior to the application/firing of porcelain. prosthetic dentistry bond strength titanium metal-ceramic selective laser melting protetično zobozdravstvo trdnost vezi titan true false true Angleški jezik Slovenski jezik Članek v reviji 2022-09-26 08:41:16 2022-09-26 08:41:26 2022-09-28 03:14:57 0000-00-00 00:00:00 2021 0 0 Str. 2094-2109 no. 19 Vol. 35 2021 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 616.31 0169-4243 10.1080/01694243.2021.1877003 50192131 Pre_oxidation_of_selective_laser_melted_titanium_dental_alloy_effects_on_surface_characteristics_and_porcelain_bonding.pdf Pre_oxidation_of_selective_laser_melted_titanium_dental_alloy_effects_on_surface_characteristics_and_porcelain_bonding.pdf 1 5C5114D6A8683792654BED8EFEED6134 0d67a16861d07005e21525505afef15436bb03cf2f0118cf435acd4046575f48 c2e5f79c-3d66-11ed-9c94-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=162166 https://www.tandfonline.com/doi/full/10.1080/01694243.2021.1877003 0 7ead153e-3d66-11ed-9c94-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=162165 Medicinska fakulteta 0 0 0