Pre-oxidation of selective-laser-melted titanium dental alloy : effects on surface characteristics and porcelain bonding

Antanasova, Maja (avtor), Kocjan, Andraž (avtor), Abram, Anže (avtor), Kovač, Janez (avtor), Jevnikar, Arne Peter (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: prosthetic dentistry, bond strength, titanium, metal-ceramic, selective laser melting
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: MF - Medicinska fakulteta
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2021
• Št. strani: Str. 2094-2109
• Številčenje: Vol. 35, no. 19
• PID: 20.500.12556/RUL-141219
• UDK: 616.31
• ISSN pri članku: 0169-4243
• DOI: 10.1080/01694243.2021.1877003
• COBISS.SI-ID: 50192131
• Datum objave v RUL: 26.09.2022

Gradivo je del revije

• Naslov: Journal of adhesion science and technology
• Skrajšan naslov: J. adhes. sci. technol.
• Založnik: Taylor & Francis
• ISSN: 0169-4243
• COBISS.SI-ID: 34942720

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: protetično zobozdravstvo, trdnost vezi, titan

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P2-0087
• Naslov: Keramični in komplementarni materiali za napredne inženirske in biomedicinske aplikacije