Evaluation of Interfacial Bonding Strength between Laser Textured Metal Coping and Porcelain

✍ Scribed by Mee-Kyoung Son; Han-Cheol Choe

• Publisher: Elsevier
• Year: 2011
• Tongue: English
• Weight: 789 KB
• Volume: 10
• Category: Article
• ISSN: 1877-7058
• DOI: 10.1016/j.proeng.2011.04.378

✦ Synopsis

Porcelain fracture at the interface between metal and porcelain is one of the most common clinical failures. For the clinical longevity, metal-ceramic prostheses must have satisfactory bond strength of the metal structure to porcelain. In this in-vitro study, to evaluate the effect of mechanical texturing of cast metal alloy for the interfacial bonding strength, sandblasting with Al 2 O 3 and laser surface texturing in two different metal alloys were compared. To fabricate cast specimens, Ni-Cr and Ni-Cr-Ti alloy were casted with 25 x 0.5 x 3mm bar. Before porcelain application, 5 specimens of cast Ni-Cr alloy and 5 specimens of cast Ni-Cr-Ti alloy were abraded at 3-4 bar air pressure, using 50μm aluminium oxide particles for 10s at 10 cm distance. Other each 5 specimens of cast Ni-Cr alloy and Ni-Cr-Ti alloy were treated with laser surface texturing. The laser work was done with femtosecond laser. After surface treatment, surface morphology was observed under optical photographs and FE-SEM. Surface roughness and wettability were examined. All specimens were followed by application of opaque and body porcelain layers by recommendation of manufacturer. For the three point bending test, porcelain was added to the metal specimens to the dimension of 8 x 3 x 1mm in the central portion of each metal specimen. The device, containing the metal-ceramic specimen, was placed on a universal testing machine and loaded at cross head speed of 1.50mm/min until fracture of the specimen occurred. The failure load was recorded in a computer using software provided by the manufacturer of the testing machine. After the bonding test, FE-SEM was used to examine the fracture site and interface between textured metal alloys and porcelain.