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The International Journal of Oral & Maxillofacial Implants



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Int J Oral Maxillofac Implants 4 (1989), No. 2     1. June 1989
Int J Oral Maxillofac Implants 4 (1989), No. 2  (01.06.1989)

Page 131-137

Microstructure and Mechanical Properties of Ti-Ta/Alumina and Ti-Nb/Alumina Joints for Dental Implants
Gibbesch, B. / Elssner, G. / Petzow, G.
The microstructure of Ti-Ta and Ti-Nb alloys diffusion bonded to a 99.7 wt% Al2O3 ceramic for dental implants is subdivided into a reaction double layer containing the phases TiAl and Ti3Al, a transition region of coarse α-Ti plates in ß-Ti, and the unaffected bulk metal, the α-Ti/ß-Ti structure of which can be refined by annealing at 800 °C for 1 hour after bonding. Optimized joints fabricated by diffusion bonding in a high vacuum at 1,200 °C from a 99.7 wt% Al2O3 ceramic and Ti-Ta alloys fitted in their thermal contraction behavior to that of the ceramic by the addition of 30 to 40 wt% Ta showed a fracture resistance of 2.3 MN/m3/2. Approximately 80% of the bend test specimens notched at the Ti-Ta/alumina interface failed by crack extension parallel to the interface within the ceramic, which is typical for a metal-ceramic bond of high to medium interfacial strength.

Keywords: bond strength, dental implant, interfacial microstructure