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Microstructure, phase content, and thermal stability of a cast Co–Cr dental alloy after porcelain sintering cycles using electron backscatter diffraction

Published online by Cambridge University Press:  30 June 2015

Kai Chun Li ,
David J. Prior ,
J. Neil Waddell  and
Michael V. Swain
Kai Chun Li*
Affiliation:
Sir John Walsh Research Institute, University of Otago, Dunedin 9054, New Zealand
David J. Prior
Affiliation:
Department of Geology, University of Otago, Dunedin 9054, New Zealand
J. Neil Waddell
Affiliation:
Sir John Walsh Research Institute, University of Otago, Dunedin 9054, New Zealand
Michael V. Swain
Affiliation:
Biomaterials Laboratory, Faculty of Dentistry, University of Sydney, Sydney, Australia
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Phase maps of Co–Cr alloys bonded to dental porcelain cycled through an incremental number of porcelain firings at two separate thicknesses (0.5 and 1 mm) were analyzed. Bulk hexagonal close-packed (hcp) phase vol% of the alloy was found to increase with the number of porcelain firings for both 0.5 and 1 mm specimens. At the metal-porcelain interface, a uniform fine-grained hcp phase was observed. The depth and grain size of this hcp layer increased with the number of porcelain firings with the thicker specimens undergoing more substantial growth and transformation. Simple heat transfer modeling of the specimens during heat treatment cycles indicated that the thicker specimen had more time at high temperature to affect the face-centered cubic to hcp phase transformation. Therefore, the amount of porcelain firings and the thickness of the alloy should be considered and kept to a minimal when manufacturing metal-porcelain restoration.

Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 14 , 28 July 2015 , pp. 2188 - 2196
Copyright
Copyright © Materials Research Society 2015 

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