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Journal of Dental Research, Vol 68, 1194-1198, Copyright © 1989 by International & American Associations for Dental Research Online Journals

ARTICLES

Fractography of a bis-GMA resin

D. M. Davis and N. E. Waters
Department of Prosthetic Dentistry, King's College School of Medicine and Dentistry, London, England.

The fracture behavior of a bis-GMA resin was studied by means of the double-torsion test. The fracture parameter measured was the stress-intensity factor. Fracture occurred in either a stick-slip (unstable) or continuous (stable) manner, depending upon the test conditions. When stick-slip propagation occurred, the fracture surfaces showed characteristic crack-arrest lines. The fracture surfaces were examined by use of a reflected-light optical microscope. The stress-intensity factor for crack initiation was found to be related to the size of the crack-arrest line which, in turn, could be related to the Dugdale model for plastic zone size. The evidence supported the concept that the behavior of the crack during propagation was controlled by the amount of plastic deformation occurring at the crack tip.




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