Journal of Dental Research, Vol 70, 208-210, Copyright © 1991 by International & American Associations for Dental Research Online Journals
Tensile fatigue limits of prosthodontic adhesives
S. A. Aquilino, A. M. Diaz-Arnold and T. J. Piotrowski
Department of Prosthodontics, College of Dentistry, University of Iowa, Iowa City 52242.
Tensile fatigue limits and ultimate tensile strengths of some prosthodontic
adhesive systems were determined. Ni-Cr-Be cylinders were: electro-etched,
chemically etched, and sand-blasted prior to being bonded end-to-end with
BIS-GMA and 4-META adhesives. Bonded specimens were stored in distilled
de-ionized water for three days prior to being tested. Fifteen paired
specimens per group were subjected to a cyclic tensile load for 1000
cycles. Tensile fatigue limits were determined by the staircase method.
Five specimens per group were tested for ultimate tensile strength. In
addition, those specimens which survived the 1000 cycles during fatigue
testing were also tested for ultimate tensile strength. Statistical
evaluations to compare tensile fatigue limits and ultimate tensile
strengths for fatigued and non-fatigued specimens were then performed. The
results indicated that the tensile fatigue limit and the ratio of fatigue
limit to ultimate tensile strength of the sand-blasted, 4-META adhesive
system were significantly lower than those of the other systems tested. The
application of a cyclic load significantly decreased the ultimate tensile
bond strength of the 4-META adhesive. Application of a cyclic load had no
significant effect on the ultimate tensile bond strengths of the BIS-GMA
systems tested.
