PMID: 11323987Apr 28, 2001Paper

A comparative evaluation of dental luting cements by fracture toughness tests and fractography

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
A K RyanC A Mitchell

Abstract

In recent years there has been a shift from traditional methods of investigating dental materials to a fracture mechanics approach. Fracture toughness (KIC) is an intrinsic material property which can be considered to be a measure of a material's resistance to crack propagation. Glass-ionomer cements are biocompatible and bioactive dental restorative materials, but they suffer from poor fracture toughness and are extremely susceptible to dehydration. The main objective of this study was to evaluate the fracture toughness of three types of commercially available dental cements (polyacid-modified composite resin, resin-modified and conventional glass ionomer) using a short-rod chevron-notch test and to investigate and interpret the results by means of fractography using scanning electron microscopy. Ten specimens of each cement were fabricated according to manufacturers' instructions, coated in varnish, and stored at ambient laboratory humidity, 100 per cent relative humidity, or in water at 37 degrees C for 7 days prior to preparation for testing. Results indicated that significant differences existed between each group of materials and that the fracture toughness ranged from 0.27 to 0.72 MN/m3/2. It was concluded that the resin...Continue Reading

References

Sep 1, 1985·Journal of Biomedical Materials Research·M Goldman
May 1, 1984·Journal of Oral Rehabilitation·C H Lloyd, L Mitchell
Jan 1, 1982·Journal of Oral Rehabilitation·C H Lloyd, R V Iannetta
Jul 1, 1993·Dental Materials : Official Publication of the Academy of Dental Materials·R E Kovarik, C W Fairhurst
Jan 1, 1996·Dental Materials : Official Publication of the Academy of Dental Materials·A Fujishima, J L Ferracane
Sep 14, 1999·Dental Materials : Official Publication of the Academy of Dental Materials·C A MitchellY S Cheng

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Citations

Sep 11, 2002·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·A K RyanJ F Orr
Jul 30, 2005·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·C A Mitchell, J F Orr

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