Effect of thermocycling on the fracture toughness of composites

Abu Kasim, N.H. and McCabe, J.F. (1997) Effect of thermocycling on the fracture toughness of composites. Journal of Dental Research, 76 (5). p. 1211. ISSN 0022-0345

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Abstract

Fracture toughness has been recognised to be one of the most important mechanical property for retorative materials. It is the aim of this study to investigate the effect of thermocycling an fracture toughness of a range of dental composites; P50(P)1 , Silux Plus(S)2, Heliomolar(H)3, Clearfil Photo Posterior-light activated(CLA)4 and Clearfil Posterior-chemically activated(CC)3. 110 rectangular pre-notched specimens was prepared for each material utilising a stainless steel mould. The specimens were divided into 11 groups of 10 each. Test groups 1-6 were subjected to 0, 250, 500, 750, 1000 and 10,000 thermal cycles respectively. All specimens were subjected to a 3 point bend test and loaded at a crosshead speed of 1mm/min-1 on an Instron Testing Machine. The fracture toughess of all materials decreases with the number of thermal cycles and length of water storage except for CC where the fracture toughness increases during the earlier stages of thermocycling and water storage. However the lowest fracture toughness values were for groups 6 and 11. One way analysis of variance showed that Group 1 was significantly different from groups 6 and 11 (P<.05), the thermally cyled and the water storage groups were not different from each other for al materials. The decrease in fracture toughness exhibited by all light activated composites could be explained by interfacial stress formation and resin-filler debonding while the increase in fracture toughness during the earlier stages of thermocycling and water storage of chemically-activated composite be explained by continued polymerisation. Thermocycling did not cause any significant in fracture toughness composites over and above by water storage.

Item Type: Article
Additional Information: Times Cited: 0 AbuKasim, NH McCabe, JF
Uncontrolled Keywords: Self-Repair; Culture-Conditions; Composite Resin; Dental Pulp Stem Cell; Functionally Graded Design; Multi Layered Post; Functionally Graded Dental Post; Soft Skills; Clinical Pairing; Dental Pulp Stromal Cells; Long-Term Expansion
Subjects: R Medicine
R Medicine > R Medicine (General)
R Medicine > RK Dentistry
Divisions: Faculty of Dentistry > Dept of Conservative Dentistry
Depositing User: Associate Prof. Dr. Noor Hayaty Abu Kasim
Date Deposited: 25 Jan 2012 02:42
Last Modified: 20 Oct 2014 09:10
URI: http://eprints.um.edu.my/id/eprint/2493

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