Browse by author
Lookup NU author(s): Dr Koichi Fujii, Dr Bob Bicker, Professor John McCabe
Full text for this publication is not currently held within this repository. Alternative links are provided below where available.
Objective. The purpose of this study was to investigate the effect of the applied load in a rolling-ball device on the surface contact fatigue of two dental filling materials: a microfilled composite (FA) and a glass ionomer (GFII). Methods. Disk specimens 10 mm diameter by 1.5 mm thick were set into cavities cut in plates of PMMA. After setting, the specimens were ground and polished using wet-carborundum paper followed by 1 μm alumina and then stored for 24 h in water at 23 °C. The surface fatigue test was carried out using loads ranging from 100 to 500gf through a ruby ball 2 mm diameter using a rolling-ball device. The ball was set to rotate at 720 rpm and a surface profile was determined on impressions recorded at regular intervals. Fatigue life was defined as the number of cycles to produce a track 5 μm deep and was determined by interpolation. Data were statistically analyzed by ANOVA and t-tests at a significance level of 0.05. Results. At loads ranging from 200 to 500gf the fatigue life was 0.7-10.6×105 cycles for FA, and 0.7-4.8×103 cycles for GFII. For both materials the fatigue life was reduced significantly by increasing the test load (p<0.05). The surface contact fatigue life for FA was at least 100 times greater than that for GFII at all loads. Significance. The rolling ball device was confirmed as a simple and meaningful device for the study of surface contact fatigue. A microfilled composite is very much more resistant to contact fatigue than a glass ionomer. © 2004 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
Author(s): Fujii K, Carrick TE, Bicker R, McCabe JF
Publication type: Article
Publication status: Published
Journal: Dental Materials
Year: 2004
Volume: 20
Issue: 10
Pages: 931-938
ISSN (print): 0109-5641
ISSN (electronic): 1879-0097
Publisher: Elsevier, Inc.
URL: http://dx.doi.org/10.1016/j.dental.2004.02.005
DOI: 10.1016/j.dental.2004.02.005
PubMed id: 15501321
Altmetrics provided by Altmetric
