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Type: Journal article
Title: In vitro wear rates of materials under different loads and varying pH
Author: Shabanian, M.
Richards, L.
Citation: Journal of Prosthetic Dentistry, 2002; 87(6):650-656
Publisher: Mosby Inc
Issue Date: 2002
ISSN: 0022-3913
Statement of
Mitra Shabanian and Lindsay C. Richards
Abstract: <h4>Statement of problem</h4>Despite the need for information about the wear characteristics of restorative materials, there have been few systemic studies of the factors that influence the rate of material wear.<h4>Purpose</h4>This study compared the wear rates of enamel and 3 tooth-colored restorative materials under different loads (0, 3.2, 6.7, and 9.95 kg) and pH levels (1.2, 3.3, and 7.0).<h4>Material and methods</h4>An electromechanical tooth wear machine was used so that standard restorations representing 3 materials could be worn by opposing enamel under controlled conditions. The wear rates of enamel, composite (Z100), a conventional glass ionomer cement (Fuji IX), and a resin-modified glass ionomer cement (Fuji II LC) were compared at a range of loads (0 to 9.95 kg) and pH levels (1.2 to 7.0) and also at different sites across each restoration. Ten specimens were randomly assigned to each experimental group. Wear assessment was performed with a modified light microscope to quantify the height changes at defined points across wear facets. Four-way analysis of variance was used to compare wear rates among materials, pH levels, loads, and sites. Post-hoc t tests identified significant differences between specific pairs of experimental conditions (P<.05).<h4>Results</h4>The wear rates of enamel and the other test materials varied significantly with pH (P<.0001), load (P<.0001), and type of material (P<.0001). Enamel wear was influenced most by varied pH, whereas the composite was least affected by acid. The conventional glass ionomer cement was more susceptible than the composite to the effects of varied pH; the acid susceptibility of the resin-modified glass ionomer cement was generally between that of the composite and conventional glass ionomer cement. Enamel and the conventional glass ionomer cement were affected similarly by load. The composite was more resistant than the conventional glass ionomer cement to wear at higher loads; the resin-modified glass ionomer cement exhibited intermediate load resistance.<h4>Conclusion</h4>Within the limitations of this study, the 3 test materials were more resistant than enamel to acid, with the composite demonstrating the lowest susceptibility to acid. The acid- and load-resistance of the resin-modified glass ionomer cement was consistently less than that of the composite and greater than that of the conventional glass ionomer cement.
Keywords: Dental Enamel
Tooth Attrition
Hydrochloric Acid
Silicon Dioxide
Resins, Synthetic
Composite Resins
Resin Cements
Dental Materials
Glass Ionomer Cements
Microscopy, Electron, Scanning
Analysis of Variance
Matched-Pair Analysis
Materials Testing
Dental Restoration, Permanent
Dental Restoration Wear
Hydrogen-Ion Concentration
Surface Properties
Stress, Mechanical
Statistics as Topic
DOI: 10.1067/mpr.2002.125609
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Dentistry publications

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