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Lookup NU author(s): Dr Rie Nomoto, Professor John McCabe
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Objectives: To compare the erosion of glass ionomer, zinc phosphate and polycarboxylate cements using volumetric and gravimetric methods. Methods: For the volumetric method, the eroded depth of cement placed in a cylindrical cavity in PMMA was measured using a dial gauge after immersion in an eroding solution. For the gravimetric method, the weight of the residue of a solution in which a cylindrical specimen had been immersed was measured. 0.02 M lactic acid solution (0.02 M acid) and 0.1 M lactic acid/sodium lactate buffer solution (0.1 M buffer) were used as eroding solutions. The pH of both solutions was 2.74 and the test period was 24 h. Results: Ranking of eroded depth and weight of residue was polycarboxylate > zinc phosphate > glass ionomers. Differences in erosion were more clearly defined by differences in eroded depth than differences in weight of residue. In 0.02 M acid, the erosion of glass ionomer using the volumetric method was effected by the hygroscopic expansion. In 0.1 M buffer, the erosion for polycarboxylate and zinc phosphate using the volumetric method was much greater than that using the gravimetric method. This is explained by cryo-SEM images which show many holes in the surface of specimens after erosion. It appears that zinc oxide is dissolved leaving a spongy matrix which easily collapses under the force applied to the dial gauge during measurement. Significance: The volumetric method that employs eroded depth of cement using a 0.1 M buffer solution is able to quantify erosion and to make material comparisons. © 2003 Academy of Dental Materials. Published by Elsevier Science Ltd. All rights reserved.
Author(s): Nomoto R, Uchida K, Momoi Y, McCabe JF
Publication type: Article
Publication status: Published
Journal: Dental Materials
Year: 2003
Volume: 19
Issue: 3
Pages: 240-244
Print publication date: 01/05/2003
ISSN (print): 0109-5641
ISSN (electronic): 1879-0097
Publisher: Elsevier
URL: http://dx.doi.org/10.1016/S0109-5641(02)00036-2
DOI: 10.1016/S0109-5641(02)00036-2
PubMed id: 12628437
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