ePrints

Erosion of water-based cements evaluated by volumetric and gravimetric methods

Lookup NU author(s): Dr Rie Nomoto, Emeritus Professor John McCabe

Downloads

Full text for this publication is not currently held within this repository. Alternative links are provided below where available.

Abstract

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.

Publication metadata

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

Altmetrics

Share