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A Two-body Frictional Wear Test

Department of Restorative Dentistry, The Dental School, Newcastle Upon Tyne NE2 4BW, England

J.E. McCabe

Department of Restorative Dentistry, The Dental School, Newcastle Upon Tyne NE2 4BW, England

A.W.G. Walls

Department of Restorative Dentistry, The Dental School, Newcastle Upon Tyne NE2 4BW, England

Enamel abraders used in two-body wear tests suffer the disadvantage that standardization is difficult or impossible to obtain. The aim of this study was to test whether steatite (a ceramic material with a Vickers Hardness similar to that of enamel) could be used as a satisfactory human enamel analogue. The friction and wear characteristics of 'spherical' abraders made from these two materials against composite and amalgam specimens were therefore compared. A two-body wear test for restorative materials was devised which could be carried out in a Universal Testing Machine and which allowed for continuous monitoring of the frictional forces during wear. The results showed that steatite and enamel abraders produced similar coefficients of friction (correlation coefficient, r = 0.98). A linear relationship was found between depth (and volume) of wear and number of cycles (r = 0.98 to 0.99). Wear rate was not affected by the increase in abrader facet area. The wear rate against the steatite abrader was slightly greater than that against enamel, but the two abraders were reasonably correlated (r = 0.94). Friction and wear were correlated for the steatite abrader (P < 0.05, r = 0.88) but not the enamel abrader. The hybrid composites had a high wear rate and wore both the abraders more than did the microfilled composites or amalgam. These findings suggest that steatite is a suitable substitute for enamel in this type of test.

Key Words: Abrasion Resistance • Composites • Dental Amalgam • Dental Enamel • Wear Resistance.

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Journal of Dental Research, Vol. 73, No. 9, 1546-1553 (1994)
DOI: 10.1177/00220345940730091001


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This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Wassell, R.W. Articles by Walls, A.W.G. Search for Related Content PubMed PubMed Citation Articles by Wassell, R.W. Articles by Walls, A.W.G. Pubmed/NCBI databases Compound via MeSH Substance via MeSH Hazardous Substances DB ETHYL CARBAMATE MAGNESIUM COMPOUNDS MAGNESIUM OXIDE SILICON DIOXIDE Social Bookmarking                         What's this?