This Article Full Text (PDF) References Alert me when this article is cited Alert me if a correction is posted Citation Map 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 Krejci, I. Articles by Lutz, F. Search for Related Content PubMed PubMed Citation Articles by Krejci, I. Articles by Lutz, F. Pubmed/NCBI databases Compound via MeSH Substance via MeSH Hazardous Substances DB MAGNESIUM COMPOUNDS MAGNESIUM OXIDE SILICON DIOXIDE Social Bookmarking                         What's this?

The Influence of Antagonist Standardization on Wear

lUniversity of Geneva, School of Dentistry, Department of Cariology, Endodontology and Pediatric Dentistry, Ecole de Medecine dentaire, 19, rue Barthelemy-Menn, CH-1205 Geneva, Switzerland

P. Albert

Department of Preventive Dentistry, Periodontology and Cariology, Dental Institute, Zurich University, Plattenstrasse 11, CH-8028 Zurich, Switzerland

F. Lutz

Department of Preventive Dentistry, Periodontology and Cariology, Dental Institute, Zurich University, Plattenstrasse 11, CH-8028 Zurich, Switzerland

For differences among materials to be easily detected, low variation in in vitro wear tests is desirable. The working hypothesis of this paper was that antagonists standardized for shape and size and according to materials would show mean values similar to those found in natural, non-standardized cusps, and that standardization would lead to a reduction in mean variation. First, the shapes and sizes of palatal cusps of non-erupted human upper third molars were measured. The cusp cupola was best described by the formula y = 0.001 x2 and was symmetrical around the axis of rotation. Up to 200 µm of the y-axis, this parabola corresponded best to a ball radius of 0.6 mm. Based on this information, standardized antagonists were fabricated from both human enamel and steatite. Wear in the occlusal contact area and the wear of opposing conventional ceramic and fine hybrid composite, respectively, were quantified in a computerized chewing simulator. As a control, natural human enamel cusps were used. Standardization of enamel cusps did not reduce the variation of the resulting wear compared with that of non-standardized enamel antagonists. Furthermore, standardization led to significantly different results both in the antagonists and in the opposing restorative materials. Thus, natural enamel antagonists are preferable for the simulation of wear in the occlusal contact area.

Key Words: antagonist standardization • wear • in vitro test • steatite • enamel

Journal of Dental Research, Vol. 78, No. 2, 713-719 (1999)
DOI: 10.1177/00220345990780021201


CiteULike    Complore    Connotea    Del.icio.us    Digg    Reddit    Technorati    Twitter    What's this?