DEPTH MICROHARDNESS OF GLASS-IONOMER CEMENTS

Citation
V. Dupuis et al., DEPTH MICROHARDNESS OF GLASS-IONOMER CEMENTS, Biomaterials, 17(1), 1996, pp. 71-74
Citations number
13
Categorie Soggetti
Engineering, Biomedical","Materials Science, Biomaterials
Journal title
ISSN journal
01429612
Volume
17
Issue
1
Year of publication
1996
Pages
71 - 74
Database
ISI
SICI code
0142-9612(1996)17:1<71:DMOGC>2.0.ZU;2-A
Abstract
The purpose of this study was to observe the effect of different condi tions of storage on the surface and in the depth of luting glass ionom er cement by measuring microhardness. The hardness of a glass ionomer cement was measured after storage in wet and dry conditions and in an atmosphere of 80% relative humidity, for times up to 1000 h. Storage i n distilled water produced a softening effect, but the depth hardness increased progressively. The penetration of the water is a surface phe nomenon and does not affect the depth of the cement. However, the ceme nt is vulnerable to moisture to a depth of 600 mu m and marginal gaps evolve in the range of 40 to 80 mu m when the luting cement at the too th crown margin is always destroyed.