THE CREEP-BEHAVIOR OF GLASS-IONOMER RESTORATIVE MATERIALS

被引：16

作者：

PAPADOGIANNIS, Y

HELVATJOGLOUANTONIADI, M

LAKES, RC

SAPOUNTJIS, M

机构：

[1] Department of Biomedical Engineering University of Iowa, Iowa City

来源：

DENTAL MATERIALS | 1991年 / 7卷 / 01期

关键词：

D O I：

10.1016/0109-5641(91)90025-T

中图分类号：

R78 [口腔科学];

学科分类号：

1003 ;

摘要：

The creep of microspecimens of five glass-ionomer filling materials and one glass-ionomer-cermet cement was studied by means of a torsional creep apparatus. The glass-ionomer specimens were aged one week and conditioned in 37-degrees-C water. Shear stress of 2.47 x 10(-4) N.m was maintained for three h, and recovery was followed for 50 h. Creep curves were obtained at 21, 37, and 50-degrees-C. The effect of temperature increase was studied. All the glass ionomers exhibited linear visco-elastic behavior at low deformations. Their shear moduli and resistance to creep were similar to those of some composites measured by the same method. The increase of temperature influenced the creep behavior and moduli of the materials (i.e., increased creep and residual strains and decreased shear modulus). Although the applied torque was very small, there was permanent deformation, the result of viscous flow in all experiments which was more pronounced at 50-degrees-C.

引用

页码：40 / 43

页数：4

共 12 条

[1]

Lakes, Size Effects and Micromechanics of a Porous Solid, J. Mater Sci, 18, pp. 2572-2580, (1983)

[2]

McKinney, Antonucci, Rupp, Wear and Microhardness of Glass-ionomer Cements, J Dent Res, 66, pp. 1134-1139, (1987)

[3]

McLean, Aesthetics in Restorative Dentistry, Br Dent J, 149, pp. 368-373, (1980)

[4]

McLean, Alternatives to Amalgam Alloys, Br Dent J, 157, pp. 432-433, (1984)

[5]

McLean, Gasser, Glass Cermet Cements, Quint Int, 5, pp. 333-343, (1985)

[6]

Oilo, Characterization of Glassionomer Filling Materials, Dental Materials, 4, pp. 129-133, (1988)

[7]

Papadogiannis, Boyer, Lakes, Creep of Conventional and Microfilled Dental Composites, Journal of Biomedical Materials Research, 18, pp. 15-24, (1984)

[8]

Papadogiannis, Boyer, Lakes, Creep of Posterior Dental Composites, Journal of Biomedical Materials Research, 19, pp. 85-95, (1985)

[9]

Papadogiannis, Boyer, Lakes, Creep of Amalgam at Low Stresses, J Dent Res, 66, pp. 1569-1575, (1987)

[10]

Prosser, Powis, Wilson, Glass-ionomer Cements of Improved Flexural Strength, J Dent Res, 65, pp. 146-148, (1986)

← 1 2 →