THE EFFECT OF STORAGE MEDIA UPON THE SURFACE MICROHARDNESS AND ABRASION RESISTANCE OF 3 COMPOSITES

被引:95
作者
CHADWICK, RG
MCCABE, JF
WALLS, AWG
STORER, R
机构
[1] Newcastle upon Tyne, NE2 4BW, The Dental School Framlington Place
关键词
D O I
10.1016/S0109-5641(05)80042-9
中图分类号
R78 [口腔科学];
学科分类号
1003 ;
摘要
The effects of various storage media [distilled water, lactate (pH 4.0), and citrate (pH 6.0) buffers] upon the hardness and wear factor values of three composites [Occlusin (O), P-30 (P), and FulFil (F)] were studied. Over the one-year storage period, the hardness of all three materials stored in citrate buffer was unchanged. In the case of P in water and all materials stored in lactate buffer, a reduction was observed. There was no significant difference (P > 0.05) between the wear factors of specimens after one year or one week of water storage. Specimens of F stored in citrate buffer had a wear factor (P < 0.01) higher than that of those stored in water. The other materials were not affected by storage in the lactate or citrate buffers. A reduction in surface hardness for some materials did not result in an increase in wear rate. This indicates that the softening effect was limited to a thin surface layer. Although not significant in vitro, this effect would probably increase the rate of in vivo wear, since the softened material would be lost, exposing a fresh surface to further attack. This would adversely prejudice the material's long-term clinical durability by impairing its resistance to abrasion. © 1990.
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页码:123 / 128
页数:6
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