[玻璃离子聚合物水泥的蠕变研究]。

Odontostomatologike proodos Pub Date : 1989-12-01
J Papadoyannis, M Helvatzoglou-Antoniadis, M Sapountzis, E Kalinderis
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引用次数: 0

摘要

采用扭转蠕变装置研究了微晶玻璃离子胶结物的蠕变和恢复。目的是研究在正常咀嚼力可能导致的低应力下的粘弹性行为。在释放应力后,保持了低于复合树脂比例极限的小应力(2,048 MPa) 3 h。对样品进行了测量:在21℃干燥保存24 h,在21℃蒸馏水中保存24 h,在37℃蒸馏水中保存24 h,在37℃蒸馏水中保存1周。玻璃离子聚合物胶结物在低变形时表现为线性粘弹性行为。去除应力50h后,材料仍未恢复原状。在37℃蒸馏水中时效1周的试件蠕变和永久变形量最小,在21℃干燥条件下脱水影响明显,蠕变和永久变形量最大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
[Study of the creep of glass-ionomer cements].

The creep and recovery of microspecimens of glass-ionomer cements was studied using a tortional creep apparatus. The purpose was to investigate viscoelastic behavior in a low stress that might result from normal chewing forces. Small stress (2,048 MPa), below the composite resin's proportional limit, was maintained for 3 h and after the stress was released. Recovery was followed for 50 h. The measurements were made on specimens: aged 24 h stored dry at 21 degrees C, aged 24 h stored in distilled water at 21 degrees C, aged 24 h stored in distilled water at 37 degrees C, aged 1 week stored in distilled water at 37 degrees C. The glass-ionomer cements exhibited linear viscoelastic behavior at low deformations. The materials did not recover their original shape after 50 h after the stress was removed. The least amount of creep and permanent deformation exhibited the specimens aged for 1 week in distilled water at 37 degrees C. The influence of dehydration was apparent on specimens measured dry at 21 degrees C. They exhibited the greatest amount of creep and permanent deformation.

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