THE INFLUENCE OF WATER SORPTION ON THE DEVELOPMENT OF SETTING SHRINKAGE STRESS IN TRADITIONAL AND RESIN-MODIFIED GLASS-IONOMER CEMENTS
THE INFLUENCE OF WATER SORPTION ON THE DEVELOPMENT OF SETTING SHRINKAGE STRESS IN TRADITIONAL AND RESIN-MODIFIED GLASS-IONOMER CEMENTS
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DOI：
10.1016/0109-5641(95)80016-6
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发表时间：
1995-05-01
期刊：
影响因子：
5
通讯作者：
DAVIDSON, CL
中科院分区：
文献类型：
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作者：
FEILZER, AJ;KAKABOURA, AI;DAVIDSON, CL
目标.本研究的目的是确定一些传统和树脂改性玻璃离子水门汀的固化应力发展，并评估早期水暴露对这种应力的影响。方法.如Feilzer等人（1987）所述，在张力计装置中测定玻璃离子粘固剂的固化应力。本研究的结果表明，水的吸附对发展的固化收缩应力的粘接玻璃离子水门汀的影响。当固化发生在隔离条件下（无水合或脱水），所有传统的玻璃离子水门汀研究自发断裂，无论是粘性和/或内聚，由于发展的应力。早期暴露于水导致应力释放并防止自发压裂。对于光固化产物，在隔离条件下未观察到自发失效。由于水的吸附作用，应力释放使收缩应力转变为膨胀应力。建议通过使用渗透性基质系统，在适当的时间将传统玻璃离子水门汀暴露于水中。对于树脂改性产品所观察到的收缩应力转化为膨胀应力是否有利于修复，需要进一步研究。
Objectives. The aim of this study was to determine the setting stress development for some traditional and resin-modified glass ionomer cements and to assess the effect of early water exposure to this stress. Methods. The development of the setting stress of the glass ionomer cements was determined in a tensilometer set-up as described earlier by Feilzer ef al. (1987).Results. The results of this study show the influence of water sorption on the development of setting shrinkage stress in bonded glass ionomer cements. When curing took place under isolated conditions (no hydration or dehydration), all the traditional glass ionomer cements investigated fractured spontaneously, either adhesively and/or cohesively, due to the developing stress. Early exposure to water led to stress relief and prevented spontaneous fracturing. For the light-cured products, no spontaneous failures were observed under isolated conditions. Stress relief due to water sorption reversed the contraction stress into an expansion stress.Significance. Exposure of traditional glass ionomer cements to water at an appropriate time by the use of permeable matrix systems is advised. Whether the conversion of contraction stresses into expansion stresses, as observed for the resin-modified products, is beneficial for a restoration requires further study.