CURING LIGHT PERFORMANCE AND POLYMERIZATION OF COMPOSITE RESTORATIVE MATERIALS
CURING LIGHT PERFORMANCE AND POLYMERIZATION OF COMPOSITE RESTORATIVE MATERIALS
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DOI：
10.1016/0300-5712(92)90136-z
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发表时间：
1992-06-01
影响因子：
4.4
通讯作者：
PETERS, MCRB
中科院分区：
文献类型：
--
作者：
SAKAGUCHI, RL;DOUGLAS, WH;PETERS, MCRB
大多数现代复合修复材料需要光活化聚合。 影响复合材料的光能吸收的变量已被检查其对聚合收缩的影响。 由于聚合收缩以复杂的方式与修复体的固化程度密切相关，因此该参数用作聚合程度的经验指标。 变量包括复合阴影，光源和复合样品之间的距离，以及光强度。 评价了三种树脂复合材料。 使用应变计方法评价凝胶聚合后的收缩。 对于光导尖端和材料表面之间大于2mm的距离，固化光强度迅速减小。 聚合收缩率与光照强度呈线性关系。 微填充复合材料和后复合材料的聚合收缩，使用恒定的固化时间和光强度，随样品厚度的增加而线性下降。 低于最佳的固化光源的光输出可以通过在合理的限度内增加应用时间来补偿。
The majority of modern composite restorative materials require light activation for polymerization. Variables affecting light energy absorption by the composite have been examined for their effect on the polymerization contraction. Since the polymerization contraction is closely associated in a complex way to the degree of cure of the restoration, this parameter served as an empirical indicator for the extent of polymerization. Variables included the composite shade, distance between the light source and composite sample, and light intensity. Three resin composites are evaluated. Post-gel polymerization contraction was evaluated using a strain gauge method. Curing light intensity diminished rapidly for distances greater than 2 mm between the tip of the light guide and material surface. A linear relationship was demonstrated between polymerization contraction and light intensity. The polymerization contraction of a microfilled composite and posterior composite, using a constant curing time and light intensity, decreased linearly with increasing sample thickness. Less than optimal light output of the curing light source can be compensated by increasing application time within reasonable limits.