ELUTION OF UNCURED MONOMERS RELEASED FROM A RESIN COMPOSITE POLYMERIZED AT THE REDUCED RATE

研究了树脂复合材料在降低聚合速率下对牙本质洞内边缘密合性和径向拉伸强度的影响。此外，通过内部硬度和未固化单体的洗脱来评估固化程度。为此，设计了能够改变光强度的光源。1.在9V下聚合120秒，在用三种光固化树脂复合物Palfique Estelite、Z-100、Lite-fil II A修复的牙本质洞中产生良好的边缘适应性。2.在9V下聚合120秒的样品显示出期望的硬度，因为该照射条件产生与常规条件相当的努普硬度，12 V对于60，3.在9V下聚合120秒的样品的径向拉伸强度与在12 V下固化60秒的样品的径向拉伸强度没有差异。4.从经辐照的树脂样品Lite-fil II A中洗脱未固化的单体HEMA、TEGDMA和Bis-GMA。5.当样品在8V下聚合时，释放的未固化单体随着辐射时间的增加而减少。6.对于TEGDMA和Bis-GMA，无论聚合是在降低的速率、8V下还是在正常电压下进行，12 V.7.以降低的速率聚合可能产生与所需机械性能良好适应的树脂复合修复体。

The effects of the polymerization of the resin composite at the reduced rate were investigated on marginal adaptation in the dentinal cavities and diametral tensile strength. Besides the degree of cure was evaluated by the internal hardness and elution of uncured monomers on. A light source which enabled to change the light intensity was intended for the aim.To summarize :1.Polymerization at 9 V for 120 seconds resulted in a good marginal adaptation in the dentinal cavities restored with three light-cured resin composites, Palfique Estelite, Z-100, Lite-fil II A.2.The specimens polymerized at 9 V for 120 seconds showed a desirable hardness since this irradiation condition produced comparative Knoop hardness to the ordinal condition, 12 V for 60, used clinically.3.The diametral tensile strengths of the specimens polymerized at 9 V for 120 seconds did not differed to those cured at 12 V for 60 seconds.4.Uncured monomers of HEMA,TEGDMA and Bis-GMA were eluted from the irradiated resin specimens, Lite-fil II A.5.When the specimens were polymerized at the 8 V,the uncured monomers released decreased with an increase in irradiation time.6.For TEGDMA and Bis-GMA the eluted values did not differ whether polymerization was performed at the reduced rate, 8V,or at the ordinal voltage, 12 V.7.Polymerization at the reduced rate possibly produces a resin composite restoration well adapted with desirable mechanical properties.