摘要
目的 :探讨光照强度对光固化复合树脂抗压、抗拉强度的影响。方法 :用WDW 10 0型微机控制电子万能试验机 ,测试比较不同光照强度 [第 1组 ,3 0 0mW /cm2 × 40s ;第 2组 ,5 0 0mW /cm2 × 40s ;第 3组 ,80 0mW /cm2 × 40s ;第 4组 ,(3 0 0mW /cm2 × 10s) + (5 0 0mW /cm2 × 3 0s) ;第 5组 ,(3 0 0mW /cm2 × 10s) + (80 0mW /cm2 × 3 0s) ]对光固化复合树脂抗压强度、微拉伸强度的影响。结果 :采用弱光引导固化方法固化的光固化复合树脂的抗压强度、微拉伸强度明显优于采用传统方法固化的树脂。结论
Objective: To study the effects of light intensity on the compressive strength and tensile strength of light -curing composite resin. Methods: 25 samples of Shade A (Dentsply,USA) light-curing composite resion in the size of 10×5×1(mm) and equally divided into 5 groups.The light intensities (mW/cm 2×40 s) of 300,500,800,300 mW/cm 2×10 s+500 mW/cm 2×30 s,300 mW/cm 2×10 s+800 mW/cm×30 s were applied during the light-curing in group 1,2,3,4 and 5 respectively.The compressive strength and tensile strength of of the samples were measured by computer-controlled electronic testing machine (type WDW-100). Results:The compressive strengths (MPa) of group 1,2,3,4 and 5 were 228.68±20.25,274.67±6.99,380.53±9.81,345.47±10.71 and 414.06±29.34 respectively (P<0.01); the tensile strength 14.31±1.55,20.25±2.66,33.71±4.14, 42.85±3.03 and 73.53±7.73 respectively (P<0.01).Conclusion: The ”soft-start polymerization”may result in higher compressive strength and tensile strength of light-curing composite resin than the ”continuous intensity polymerization”.
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2003年第5期473-474,共2页
Journal of Practical Stomatology
