摘要
目的探讨3M2500型卤素光固化灯和3M FreeLight型LED光固化灯对光固化复合树脂机械强度及固化深度的影响。方法用WD-5A型电子拉力试验机、DUH-W201S型动态超显微硬度计2种仪器,通过测试比较卤素光固化灯和LED光固化灯照射Tetric ceram HB(Vivadent)A2色光固化复合树脂后其挠曲强度、压缩强度、表面硬度、固化深度的差异,从而比较3M2500型卤素光固化灯和3M FreeLight型LED光固化灯的性能。结果卤素光固化灯照射Tetric ceram HB复合树脂40s,LED光固化灯照射Tetric ceram HB10s,前者固化深度平均可达3.98mm,后者固化深度平均可达2.136mm,两者均可完全固化2mm,LED光固化灯固化树脂深度低于卤素光固化灯;表面硬度DHT115平均值分别为73.292MPa和39.668MPa,统计学分析95%水平有差别(P<0.05),LED灯对应的树脂硬度低于卤素灯;压缩强度平均值分别为242.1MPa和287.7MPa,统计学分析95%水平无明显差别(P>0.05);挠曲强度平均值分别为88.9MPa和97.0MPa,统计学分析95%水平无明显差别(P>0.05)。结论LED灯照射Tetric ceram HB复合树脂10s能达到卤素灯照射Tetric ceram HB复合树脂40s的聚合水平,适合于口腔临床应用。
Objective ：To study the effects of 3M 2500 halogen curing light and 3M FreeLight LED curing light on the mechanical strength and cure depth of light curing composite resin. Methods： Standard cylinder samples of Tetric ceram HB（Vivadent,Switzerland） A2 light curing composite were prepared for cure depth and compressive strength tests and cubic samples for surface hardness and flexure strength test. For each test equal number of the samples were cured by 3M 2500 halogen curing light and 3M FreeLight LED curing light respectively. Flexure strength, compressive strength, surface hardness and cure depth of the samples were tested respectively by electronic testing machine and Dynamic Ultra Micro Hardness Tester. Results ：The mean depth of the samples（ n = 5 ） cured by 3M 2500 halogen curing light and 3M FreeLight LED curing light were 3.98 mm and 2. 136 mm（P 〈0.01 ）,the surface hardness DHTII5 （MPa） （ n = 6） 73. 292 and 39. 668 （ P 〈 0. 05 ）, the compressive strength（MPa） （ n = 5 ） 242. I and 287.7 （ P 〉 0. 05 ）, the flexure strength （MPa） （ n = 5 ） 88.9 ± 16.2 and 97.0 ± 6.7 （ P 〉 0. 05 ）, respectively. Conclusion ： LED curing light can reach the performance level of halogen curing light and is suitable for routine oral clinical application for resin curing.
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2006年第2期227-229,共3页
Journal of Practical Stomatology
关键词
复合树脂
固化深度
表面硬度
压缩强度
挠曲强度
Composite resin
Cure depth
Sugface hardness
Compressive strength
Flexure strength
