摘要
目的:探讨在3种不同的固化光源条件下,不同的温度对光固化复合树脂表面硬度的影响。方法:采用Z250复合树脂制作45个的圆盘形样本。以每组5个样本分成9组,分别在3种不同温度下(冷冻到5℃,室温25℃,预先加热到37℃)给予持续卤素光、软启动卤素光和二极管光(LED)照射固化。用Buehler Micromet二位数字显微硬度检测仪检测样本顶部和底部表面的显微硬度。获得的资料采用双向方差分析(ANOVA)。结果:无论使用何种光源,当复合树脂的温度增加,样本顶部和底部表面的显微硬度也增加。在3种不同温度下,采用LED光聚合的复合树脂的顶部和底部表面都获得了明显更好的硬度。采用软启动卤素光固化的复合树脂的顶部和底部表面的固化有效性明显减少。结论:预先加热复合树脂的方法能明显改善复合树脂的聚合。LED光比持续卤素光和软启动卤素光光聚合效果都好。
Objective：To explore the eftects of the microhardness of surfaces of composite resins by using three different light curing units at different temperatures. Methods：A total of 45 disc-shaped specimens were fabricated from Z250 composite resin （3M/ESPE, St. Paul, MN, USA） and were divided into nine groups by each of five samples. All samples in three different temperatures （ frozen to 5℃, at room temperature 25 ℃, pre-heated to 37 ℃ ） was cured by a continuous halogen light（QTH） ,a softstart halogen light and a light emitting diode （LED）. The microhardness of the top and bottom surfaces of the specimens was determined by using a Buehler Micromet Ⅱ digital microhardness tester （ Buehler, Dusseldorf, Germany）. Data obtained was analyzed by using two-way analysis of variance （ANOVA）. Results：As the temperature of composite resin increased, the top and bottom microhardness of the specimens also increased regardless of the type of polymerizing light used. The LED light produced a significant better hardness on top and bottom surfaces of composite resin specimens polymerized at three different temperatures. Effectiveness of cure at top and bottom surfaces of composite specimens was significantly reduced by using soft-start curing. Conclusion： The use of pre-warmed composite resins might help to improve polymerization of composite resin. LED light polymerization produces better results than halogen light.
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2008年第5期647-649,共3页
Journal of Practical Stomatology
关键词
复合树脂修复
显微硬度
固化光
复合树脂温度
Composite resin restorations
Microhardness
Curing lights
Composite resin temperature
