硅氧烷类和甲基丙烯酸酯类后牙复合树脂表面硬度及固化深度的比较评价：一项体外研究。
Comparative evaluation of surface hardness and depth of cure of silorane and methacrylate-based posterior composite resins: An in vitro study.
作者信息
Agrawal Abhishek, Manwar Narendra U, Hegde Shubha G, Chandak Manoj, Ikhar Anuja, Patel Aditya
机构信息
Department of Conservative Dentistry and Endodontics, Sharad Pawar Dental College, Sawangi, Wardha, Mumbai, Maharashtra, India.
出版信息
J Conserv Dent. 2015 Mar-Apr;18(2):136-9. doi: 10.4103/0972-0707.153070.
AIM
This in vitro study was carried out to compare the effect of LED light curing system on polymerization and hardness of silorane-based and methacrylate-based posterior composite resin.
MATERIALS AND METHODS
A total of 40 samples, 20 of silorane-based composite Filtek P-90 and 20 of methacrylate-based composite Heliomolar HB measuring 2 mm thickness and 8 mm diameter were prepared using Teflon molds and cured using LED curing light. The samples were polished and tested in Knoop hardness tester using a 50-gram load and dwell time of 15 seconds on top and bottom surfaces. The percentage depth of cure was calculated, and statistical analysis was performed using two-way ANOVA test and Student t- test.
RESULTS
Higher statistically significant values were seen for both the top and bottom surface hardness in silorane-based resins than methacrylate-based resins on LED light curing.
CONCLUSION
Greater depth of cure was achieved in silorane-based posterior composite than in methacrylate-based posterior composite resins with a statistically significant difference.
目的
进行本体外研究以比较发光二极管（LED）光固化系统对硅氧烷类和甲基丙烯酸酯类后牙复合树脂聚合及硬度的影响。
材料与方法
使用聚四氟乙烯模具制备总共40个样本，其中20个为硅氧烷类复合树脂Filtek P - 90，20个为甲基丙烯酸酯类复合树脂Heliomolar HB，样本厚度为2毫米，直径为8毫米，并使用LED固化灯进行固化。对样本进行抛光，然后在努氏硬度测试仪上使用50克载荷，在顶面和底面保持15秒的停留时间进行测试。计算固化深度百分比，并使用双向方差分析测试和学生t检验进行统计分析。
结果
在LED光固化下，硅氧烷类树脂顶面和底面的硬度在统计学上均比甲基丙烯酸酯类树脂具有更高的显著值。
结论
硅氧烷类后牙复合树脂比甲基丙烯酸酯类后牙复合树脂实现了更大的固化深度，且具有统计学上的显著差异。
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