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目的 :观察固化后二期处理对3种光固化复合树脂单体转化率的影响。方法:3种光固化复合树脂CHARISMA誖A2型、DenFilTM Flow、自制纳米羟基磷灰石复合树脂光照40 s固化后,分别给予光照5 min(B组)、140℃热处理7.5 min(C组)、132℃0.2 MPa热压处理6.5 min(D组)3种二期处理,不做任何二期处理组为对照组(A组)。利用傅立叶变换红外光谱仪,采用标准基线技术测得单体转化率,采用SPSS13.0软件包对数据进行统计学分析。结果:经二期处理的光固化复合树脂,单体转化率均有一定程度提高,140℃热处理组效果最佳,与对照组相比,差异显著(P<0.05);B、D处理组中,除DenFilTM Flow和CHARISMA誖B组与对照组相比差异无显著性外,其余与对照组相比均有显著差异(P<0.05);3种实验组中,DenFilTM Flow各组间、CHARISMA誖光照与热压组间、n-HA复合树脂光照与140℃组间相比,差异无显著性(P>0.05),其余两两相比,均差异显著(P<0.05)。结论:二期处理能提高复合树脂的单体转化率,其中,140℃热处理7.5 min效果显著,对改善复合树脂的综合性能具有一定作用。
Objective: To observe the effects of two curing treatments on the conversion of three kinds of light-cured composite resins. METHODS: After cured with CHARISMA A2, DenFilTM Flow and self-made nano-hydroxyapatite composite resin for 40 min, they were irradiated with light for 5 min (group B) and 140 ℃ for 7.5 min (group C), respectively. 132 ℃ 0.2 MPa heat treatment 6.5 min (D group) three kinds of two treatment, without any two treatment group as the control group (A group). The conversion of monomer was measured by Fourier transform infrared spectrometer and standard baseline technique. The data were analyzed by SPSS 13.0 software package. Results: The photocurable composite resin after two treatments showed a certain degree of increase in monomer conversion, the best effect was obtained at 140 ℃, which was significantly different from that of the control group (P <0.05). In the B and D treatment groups , Except DenFilTM Flow and CHARISMA paradox B, there was no significant difference compared with the control group (P <0.05). Among the three experimental groups, CHARISMA paradox There was no significant difference (P> 0.05) between n-HA composite resin light and 140 ℃ group, and there was significant difference between the other two groups (P <0.05). Conclusion: The second phase treatment can improve the monomer conversion of the composite resin. The heat treatment at 140 ℃ for 7.5 min has a significant effect, which can play a certain role in improving the comprehensive properties of the composite resin.