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目的:评价光照射模式对双重固化树脂水门汀显微硬度的影响。方法:将5种双重固化自黏结树脂水门汀Biscem、Clearfil SA Cement、G-CEM LinkAce、Maxcem Elite、RelyX U100和2种双重固化常规型树脂水门汀DUOLINK和Nexus 3注满有机玻璃圈(内径7.5 mm,高1 mm),分别接受持续照射(20 s)和延迟照射(5 s照射+60 s延迟+20 s照射)后,置于37℃下避光干燥储存。每组试件(n=5)光照射后0.5 h、1 d和4周,分别接受努氏显微硬度测量,然后将光照射后4周的所有试件浸泡在无水乙醇中24 h,再次测量硬度值,并计算试件浸泡前、后的硬度值降低百分比。采用SPSS 16.0软件包对数据进行统计学分析。结果:2种照射模式下,7组材料硬度值的增长主要发生在照射后24 h。除Biscem外,照射模式未对其余6种材料照射后4周的硬度值产生显著影响(P>0.05);但在软化实验条件下,持续照射模式下的5种自黏结树脂水门汀硬度值降低百分比显著高于延迟照射模式下相应的硬度值降低百分比(P<0.05),而2种常规型树脂水门汀的硬度降低百分比未受到照射模式的影响(P>0.05)。结论:自黏结树脂水门汀在延迟照射模式下能够获得更好的抗软化能力。
Objective: To evaluate the effect of light irradiation on the microhardness of double-cured resin cement. METHODS: Five types of double-cure, self-adhesive resin cements, Biscem, Clearfil SA Cement, G-CEM LinkAce, Maxcem Elite, RelyX U100 and two dual cure conventional resin cements DUOLINK and Nexus 3, High and 1 mm high respectively). After receiving continuous irradiation (20 s) and delayed irradiation (5 s irradiation + 60 s delay + 20 s irradiation), the plate was stored in the dark at 37 ° C. Each group of specimens (n = 5) were exposed to Knoop microhardness at 0.5 h, 1 d and 4 wk after light irradiation, and then all the specimens at 4 wk after light irradiation were soaked in absolute ethanol for 24 h, Measure the hardness again, and calculate the percent reduction of the hardness value before and after immersion of the specimen. Data were analyzed statistically using SPSS 16.0 software package. Results: Under the two irradiation modes, the growth of hardness of seven groups occurred mainly 24 h after irradiation. Except for Biscem, the irradiation mode did not affect the hardness values of the other six materials after 4 weeks of exposure (P> 0.05). However, under the softening experiment, the percentages of 5 kinds of self-adhesive resin (P <0.05). However, the percentage reduction of hardness of two conventional resin cements was not affected by irradiation pattern (P> 0.05). Conclusion: Self-adhesive resin cement can achieve better anti-softening ability in delayed irradiation mode.