Influence of visible-light exposure on colour stability of current dual-curable luting composites
Influence of visible-light exposure on colour stability of current dual-curable luting composites
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DOI：
10.1046/j.1365-2842.2002.00823.x
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发表时间：
2002-04-01
影响因子：
2.9
通讯作者：
Matsumura, H
中科院分区：
文献类型：
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作者：
Koishi, Y;Tanoue, N;Matsumura, H
本研究旨在评价可见光照射对双固化涂胶复合材料颜色稳定性的影响。使用6种双固化粘结材料[Bistite II(BI)、Clapearl DC(CL)、Dior Light Activate Cement(DI)、G-Cera Cosmotech II(GC)、Lant-It(LU)和Variolink II(VA)]，采用两种方法制备圆盘试件：(I)双固化试件，在可见光照射下为120名S；(Ii)化学固化试件，化学固化，不曝光。每种材料和固化方式都制作了5个试件。24小时后，所有标本在37℃的蒸馏水中浸泡24周，在此期间用牙科比色仪测量颜色精度。在国际委员会L*a*b*颜色空间中表征的颜色首先在准备后24小时确定(基线颜色评估)，并在1、2、3、4、8、12、16和24周后再次确定。计算24 h与其他浸泡时间的色差(DeltaE*)值，并进行重复测量方差分析(ANOVA)。此外，用单因素方差分析和对比法对双固化和化学固化24周后的DeltaE*值进行了比较(P<；0.05)。ΔE*值受材料、固化方式和浸泡时间的影响(P=0.0001)。24周后，除VA材料外，双固化试件的ΔE*值显著低于化学固化试件。24周后，CL材料颜色变化最小(1.9+/-0.2)，VA材料颜色变化最小(4.5+/-0.9)。双固化涂胶复合材料应以双模式聚合，以确保颜色稳定。
This study was conducted to evaluate influence of visible-light exposure on colour stability of dual-curable luting composite. Using six dual-curable luting composites [Bistite II (BI), Clapearl DC (CL), Dicor Light Activated Cement (DI), G-Cera Cosmotech II (GC), Lute-It (LU) and Variolink II (VA), disk specimens were prepared with the following two methods: (i) dual-cured specimens, exposure with visible-light from a photo-curing unit for 120 s and (ii) chemical-cured specimens, chemically cured without exposure. Five specimens were produced for each material and curing mode. After 24 h, all specimens were immersed in distilled water at 37 degreesC for 24 weeks, during which colour accuracy was measured with a dental colorimeter. The colours characterized in the Commission Internationale d'Eclairage (CIE) L*a*b* colour space were first determined 24 h after preparation (baseline colour evaluation), and again after 1, 2, 3, 4, 8, 12, 16 and 24 weeks. The colour difference (DeltaE*) values between 24 h and the other immersion periods were calculated, and then analysed by repeated measure analysis of variance (ANOVA). In addition, the DeltaE* values after 24 weeks for dual-cured specimens were compared with those for chemical-cured specimens by one-way ANOVA and by contrasts for each composite (P < 0.05). The ΔE* values were influenced by the material and curing mode as well as immersion period (P = 0.0001). After 24 weeks the dual-cured specimens showed significantly lower ΔE* values than the chemical-cured specimens, except for the VA material. The CL material exhibited the least colour change (1.9 +/- 0.2) among the dual-cured specimens, and the VA material showed the least (4.5 +/- 0.9) among the chemical-cured specimens after 24 weeks. Dual-curable luting composites should be polymerized with the dual modes to ensure colour stability.