Influence of the interposition of ceramic spacers on the degree of conversion and the hardness of resin cements
Influence of the interposition of ceramic spacers on the degree of conversion and the hardness of resin cements
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DOI：
10.1590/s1806-83242013000500004
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发表时间：
2013-09-01
影响因子：
2.5
通讯作者：
Gonzaga, Carla Castiglia
中科院分区：
文献类型：
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作者：
Calgaro, Patricia Angelica Milani;Furuse, Adilson Yoshio;Gonzaga, Carla Castiglia
本研究评价了：I）通过陶瓷的光活化对光固化和双重固化树脂粘固剂的转化度（DC）和努普硬度（KHN）的影响;和II）用于获得未固化材料的光谱以确定双重固化树脂粘固剂的DC的两种不同方案。水泥薄膜通过厚度为1.5 mm和2.0 mm的陶瓷[石英瓷（FP）;低透明度（e.max-LT）、中等透明度（e.max-MO）和高透明度（e.max-HT）的二硅酸锂玻璃陶瓷;玻璃渗透氧化铝复合材料（IC）和多晶氧化锆（ZR）]进行光活化。通过傅里叶变换红外（FTIR）光谱分析DC。使用两种方案来获得未固化材料的光谱：I）将基础和催化剂糊剂混合，和II）分别获得基础和催化剂糊剂的薄膜，并获得平均值。使用圆柱形样本进行KHN评估。通过ANOVA和Tukey检验（α = 0.05）分析结果。光固化水泥的DC（61.9%）高于双固化水泥（55.7%）。DC变化如下：FP（65.4%）、e.max-HT（65.1%）、e.max-LT（61.8%）、e.max-MO（60.9%）、ZR（54.8%）和IC（44.9%）。光固化水泥的KHN（22.0）低于双固化水泥（25.6）。在1.5 mm垫片下固化的骨水泥的KHN（26.2）高于在2.0 mm陶瓷下聚合时的KHN（21.3）。关于两种方案，只有三组存在显著差异。因此，这两种方法都可以被认为是合适的。树脂水门汀的物理和机械性能可能受到在光活化期间插入的陶瓷材料的厚度和微观结构的影响。
This study evaluated: I) the effect of photo-activation through ceramics on the degree of conversion (DC) and on the Knoop hardness (KHN) of light- and dual-cured resin cements; and II) two different protocols for obtaining the spectra of uncured materials, to determine the DC of a dual-cured resin cement. Thin films of cements were photo-activated through ceramics [feldspathic porcelain (FP); lithium disilicate glass-ceramics of low translucency (e.max-LT), medium opacity (e.max-MO) and high translucency (e.max-HT); glass-infiltrated alumina composite (IC) and polycrystalline zirconia (ZR)] with thicknesses of 1.5 and 2.0 mm. DC was analyzed by Fourier transform infrared (FTIR) spectroscopy. Two protocols were used to obtain the spectra of the uncured materials: I) base and catalyst pastes were mixed, and II) thin films of base and catalyst pastes were obtained separately, and an average was obtained. KHN assessment was performed with cylindrical specimens. The results were analyzed by ANOVA and Tukey's test (alpha = 0.05). The light-cured cement showed higher DC (61.9%) than the dual-cured cement (55.7%). The DC varied as follows: FP (65.4%), e.max-HT (65.1%), e.max-LT (61.8%), e.max-MO (60.9%), ZR (54.8%), and IC (44.9%). The light-cured cement showed lower KHN (22.0) than the dual-cured (25.6) cement. The cements cured under 1.5 mm spacers showed higher KHN (26.2) than when polymerized under 2.0 mm ceramics (21.3). Regarding the two protocols, there were significant differences only in three groups. Thus, both methods can be considered appropriate. The physical and mechanical properties of resin cements may be affected by the thickness and microstructure of the ceramic material interposed during photo-activation.