Influence of polymerization time on properties of dual-curing cements in combination with high translucency monolithic zirconia
Influence of polymerization time on properties of dual-curing cements in combination with high translucency monolithic zirconia
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DOI：
10.1016/j.jpor.2018.06.003
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发表时间：
2018-10-01
影响因子：
3.6
通讯作者：
Cadenaro, Milena
中科院分区：
文献类型：
--
作者：
Alovisi, Mario;Scotti, Nicola;Cadenaro, Milena
目的：本体外研究的目的是评估两种双固化树脂水门汀在半透明整体氧化锆照射不同时间方案下的转化度（DC）、显微硬度（MH）和粘结强度。（1）Rely-X Ultimate;（2）Panavia SA。每组再根据照射时间分为3个亚组（n = 8）：（a）无光;（B）20 s;（c）120 s。在将样品放置在具有高功率multiLED灯的FT-IR分光光度计的金刚石载体上60秒后进行光固化。10 min后计算最终DC %。24 h后，对水泥层进行维氏测试。相同的协议被用来胶合复合材料圆柱体，以评估微剪切粘结强度测试。结果：两种骨水泥在（B）和（c）两个亚组中均达到较高的DC %。对于MH，统计表明，延长固化时间能够显著提高MH。粘合强度不受照射时间的影响，只有Panavia SA。结论：第一个零假设必须被拒绝，因为DC %和MH的双水泥测试的固化时间的影响。第二个零假设被部分拒绝，因为粘合强度仅受Rely-X Ultimate固化时间的影响。(C)2018日本口腔修复学会。出版社：Elsevier Ltd
Purpose: The aim of this in vitro study was to assess conversion degree (DC), micro-hardness (MH) and bond strength of two dual-curing resin cements employed under translucent monolithic zirconia irradiated with different time protocols.Methods: 84 square shaped samples of 1 mm thickness were prepared from high translucency zirconia blocks and divided into two groups (n = 24) according to the cement employed: (1) Rely-X Ultimate; (2) Panavia SA. Each group was further divided into 3 subgroups (n = 8) according to the irradiation time: (a) no light; (b) 20 s; (c) 120 s. Light curing was performed 60 s after the sample was placed on the diamond support of a FT-IR spectrophotometer with a high power multiLED lamp. Final DC% were calculated after 10 min. After 24 h, Vickers Test on the cement layer was performed. The same protocol was used to lute composite cylinders in order to evaluate microshear bond-strength test. ANOVA and Bonferroni tests were performed to find differences between MH and bond-strength to zirconia, while for DC% the Scheirer-Ray-Hare two-way test was used.Results: The two cements reached higher DC% in subgroup (b) and (c). As concern MH, statistics showed an increase in curing time was able to improve MH significantly. Bond-strength was not affected by irradiation time only for Panavia SA.Conclusions: The first null hypothesis has to be rejected since DC% and MH of the dual-cements tested were influenced by the curing time. The second null hypothesis is partially rejected since the bond strength was influenced by the curing time only for Rely-X Ultimate. (C) 2018 Japan Prosthodontic Society. Published by Elsevier Ltd.