光聚合时间对长石陶瓷下树脂水泥显微硬度的影响。

María A Lei, Ricardo L Macchi, Mariana Picea
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引用次数: 0

摘要

在烤瓷贴面过程中,树脂水泥聚合是在牙瓷的插入下进行的。目的:探讨光活化时间对陶瓷树脂基水泥维氏硬度的影响。材料和方法:采用Paracore White Coltene (PC)、Densell Resin Duo Cement (DC)、3MRelyX Veneer (RX)和Coltene Fill Up!(FU),在光活化过程中插入0.6 mm厚的VitablockMarkII (Vita Zahnfabrik)长石陶瓷。使用强度为1200mw /cm2的Coltolux LED (Coltene)灯,以制造商指定的100%和25%的时间进行聚合。每个聚合时间组由每种材料的3个标本组成,在37°C的黑暗中干燥保存7天。使用Vickers Future Tech FM300显微硬度计(300 g, 5 s)对每个试样的上下表面进行三次维氏显微硬度测量,取平均值,并计算底/顶比值。结果采用方差分析。结果:不同的光活化时间对胶结物的硬度值有显著影响,部分胶结物之间存在显著差异。光活化时间对材料底/顶显微硬度比的影响无统计学差异。结论:在实验条件下,较短的光聚合时间和修复材料的介入对显微硬度评价的聚合质量有显著影响,但底顶比不受聚合时间的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of photopolymerization time on the microhardness of resin cement beneath feldspathic ceramic.

Effect of photopolymerization time on the microhardness of resin cement beneath feldspathic ceramic.

Effect of photopolymerization time on the microhardness of resin cement beneath feldspathic ceramic.

Effect of photopolymerization time on the microhardness of resin cement beneath feldspathic ceramic.

During ceramic veneer luting, resin cement polymerization is performed with interposition of the dental ceramic.

Aim: To evaluate how and how much the photoactivation time affects the Vickers hardness of resin-based cements with interposed ceramic.

Materials and method: A total 24 specimens H mm in diameter and 1 mm thick were made from Paracore White Coltene (PC), Densell Resin Duo Cement (DC), 3MRelyX Veneer (RX) and Coltene Fill Up! (FU), interposing VitablockMarkII (Vita Zahnfabrik) feldspathic ceramic 0.6 mm thick during photoactivation. The materials were polymerized using 100% and 25% of the times indicated by the manufacturers with a Coltolux LED ((Coltene) light with intensity 1200 mW/cm2. Each polymerization time group consisted of three specimens of each material, which were stored dry in darkness at 37 °C for 7 days. Three Vickers microhardness measurements were made on the top and bottom surfaces of each specimen using a Vickers Future Tech FM300 microhardness tester (300 g, 5 s). The values were averaged, and the bottom/top ratios calculated. Results were analyzed by ANOVA. (p<0.05) complemented with multiple comparisons using Tukey's test (p<0.05).

Results: Different photoactivation times were found to have a significant effect on hardness values of the cements evaluated, with significant differences between some of the cements. No statistically significant difference was found for the effect of photoactivation time on bottom/top microhardness ratio in those materials.

Conclusions: Under the experimental conditions employed, it can be concluded that photopolymerization for shorter times and the interposition of restorative material significantly affectpolymerization quality as evaluated by microhardness, but the bottom/top ratio was unaffected by differences in polymerization time.

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