卤素灯和 LED 对树脂改良型玻璃离子体修复材料的激活作用。长期储存后的体外显微硬度。

Halogen lamp and LED activation of resin-modified glass ionomer restorative material. In vitro microhardness after long-term storage.

机构信息

Graduate Studies Division, Department of Restorative Dentistry, School of Dentistry, Guarulhos University, Brazil.

出版信息

Eur J Paediatr Dent. 2011 Sep;12(3):150-4.

PMID:22077680

Abstract

AIM

The purpose of this study was to evaluate the activation of resin-modified glass ionomer restorative material (RMGI, Vitremer-3M-ESPE, A3) by halogen lamp (QTH) or light-emitting diode (LED) by Knoop microhardness (KHN) in two storage conditions: 24 hrs and 6 months and in two depths (0 and 2 mm).

MATERIALS AND METHODS

The specimens were randomly divided into 3 experimental groups (n = 10) according to activation form and evaluated in depth after 24 h and after 6 months of storage. Activation was performed with QTH for 40s (700 mW/cm) and for 40 or 20 s with LED (1,200 mW/cm2). After 24 hrs and 6 months of storage at 37 degrees C in relative humidity in light-proof container, the Knoop microhardness test was performed. Statistics Data were analysed by three-way ANOVA and Tukey post-tests (p < 0.05).

RESULTS

All evaluated factors showed significant differences (p < 0.05). After 24 hrs there were no differences within the experimental groups. KHN at 0 mm was significantly higher than 2 mm. After 6 months, there was an increase of microhardness values for all groups, being the ones activated by LED higher than the ones activated by QTH.

CONCLUSION

Light-activation with LED positively influenced the KHN for RMGI evaluated after 6 months.

摘要

目的

本研究旨在评估卤素灯（QTH）或发光二极管（LED）通过维特默 3M-ESPE 树脂改良型玻璃离子体修复材料（RMGI，Vitremer-3M-ESPE，A3）对材料的激活作用，在两种存储条件下（24 小时和 6 个月）和两种深度（0 毫米和 2 毫米）通过努氏硬度（KHN）进行评估。

材料和方法

根据激活方式，将样本随机分为 3 个实验组（n=10），并在 24 小时后和 6 个月存储后分别在深度上进行评估。用 QTH 对材料进行 40 秒的激活（700 mW/cm），用 LED 进行 40 秒或 20 秒的激活（1200 mW/cm2）。在 37°C、相对湿度和避光容器中储存 24 小时和 6 个月后，进行努氏硬度测试。统计学数据采用三因素方差分析和 Tukey 事后检验（p<0.05）进行分析。