Ege University, Faculty of Dentistry, Department of Pediatric Dentistry, IZMIR, TURKEY.
Eur J Paediatr Dent. 2013 Jun;14(2):90-4.
The objective of this study was to assess the effect of heat application on the mechanical properties of glass ionomer cements.
experimental design. The effect of heat on glass ionomer cements during their setting was evaluated by measuring compressive strength, flexural strength and microhardness. Moroever, temperature changes from one surface of the glass ionomer cement specimens 2, 4, and 6 mm thick to the other surface were measured. A condensable glass ionomer cement (Fuji IX) and a ceramic-reinforced glass ionomer cement (Amalgomer CR) were used as test materials. Heat was applied with soldering iron for 2 minutes at 80±2oC. All mechanical tests were carried out 24 hours after the setting of glass ionomer cements.
No significant differences in compressive strength were found between the control groups and the heated groups. There were no statistically significant differences in the flexural strength value for both groups of Fuji IX. On the contrary, when heat was applied to Amalgomer, its mean flexural strength reached a value that was higher than that of Amalgomer control. Significant differences in microhardness were found between the control groups and the heated groups and between Fuji IX and Amalgomer CR. Temperature rising in both glass ionomer cements was also noted.
two-way ANOVA was used where appropriate and independent samples t-test was used in case of interaction.
It is established that heat application improved the surface mechanical properties of conventional glass ionomer cements.
本研究旨在评估热应用对玻璃离子水门汀力学性能的影响。
实验设计。通过测量抗压强度、弯曲强度和显微硬度来评估热对玻璃离子水门汀在凝固过程中的影响。此外，还测量了 2、4 和 6 毫米厚的玻璃离子水门汀试件一个表面到另一个表面的温度变化。使用可冷凝玻璃离子水门汀（Fuji IX）和陶瓷增强玻璃离子水门汀（Amalgomer CR）作为测试材料。将热应用于 80±2°C 的电烙铁上 2 分钟。所有机械测试均在玻璃离子水门汀凝固 24 小时后进行。
在抗压强度方面，对照组和加热组之间没有显著差异。两组 Fuji IX 的弯曲强度值均无统计学差异。相反，当热量施加于 Amalgomer 时，其平均弯曲强度达到高于 Amalgomer 对照组的值。在对照组和加热组之间以及 Fuji IX 和 Amalgomer CR 之间，显微硬度存在显著差异。还注意到两种玻璃离子水门汀的温度升高。
在适当的情况下使用双向方差分析，在存在相互作用的情况下使用独立样本 t 检验。
确定热应用改善了传统玻璃离子水门汀的表面力学性能。
