Subramaniam P, Girish Babu K L, Neeraja G, Pillai S
J Clin Pediatr Dent. 2017;41(1):62-65. doi: 10.17796/1053-4628-41.1.62.
Propolis is a natural resinous substance produced by honey bees. The antimicrobial effects of glass ionomer cement have been shown to improve with the addition of propolis; however its effect on the physicomechanical properties of the cement is not known.
The purpose of this study was to evaluate the compressive strength and solubility of conventional restorative glass ionomer cement following the addition of propolis.
Twenty half cylindrical samples were prepared with conventional restorative glass ionomer cement formed the control group. Another twenty samples were prepared with propolis added to conventional restorative glass ionomer cement formed the experimental group. The compressive strength was assessed using universal testing machine. To assess solubility, the samples were immersed in deionised water at room temperature, for 7 days. The solubility was measured as a difference in the weight of the sample; prior to immersion and following immersion at the end of each day.
The control group had a significantly higher mean compressive strength of 146.26 Mpa as compared to the experimental group (135.06 Mpa). The solubility between the groups was significant.
In comparison to the control group, incorporation of propolis to conventional restorative glass ionomer cement decreased the compressive strength significantly. The solubility of the cement in the experimental group increased significantly over 7day period as compared to the control group.
蜂胶是蜜蜂产生的一种天然树脂状物质。已表明添加蜂胶可改善玻璃离子水门汀的抗菌效果；然而，其对水门汀物理机械性能的影响尚不清楚。
本研究的目的是评估添加蜂胶后传统修复性玻璃离子水门汀的抗压强度和溶解性。
用传统修复性玻璃离子水门汀制备20个半圆柱形样品作为对照组。另外20个样品在传统修复性玻璃离子水门汀中添加蜂胶制备作为实验组。使用万能试验机评估抗压强度。为评估溶解性，将样品在室温下浸入去离子水中7天。溶解性通过样品浸入前后每天结束时的重量差异来测量。
与实验组（135.06 Mpa）相比，对照组的平均抗压强度显著更高，为146.26 Mpa。两组之间的溶解性有显著差异。
与对照组相比，在传统修复性玻璃离子水门汀中加入蜂胶会显著降低抗压强度。与对照组相比，实验组水门汀在7天内的溶解性显著增加。
