Yamazaki Atsushi, Hibino Yasushi, Honda Muneaki, Nagasawa Yuko, Hasegawa Yoshiaki, Omatsu Jun, Yamaga Taniichiro, Nakajima Hiroshi
Division of Dental Biomaterials Science, Department of Restorative and Biomaterials Sciences, Meikai University School of Dentistry.
Dent Mater J. 2007 Sep;26(5):708-12. doi: 10.4012/dmj.26.708.
This study examined the effect of ambient water on the shear strength of glass ionomer cements for luting. Disk specimens were fabricated from four commercially available glass ionomer cements with different setting modes. At one hour after the start of mixing, the specimens were stored at 37 degrees C for 24 and 168 hours in dry condition or in deionized water. Shear strength was then determined using a punch tool. The shear strengths of both conventional cements were significantly greater for the specimens stored dry as compared to those kept in deionized water (p < 0.05). Conversely, resin-modified cement specimens stored dry had significantly lower strength compared to the specimens kept in deionized water (p < 0.05). This was because the ambient water surrounding the resin-modified glass ionomer cements helped increase the shear strength of the cements under the experimental conditions tested.
本研究考察了环境水对用于粘接的玻璃离子水门汀抗剪强度的影响。用四种具有不同凝固方式的市售玻璃离子水门汀制作圆盘试样。混合开始一小时后，将试样在37℃下干燥条件或去离子水中分别保存24小时和168小时。然后使用冲压工具测定抗剪强度。与保存在去离子水中的试样相比，两种传统水门汀干燥保存的试样抗剪强度显著更高（p<0.05）。相反，与保存在去离子水中的试样相比，干燥保存的树脂改性水门汀试样强度显著更低（p<0.05）。这是因为在测试的实验条件下，树脂改性玻璃离子水门汀周围的环境水有助于提高水门汀的抗剪强度。
