Study on Resin-modified Glass-ionomer Restorative Materials for Geriatric Dentistry -Marginal Gap, Bonding, Polishing Method-

本文研究了老年人口腔修复材料在水中贮存对边缘间隙形成的影响。通过对玻璃离子材料的粘结强度和弯曲强度的测定，探讨了边缘间隙形成对修复体固位强度的影响。形成约15 μ m的边缘间隙。相比之下，当抛光后储存在水中的边缘间隙为0至2微米的树脂改性玻璃离子修复材料。玻璃离子与牙釉质和牙本质的粘结强度和玻璃离子的弯曲强度在水中储存后增加。玻璃离子牙体在水中储存时，由于吸湿膨胀，其边缘密封性得到改善，同时其粘接强度也得到提高，因此，在水中储存后进行抛光更有利于老年牙科领域的应用。

The effect of storage in water on marginal gap formation using resin-modified glass-ionomer restorative materials for geriatric dentistry were evaluated The bond and flexural strengths of the glass-ionomer materials were examined to determine the influence that marginal gap formation has on retention strengths of the restorations.When the cavity preparations were filled with a glass-ionomer and polioshed immediately after setting, a marginal gap of approximately 15 mum was formed. In contract, when polishing following storage in water the marginal gap was 0 to 2 mum for the resin-modified glass-ionomer restorative materials. The bond strength of the glass-ionomer to enamel and to dentin and the flexural strength of the glass-ionomer increased after storage in water. The marginal seal of glass-ionomer restorations may not only be improved due to hygroscopic expansion during storage in water but also may exhibit greater bond strength.Therefore polishing following storage in water is more beneficial for geriatric dental field.