Study on Restorative Materials for Geriatric Dentistry - Light-activated Glass Ionomer -

研究抛光时间对玻璃离子修复体边缘间隙形成的影响。分别于光激活后即刻、浸泡1天、浸泡7天，测定光激活玻璃离子修复体的边缘间隙（牙釉质或牙釉质洞）。常规玻璃离子修复体作为对照。两种玻璃离聚物在光活化或固化后立即在牙釉质处具有约0.4%的间隙，在牙釉质腔处具有约1%的间隙。在水中浸泡1天后，两种玻璃离聚体的边缘间隙显著减小。光活化玻璃离子的间隙比传统玻璃离子的间隙小.测定抛光时间对三种光活化玻璃离子修复材料与预备牙界面差距宽度的影响。一种光激活玻璃离子类似物，一种常规固化玻璃离子修复材料， 关于我们 使用新的光固化复合材料作为对照。在凝固后立即抛光或在水中浸泡1天后进行修复。在水中浸泡1天后抛光的所有试样的边缘间隙宽度明显小于凝固后立即抛光的试样。对减小边缘间隙宽度、提高吸水率、提高力学性能和对牙体结构的粘结能力有显著效果.测定了抛光时间对光活化玻璃离子、光活化玻璃离子类似物和常规固化玻璃离子表面与V类洞之间差距的影响。在凝固后立即抛光或在水中浸泡1天后进行修复。间隙的测定是用轴向切片试样进行的。在水中浸泡1天后抛光的试样的间隙数量明显小于凝固后立即抛光的试样。在水中浸泡1天后抛光这些抛光物更有利于临床实践。少

Effect of polishing period on marginal gap formation of commercially available glass ionomer restoration was investigated :1. Marginal gap (either at enamel or at teflon cavity) of a light activated glass ionomer for restoration was determined immediately after light-activation, 1 day, 7 days following immersion in water. A conventional glass ionomer for restoration was used as control. Two glass ionomers had gaps of about 0.4 % at enamel and about 1 % at teflon cavities, immediately after light-activation or setting. Following 1 day immersion in water, marginal gap of two glass ionomers became significantly decreased. The gaps of light-activated glass ionomer were smaller than those of conventional one.2. Effect of the polishing period on the gap width at the interface between the prepared tooth and the three light-activated glass ionomer restorative materials was determined. One light-activated glass ionomer analogous, one conventionally-cured glass ionomer restorative material and o … More ne light-cured composite were used as control. Restorations were made following by either polished immediately after the set or after 1 day immersion in water. The marginal gap width for all specimens polished following 1 day immersion in water was apparently smaller than those of immediately after the set. To reduce the marginal gap width, water absorption, increasing of the mechanical property and the bond ability to tooth structure would have a significant effect.3. Effect of the polishing period on the gap between Class V cavity and light-activated glass ionomer, light-activated glass ionomer analogous and conventionally-cured glass ionomer restorations were determined. Restorations were made following by either polished immediately after the set or after 1 day immersion in water. Determination of gaps were made with axially sectioned specimens. Number of gaps for specimens polished following 1 day immersion in water was apparently smaller than those of immediately after the set. Polishing of these restorations after 1 day immersion in water is more beneficial for clinical practice. Less