Improvement of Dentin Cavity Adaptation of Visible Light Activated resin Composite.

为了获得牙科复合材料与牙本质腔壁的边缘完整性，由牙本质清洁剂、牙本质引物和牙本质粘结剂组成的牙本质粘结系统的有效性决定。而对牙本质结合体系的首要要求是克服复合材料的聚合收缩应力。尽管牙本质黏合剂的发展非常显著，但牙本质黏合剂的最佳组合还没有建立起来。我们已经报道过，牙本质清洁剂涂抹层下的脱钙程度与收缩间隙宽度的增加有关。在接下来的阶段，我们确定，如果在商业牙本质引物中加入高效的牙本质粘接剂，则可以消除其中的戊二醛。因此，认为35%的甲基丙烯酸羟乙酯已在临床应用，并已由日本牙科制造商推向市场。然而，我们声称，虽然HEMA溶液在频繁接触牙本质引物后会导致操作者指尖出现接触性皮炎，但它不仅能有效地提高粘接效率，还能有效地镇静牙本质的过敏反应。本研究的目的是开发一种完全防止牙本质收缩间隙形成且对软组织无副作用的牙本质引物。在这几年里，我们报道了两种单体，甲基丙烯酸甘油酯和赤藓糖醇甲基丙烯酸酯，它们完全阻止了间隙的形成。还需要更多的努力来检验这两种单体的可能性。在牙本质粘结剂的应用和树脂复合填充的步骤中，粘结机理的细节尚未完全确定。在我们对各种商业产品的粘接效果的研究中，四种商业牙本质粘接剂可以有效地提高复合材料的边际适应性，尽管复合材料的力学性能与边际完整性直接相关，但没有定义。少

In order to obtain the marginal integrity of the dental composite to the dentin cavity wall is determined by the efficacy of the dentin bonding system which are composed of the dentin cleanser, dentin primer and the dentin bonding agent. And the primary requirement for the dentin bonding system is to overcome the polymerization contraction stress of the composite. In spite of the remarkable development of the dentin dentin adhesives, the optimum combination of the dentin bonding system has not been established. We have already reported that the degree of the decalcification beneath the smear layer by the dentin cleanser correlated with the increase of the contraction gap width. In the next stage, we defined that the glutaraldehyde in the commercial dentin primer was possible to be eliminated if it was followed by the highly effective dentin bonding agent. Therefore, it was concluded that the 35% hydroxyethyl methacrylate was practiced in clinic and it was marketed by a Japanese dental … More manufacturer. However, we have claimed that HEMA solution was effective not only on the improvement of the bonding efficacy but also the sedation of the hypersensitivity of the dentin although it caused the contact dermatitis on the finger tip of the operator after frequent contact with the dentin primer. The purpose of the present investigation is to develop the dentin primer which prevent the contraction gap formation completely and never cause the side effect on the soft tissue. In this couple of years, we reported two monomers, glyceryl methacrylate and erythritol methacrylate, by which the gap formation was prevented completely. More effort is still required to examine the possible by these two monomers. In the steps of the dentin bonding agent application and the resin composite filling, the details of the bonding mechanism has not been defined completely. In our examination of the bonding efficacy of various commercial products, four commercial dentin bonding agents was effective to improve the marginal adaptation of the composite although the mechanical property of the composite which directly correlate with the marginal integrity was not defined. Less