Study on enhancing adhesion of dental aghesive restorative materials to tooth hard tissue.

各种粘合促进剂已经开发出来，并得到了广泛的应用。然而，牙本质作为粘附物的治疗是一个更重要的问题。本研究评价了窝洞前处理对牙本质标记复合树脂修复体微渗漏的影响。对牛牙唇面进行研磨，直至牙本质暴露。两个标准的圆形空洞并排制备。用3%乳酸铝、10%抗坏血酸、10%柠檬酸和10%磷酸四种清洗剂对其中一个空洞进行清洗60秒。另一辆被遗弃，没有打扫。粘接后，将复合树脂插入洞内。修复后的牙齿在染料中浸泡24小时后进行热循环，单纯的牙本质粘结剂不能阻止染料渗入颈部牙本质边缘，粘接前用一些清洁剂对牙本质进行预处理可以有效地减少微渗漏。用激光照射涂抹层表面，在扫描电子显微镜下观察其变化。散焦采用了Nd-YAG激光和CO_2激光。结果表明，两种激光都能引起涂抹层的变化。根据照射程度的不同，牙本质上的涂抹层得到了满意的处理，管口关闭。接下来，我们测定了在不同条件下，两种激光照射牙本质表面时，1%亚甲基蓝对牙本质表面的渗透率。研究发现，当染料应用于未受照射的牙本质表面时，染料渗透到整个区域，而受照射的表面阻止了染料的渗透。在25-50J/cm^2的低能量密度下也观察到了这一发现，从保存牙髓的角度来看，这是非常有趣的。

Various adhesion promoters have been developed and are in wide use. However, the treatment of the dentin as an adherent is a more important issue. This study evaluated the effects of the pretreatment of the cavity on microleakage of the composite resin restorations with dentin margens. The labnial surfaces of bovine teeth were ground until the dentin was exposed. Two standardized round cavities were prepared side by side. Four kinds of cleaning agents; 3% aluminum lactate, 10% ascorbic acid, 10% citric acid and 10% phosphoric acid were applied for 60 seconds to one of the two cavities. The other was left without cleaning. After bonding, a composite resin was inserted into cavity. The restored teeth were thermocycled, prior to immersion in dye for 24 hours.The dentin bonding agent singly could not prevent dye penetration at the cervicaal dentin margin, and prior to bonding the pretreatment of dentin with some cleaning agents was effective for decreasing microleakage.We investigated the possibility of treating the smear layer by laser irradiation. The surface of the smear layer was irradiated with a laser, and the changes were observed under a scanning electron microscope. A Nd-YAG laser and CO_2 laser were used in defocus. The results showed that both lasers induced changes in the smear layer. Depending on the irradiation level, the smear layer on the intertubular dentin was satisfactorily treated, with the tubular orifices closed.Next, we determined the penetration of 1% methylene blue form the dentin surface when irradiated by both lasers under various conditions. It was found that while the dye applied to a non-irradiated dentin surface penetrated deeply over the entire area, an irradiated surface blocked dye penetration. This finding was also observed at low energy densities of 25-50 J/cm^2,which is very interesting from the standpoint of preserving dental pulp.