New adhesive methods of direct metal restorative materials

利用银镜反应进行表面处理：采用新的表面处理方法，促进直接金属修复材料与牙体之间的粘结，无需粘结剂。利用甲醛中醛基团的还原能力，使氨性硝酸银溶液在室温和短时间内在牙齿表面发生银镜反应。由于金属银的产物在牙面上以液态金属的形式与汞和/或镓反应，直接法修复材料不需要粘结剂就能牢固地固定在牙体上。银汞合金粘结方法的改进：用…对银汞合金(分散合金：DA)和镓合金(GF：Ga-GF)的压剪粘结强度进行了研究测定了多种商品粘结剂和树脂粘结剂对牛牙本质的粘结效果。重点研究了以酸为羟基磷灰石增溶剂、次氯酸钠为胶原增溶剂对牙本质表面进行处理的方法。牙本质表面由富胶原状态转变为富含羟基磷灰石状态，粘附性明显改善。结果表明，DA和GA-GF与牙本质结合的CSBS分别为9.7 Mpa和30 Mpa。树脂粘结剂与牙本质界面的内应力对树脂粘结剂的聚合收缩的内应力膨胀的松弛是Ga-GF在粘接中优于DA的主要原因。新型粘接单体：含有N，N‘-二甲基丙烯酰半胱氨酸的底漆，作为一种多功能单体，带有二硫基和羧基，用于牙齿硬组织(牙釉质和牙本质)的表面处理，牙科金属合金提高了粘结剂和树脂粘固剂的粘附力。该底漆有效地提高了Superond(TBBO引发剂)与贵金属、半贵金属和非贵金属合金的结合强度。然而，该底漆不能有效地提高Panavia-21(含BPO-胺的三元钝化剂)与牙科金属合金的粘结强度。较少

Surface treatment by the use of silver-mirrorreaction : New surface treatment method for promoting the bonding of direct metal restorative materials and tooth substance without cementing agent was applied. The silver-mirror reaction of ammoniacal silver nitrate solution by the use of rducing power of aldehyde group in formaldehyde enabled on the tooth surface at the room temperature and short time. As the resuts of metallic silver, which phates out on the tooth surface, reacts with mercury and/or gallium as a liquid metals in the direct methal restorative materials, direct methal restorative materials were fixed tightly without cementing agent on the tooth substance. Furthermore, there is no construction gap at the interface of direct metal restorative materials and tooth substance through metallic silver on the tooth surface.Improvement of amalgam-bonding method : The compressive shear bond strength (CSBS) of amalgam (Dispersalloy : DA) and gallium alloy (Gallium alloy GF : Ga-GF) wit … More h commercial bonding agents and resin cements to the bovine tooth substance were determined. Especially, it was examined the method of the dentin surface treatment with acid as a hydroxyapatite solubilizer and sodium hypochlorite as a collagen solubilizer. Changing in state from the collagen rich to the hydroxyapatite rich on the dentinal surface took remarkable improvement in adhesion. The CSBS of DA and Ga-GF with Panavia EX (+ Clearfil new bond) to the dentin was 9.7Mpa and 30Mpa, respectively. The relaxation on setting expansion of Ga-GF of the internal stress on the polymerization shrinkage of the resin cement at the interface between resin cement and tooth substance was main reason that could be explained the advantage to Ga-GF to DA in adhesion.New adhesive monomer : The primer containing N,N'-dimethacryloylcystine, as a multifunctional monomer, with disulfide and carboxyl groups was utilized for surface treatment of tooth hard tissues (enamel and dentin) and dental metal alloys improve the adhesion of bonding agents and resin cements. The primer effectively enhanced the bond strength of Superbond (TBBO iniciator) to precious, semi-precious and nonprecious metal alloys. However, the primer ineffectively enhanced the bond strength to Panavia-21 (ternary iniciator with BPO-amine) to dental metal alloys. Less