New adhesive methods of direct metal restorative materials

银镜像反应表面处理：采用一种新的表面处理方法，在不使用固接剂的情况下促进直接金属修复材料与牙体的结合。氨态硝酸银溶液的银镜反应是利用甲醛中醛基的还原能力在室温和短时间内作用于牙齿表面。由于直接金属修复材料中析出的金属银与汞和（或）镓作为液态金属发生反应，直接金属修复材料在不使用固牙剂的情况下将牙体固定得很紧。通过牙表面的金属银，直接金属修复材料与牙体的界面处没有结构间隙。银汞合金粘接方法的改进：测定了银汞合金（分散剂：DA）和镓合金（镓合金GF: Ga-GF）与牛牙物质的抗压剪切粘接强度（CSBS）。特别研究了酸作为羟基磷灰石增溶剂和次氯酸钠作为胶原增溶剂对牙本质表面的处理方法。牙本质表面由富含胶原蛋白状态转变为富含羟基磷灰石状态后，其粘附性有明显改善。含Panavia EX （+ Clearfil new bond）的DA和Ga-GF与牙本质的CSBS分别为9.7Mpa和30Mpa。Ga-GF在树脂水泥与牙体界面处的内应力在固化膨胀时的松弛是Ga-GF对DA的粘附优势的主要原因。新型粘结单体：含N，N'-二硫基和羧基的多功能单体N，N'-二甲基丙烯酰半胱氨酸底漆用于牙硬组织（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胶合剂的附着力。该处理剂有效地提高了TBBO引发剂对贵金属、半贵金属和非贵金属合金的粘接强度。而引物对牙用金属合金与Panavia-21（含bpo胺的三元引发剂）的结合强度没有明显的增强作用。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