Taira Y, Imai Y
Department of Fixed Prosthodontics, School of Dentistry, Nagasaki University, Japan.
Dent Mater. 1995 Jan;11(1):2-6. doi: 10.1016/0109-5641(95)80001-8.
The purpose was to examine the effect on the bond strength and durability of a resin bond to metal of modification of a primer consisting of thiophosphoric methacrylate with phosphoric methacrylates and/or benzoyl peroxide.
Acrylic rods were bonded with a luting resin consisting of poly(methyl methacrylate) powder and a mixture of methyl methacrylate and tributylborane initiator to silver-palladium alloy (Ag-Pd), gold-silver alloy (Au-Ag), cobalt-chromium alloy (Co-Cr), and titanium (Ti) surfaces treated with various primers. The bonded samples were thermocycled for 2,000 cycles and the mean bond strengths were compared using one-way ANOVA and Duncan's new multiple range test at p < 0.05.
Using primers of thiophosphoric methacrylate or phosphoric methacrylates alone, the bond strengths of Ag-Pd decreased significantly (p < 0.05) after thermocycling. The durability was significantly improved (p < 0.05) when thiophosphoric methocrylate was used in combination with the phosphate monomers. The additional use of benzoyl peroxide and heat treatment resulted in a significant increase (p < 0.05) in the durability of two groups; the mean bond strengths over 20 MPa and the lowest values remained unchanged even after 2,000 thermocycles.
The highest level of bond strength and durability to dental noble metals was achieved using a mixture of thiophosphoric and phosphoric methacrylates and benzoyl peroxide. These bond strength results are comparable to values obtained for base metals.
本研究旨在探讨由甲基丙烯酸硫代磷酸酯与甲基丙烯酸磷酸酯和/或过氧化苯甲酰组成的底漆改性对树脂与金属结合强度及耐久性的影响。
将由聚甲基丙烯酸甲酯粉末以及甲基丙烯酸甲酯与三丁基硼烷引发剂的混合物组成的粘结树脂与经不同底漆处理的银钯合金（Ag-Pd）、金银合金（Au-Ag）、钴铬合金（Co-Cr）和钛（Ti）表面的丙烯酸棒进行粘结。对粘结后的样品进行2000次热循环处理，并使用单因素方差分析和邓肯新复极差检验在p<0.05水平比较平均粘结强度。
单独使用甲基丙烯酸硫代磷酸酯或甲基丙烯酸磷酸酯底漆时，热循环后Ag-Pd的粘结强度显著降低（p<0.05）。当甲基丙烯酸硫代磷酸酯与磷酸单体联合使用时，耐久性显著提高（p<0.05）。额外使用过氧化苯甲酰和热处理导致两组的耐久性显著提高（p<0.05）；即使经过2000次热循环，平均粘结强度超过20MPa且最低值保持不变。
使用甲基丙烯酸硫代磷酸酯、甲基丙烯酸磷酸酯和过氧化苯甲酰的混合物可实现对牙科贵金属的最高结合强度和耐久性。这些粘结强度结果与贱金属获得的值相当。
