Goto Shin-ichi, Churnjitapirom Pornkiat, Miyagawa Yukio, Ogura Hideo
Department of Dental Materials Science, School of Life Dentistry, Niigata, The Nippon Dental University, 1-8 Hamaura-cho, Chuuou-ku, Niigata 951-8580, Japan.
Dent Mater J. 2008 Sep;27(5):678-86. doi: 10.4012/dmj.27.678.
The purpose of this study was to investigate the effects of three additives, Sn, Ga, and In, as well as the main constituents, Pd and Cu, of Ag-Pd-Au-Cu alloys on the initial bond strength of 4-META adhesive cement to these alloys. The Ag-Pd-Au-Cu alloys consisted of 20%, 30% or 40% Pd, and 10%, 15% or 20% Cu, 20% Au, and Ag as balance. Besides, additive metals (Sn, Ga, and In) of 2% and 4% were added to these compositions. The addition of three additives, in general, increased the initial bond strength of the cement in comparison to the mother compositions (0% additives), although the degrees of effectiveness of the three additives were different and varied with their contents. Among these additives, a remarkable increase in bond strength was observed with the addition of In. The increase in Cu content, in many cases, resulted in an increase in bond strength at high Pd contents (30% and 40%), but a decrease at low Pd content (20%) in some cases. The positive effects of the three additives and Cu could be due to the formation of a suitable oxide layer for strong bonding with 4-META.
本研究的目的是调查银钯金铜合金的三种添加剂锡、镓和铟以及主要成分钯和铜对4-META粘结水门汀与这些合金之间初始粘结强度的影响。银钯金铜合金由20%、30%或40%的钯、10%、15%或20%的铜、20%的金以及余量的银组成。此外，向这些成分中添加了2%和4%的添加剂金属（锡、镓和铟）。总体而言，与母成分（0%添加剂）相比，三种添加剂的添加提高了水门汀的初始粘结强度，尽管这三种添加剂的有效程度不同且随其含量而变化。在这些添加剂中，添加铟后观察到粘结强度显著提高。在许多情况下，铜含量的增加在高钯含量（30%和40%）时导致粘结强度增加，但在某些情况下，在低钯含量（20%）时导致粘结强度降低。三种添加剂和铜的积极作用可能是由于形成了与4-META牢固粘结的合适氧化层。
