Momoi Y, Asami Y, Ozawa M, Kohno A
Tsurumi University, School of Dental Medicine, Department of Operative Dentistry, Yokohama, Japan.
Oper Dent. 1996 Jan-Feb;21(1):12-6.
Good wettability is one of the desirable physical properties of mercury-free gallium-based alloys (Gallium Alloy GF). However, wettability, while providing good adhesion to the cavity wall, has the adverse effect of causing stickiness to the inside of the capsule during mixing, and also to the metal hand instruments used for packing. To control this stickiness the alloy mixture was treated with a small amount of alcohol using two different methods. In both groups (alcohol-added and alcohol-treated groups), 5, 10, or 15 microliters of alcohol was added. However, for the alcohol-treated group, the alcohol was shaken from the mixture. In both groups, remarkable improvement was seen in their handling properties, for the alloy mixture did not adhere to the inside of the capsule and was easily taken out as one mass. Compressive strength, tensile strength, and creep were tested in the alcohol-added/-treated groups, and compared with those of a control (conventionally mixed gallium alloy) and a high-copper amalgam (Spherical-D). All tests were done according to ISO 1559 (International Organization for Standardization, 1986), and the results were analyzed using one-way ANOVA (Duncan, P < 0.05). Surface microhardness (KHN) and dimensional change during hardening were evaluated according to ISO 1559 and compared to the control results. In mixing Gallium Alloy GF, an addition of less than 5 microliters of alcohol had the effect of preventing the alloy mixture from sticking to the inside of the capsule and remarkably enhanced the handling properties. This suggested mixing technique did not alter either the mechanical properties tested for this material or the desirable dimensional expansion that occurs during hardening.
良好的润湿性是无汞镓基合金（镓合金GF）理想的物理性能之一。然而，润湿性虽然能使材料与洞壁良好黏附，但在混合过程中会导致材料黏附在胶囊内部，以及用于填充的金属手持器械上，产生不利影响。为了控制这种黏性，采用两种不同方法用少量酒精对合金混合物进行处理。在两组（添加酒精组和酒精处理组）中，均添加了5、10或15微升酒精。然而，对于酒精处理组，酒精从混合物中被摇晃出来。在两组中，其操作性能均有显著改善，因为合金混合物不再黏附于胶囊内部，且很容易作为一个整体取出。对添加酒精/经过酒精处理的组进行了抗压强度、抗拉强度和蠕变测试，并与对照组（传统混合镓合金）和高铜汞合金（球形-D）进行比较。所有测试均按照ISO 1559（国际标准化组织，1986年）进行，结果采用单向方差分析（邓肯检验，P<0.05）进行分析。根据ISO 1559评估表面显微硬度（KHN）和硬化过程中的尺寸变化，并与对照结果进行比较。在混合镓合金GF时，添加少于5微升酒精可防止合金混合物黏附于胶囊内部，并显著提高操作性能。这种混合技术并未改变该材料所测试的力学性能，也未改变硬化过程中发生的理想尺寸膨胀。
