Moody C R, DeWald J P, Ferracane J L
Department of Operative Dentistry, Baylor College of Dentistry, Dallas, Tex.
J Prosthet Dent. 1989 Nov;62(5):527-9. doi: 10.1016/0022-3913(89)90072-3.
This study compared bond strengths of zinc phosphate and polycarboxylate cements in cementing cast gold crowns to composite resin cores. The study also compared the effect of thermocycling on the bond strengths in tension of the two cements under varied storage and thermocycling conditions. Sixty standard cores were made from composite resin material. Gold alloy crowns were cast for each core and cemented with zinc phosphate or polycarboxylate cement. The samples were stored for 1 day or 1 month and then cycled with 60-second dwell times between 5 degrees C and 55 degrees C distilled water baths for 5, 100, or 1000 cycles. The controls were stored for the same periods and were not cycled. Overall comparison of both storage periods and all cycled and noncycled groups revealed that zinc phosphate cement had significantly higher bond strengths than polycarboxylate cement. Increasing the storage time before cycling significantly increased the bond strengths for both cements. There was no difference between any of the cycle periods or the noncycled controls for either cement.
本研究比较了磷酸锌水门汀和聚羧酸锌水门汀在将铸造金冠粘结到复合树脂核上时的粘结强度。该研究还比较了在不同储存和热循环条件下，热循环对这两种水门汀拉伸粘结强度的影响。用复合树脂材料制作了60个标准核。为每个核铸造金合金冠，并用磷酸锌或聚羧酸锌水门汀粘结。将样本储存1天或1个月，然后在5℃和55℃的蒸馏水浴之间以60秒的停留时间循环5次、100次或1000次。对照组储存相同时间且不进行循环。对两个储存期以及所有循环和未循环组的总体比较显示，磷酸锌水门汀的粘结强度显著高于聚羧酸锌水门汀。在循环前增加储存时间显著提高了两种水门汀的粘结强度。对于任何一种水门汀，循环次数或未循环对照组之间均无差异。
