Kakigawa H, Yokoyama Y, Tajima K, Hayashi I, Kozono Y
Shika Zairyo Kikai. 1989 Nov;8(6):783-9.
The retention of crowns cemented on abutment tooth model was examined for three types of luting cements when compressive loads of 2.5 to 10.0 kg were repeatedly applied to the occlusal plane. The chamfer type Ni-Cr alloy crown and abutment tooth model were prepared, and their surfaces to be cemented were sandblasted with glass beads. Loads were applied 7,200 times a day for 1, 3, or 7-day period after cementing. The polycarboxylate and zinc phosphate cements showed higher crown retentions than glass ionomer cements. Although retention strength of glass ionomer cements was significantly increased by storing the cemented specimen in water for 7 days, repeated loading tended to decrease retention. In polycarboxylate cements and one brand of zinc phosphate cement employed, retention strengths were decreased when stored in water over 3 days. However, their highest levels were maintained or even positively impacted by repeated loading for 7 days.
当在咬合面上反复施加2.5至10.0千克的压缩载荷时，研究了三种类型的粘结水门汀在基牙模型上粘结的冠的固位情况。制备了倒角型镍铬合金冠和基牙模型，并用玻璃珠对其待粘结表面进行喷砂处理。粘结后，每天施加7200次载荷，持续1、3或7天。聚羧酸锌水门汀和磷酸锌水门汀的冠固位力高于玻璃离子水门汀。尽管将粘结后的标本在水中储存7天可显著提高玻璃离子水门汀的固位强度，但反复加载往往会降低固位力。在使用的聚羧酸锌水门汀和一种品牌的磷酸锌水门汀中，在水中储存超过3天会降低固位强度。然而，经过7天的反复加载，它们的最高水平得以维持甚至受到积极影响。
