Film thickness and rheological properties of luting agents for crown cementation.
Film thickness and rheological properties of luting agents for crown cementation.
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牙冠粘接用固定剂的膜厚和流变特性。
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
A. Walls
中科院分区：
文献类型：
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作者：
S. Osman;J. Mccabe;A. Walls
比较了Panavia 21、Superond、All Bond C&B粘固剂、Variolink等不同树脂基冠桥粘固剂与磷酸锌粘固剂的膜厚和流变性(粘度和tan sigma)。用改进的ISO 9917(1991)方法和受控应力流变仪分别监测了薄膜厚度和流变性的变化。对于每种材料，在开始混合后的60s测定薄膜厚度和流变性，然后以规则的间隔进行测量，直到材料凝固之前。对于初始膜厚，Varionk、Superond和磷酸锌粘固剂之间的值差异不显著(P>；0.05)，小于25微米。所有Bond C&B水泥和Panavia 21的价值至少是其他测试材料的两倍。所有Bond C&B水泥在初始阶段和240秒时都产生了最高的膜厚值。在粘度方面，Superond的初始值最低，但在240秒时最高。Variolink提供的粘度初值最高，但其他材料之间的初值差异较小。在整个测试期间，磷酸锌粘固剂的tan sigma值最高，Panavia 21在任何测量的性能上都没有显著变化。这些方法能够区分不同水泥材料的性能。一些树脂粘结剂产生的膜厚大于最佳值，在某些情况下，这与混合后粘度迅速增加有关。预计粘固剂形成薄膜的能力的差异将影响粘固性修复体的就位。
The film thickness and rheological properties [viscosity and tan sigma], of different resin based crown and bridge luting agents, including Panavia 21, Superbond, All Bond C&B Cement, Variolink were compared with zinc phosphate cement. A modification of the method in ISO 9917 (1991) and a controlled stress rheometer were used to monitor the changes in the film thickness and rheological properties respectively. For each material, the film thickness and rheological characteristics were determined at 60s after start of mixing and then made at regular intervals until immediately before the material was set. For the initial film thickness, the difference among the values for Varionk, Superbond and zinc phosphate cement was not significant (P>0.05), and less than 25microm. The values for All Bond C&B Cement and Panavia 21 were at least twice that of the other materials tested. All Bond C&B Cement produced the highest film thickness value at both the initial period and at 240s. Regarding viscosity, Superbond had the lowest initial value but the highest value at 240s. Variolink gave the highest initial value of viscosity, but the differences in the initial values among the other materials were small. During the whole period of testing, zinc phosphate cement gave the highest values of tan sigma, and Panavia 21 showed no significant change in any of the measured properties. The methods were able to distinguish the behaviour of different cement materials. Some resin cements produce larger than optimal values of film thickness and in some cases this is related to a rapid increase in viscosity after mixing. It is expected that differences in the ability of cements to form thin films will affect the seating of cemented restorations.