Effect of mixing methods on the compressive strength of glass ionomer cements
Effect of mixing methods on the compressive strength of glass ionomer cements
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DOI：
10.1016/s0300-5712(01)00010-0
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发表时间：
2001-03-01
影响因子：
4.4
通讯作者：
McCabe, JF
中科院分区：
文献类型：
--
作者：
Nomoto, R;McCabe, JF
目的：研究混合方法对牙用玻璃离子水门合剂抗压强度和孔隙率的影响。方法：选择5种玻璃离子水门剂进行研究。两种是手工混合的，三种是封装的。后者是通过摇晃或旋转混合的。在旋转混合后，一些样品在使用前进行离心。确定了每种水泥/混合方案组合的24 h抗压强度，并使用扫描电镜检查了断口表面。结果：混合方式对抗压强度有显著影响（P < 0.05）。对于衬砌水泥，手工搅拌可显著提高其抗压强度（P < 0.05）。对于修复体水泥，不同方法混合的试件抗压强度差异不大，手工搅拌的抗压强度明显低于旋转后离心搅拌的抗压强度（P < 0.05）。孔隙率纳入所有样品和低值的抗压强度与较大的孔隙。意义：玻璃离聚体水泥的强度受掺入孔隙率的影响，这取决于混合方法。对于一些水泥，为了减少孔隙率和增加强度，人工搅拌是有利的，但这通常不适用于所有水泥。2001爱思唯尔科学有限公司版权所有。
Objective: The purpose of the study was to evaluate the effect of the mixing method on the compressive strength and porosity of dental glass ionomer cements.Method: Five glass ionomer cements were chosen for use in the study. Two were hand mixed and three were encapsulated. The latter were mixed either by shaking or rotating. Following mixing by rotation some samples were centrifuged before use. The 24 h compressive strength was determined for each cement/mixing regime combination and fracture surfaces were examined using SEM.Results: The mixing method had a significant effect on compressive strength (P < 0.05). For the luting/lining cement, hand mixing produced a significantly greater compressive strength (P < 0.05). For the restorative cement, there were only small differences between specimens mixed by different methods and hand mixing gave a significantly lower compressive strength than mixing by rotation followed by centrifuging (P < 0.05). Porosity was incorporated in all samples and low values of compressive strength were associated with larger pores.Significance: The strength of glass ionomer cements is affected by incorporated porosity and this is dependent on the method of mixing. For some cements hand mixing is favoured in order to reduce porosity and increase strength brit this is not generally applicable to all cements. (C) 2001 Elsevier Science Ltd. All rights reserved.