Effect of different mixing methods on the compressive strength of glass ionomer cements
QIU Tao1,2 CHEN Xinlei1,2 HUANG Juan1,2 YE Dan1,2 MAO Bochun1,2 XIAO Jingyi1,2 XU Qinghong1,2
1.State Key Laboratory of Oral Disease National Clinical Research Center for Oral Disease, Sichuan Province, Chengdu 610041, China;
2.Department of Pediatric Dentistry, West China Hospital of Stomatology, Sichuan University, Sichuan Province, Chengdu 610041, China
Abstract：Objective To investigate the effect of different mixing methods on the compressive strength of glass ionomer cement fillings, and to provide guidance for clinical operators in the correct use of glass ionomer cement in the filling treatment of tooth defects. Methods In order to control irrelevant variables, except mixing method, all other variables in each group were controlled the same. According to the technical requirements of the mixing methods of glass ionomer cement commonly used in clinic, four kinds of commonly used mixing methods were used to mix glass ionomer cement materials, namely, unidirectional clockwise rotation method (groupⅠ), unidirectional anticlockwise rotation method (groupⅡ), two-way alternating rotation method (group Ⅲ) and the pulling and pushing with folding method (group Ⅳ), with five copies of each method, and filled into a special mold for compressive strength testing. After it was completely solidified, its compressive strength was tested and statistical analysis was performed. Results Compressive strength of glass ionomer cement fillings prepared by pulling and pushing with folding method was compared with the other three methods, the differences were statistically significant (P < 0.05). The compressive strength of glass ionomer cement in group Ⅳ was significantly lower (pulling and pushing with folding method) than that in groups Ⅰ, Ⅱ and Ⅲ, the differences were statistically significant (P < 0.05). Conclusion Unidirectional clockwise rotation method, unidirectional anticlockwise rotation method and the alternate two-way rotation method should be recommended in clinical practice. At the same time, it is necessary to further strict mixing requirements to improve the qualification rate of material mixing.
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2019, Vol. 16 
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