调拌方式对玻璃离子水门汀充填体抗压强度的影响

Effect of different mixing methods on the compressive strength of glass ionomer cements

目的探讨不同的调拌方式对玻璃离子水门汀充填体抗压强度的影响,为临床操作者在牙体缺损充填治疗中玻璃离子水门汀的正确使用提供方法指导。方法除调拌方式外,为控制无关变量,每组其余变量均控制相同。按照临床常用玻璃离子水门汀调拌方式的技术要求,分别用单向顺时针旋转法(Ⅰ组)、单向逆时针旋转法(Ⅱ组)、正反双向交替旋转法(Ⅲ组)和上下提拉折叠法(Ⅳ组)等4种临床常用的调拌方法调拌玻璃离子水门汀材料各5份,充入抗压强度测试专用模具。待其完全凝固后,测试其抗压强度并进行统计分析。结果上下提拉折叠法与其余3种方法调拌的玻璃离子水门汀充填体抗压强度比较,差异均有统计学意义(P<0.05)。Ⅳ组(上下提拉折叠法)的玻璃离子水门汀充填体抗压强度强度显著低于Ⅰ、Ⅱ、Ⅲ组,差异均有统计学意义(P<0.05)。结论临床上使用玻璃离子水门汀材料时,建议采用单向顺时针旋转法、单向逆时针旋转法、正反双向交替旋转法,同时需进一步严格调拌要求,提升材料调拌的合格率。

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(groupⅢ)and the pulling and pushing with folding method(groupⅣ),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 groupⅣwas significantly lower(pulling and pushing with folding method)than that in groupsⅠ,ⅡandⅢ,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.