义齿用基托软衬厚度比与断裂行为的实验研究

Research on Different Soft Liner/Base Resin Thickness Ratios And Fracture Behavior of Denture Base

制作规格为60.0mm×25.0mm×3.0mm不同软衬/基托树脂厚度比试件6组,软衬/基托树脂厚度比分别为0∶3.0、0.5∶2.5、1.0∶2.0、1.5∶1.5、2.0∶1.0、2.5∶0.5,通过万能实验机进行塑料弯曲性能实验,计算每组试件的挠曲强度及回弹性,所得结果用SPSS13.0软件包进行统计分析。随软衬材料厚度增加,试件挠曲强度降低,回弹性增加,在厚度比为1.5∶1.5～2.0∶1.0范围内,两者变化趋于稳定。在本实验条件下得出结论,软衬材料厚度不宜大于2mm;在热凝型丙烯类软衬义齿临床制作过程中,建议按照基托整体厚度调整软衬材料/基托树脂的厚度比,使其控制在1/1～2/1范围内。

Six groups of soft liner/base resin were made into standard test samples of 60.0 mm×25.0 mm× 3.0 mm, with different soft lining materials/base resin ratios of 0 ： 3.0, 0.5 ： 2.5, 1.0 ： 2.0, 1.5 ： 1.5, 2.0 ： 1. 0, 2.5 ： 0. 5. The yield strength and resilience of each group were tested by universal testing machine. We found that when the thickness of soft liner increased, the yield strength of samples was reducing, whereas the resilience was enhancing. The change of yield strength and resilience became stabilized between the ratio of 1.5 ： 1.5 to 2.0 ： 1.0. We concluded that, under this testing condition, the thickness of soft liner should not exceed 2.0 mm,and we suggested that the ratio of soft liner/base resin should be controlled within the scope of 1/1 to 2/1 according to the whole base thickness.