正畸用热压膜材料的力学性能分析

目的 测量并比较不同品牌热压膜材料在不同处理方式下的力学性能,分析影响热压膜材料力学性能的因素,为临床更有效地提高无托槽隐形矫治技术的效能提供依据.方法 选用市场上常见的3种品牌的热压膜材料,包括DR、Biolon和Erkodent膜片.应用万能材料试验机分别测量3种热压膜材料在未处理、热成形后和人工唾液浸泡2周后的最大应力和弹性模量,所得数据用SPSS 11.5软件包进行单因素方差分析,比较不同处理方式对材料力学性能的影响.结果 未处理组的弹性模量(MPa)和最大应力(MPa)均高于热成形组,差异均有统计学意义(DR:9.63±0.68比7.85±0.61、267±8比199±6,Erkodent:8.28±0.28比7.59±0.45、226±6比199±6,Biolon:8.85±0.41比7.07±0.22、237±6比169±7,均P<0.05).热成形组的弹性模量(MPa)和最大应力(MPa)均低于唾液浸泡组,差异均有统计学意义(DR:7.85±0.61比9.14±0.41、199±6比212±7,Erkodent:7.59±0.45比8.38±0.29、199±6比212±7,Biolon:7.07±0.22比7.90±0.31、169±7比197±5,均P<0.05).结论 不同品牌的热压膜材料具有不同的拉伸力学性能,不同的处理方式对材料的力学性能影响不同,热成形后材料的力学性能降低,唾液浸泡后,材料的力学性能升高.

Mechanical properties of thermoplastic materials

Objective To investigate the mechanical properties of various brands of thermoplastic materials under different test conditions so as to analyze their influencing factors so as to provide a reference for improving the effect of invisible orthodontics.Methods Three brands of thermoplastic materials,DR,Biolon and Erkodent,were selected.They were tested by Instron testing machine to measure their maximal stress and modulus under different processing modes,including pre-thermoforming,post-thermoforming and dipped in artificial saliva for two weeks after thermoforming.The data were analyzed by SPSS 11.5.Analyzed the mechanical properties change-trend under each test condition.Results The modulus (MPa)and maximum stress (MPa) of control group were significantly higher than those of thermoforming group (DR:9.63±0.68 vs 7.85±0.61,267±8 vs 199±6; Erkodent:8.28±0.28 vs 7.59±0.45,226±6 vs 199±6;Biolon:8.85±0.41 vs 7.07±0.22,237±6 vs 169±7,all P < 0.05).The modulus (MPa) and maximum stress(MPa) of thermoforming group were significantly lower than those of saliva immersion group (DR:7.85±0.61 vs 9.14±0.41,199±6 vs 243±7; Erkodent:7.59±0.45 vs 8.38±0.29,199±6 vs212±7; Biolon:7.07 ±0.22 vs 7.90 ±0.31,169 ±7 vs 197 ±5,all P<0.05).Conclusions The different brands of thermoplastic materials have different mechanical properties.The different processing modes influence the mechanical properties of thermoplastic materials.The mechanical properties decrease after thermoforming and increase after saliva immersion.