热成形时间对正畸热压膜材料厚度和弹性模量的影响  

Effect of thermoforming time on the thickness and elastic modulus of orth-odontic thermoplastic materials

作　　者：石佳怡 张一苇 徐宝华[3] SHI Jiayi;ZHANG Yiwei;XU Baohua(General Department,Peking University Hospital of Stomatology,Beijing 100081,China;School of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Dental Medical Center,China-Japan Friendship Hospital,Beijing 100029,China)

机构地区：[1]北京大学口腔医院综合科,北京100081 [2]北京化工大学材料科学与工程学院,北京100029 [3]中日友好医院口腔医学中心,北京100029

出　　处：《中国医药导报》2023年第24期117-120,共4页China Medical Herald

基　　金：国家国际科技合作专项项目(2014DFA31520)。

摘　　要：目的研究热成形时间对正畸热压膜材料厚度和弹性模量的影响。方法选用厚度为0.380、0.625、0.760 mm的正畸热压膜材料,将3种不同厚度的热压膜材料按热成形时间不同分为未处理组、热成形60 s组、热成形90 s组,每组不同厚度材料各10个试样。应用电子游标卡尺及万能材料试验机测量三组的厚度和弹性模量,比较不同热成形时间对材料厚度和弹性模量的影响。结果0.380、0.625、0.760 mm热压膜材料中,热成形60 s组、热成形90 s组厚度低于未处理组,且热成形90 s组低于热成形60 s组,差异有统计学意义(P<0.05)。0.380 mm热压膜材料中,热成形60 s组、热成形90 s组弹性模量均高于未处理组,差异有统计学意义(P<0.05)。0.625、0.760 mm热压膜材料不同处理组弹性模量比较,差异无统计学意义(P>0.05)。结论热成形后热压膜材料厚度变薄,热成形时间越长,材料越薄,0.380 mm热压膜材料弹性模量显著增加。在正畸临床工作中,需全面认识材料的性能,根据患者自身情况及矫治需求和难度的不同,选用合适的材料进行治疗。Objective To investigate the effect of thermoforming time on the thickness and elastic modulus of orthodontic thermoplastic materials.Methods Orthodontic thermoplastic materials with thicknesses of 0.380,0.625,and 0.760 mm were selected and divided into untreated group,thermoforming 60 s group,and thermoforming 90 s group according to the thermoforming time,with ten specimens in each group of different materials.The thickness and elastic modulus of the three groups were measured by electronic vernier caliper and universal material testing machine,and the effects of different thermoforming times on the thickness and elastic modulus of the three groups were compared.Results For the thermoplastic materials of 0.380,0.625,and 0.760 mm,the thickness of thermoforming 60 s group and thermoforming 90 s group was lower than that of the untreated group,and the thickness of thermoforming 90 s group was lower than that of thermoforming 60 s group,and the differences were statistically significant(P<0.05).For the 0.380 mm thermoplastic material,the elastic modulus of the thermoforming 60 s group and the thermoforming 90 s group was higher than that of the untreated group,and the difference was statistically significant(P<0.05).There was no significant difference in elastic modulus between different treatment groups of the thermoplastic materials of 0.625 and 0.760 mm(P>0.05).Conclusion The thickness of thermoplastic material becomes thinner after thermoforming.The longer the thermoforming time,the thinner the material,and the elastic modulus of thermoplastic material of 0.380 mm increased significantly.In orthodontic clinical work,it is necessary to fully understand the properties of materials,and select appropriate materials for treatment according to the patients’own conditions and different orthodontic treatment needs and difficulties.

关 键 词：热成形 热压膜材料 厚度 弹性模量 

分 类 号：R783[医药卫生—口腔医学]