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1、模拟口腔环境下温控型镰钛弓丝力学性能实验探究[摘要]目的研究温控型银钛弓丝在不同温度人工唾液环境下的力学性能变化,为临床合理、有效地使用温控型银钛弓丝提供参考。方法利用Instron万能材料力学实验机在25、33、37、609人工唾液中对4种温控型镰钛弓丝进行改良部分牙弓托槽弯曲实验。将4种温控型银钛弓丝加载挠曲至3mm后卸载,绘制弓丝卸载的载荷一挠曲曲线,计算卸载至2.5mm与0.5mm之间的卸载刚度,结果采用单因素方差分析法进行统计分析。结果随着温度的升高,4种弓丝的卸载力值均有不同程度的升高;同种弓丝的卸载刚度在25、33、379时十分接近,而在60°C时卸载刚度均有明显增大。结论
2、在本实验条件下,4种温控型牒钛弓丝表现出不同的力学性能,但均表现出临床所需的超弹性与形状记忆效应,也均表现出明显的温度敏感性。[关键词]温控型镇钛弓丝;力学性能;温度;人工唾[中图分类号]R783.5[文献标志码]A[doi]10.3969/j.issn.1000-1182.2012.02.026Mechanicalpropertiesofthermodynamicnickel-titaniumarchwiresinasimulatedoralenvironmentinvitroFanXushengl,LiZhihua2,ShiHui2,LiuXiang2.(1.Dept,ofStoma
3、tology,HangzhouFirstPeople5sHospital,Hang-zhou310006,China;2.Dept,ofOrthodontics,TheAffiliatedStomatologyHospitalofNanchangUniversity,Nanchang330006,China)[Abstract]ObjectiveThisstudywastoinvestigatethemechanicalpropertiesofthermodynamicnickel-titanium(NiTi)archwiresofdifferentbrandsundercontroll
4、edtemperatureandinartificialsalivatoprovidesomereferenceforitsclinicalapplication.MethodsUsingamodifiedpartialdentalarchbendingsystem,fourtypesofthermodynamicNiTiarchwiresweretestedundercontrolledtemperature(25,33,37,60°C)andinartificialsaliva・AnInstronUniversalTestingMachinewasusedtoapply3mmdefl
5、ectionsofarchwiresinthelateralincisorarea・Theload-deflectioncur-vesweredeterminedfromthepassivepositiontodeflectionsof3mm.Thefollowingvariablesfromunloadingcurveswerecalculated:Stiffnessbetween2.5mmUDP(unloadingdeflectionpoint)to0.5mmUDPafterunloading.Anystatis-ticallysignificantdifferencesinthes
6、evariablesforthedifferentbrands,temperatureandmomentslevelswereanalyzedusingone-wayanalysisofvariance・ResultsUnloadingvaluesoffourtypesthermodynamicnickel-titaniumarchwiresincreasedwithcontrolledtemperaturerising.Theunloadingstiffnessofthesamebrandarchwireswereapproximateat25,33,37°C,whiletheirun
7、loadingstiffnessincreasedobviouslyat60°C.ConclusionDifferentbrandsthermodyna-micNiTiarchwiresdemonstrateddifferentmechanicalbehaviours,butallofthemexhibitedsuperelasticityandprac-ticalshapememoryeffect.Thefourthermodyn