氧化锆及四种全冠修复材料磨耗性能的对比研究摘要背景:目前在临床工作中后牙区较常使用的全冠修复材料主要有镍铬合金、钴铬合金、金钯合金、vita陶瓷等修复材料。随着材料学的进步近年来出现了氧化锆这种新兴的口腔修复材料,由于后牙区氧化锆全瓷冠受力后容易崩瓷,目前后牙区多倾向于纯氧化锆全冠修复,因此产生了氧化锆与对颌天然牙体组织之间的磨耗性问题。本实验利用体外实验机,将纯氧化锆与上述四种临床常用的全冠修复材料的磨耗性能做一对比,旨在观察氧化锆与这四种全冠修复材料的磨耗差异。目的:观察氧化锆与其他四种临床常用的全冠修复材料的硬度及与滑石瓷对磨时对其造成的体积损失量并与天然牙比较,研究氧化锆及另外四种修复材料的磨耗差异。方法:使用MMw—l立式万能摩擦磨损实验机,试验组氧化锆、vita陶瓷、金钯合金、镍铬合金、钴铬合金及对照组天然牙釉质为上试件,并分别安装于磨耗机的上部夹具中;滑石瓷为下试件,分别安装于实验机的下部夹具中。在人工唾液环境下进行加载磨耗实验,然后分别计算出上下试件的体积损失量;使用纤维硬度测试仪对上述试件进行硬度测试;扫描电镜下观察磨耗形态。结果:氧化锆硬度值最高,自身及造成对磨滑石瓷体积损失量均大于天然牙,金钯合金硬度值最小,自身及对磨滑石瓷体积损失量最接近天然牙(P<0.05)磨耗性能与天然牙最接近,其磨耗性能比另外四种全冠修复材料更优越;两组陶瓷试件的硬度与对磨滑石瓷体积损失量呈显著正相关(r=0.893、0.925、P<O.05),三组金属试件的硬度与其导致的对磨滑石瓷体积损失量间呈显著正相关性(r=0.897、0.922、0.976,P<O.05);试验组五种材料所导致的滑石瓷体积损失量均大于对照组天然牙所导致的滑石瓷体积损失量,两两比较具有显著的统计学差异(P<0.05)扫描电镜下观察氧化锆及vita陶瓷两组陶瓷试件磨耗面主要为磨粒磨损,表面沟裂突起样结构明显、磨耗犁沟深、形态不规则,磨耗面可见散在气孔结构。三组金属材料中钴铬合金磨耗面相对光滑,表面磨耗犁沟较浅,磨耗面散在金属磨粒;镍铬合金磨耗犁沟深而宽,磨耗面存在大量金属磨粒;金钯合金磨耗犁沟均匀分布,偶见剥脱斑块,斑块内金属磨粒附着。[IfJFIflFfllflIFIJIFflfJIIfllf[Xll[I』Y2338785}IJ结论:1.氧化锆所造成的对磨滑石瓷损失量最大,提示在临床中容易造成对颌天然牙的过度磨耗,永久粘固前应对其进行精细抛光以降低对天然牙的磨耗。2.金钯合金所造成的对磨物损失量与天然牙最近接、磨耗性能最优,是较好的后牙区全冠修复材料。3。口腔修复材料的硬度值不能代表其磨耗性能大小,应综合考虑材料表面的微观结构等因素,采取措施发挥各种材料自身优势。硕士研究生:王军(口腔医学)指导教师:王万春主任医师【关键词】:氧化锆;牙釉质;磨耗;硬度;耐磨性Wearingabilityofzirconiaandfourkindsoffullcrownrepairmaterials:ComparativestudyAbstractobjective:Anteriorrestorationregionaremorecommonlynickel—chromiumrestorativeusedinalloys,clinicalworkfullcrownalloy,materialscobalt—chromiumgold—palladiumalloyvimceramicmaterialsscience,inzirconiarecentmaterials.Withtheadvancesinyearsthisemergingprosthodonticsmaterialzirconia,all-ceramiccrownsposteriorareaeasytocollapseporcelainforce,currentlymoreinclinedtotheposteriorregionofpurezirconiacrowns,resultinginazirconiajawnaturaltooths仃ucturebetweenthewearproblem.Inthisstudy,usinginvitroexperiments,thewearperformanceofpurezirconiumoxideandthefourcommonlyusedinclinicalcrownsmaterialsmakeacomparison、析mthefourcrownsaimedtoinvestigatethezirconiarestorativematerialsweal"difference.Methods:Thezirconiaceramic,vimceramics,gold-palladiumalloyalloy,nickel—chromiumcontrolgroupwerealloy,cobalt?chromiumandfreshnaturalenamelintheinstalledintheupperfixtureofwearmachinerespectively,andthesteatiteporcelainwasinstalledinthelowerfixture.Loadabrasiontestswereperformedinartificialsalivaenvironment,andthenthevolumelossofthematerialsintheupperandlowerfixtureWascalculated;thehardnessofthematerialsaboveWastestedwithfiberhardnesstestingmachine;thespecimensurfaceabrasionmorphologywasobservedunderscanningelectronmicroscope.Result:TheZirconiavolumelossofthefivematerialswhengrinding、Ⅳimsteatitewaslargerthanthatofthefreshnaturalenamelinthecontrolgroup(P<0.05);thehardnessofceramicsWaShighest,andthevolumelossofZirconiaceramicswhengrindingwithsteatitewaslargest.Thegold-palladiumalloyhadthesmallesthardness,andthetovolumelossofgold-palladiumalloywhengrindingwimsteatiteWassimilarthatofthenaturalteeth;thehardnessofallthematerialsWaspositivelycorrelatedthe谢tllandvolumelossofgrindingsteatiteporcelain(P<0.05).111ezirconiaceramicvitaceramicweremainlyperformedasabrasivewear,andthesurfacewasinfissureprotruding—likestmcturewitlldeepabrasionfurrowsandirregularthescatteredpores仃ucturemorphology,couldbeseenontheabrasionsurface.nleabrasionsmooth、析tllshallowabrasionseenonsurfaceofcobalt—chromiumalloyWasrelativelyfurrows,andthescatteredmetalabrasiveparticlescouldbesurface;deepand、析deabrasionparticlescouldbeseenontheabrasionfurrowsandalargeamountofmetalabrasivetheabrasionsurfaceofonfurrowswasevenlydistributedtheexfoliativeplaquecouldtheabrasionnickel—chromiumalloy;abrasionsurfaceofgold-palladiumalloy,andbeseenoccasionally、杭tllmetalabrasiveparticlesinit.111eresultsindicatethatzireoniaceramiciS1ikelytocauseexcessiveabrasiononthejawnaturaltooth.inclinicalapplication,SOpolishingshouldbeperformedbeforepermanentcements;thegold—palladiumalloyhasthebestwearingabilitywhichisclosetothatofthenaturalteeth,anditiSconsideredthebetterposteriorregionfullcrownrepairmaterial;thehardnessofthedentalprostheticmaterialcarlnotrepresentthewearingability,themicrostructureofthematerialsurfaceandotherfactorsshouldbeconsideredwhenusinginordertoplaytheadvantagesofvariousmaterials.Postgraduatestudent:JunDirectedbyWangProfessor:Wan—ChunWangKeyWords:Zirconia;enamel;wearing;hardness;wearresistance目录弓I言………………………………………………………………………………………………………………………….1第一章实验材料与方法…………………………………………………………..21实验材料设备及分组方法:……………………………………………………………21.1实验材料:…………………………………………………………………………21.2材料分组及纳入标准:………………………………………………………….22实验设计……………………………………………………………………………………33实验方法……………………………………………………………………………………33.1试件制备……………………………………………………………………………..33.2磨耗实验:………………………………………………………………………….33.3测量密度及数据:……………………………………………………………………43.4硬度测试:…………………………………………………………………………43.5扫描电镜观察:………………………………………………………………………53.6主要观察指标:…………………………………………………………………….53.7统计学分析:………………………………………………………………………..5第二章结果………………………………………………………………………61磨耗数据分析:…………………………………………………………………………….62试件表面硬度值与对磨滑石瓷磨耗量的关系分析…………………………………73试件表面磨耗形态观察与磨耗分析:……………………………………………….83.1氧化锆组:…………………………………………………………………………..83.2vita陶瓷组……………………………………………………………………………93.3钴铬合金组:……………………………………………………………………….103.4镍铬合金组:………………………………………………………………………..113.5金钯合金组:……………………………………………………………………….123.6磨损形态与磨耗性能关系分析:………………………………………………..12第三章讨论………………………………………………………………………………。141实验类型设计依据及对磨物选择:………………………………………………….142氧化锆与陶瓷材料磨耗性能对比分析:…………………………………………………………..1ZI3氧化锆与金属材料磨耗性能对比分析:…………………………………………………………..11;
氧化锆及四种全冠修复材料磨耗性能的对比研究 - 图文
2020-02-21 22:12
氧化锆及四种全冠修复材料磨耗性能的对比研究 - 图文.doc
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