人牙釉质的酸蚀特性研究

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1、西南交通大学硕士学位论文人牙釉质的酸蚀特性研究姓名：肖枫申请学位级别：硕士专业：材料科学与工程指导教师：郑靖20081201西南交通大学硕士研究生学位论文第1I页内层牙釉质最差。关键词：人牙釉质；柠檬酸；酸蚀：摩擦磨损；纳米划痕西南交通大学硕士研究生学位论文Abstract第1II页Withtheincreasedconsumptionofsoftdrinksandlifeexpectancy,exposureofteethtoanacidenvironmentisbecomingcommonplace，anderosionha

2、sgraduallybecomeamaincausefortoothwearnowadays．Understandingtheerosionbehaviorandmechanismofhumantoothcnamelinacidsolutionwouldhelptheclinicaltreatmentoftoothwearandaidintheoptimizationofeatinghabits．Inthispaper，theerosionprocessandmechanismofhumantoothenamelinwerein

3、vestigatedinvitrousingcitricacid(pH=3．2)．TheerodedsurfacesofenamelafterdifferenterosiontimeswereanalyzedbymeansofVickersmicrohardnesstester,profilometry,SEMandEDX．Andthemicro—tribologicalbehaviorsoftheacid—erodedenamelsubjectedtodifferenterosiontimeswereexaminedusing

4、anano—scratchtester．Inaddition，theerosion·resistancesofouter／medial／innerenamelhavealsobeencompared．Mainconclusionscanbesummarizedasfollows：1．Noobviouserosivelesionoccurredonthesurfaceofenamelafter1minerosion．Thereappearedappreciableerosivesubstancelossonthesurfaceof

5、enamelafter3minerosion，accompanyingbythedecreaseinthesurfacemicrohardness．Theerosivelesionofenamelaggravatedwiththeerosiontime．Theerosiondepthincreasedto3．487／zmafter30min．TheerosionofenamelrodswaseasiertOoccurthanthatoftheinter．enamelintheearlystageoferosion．2．Theer

6、osionofenamelhadsignificantinfluenceonitsfrictionandwearbehaviors，andtheinfluencedependedstronglyontheerosiontime．Attheearlystageofacid·attack，thefrictioncoefficientincreasedwitherosiontimeaccompaniedwithincreasinglystrongfluctuationsandboththedepthandwidth西南交通大学硕士研究

7、生学位论文第1V页ofthescratchesincreased．However,thefrictioncoefficientandwearlossincreasedslowlyatthelatestage．3．Theerosion—resistanceofhumantoothenamelchangedwiththelocationonitsaxialcross—section．Fromtheoutertotheinnerlayerofhumantoothenamel，thesurfacemicrohardnessdecreas

8、ed，whiletheerosiondepthincreased．Furthermore，thewear-resistanceoftheinnerenameldecreasedmoresignificantlyafter3minerosionthanthatof