课件口腔修复桩核冠.pptx

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PostCrownandPost-CoreCrownZhuziyuanStaffRoomofProsthodontics

Postcrown(DowelCrown)Post-corecrown(Dowel-coreCrown,Postandcoresystem)

What’sthepostcrownandpost-corecrown?What’sthedifferencebetweenthepostcrownandpost-corecrown?Whendopeopleneedone?Whatinfluencetheretentionandstrength?What’sthepointoftoothpreparing?Howtofabricateit?Emphases

Definitionofpostcrown是利用冠桩插入根管内以获得固位的一种冠修复体。

Definitionofpostcrown

advantagesofpost-corecrownchangecrownwithoutchangepost

advantageofpost-corecrownchangedirectionofthetoothrestoretheextensivetoothdefectwithfullcrown

WhenistherighttimePerfectRCT(rootcanaltherapy根管治疗)

Whenistherighttime1~2weeksafterRCTcompletedFistulacicatrized

WhenistherighttimeLesionaroundapexlimited

Indicationsofpost-corecrownExtensivelydamagedtoothThedefectisinsubgingivalarea

Anteriortoothfracture(trauma)

Malposition(错位)ortorsiversion(torsoclusion扭转)Indicationsofpost-corecrown

malformed(畸形)toothIndicationsofpost-corecrown

AsaretainerforFPD(Fixedpartialdenture固定义齿)

Contraindicationofpost-corecrownAgeunder18InflammationwithclinicalsymptomSevereboneabsorption(1/3ofroot)

therootcanaliscurvedandtinyContraindicationofpost-corecrown

AlateralcleftinrootcannelContraindicationofpost-corecrown

AnobliquefractureunderalveolarcrestContraindicationofpost-corecrown

Thebrokenpostcannotbetakenout.Deepbite,compactocclusion.Contraindicationofpost-corecrown

Retentionandstrengthlength:2/3--3/4lengthoftheroot≥4mmapicalsealremainedLengthofthepost≥lengthofthecrown

Lengthofthepostinsidealveolar1/2lengthoftherootinsidealveolarRetentionandstrength

diameter:1/3oftheroot’sdiameterRetentionandstrength

shapecrosssectionshapeRetentionandstrength

externalshapeparallelpostcone-shapedposttrapeziformpostRetentionandstrength

Retentio

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