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TheFabricationofTheMetalCeramicCrownSection9Impressions:Prpearationrinseanddrythepreparedteethwithoutleavingresidueselectsuitabletrayorfabricateindividualtraymaterialselection:utilizesiliconerubbertogetfinalimpressionPrerequisitesfortheimpression：TheimpressioniscompletewithclearsurfacedetailsandcervicalmarginEnoughcoverageincludingabutmentsandadjacentteethExactlyreflecttheconditionoftheabutmentsModelpouring：Materialspatulation:artificialstone.Theimpressionshouldberinsedanddriedbeforepouring.Pouring：vibratethetraysoastokeepthemodelbubble-free.Detachment：>1hourTrimming：trimthemodelaccordingtotheappearanceofnaturaldenturewiththerequisitionofclearcervicalmarginandcorrectarticulationModelfinishing

DowelpinremovabledieFabracationoftheRemovablediePedestalwithmodelsectionedFabricationofthemetalframeworkFabracationoftheRemovabledieusedie-spacerswaxing：anteriortoothlabial0.3-0.5mm，

lingualcervicalmargin0.5mmcarvethecontourocclusaladjustmentfinishthewaxpatternUsedie-spacerwaxingFabricatethewaxpattern——completelyrecoverthecontour(excepttinystructure）waxing

WaxingSprueingWaxingNoticeofthewaxpatterns：Thickness：thick－easytodistortandcontractthin－fagileContour：smoothwithoutsharpedgesandcornersOcclusalrelationMethodprotectingwaxcontraction：removethewaxpatternaftercompletelycoolingInvestingFabricationofthemetalframeworkRemovethewaxFabricationofthemetalframeworkCastingFabricationofthemetalframeworkCutawaythesprueandfinishthecastingFabricationofthemetalframeworkManagementofthemetalframework

：CoarsegrindingSandblasting：80-100gritquartzpurpose：getridofthehesionandoxideoncasting’ssurfacesoastoformcoarseningsurfaceRinsing：ultrasoniccleanerPreoxidationSandblasting,coarsening,degassingandpreoxiditionFabricationofthemetalframework

Porcelainaddition：MethodtoaddopaqueporcelainThecolorofopaqueporcelain:maskthecolorofbasemetalalloyPorcelainadditionSinteringProcessthecervicalmarginMethodtoaddopaqueporcelain:Addporcelain：>1-1.5mm，incisal2-2.5mm.vibrateandshrinktokeepbubble-freeIncisalporcelainFinishthecontouraccordingtoanatomicalappearanceofcrownandarticulationBlushopaqueporcelainPorcelainaddition：ThebodyporcelainshouldbeoverbuilttocompensateforporcelainshrankagePorcelainaddition：OpaqueporcelaincompletelymaskthecolorofmetalafterfiringPorcelainaddition：Porcelainaddition：ThecutawaybodyporcelainshouldbemadeupforwithenamelporcelainPorcelainaddition：SinteringdentinporcelaininthefirsttimePorcelainaddition：TrimmingPorcelainaddition：Glazing，sinteringthesecondtimePorcelainaddition：Noticeofporcelainadditionandsintering：KeepthebasemetalcopingnoncontaminatingPayattentiontoshrinkagewhenaddporcelaininorderto

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