ThephenomenonofbonedehiscencesDefinition

anteriortoothmovementexceedsbonyappositioncanleadtoresorptionofthecorticalboneandexposureoftherootHigh-riskpopulation

mandible&maxillaprotrusionexpansionofthemaxillaryarch

Thephenomenonofbonedehisce1Example1Locationofbone-thicknessmeasurementsbeforeandafterretractionExample1Locationofbone-thic2S1S13S2S24S3S35Example2

rotatedcaninesandcrowdingoftheincisorsarefoundinthepretherapeuticmandibularsituationExample26correspondingpretreatmentCTexamination：3D-reconstruction

narrowfrontalmandibularalveolarprocesswiththinfacialboneplatescorrespondingpretreatmentCT7ClinicalsituationaftertwoyearsoforthodontictreatmentClinicalsituationaftertwoy8CorrespondingCTexamination：3D-reconstruction

extensivefacialdehiscencesabovetherootsoftheincisorsandcaninesCorrespondingCTexamination：9DentalanatomyAlveolarboneproperSupportingalveolarbone

CorticalplateSpongyboneDentalanatomyAlveolarbonepr10bonetracestoothmovement?Abasicaxiominorthodonticsiswheneverorthodontictoothmovementoccurs,bonearoundthealveolarsocketwillremodeltothesameextentbonetracestoothmovement?11Thetruthis…Intheverticaldimension:

duringorthodontictoothextrusion,boneincreaseisusuallylessthanthedentaldisplacement,leadingtoanincreaseintheclinicalcrown.Inthetransversedimension:

boneremodeling/toothmovementratiooftoothretractionwithtipandwithtorqueis1:2and1:2.35respectivelyThetruthis…Intheverticald12Repairoftheperforationsite

bonedehiscenceswerepartlyrepairedintheretentionperiod,butitwasinsufficienttocovertherootcompletelyRepairoftheperforationsitewillleadtorelapseoftheteethRepairoftheperforationsite13conclusionretractionoftheincisorsislimitedforcingthetoothagainstthecorticalbonemaycauseadversesequelaesurgicalorthodontictreatmentshouldbetakedwhentoothmovementexceed“bonewall”conclusionretractionofthein14anteriormaxillarysubapicalosteotomyinitialexaminationanteriormaxillarysubapicalo15beforesurgery：maxillaryfirstpremolarsandleftmandibularcentralincisorwereextracted.Allresidualthirdmolarswerealsoextractedbeforesurgery：maxillaryfirst16aftersurgery：anteriormaxillarydentoalveolarsegmentrepositioned4mmposteriorlyand3.5mmupward.aftersurgery：anteriormaxilla17after2yearsofretention：after2yearsofretention：18referenceAlexanderD.Vardimon,EyalOren.Corticalboneremodeling/toothmovementratioduringmaxillaryincisorretractionwithtipversustorquemovements.AmericanJournalofOrthodonticsandDentofacialOrthopedics,Volume114,Number5SimtenSarikaya,BulentHaydar.Changesinalveolarbonethicknessduetoretractionofanteriorteeth.AmericanJournalofOrthodonticsandDentofacialOrthopedics.July2002HeinrichWehrbein,PrivDozDrmed.Humanhistologictissueresponseafterlong-termorthodontictoothmovement.AmericanJournalofOrthodonticsandDentofacialOrthopedics,Volume107,No.4JavadHazratiMarangalou,FarzanGhalichi.Numericalsimulationoforthodonticboneremodeling.orthodonticwaves.(2009):64-71ManabuMiyamoto,TakashiYamashiro.Surgicalorthodontictreatmentforseveremaxillaryprotrusionwithaggressiveperiodontitis.orthodonticwaves.(2008):171-178referenceAlexanderD.Vardimon19Thankyou!Thankyou!20ThephenomenonofbonedehiscencesDefinition

anteriortoothmovementexceedsbonyappositioncanleadtoresorptionofthecorticalboneandexposureoftherootHigh-riskpopulation

mandible&maxillaprotrusionexpansionofthemaxillaryarch

Thephenomenonofbonedehisce21Example1Locationofbone-thicknessmeasurementsbeforeandafterretractionExample1Locationofbone-thic22S1S123S2S224S3S325Example2

rotatedcaninesandcrowdingoftheincisorsarefoundinthepretherapeuticmandibularsituationExample226correspondingpretreatmentCTexamination：3D-reconstruction

narrowfrontalmandibularalveolarprocesswiththinfacialboneplatescorrespondingpretreatmentCT27ClinicalsituationaftertwoyearsoforthodontictreatmentClinicalsituationaftertwoy28CorrespondingCTexamination：3D-reconstruction

extensivefacialdehiscencesabovetherootsoftheincisorsandcaninesCorrespondingCTexamination：29DentalanatomyAlveolarboneproperSupportingalveolarbone

CorticalplateSpongyboneDentalanatomyAlveolarbonepr30bonetracestoothmovement?Abasicaxiominorthodonticsiswheneverorthodontictoothmovementoccurs,bonearoundthealveolarsocketwillremodeltothesameextentbonetracestoothmovement?31Thetruthis…Intheverticaldimension:

duringorthodontictoothextrusion,boneincreaseisusuallylessthanthedentaldisplacement,leadingtoanincreaseintheclinicalcrown.Inthetransversedimension:

boneremodeling/toothmovementratiooftoothretractionwithtipandwithtorqueis1:2and1:2.35respectivelyThetruthis…Intheverticald32Repairoftheperforationsite

bonedehiscenceswerepartlyrepairedintheretentionperiod,butitwasinsufficienttocovertherootcompletelyRepairoftheperforationsitewillleadtorelapseoftheteethRepairoftheperforationsite33conclusionretractionoftheincisorsislimitedforcingthetoothagainstthecorticalbonemaycauseadversesequelaesurgicalorthodontictreatmentshouldbetakedwhentoothmovementexceed“bonewall”conclusionretractionofthein34anteriormaxillarysubapicalosteotomyinitialexaminationanteriormaxillarysubapicalo35beforesurgery：maxillaryfirstpremolarsandleftmandibularcentralincisorwereextracted.Allresidualthirdmolarswerealsoextractedbeforesurgery：maxillaryfirst36aftersurgery：anteriormaxillarydentoalveolarsegmentrepositioned4mmposteriorlyand3.5mmupward.aftersurgery：anteriormaxilla37after2yearsofretention：after2yearsofretention：38referenceAlexanderD.Vardimon,EyalOren.Corticalboneremodeling/toothmovementratioduringmaxillaryincisorretractionwithtipversustorquemovements.AmericanJournalofOrthodonticsandDentofacialOrthopedics,Volume114,Nu