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ThephenomenonofbonedehiscencesDefinition

anteriortoothmovementexceedsbonyappositioncanleadtoresorptionofthecorticalboneandexposureoftherootHigh-riskpopulation

mandible&maxillaprotrusionexpansionofthemaxillaryarch

'''Example1Locationofbone-thicknessmeasurementsbeforeandafterretraction'''S1'''S2'''S3'''Example2

rotatedcaninesandcrowdingoftheincisorsarefoundinthepretherapeuticmandibularsituation'''correspondingpretreatmentCTexamination：3D-reconstruction

narrowfrontalmandibularalveolarprocesswiththinfacialboneplates'''Clinicalsituationaftertwoyearsoforthodontictreatment'''CorrespondingCTexamination：3D-reconstruction

extensivefacialdehiscencesabovetherootsoftheincisorsandcanines'''DentalanatomyAlveolarboneproperSupportingalveolarbone

CorticalplateSpongybone'''bonetracestoothmovement?Abasicaxiominorthodonticsiswheneverorthodontictoothmovementoccurs,bonearoundthealveolarsocketwillremodeltothesameextent'''Thetruthis…Intheverticaldimension:

duringorthodontictoothextrusion,boneincreaseisusuallylessthanthedentaldisplacement,leadingtoanincreaseintheclinicalcrown.Inthetransversedimension:

boneremodeling/toothmovementratiooftoothretractionwithtipandwithtorqueis1:2and1:2.35respectively'''Repairoftheperforationsite

bonedehiscenceswerepartlyrepairedintheretentionperiod,butitwasinsufficienttocovertherootcompletelyRepairoftheperforationsitewillleadtorelapseoftheteeth'''conclusionretractionoftheincisorsislimitedforcingthetoothagainstthecorticalbonemaycauseadversesequelaesurgicalorthodontictreatmentshouldbetakedwhentoothmovementexceed“bonewall”'''anteriormaxillarysubapicalosteotomyinitialexamination'''beforesurgery：maxillaryfirstpremolarsandleftmandibularcentralincisorwereextracted.Allresidualthirdmolarswerealsoextracted'''aftersurgery：anteriormaxillarydentoalveolarsegmentrepositioned4mmposteriorlyand3.5mmupward.'''after2yearsofretention：'''referenceAlexanderD.Vardimon,EyalOren.Corticalboneremodeling/toothmovementratioduringmaxillaryincisorretractionwithtipversustorquemovements.AmericanJournalofOrthodonticsandDentofacialOrthopedics,Volume114,Number5Simten

Sarikaya,Bulent

Haydar.Changesinalveolarbonethicknessduetoretractionofanteriorteeth.AmericanJournalofOrthodonticsandDentofacialOrthopedics.July2002HeinrichWehrbein,Priv

DozDrmed.Humanhistologictissueresponseafterlong-termorthodontictoothmovement.AmericanJournalofOrthodonticsandDentofacialOrthopedics,Volume107,No.4Javad

Hazrati

Marangalou,Farzan

Ghalichi.Numericalsimulationoforthodonticboneremodeling.orthodonticwaves.(2009):64-71ManabuMiyamoto,TakashiYam

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