正畸治疗时牙齿移动引起的骨开裂

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1、ThephenomenonofbonedehiscencesDefinitionanteriortoothmovementexceedsbonyappositioncanleadtoresorptionofthecorticalboneandexposureoftherootHigh-riskpopulationmandible&maxillaprotrusionexpansionofthemaxillaryarchExample1Locationofbone-thicknessmeasurementsbeforeandafterretractionS1S2S3Example2r

2、otatedcaninesandcrowdingoftheincisorsarefoundinthepretherapeuticmandibularsituationcorrespondingpretreatmentCTexamination：3D-reconstructionnarrowfrontalmandibularalveolarprocesswiththinfacialboneplatesClinicalsituationaftertwoyearsoforthodontictreatmentCorrespondingCTexamination：3D-reconstruc

3、tionextensivefacialdehiscencesabovetherootsoftheincisorsandcaninesDentalanatomyAlveolarboneproperSupportingalveolarboneCorticalplateSpongybonebonetracestoothmovement?Abasicaxiominorthodonticsiswheneverorthodontictoothmovementoccurs,bonearoundthealveolarsocketwillremodeltothesameextentThetruth

4、is…Intheverticaldimension:duringorthodontictoothextrusion,boneincreaseisusuallylessthanthedentaldisplacement,leadingtoanincreaseintheclinicalcrown.Inthetransversedimension:boneremodeling/toothmovementratiooftoothretractionwithtipandwithtorqueis1:2and1:2.35respectivelyRepairoftheperforationsit

5、ebonedehiscenceswerepartlyrepairedintheretentionperiod,butitwasinsufficienttocovertherootcompletelyRepairoftheperforationsitewillleadtorelapseoftheteethconclusionretractionoftheincisorsislimitedforcingthetoothagainstthecorticalbonemaycauseadversesequelaesurgicalorthodontictreatmentshouldbetak

6、edwhentoothmovementexceed“bonewall”anteriormaxillarysubapicalosteotomyinitialexaminationbeforesurgery：maxillaryfirstpremolarsandleftmandibularcentralincisorwereextracted.Allresidualthirdmolarswerealsoextractedaftersurgery：anteriormaxillarydentoalveolarsegmentrepositioned4mmposteriorlyand3.5mm

7、upward.after2yearsofretention：referenceAlexanderD.Vardimon,EyalOren.Corticalboneremodeling/toothmovementratioduringmaxillaryincisorretractionwithtipversustorquemovements.AmericanJournalofOrthodonticsandDentofacialOrthopedics,Volume114,Number5