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正畸资料的生物机械原理Law1Inorthodontics,toothmovesthroughboneandbringstheperiodontalligamentwithit.ThebasisofthePeriodontalLigament(PDL)CellsofPDLFibersofthePDL6GroundsubstanceofthePDLAlveolarBoneC:CellF:FiberAB:AlveolarboneG:GingivityCE:Law2Toothcannotmoveunlessboneappositionandresorptiontakeplace.SusanM.OttUnivofWashingtonLaw3Therewillbenotoothmovementunlessthereisaforce.ThebasisofForceForceTypesForceMagnitude(Level)ForceDurationLaw4Orthodontictoothmovementisnottheonlytypeoftoothmovement.EruptionActivePassiveLateraldriftsPhysiologicalDuetolossofadjacentteethOrthodontictoothmovementTypesofToothMovement202122MechanismsofToothMovement24MechanismsofToothMovement26272829TheOptimalForce31Law5Orthodontictoothmovementcannotoccurunlesscellsareatwork.Force---fluidflow---cell-levelstrainDeformationofcellmembraneleadingtocytoskeletalchangesSecondmessengerpathwaysGeneupregulationinfibroblasts,osteoblastsandosteoclastsEffectofthelightforceonthePDL“Frontalresorption”becauseitoccursbetweentherootandthelaminadura.LightforceleadingtofrontalresorptionEffectsofheavyforceonthePDL“Underminingresorption”becauseitoccursontheundersideoflaminadura,notbetweenlaminaduraandtheroot.Law6FrontalresorptionoccursinthePDL,whereasunderminingresorptionoccursunderneaththelaminadura.HeavyforceleadingtounderminingresorptionPhase1Law7Frontalresorptionfacilitatesorthodontictoothmovement,whereasunderminingresorptionimpedesorthodontictoothmovement.AnchorageAnchoragetypesReciprocalanchorageBiomechanicsofToothMovement48ForceandCouple50PotentialComplicationsofOrthodonticToothmovementOrthodonticeffectsonthepulpRootresorption54GeneralizedRootResorptionLocalizedRootResorption57Law8Orthodontictoothmovementremainsoneofthemostsuccessfulprocedureswithpredictableoutcomeinmedicineanddentistry.Orthodonticsanddentofacialorthopedicsrequiresthoroughknowledgeinbiology(ofbone,cartilage,teeth,muscles,nervesandothersofttissues),biomechanics,biometrics,materialscience,clinicalskillsandpracticemanagementinadditiontointerp
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