错牙合畸形的病因专家讲座.pptx

Etiology of malocclusionFengshan ChenTongji university错牙合畸形的病因第1页Systems of ClassificationInherited(predetermined)(genetic)Acquired(environmental)错牙合畸形的病因第2页Systems of Classification1)McCoy and Shepard(1956)a)Direct(determining)b)Indirected(predisposing)2)Moyers(1972)a)Heredity b)Developmetal Defects c)Trauma d)Physical agents e)Habits f)Diseases g)malnutrition 错牙合畸形的病因第3页Classification3.Salzman a)Prenatal b)Postnatal4.Graber a)General(extrinsic)factors b)Local(intrinsic)factors错牙合畸形的病因第4页Graber General factorsHeredityCongenital defectsEnvironmentPredisposing metabolic climate&diseaseDietAbnormal pressure habitsPostureTrauma错牙合畸形的病因第5页HeredityTwo Facts1.For each individual there is a basic pattern or blueprint for dentofacial development not really which may be masked but not really changed.(unless by surgery).2.Racial and familial characteristics repeat 错牙合畸形的病因第6页Facial TypingBrachycephalic-short,broadDolicocephalic-narrow,tapering,longMesocephalic-round,oval错牙合畸形的病因第7页Facial Typing-profileConvex-Class Two(protrusive maxilla or retrusive mandible)or Class 1 bimaxillaryConcave-Class Three(protrusive mandible or retrusive maxilla)Flat-Class One(denture bases in harmony)错牙合畸形的病因第8页Affected by HeredityTooth sizeArch length and widthHeight of the palatal vaultCrowding or spacingOverbite and overjetPosition and configuration of musclesTongue size and shapeCharacter of the oral mucosa错牙合畸形的病因第9页Heredity also plays a role in:Congenital deformitiesFacial asymmetrySize and position of the jawsOligodontia and anodontiaSupernumerary teethVariations in tooth shape错牙合畸形的病因第10页Examples of Congenital DefectsClefts of the lip and palateCerebral PalsyCrouzons syndromeCleido-Cranial DysostosisCranial Synostosis错牙合畸形的病因第11页Crouzons Syndrome错牙合畸形的病因第12页Surgery to reopen cranial sutures错牙合畸形的病因第13页Results of Surgery&Orthodontics错牙合畸形的病因第14页Results of Surgery&Orthodontics错牙合畸形的病因第15页Results of Surgery&Orthodontics错牙合畸形的病因第16页Environmental FactorsPrenatal trauma maternal diet maternal metabolism&diseases fetal posture maternal consumption of alcohol&drugs错牙合畸形的病因第17页Environmental FactorsPostnatal Birth injuries TMJ injuries Accidents,fractures Avulsion or displacement of teeth 错牙合畸形的病因第18页Metabolic Factors&DiseasesAcute febrile disease-e.g.measles,mumpes,chicken-pox,etc.Diseases of muscle dysfunction-e.g.muscular dystrophy,cerebral palsy,polio.Endocrine disorders-e.g.pituitary,thyroid,parathyroid.错牙合畸形的病因第19页DietPoor diet may cause deficiency diseases such as richetts,beri scurvy etc.These may cause severe malocclusion due to interference with craniofacial growth and development in addition Periodontal problems associated with significant bone loss错牙合畸形的病因第20页PostureNot an important factorMay be a contributing factorSeldom considered a primary cause错牙合畸形的病因第21页HabitsThumb or finger suckingForeign objectsTongue thrustingLip or cheek bitingMentalis muscle strain错牙合畸形的病因第22页Thumb Sucking错牙合畸形的病因第23页 Treatment Phase 1 错牙合畸形的病因第24页progress错牙合畸形的病因第25页Treatment Phase 2错牙合畸形的病因第26页Post Treatment错牙合畸形的病因第27页Tongue Thrusting错牙合畸形的病因第28页Treatment错牙合畸形的病因第29页progress错牙合畸形的病因第30页Hyperactive mentalis muscle错牙合畸形的病因第31页Local factorsCongential absence of teethAnomalies of tooth sizeAnomalies of tooth shapeAbnormal labiel frenumPremature loss of deciduos teethSupernumerary teeth 错牙合畸形的病因第32页Local FactorsAbnormal resorption of deciduous teethDelayed eruption of permanent teethAbnormal eruptive pathAnkylosis of deciduous teethProximal cariesImproperly contoured restorations错牙合畸形的病因第33页Congenital absense of teeth错牙合畸形的病因第34页Missing and peg-shaped lateral错牙合畸形的病因第35页Space adjusted错牙合畸形的病因第36页Retention错牙合畸形的病因第37页Temporary Restorations错牙合畸形的病因第38页Congenitally Missing Laterals错牙合畸形的病因第39页Spaces Opened错牙合畸形的病因第40页Temporary Restorations错牙合畸形的病因第41页Mandibular retrusion错牙合畸形的病因第42页Mandibular Prognathism and facial asymmetry错牙合畸形的病因第43页Mandibular Prognathism&facial asymmetry错牙合畸形的病因第44页Bilateral Clefts错牙合畸形的病因第45页Expansion错牙合畸形的病因第46页Pre-grafting错牙合畸形的病因第47页Ideopathic Root Resorption错牙合畸形的病因第48页Dilantin Hyperplasia错牙合畸形的病因第49页Tooth Size 错牙合畸形的病因第50页Over Retained Primary Canine错牙合畸形的病因第51页Ectopic Eruption错牙合畸形的病因第52页Anklosed primary molar错牙合畸形的病因第53页Ectopic Eruption错牙合畸形的病因第54页Premature loss of Primary Molar and impacted premolar错牙合畸形的病因第55页Congenital Absense of Maxillary Premolars错牙合畸形的病因第56页Congenital Absence of Lateral Incisors错牙合畸形的病因第57页Congenital Absence of Lateral Incisors错牙合畸形的病因第58页Composite Odontoma causing Impaction of Central Incisor错牙合畸形的病因第59页Composite Odontoma错牙合畸形的病因第60页Supernumerary Teeth错牙合畸形的病因第61页Supernumerary Tooth错牙合畸形的病因第62页提问与解答互动时间提问与解答互动时间错牙合畸形的病因第63页