Developmental Defects Flashcards
Hypodontia
Missing teeth bc fail to develop Anodontia = All and Oligodontia = >6 50% pts w/ missing primary teeth have missing permanent teeth Associated with Down Syndrome
Supernumerary Teeth
Extra teeth - anterior maxilla is most common
Mesiodens = in midline
Supplemental = look like normal teeth
Conical supernumeraries = if inverted they may migrate superiorly towards nose!
tuberculate supernumeraries = may impede eruption of adjacent teeth
Microdontia
Teeth too small includes peg teeth
Lateral incisors most affected
Macrodontia
Teeth too large Includes Double teeth - fusion and gemination Dens in dente Talon cusp - may have its own pulp do not 'shave down'!
Amelogenesis Imperfecta
Defects in the function of ameloblasts and mineralisation of the enamel matrix.
X-linked
Hypoplastic type
Hypomineralised type
Hypoplastic amelogenesis imperfecta
THIN but HARD and patchy enamel, normal bond strength
Plastic = hard
Hypomineralised amelogenesis imperfecta
THICK but SOFT enamel; and impaired bond strength
Dentinogenesis Imperfecta
Type I = associated with osteogenesis imperfecta
Type II = Just DI
Type III = brandywine - very severe
Spontaneous abscesses and pulp obliteration
MIH
Molar Incisor Hypomineralisation
Permanent 1s and 6s
Creamy white - yellow/brown enamel opacities
Caused by disruption of maturation/late transitional stage of amelogenesis
Fluorosis
caused by ingestion of high fluoride during amelogenesis
Affects teeth that were being formed during high F injestion
Turner’s tooth
Hypoplastic defect of permanent premolars - caused by infection or trauma to preceding deciduous tooth
Taurodnotism
Enlarged pulp - furcation is moved apically
Dilacerated tooth
abnormal bend in root or crown
Metabolic disturbances
Anaemia/splenectomy
Green/black/yellow teeth - bands
