Saturday, August 27, 2011

Dental Anomalies at Different Stages of Tooth Development


 1.     Dental Lamina formation stage
  • Migration of ectoderm
    1. If it doesn’t migrate… anodontia (no teeth)









2.     Initiation and Proliferation
  • Formation of tooth bud
    1. Partial anodontia, supernumerary, geminated/fused teeth
supernumerary teeth

Fusion

Germination

  • Cleidocranial Dysplasia… an inherited disorder involving the cranium, face, clavicles and supernumerary teeth
                                           
                                                              Cleidocranial Dysplasia
  • Ectodermal Dysplasia… lack of hair, sweat glands (hypohydrotic) and teeth (partial anodontia)
Ectodermal Dysplasia
 3.     Histodifferentiation
  • Odontodysplasia… ghost teeth
                                       
    1. A marked decrease in radiodensity
    2. Very thin enamel and dentin, large pulp chamber
    3. Cells don’t change fully
 4.     Morphodifferentiation
  • Macro/micro size, dans invaginitis, dens evaginatus, Hutchinson’s Incisors, talon cusp, taurodontism, delaceration
                           taurodontism
                                                                      
                           dens evaginatus

                           macrodontia

                           microdontia


       
     5.     Apposition – matrix formation
    • Amelogenesis imperfecta
    • Dentinogenesis imperfecta
    • Enamel Hypoplasia
                      Amelogenesis imperfecta 







      Dentinogenesis imperfecta


      6.     Calcification – mineralization of the matrix
      • Fluorosis
      • Amelogenesis Imperfecta


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