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