Developmental Disturbances(I)
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Developmental Disturbances(I)

Developmental Disturbances

Oral Pathology And Medicine

[Shafer 7th ed 40, 41/ 6th ed 40]

Gemination
  • An attempt at division of a single tooth before calcification, resulting in incomplete formation of two teeth.(AIIMS-2012)
  • The resultant structures will have two completely or incompletely separated crowns with a single root and root canal.
  • It is difficult to differentiate between gemination and a case in which there has been fusion between a normal tooth and a supernumerary tooth.
  • Example: - (Click Here)


Twinning
  • The division of a single tooth resulting in one normal and and one supernumerary tooth. The number of teeth will be more than normal
  • Example: - (Click Here)

 

Concrescence
  • A form of fusion of cementum after completion of root formation
  • The teeth are united by cementum only.
  • Maxillary molars are frequently involved.
  • Example: - (Click Here)

Fusion
  • Union of two normally separated tooth germs.
  • If the union occurs before calcification, the two teeth are completely united to form a single large tooth.
  • If the union occurs after calcification, there is union of roots only. The tooth may have separate or fused root canals.
  • Fusion of teeth is more common in deciduous teeth.
  • Example: - (Click Here)


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