Learning Center

Gemination

Author :

Trishul Allareddy BDS, MS
Diplomate of ABOMR Clinical Professor and Director of Oral and Maxillofacial Radiology
veeratrishul-allareddy@uiowa.edu

Buccal Bifurcation Cyst

  • Gemination is often referred to as twinning
  • In Gemination, a developing tooth tries to divide into two teeth albeit unsuccessfully
  • The resulting tooth has a double tooth like appearance
  • Gemination may be in the crown or extend all the way into the length of the root
  • TWhen gemination is successful, it results in a supernumerary tooth in addition to the normal complement of the tooth
  • Gemination is more frequent in primary dentition

Clinical and Radiographic features

  • The tooth that has undergone gemination is often large resembling a macrodont
  • The tooth has an invagination in the crown and may involve the root as well

Differential diagnosis

  • Gemination needs to be differentiated from fusion
  • In gemination the overall number of teeth remains the same if the double tooth is counted as a single tooth
  • In fusion the overall number of teeth is reduced by one if the double tooth is counted as a single tooth

Gemination
Example 1

Gemination
Example 2

Gemination
Example 3

Gemination
Example 4

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