Learning Center


Author :

Trishul Allareddy BDS, MS
Diplomate of ABOMR Clinical Professor and Director of Oral and Maxillofacial Radiology


  • Fusion is often referred to as Synodontia
  • In Fusion, two developing tooth buds fuse together resulting in a double tooth
  • The resulting tooth results in a double tooth like tooth
  • When Fusion occurs, it results in an overall reduction in the number of teeth by one
  • More frequent in primary dentition

Clinical and Radiographic features

  • The tooth that has undergone fusion is often large resembling a macrodont and may have a malformed appearance due to two teeth with varied morphology being fused
  • Fusion is more common in anterior teeth and may be partial or complete

Differential diagnosis

  • Fusion needs to be differentiated from Gemination
  • In fusion the overall number of teeth is reduced by one if the double tooth is counted as a single tooth
  • In gemination the overall number of teeth remains the same if the double tooth is counted as a single tooth
  • The teeth that fuse are often close to each other in odontogenesis

Example 1

Example 2

Example 3

Example 4


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