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Front Back
Microdontia
Smaller than normal

"Peg" lateral

Lack of development of mesial and distal lobes
Gemination
One tooth, one bud

Incomplete splitting

wider than normal
Twinning
Two teeth, one bud

Like germination except that splitting all the way through and into two teeth
Fusion
Two teeth, two buds

Fusion of dentin

Two identifable pulp cavities

fused teeth count as one
Concresence
Two eeth, two buds

Fusion of cementum
Hypohydrotic Ectodermal Dysplasia 
Conical shaped teeth
Hutchinson's incisors
Notched incisors
Hypodontia-congenital
Teeth missing because of agenesis
Adontia
No teeth develop
Oligodontia
Numberous congenitally missing teeth (from birth)
Acquired hypodontia
Loss of teeth due to trauma or extraction
Edentulous
Whitout teeth
Complete Edontulism
All teeth extracted
Mesiodens
A supernumary tooth arising in the midline of the maxilla
Class 3 lesions
Can be seen by transillumination
Diastema
Gap between front teeth
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