Tooth Formation Abnormalities
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Persistent deciduous tooth (DT/P):
A deciduous tooth that is present when it should have exfoliated
Supernumerary tooth (T/SN):
Presence of an extra tooth (also called hyperdontia)
Hypodontia (HYP):
Developmental absence of few teeth
Oligodontia (OLI):
Developmental absence of numerous teeth
Anodontia (ANO):
Failure of all teeth to develop
Macrodontia (T/MAC):
Tooth/teeth are larger than normal
Microdontia (T/MIC):
Tooth/teeth are smaller than normal
Transposition (T/TRA):
Two teeth that have exchanged position
Fusion (T/FUS):
Combining of adjacent tooth germs and resulting in partial or complete union of the developing teeth; also called synodontia
Concrescence (T/CCR):
Fusion of the roots of two or more teeth at the cementum level
Fused roots (T/FDR):
Fusion of roots of the same tooth
Gemination (T/GEM):
A single tooth bud’s attempt to divide partially (cleft of the crown) or completely (presence of an identical supernumerary tooth); also called twinning
Supernumerary root (T/SR):
Presence of an extra root
Dilaceration (T/DIL):
Disturbance in tooth development, causing the crown or root to be abruptly bent or crooked
Dens invaginatus (T/DEN):
Invagination of the outer surface of a tooth into the interior, occurring in either the crown (involving the pulp chamber) or the root (involving the root canal); also called dens in dente
Enamel pearl (E/P):
Small, nodular growth on the root of a tooth made of enamel with or without a small dentin core and sometimes a covering of cementum
Unerupted tooth (T/U):
Tooth that has not perforated the oral mucosa
Embedded tooth (T/E):
Unerupted tooth covered in bone whose eruption is compromised by lack of eruptive force
Impacted tooth (T/I):
Unerupted or partially erupted tooth whose eruption is prevented by contact with a physical barrier
Dentigerous cyst (DTC):
Odontogenic cyst initially formed around the crown of a partially erupted or unerupted tooth; also called follicular cyst or tooth-containing cyst; removal is abbreviated DTC/R
Folliculitis (FOL):
Inflammation of the follicle of a developing tooth
Pericoronitis (PEC):
Inflammation of the soft tissues surrounding the crown of a partially erupted tooth