Anomalies based on Size:-
Having one or more teeth that are smaller than normal.
Having one or more teeth that are larger than normal.
Anomalies based on Number:-
■ Complete anodontia:-
Congenital absence of teeth; generally due to developmental abnormalities such as ectodermal dysplasia.
■ Partial anodontia:-
Congenital absence of one or more teeth.
Congenital absence of a few teeth.
Congenital absence of a large number of teeth.
■ Supernumerary teeth:-
Teeth in excess of the normal number. Most common in maxilla.
A supernumerary tooth located between the maxillary central incisors.
Anomalies based on Morphology:-
Fusion of the tooth and alveolar bone.
A bend in the root of a tooth.
A molar with an elongated root trunk. Generally occurs in patients with amelogenesis imperfecta, Klinefelter’s syndrome, or Down’s syndrome.
■ Dens invaginatus (dens in dente):-
Developmental abnormality of maxillary lateral incisors in which the focal crown is invaginated for various distances.
■ Dens evaginatus:-
Developmental abnormality in which a focal portion ofthe crown projects outward, creating an extra cusp. A prominent dens evaginatus often seen on maxillary lateral incisors is called a talon cusp.
Excessive deposition of cementum.
An acquired disorder in which the roots of one or more teeth are united by cementun alone after formation of the crowns
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