DISORDERS OF DEVELOPMENT OF

TEETH

Dr. Shahzadi Tayyaba Hashmi shahzadi@inaya.edu.sa

A. Microdontia (small teeth):• One or more teeth that are smaller than normal• When all the teeth in both arches are smaller

than normal, the condition is termed as generalized microdontia

Examples:• Maxillary lateral incisors (peg laterals)• Maxillary third molars

Abnormalities in Size of Teeth

B. Macrodontia (Large teeth):• One or more teeth that are larger than normal• When all the teeth in both arches are larger

than normal, the condition is termed as generalized macrodontia

Examples:• Mandibular cuspids (canines)

Abnormalities in Size of Teeth

1. Dilaceration :o a sharp bend or angulation involving the root

of a tootho Can be seen radiographicaly

Causes:o Trauma during tooth developmento Continued rood formation during a curved

path of eruption

Abnormalities in Shape

2. Taurodontism:• Taurodontism means bull-like teeth• A developmental disorder that primarily

affects molars• Both permanent and deciduous teeth may be

affected• Teeth exhibits rectangular shape and apically

displaced furcation results in large pulp chamber and short pulp canals

Abnormalities in Shape

TAURODONTISM

3. Dens invaginatus:• Commonly known as dens in dente (a tooth

within tooth)• Primarily affects permanent maxillary lateral

incisors• Teeth with deep invaginations develop Pulpitis,

pulpal necrosis and inflammatory peri apical disease

Abnormalities in Shape

4. Gemination:• A developmental dental anomaly characterized by

a single rooted tooth with wide, partly divided crown or two separate crowns

• Caused by incompletely divided tooth germ• Gemination can affect permanent and deciduous

dentitions

Abnormalities in Shape

5. Fusion:• A developmental dental anomaly

characterized by abnormally shaped tooth that exhibits a wide crown or a normal crown with an additional root

• Fusion results when two adjacent tooth germs merge producing one tooth

• Incisors are commonly affected

Abnormalities in Shape

Fusion ( commonly seen in incisors)

Gemination

6. Concrescence:• In concrescence, roots of the adjacent teeth are

joined by cementum• Primarily affects permanent maxillary molars

Abnormalities in Shape

Enamel pearls :• An enamel pearl is a condition of teeth where

enamel is found on locations where enamel is not supposed to be, such as on a root surface

• They are found usually in the area between roots, which is called a furcation, of molars.

• Enamel pearls are not common in teeth with a single root

Abnormalities in Shape

• Oral Pathology for the Dental Hygienist (5th Edition) By Olga A. C. Ibsen, RDH, MS and Joan

• Contemporary for oral and maxillofacial pathology by J.Phillip Sapp, Lewis Roy Eversole

ESSENTIAL REFERENCES

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