Development Disturbance Flashcards
(29 cards)
Presence of unusually small teeth
Teeth smaller than normal
Microdontia
Presence of unusually large teeth
Teeth larger than normal
Macrodontia
Total lack of tooth development
Frequently associated with hereditary Ectodermal dysplasia
Anodontia
Lack of development of one or more teeth (<6
teeth are missing)
Hypodontia
Subdivision of hypodontia
Lack of development of >6 teeth excluding third
molars
Oligodontia
More common in permanent dentition - most common in maxilla
Anterior midline of maxilla - most common site
Maxillary molar area - most second common
site
Hyperdontia / suppernumerary teeth
Small peg-shaped: usually presents as mesiodens
Develop with root ahead of or at an equivalent stage
Conical
Occurs in the midline between the
maxillary central incisors; often has
conical or peg shape
Mesiodens
Posses more than one cusps or tubercle
Barrel-shaped and may be invaginated
Root formation is delayed
Tuberculate
Accessory cusp of an anterior tooth that is located most often on the palatal surface
Talon cusp
Duplication of teeth in the normal series and is found at the end of a tooth series
Most common supplemental tooth -
permanent maxillary lateral incisors
Supplemental premolars and molars also occur
Supplemental
Tooth lying lingual to, or buccal to, maxillary or mandibular molars
Paramolar
Accessory fourth molar
DISTOMOLAR / DISTODENS
any tumor or odontogenic origin
■Hamartomatous malformation
Odontome
Prematurely erupted deciduous teeth mandibular central incisor
● Appearing at the time of birth - natal teeth
● Arising within the first 30 days of life - neonatal
teeth
Predeciduous teeth
Teeth that cease to erupt before emergence
● Most frequently impacted teeth - mandibular
third molar
Impaction
Fusion of two teeth from single enamel organ
● Anomalies which arise from an attempt at division of a single tooth germ by an invagination, with resultant incomplete formation
of two teeth
Gemination
Joining of two developing tooth germs, resulting in a single large tooth structure
● May involve the entire length of the teeth, or it may involve the roots only - cementum and dentin are shared
Fusion
Form of fusion in which adjacent, already formed teeth are joined by cementum
Conrescence
Extraordinary curving or angulation of tooth roots
Dilaceration
Accessory cusp that originated from the central groove or lingual ridge of the buccal cusp of a premolar or molar tooth
Relatively common developmental condition affecting predominantly premolar teeth (Leong’s premolar)
Dens evaginatus
tooth within a tooth
Deep surface invagination of the crown or root
that is lined by enamel
Dens in dente or dens invaginatus
Variation in tooth form in which teeth have elongated crowns or apically displaced furcation, resulting in pulp chambers that have increased apical - occlusal height
Taurodontism
Accessory roots are most commonly seen in mandibular canines, premolar, and molars (especially third molars)
Supernumerary root
