Tooth Abnormalities Flashcards
Microdont
Small tooth
Macrodont
large tooth
Taurodont
Enlargement of the body and pulp chamber of a multi-rooted tooth with apical displacement of the pulpal floor and bifurcation
Gemination
one trying to be two. Normal count
Fusion
two trying to be one. missing one tooth in count
Dilaceration
Sharp bend in roots
Talon Cusp
A well-delineated additional cusp on the surface of an anterior tooth
Dens evaginatus “Leong premolar”
Cusp-like elevation of enamel located in the central groove or lingual ridge of the buccal cusp of premolar or occasionally molar teeth
Usually bilateral
Usually mandible
50% of cases pulp extends into accessory cusp
Occlusal interference causes wearing/fracture
Pulpal necrosis
Dens invaginatus “dens in dente”
deep surface invagination of tooth, lined by enamel
Enamel Pearl
Hemispheric structures composed entirely of enamel or containing underlying dentin and pulp
hypercementosis
excess cementum. PDL SURROUNDS THE ENTIRE STRUCTURE
concrescence
union of two teeth with cementum
Hypodontia
lack of development of teeth.
Oligodontia - missing 6+ not including 3rd molars
Ectodermal dysplasia
Group of inherited conditions in which two or more ectodermally derived anatomic structures fail to develop. Skin Hair Nails Teeth Sweat glands
retained deciduous teeth
self explanatory
hyperdontia
supernumerary teeth
impacted teeth
cease to erupt before emergence
ankylosis
Anatomic fusion of cementum or dentin with the alveolar bone
Extrinsic vs Intrinsic staining
Extrinsic
Tobacco, coffee, etc
Intrinsic
tetracycline, DI, internal resorbtion (pink tooth of mummery), resorcinol
Fluorosis
Zones of yellow to dark brown discoloration “mottled enamel”
BILATERALLY SYMMETRIC
Focal enamel hypoplasia “Turner’s tooth”
Enamel defect in permanent dentition caused by trauma or periapical inflammatory disease of the overlying deciduous tooth
Chronologic enamel hypoplasia
fever during tooth development, looks like a band across teeth all in same level
Amelogenesis Imperfecta
clincally thin enamel. discolored teeth. normal dentin and pulp chamber
Dentinogenisis imperfecta
opalescent discoloration, bulbous crowns, cervical constriction, obliteration of pulp canals
Osteogenesis imperfecta with opalescent teeth
Bone fractures, long bone and spine deformity, growth impairment, blue sclerae, hearing loss, Wormian bones in the skull, dental alterations clinically and radiographically identical to dentinogenesis imperfecta
