Dental Anomalies
Terms
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- Anodontia
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missing teeth
e.g. missing lateral incisors or perm 2nd premolars (3rd common site of missing teeth) - supernumerary teeth
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90% occur in maxillary
mesiodens (in between maxillary centrals)
common max: 3rd molars
common mand: 2nd premolars - Gemination
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aka Twinning
1 root, 1 pulp chamber
splitting of tooth germ - fused teeth
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2 roots, 2 pulp chambers
caused by pressures during dental development and tooth eruption - Hutchinson's teeth
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Mulberry Molars
due to congentital syphillis
also have notched incisors -
Carabelli's Trait
Carebelli's cusp: -
acessory cusps or tubercles on teeth
5th cusp on ML cusp of max 1st molar - Enamel Pearls
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in furcation of max. molars
may lead to periodontal problems. seen in radiographs - Taurodontia
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Long pulp chambers.
aka Bull Teeth - Talon Cusps
- enamel projection in cingulum area of anterior permanent teeth. may contain pulp horn. may cause occlussal interference
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Microdontia
Macrodontia -
correct shape, smaller size. seen in lateral and 3rd molars
normal shape, bigger size. seen in incisors and canines - dilaceration
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bend at the apical tip (45-90 degrees)
due to crowding during development - dens in dente
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tooth within tooth. Due to invagination of enamel within crown of tooth. seen in incisors as deep groove. found on radiograph.
max laterals most commonly affected - concrescence
- joining of 2 teeth at the cementum around the root, after eruptoon
- enamel hypoplasia
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enamel growth halted. due to disturbance of ameloblasts during enamel matrix formation
caused by trauma or disease
e.g. turner's tooth (deciduous teeth infection) - enamel hypocalcification
- disturbance in enamel matrix maturation. low minaral deposits, white spots
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enamel dysplasia
fluorosis -
high fluoride in diet
mild --> white spots
severe --> dark brown spots
can see mottling or pitting of enamel (severe) -
dentin dysplasia
dentinogenesis imperfecta -
herditary.
teeth appear blue/gray to yellwish.
no pulp or root canals. teeth weak and prone to fracture - tetracycline staining
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when taken during tooth formation
either dentition may be affected - transposition
- misplaced tooth buds --> teeth develop in wrong place