Anomalies Flashcards
Total Anodontia
Never had any teeth
Partial Anodontia
Never having one or more teeth
Partial Anodontia-Most commonly missing perm. teeth
1) Third molars (especially maxillary)
2) Max LI (1-2%)
3) Mand 2P (1%)
Partial Anodontia-Most commonly missing primary teeth
Mand CI
*Perm Mand CI can be mising too
When/where do extra or supernumerary teeth occur
Maxillary and permanent dentition
Mesiodens
Supernumerary tooth between Max CI
Extra molars may be called
paramolar, distomolar, or fourth molar
T o F: Supernumerary teeth will lead to an excessive number of teeth
False, may just replace a different tooth
What teeth are most commonly supernumerary
1) Maxillary incisor area
2) Third molar area
3) Mand. premolar area
What tooth most likely to have crown malformed?
3rd molar
What teeth may be peg shaped?
Max LI (1-2%) Max CI (Very rare)
Gemination (twinning)
one crown Double in width One root-one pulp chamber one canal *i.e. there are still 4 incisors but can count 5
Fusion
two adjacent crowns fuse
two roots-two pulp chambers
Two canals
*i.e. there are only 3 incisors but can count 4
Gemination and fusion occur in perm or prim dentition
primary usually
Hutchinson’s incisors
aka screwdriver teeth
Caused by congenital syphilis
Have V shape- dont confuse w/ fusion!
Congential syphilis marked by Hutchinson’s incisors as well as ___________?
Mulberry molars
Molars with many tubercles on occlusal
Unusually prominent ridge on facial surface most likely on _____?
Maxillary CI
Types of extra cusps
Tuberculum intermedium-third (middle) lingual cusp on mand. molars
Tuberculum sextum-distal cusp on mand. molars
Talon cusp
Similar to extra lingual cusp but have their own pulp horn
*Must do root canal to remove
What teeth usually affected by macrodontia
Incisors and canines
What teeth usually affected by microdontia
Max LI and 3M
Shovel shaped max incisors more common in ____
Native americans, asian, mongoloid, and eskimos
Dilaceration
severe bending at CEJ
Flexion
Severe bending at location other than CEJ
Dilaceration and flexion usually caused by?
Trauma
Enamel pearls
Pearl of dentin w/ enamel cover
-more problematic near CEJ but do not remove them
Taurodontia
think “toro”-dontia=Bull tooth
More common in neanderthals, native americans, and eskimos
Very large pulp chamber in molars
Dens in dente aka Dens invaginatus
Tooth within a tooth
*allows communication w/ internal structure so must seal w/ composite
Hypercementosis
Thickening of cementum caused by trauma or metabolic dysfunction
Causes webbed roots
Concresence of roots
joining of cementum of adjacent teeth AFTER eruption
Dwarfed roots
Hereditary or caused by ortho treatment done too quickly
Localized-doesn’t affect all teeth
Accessory roots most common on what teeth in maxillary arch
First premolar
Accessory roots most common on what teeth in mandibular arch
Canine and premolar (facial and lingual roots)
Impacted tooth
Cannot erupt due to mechanical obstruction
Unerupted tooth
does not have eruptive forces
Transposition
tooth trades place with another tooth
Ankylosis
Failure to complete eruption of permanent tooth due to trauma or infection
Loss of pdl so root fuses to bone
Ectopic
tooth erupts somewhere other than arch
Types of enamel dysplasia
1) amelogenesis imperfecta
2) fluorosis
3) enamel damage from high fever
4) focal hypermaturation
Amelogenesis imperfecta
Faulty enamel formation
Hereditary
Total or partial lack of enamel
both dentitions
Fluorosis
Too much fluoride during formation
Mild=mottled enamel
Severe=pitted enamel
Enamel damage due to high fever causes
pitted enamel
Focal enamel hypoplasia
aka turner’s tooth
local trauma or infection
Types of dentin dysplasia
dentinogenesis imperfecta
tetracycline stain
Dentinogenesis imperfecta
faulty dentin formation
hereditary
both dentitions
Attrition
wear of enamel and dentin due to opposing tooth
Abrasion
Wear due to mechanical means
Abfraction
bending of tooth due to heavy occlusion with enamel chippin off at cervical
Erosion
wear due to chemical agents
Bruxism
40 min of contact every hour during night
