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Dental Anomalies

Terms in this set (31)

anodontia
term for "absence of teeth"

can be partial or complete
complete anodontia
the absence of any teeth, the lack of primary or permanent teeth
congenitally missing teeth (partial anodontia)
may involve 1 or numerous missing teeth. often observed as a familiar trait
third molar (maxillary more commonly missing than mandibular)
most common congenitally missing tooth
maxillary lateral incisor
most commonly missing anterior tooth

(2nd most commonly missing of all teeth)
mandibular second premolar
most commonly missing tooth after 3rd molars and maxillary lateral incisor
supernumerary teeth
"extra teeth"
low (.5%)
is occurance of supernumerary teeth in primary dentition low or high?
maxilla
is occurance of supernumerary teeth more common in maxilla or mandible?
mesiodens
cone shaped small supernumerary tooth that forms between central incisors.

often causes a diastema (space between central incisors)

seen in 1-2% of population
third molar (maxillary more than mandibular), lateral incisors
these are the two teeth most likely to be variable.

most variable first, 2nd most variable 2nd

(separated y comma)
peg shaped lateral incisors
common variability seen in lateral incisors
Gemination (twinning)
results from incomplete splitting of the single forming tooth (or tooth germ)

division is incomplete and results in a large crown with a single root and pulp canal

- most common in:
--- maxillary anteriors
--- primary dentition

counted as 1 tooth to get normal number of teeth
Fusion
characterized by the merging of 2 adjacent teeth

results in:
- 2 distinct roots
- 2 distinct pulp chambers

counted as 2 teeth to get normal number of teeth

most common with
-- anterior teeth
-- primary teeth
Hutchinson's teeth
unusually shaped incisors or molars caused by prenatal syphilis

Screwdriver shape
- may occur in Mx and Mn Incisors

Mulberry Molars
- may occur in first molars
true
t or f

accessory cusps, tubercles, and ridges may be found on almost any tooth
tuberculum intermedium
term that might be used to describe a 3rd lingual cusp on a mandibular molar
tuberculum sextum
term that might be used to describe an extra cusp on a distal marginal ridge
enamel pearls
fall under the both categories as an abnormal tooth morphology and abnormal root morphology

they are small round nodules with a core of dentin
taurodont (bull tooth)
abnormality in teeth characterized by a long pulp chamber with no cervical constriction and little differentiation of root structure
talon cusps
enamel projection most often projecting from the cingulum area on anterior teeth
macrodontia
normally shaped tooth, except tooth is very large
microdontia
normally shaped tooth, except tooth is very small
shovel shaped incisors
present most commonly in:
- Asian
- eskimo
- mongoloid
- amaerican indian

pronounced cingulum and marginal ridges
abnormal root morphology
this class of abnormality can only be observed through radiograph or extracted teeth
dilaceration
-abnormal root morphology

severe bend or distortion of a tooth root
dens in dente (tooth within a tooth)
abnormal root morphology

appears as a deep crevice usually in the cingulum of the incisors

most often observed in maxillary lateral incisors
concrescence
abnormal root morphology

superficial fusion of the cementum layer of adjacent teeth

occurs most commonly in Mx molar region
dwarfed roots
abnormal root morphology

small roots with a normal sized crown
hypercementosis
abnormal root morphology

occurs after tooth has erupted into oral cavity
accessory roots
abnormal root morphology

teeth with extra roots

commonly found in 3rd molars

may be observed in any multi-rooted teeth and teeth whose common presentation is single rooted
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