Dental Anomalies

Question 1

Dental anomalies occur more often in the __________ dentition

Answer 1

permanent

Question 2

dental anomalies occur more often in the __________ arch

Answer 2

maxillary

Question 3

total (complete) anodontia

Answer 3

absence of any teeth

total lack of primary or permanent

Question 4

total anodontia is most often associated with…

Answer 4

abnormal development of the ectoderm

may also find deviations in hiar, nails, sweat glands, salivary glands

Question 5

partial anodontia

Answer 5

congenitally missing teeth
1 or more missing teeth from the dentition
often familial trait

Question 6

List the most common congenitally missing teeth from most common - least common

Answer 6

mx 3rds
md 3rds
md 2nd premolars
mx lateral incisors

Question 7

what % of the population have missing mx laterals

Answer 7

1-2%

Question 8

supernumerary teeth occur most often in the ______ arch

Answer 8

maxilla
can be found in any segment of the arch
varied forms

Question 9

% occurrence of supernumerary teeth in primary dentition

Answer 9

.5%

Question 10

mesiodens

Answer 10

cone shaped supernumerary small tooth that forms between the centrals
may be erupted or unerupted
often causes a diastema

Question 11

supernumerary teeth in 3rd molar region most commonly found in ______ arch

Answer 11

maxillary

may also be seen in the mandible

Question 12

names for supernumerary teeth in third molar region

Answer 12

distomolars
paramolars
4th molars

Question 13

Most common places to have supernumerary teeth

Answer 13

between mx centrals
3rd molar region
mandibular premolar area (similar in shape and size to md premolar)

Question 14

third molars are more variable in the ______ arch

Answer 14

maxillary

Question 15

variations of third molars

Answer 15

vary considerably in crown shape
small, peg shaped
large variations resembling 1st and 2nd molars

Question 16

peg laterals may be a variable expression of….

Answer 16

the same genetic trait that results in missing laterals

Question 17

gemination (twinning)

Answer 17

incomplete splitting of single forming tooth (tooth germ)
results in large crown with single root and pulp canal
If it is counted as a SINGLE tooth the dentition with have the correct # of teeth

Question 18

gemination is most often observed in which teeth

Answer 18

mx anteriors

Question 19

gemination more common in _____ dentition

Answer 19

primary

Question 20

fusion

Answer 20

fusion of two adj teeth
appears similar to gemination
two distinct roots and pulp chambers
dentin involved
total # of teeth will be correct if entity counted as TWO teeth

Question 21

fusion occurs more commonly in which teeth

Answer 21

anterior

Question 22

fusion occus more commonly in the _____ dentition

Answer 22

primary

Question 23

fusion occurs more commonly in _____ incisors

Answer 23

mandibular

Question 24

_____ teeth can also be fused to an adjacent tooth

Answer 24

supernumerary

Question 25

Hutchinson's teeth

Answer 25

unusually shaped incisors/molars caused by prenatal syphilis aka mulberry molars may be an increase in incidence since syphilis has risen recently

Question 26

Hutchinson's teeth - incisors appearance

Answer 26

screwdriver shaped - broad cervical, narrow incisal | notched incisal edge

Question 27

Hutchinson's teeth - first molars appearance

Answer 27

occlusal w numerous poorly developed cusps and ridges | numerous berry-like tubercles

Question 28

accessory cusps, tubercles, ridges can happen where

Answer 28

almost any tooth

Question 29

small enamel projections may result from...

Answer 29

localized enamel hyperplasia | crowded conditions resulting in fusion of a supernumerary tooth

Question 30

tuberculum intermedium

Answer 30

3rd lingual cusp on a md molar

Question 31

tuberculum sextum

Answer 31

extra cusp on a distal marginal ridge

Question 32

enamel pearls

Answer 32

small round nodule with a core of dentin | most often found on distal of 3rd molars or furcation of permenent molars

Question 33

taurodont

Answer 33

bull tooth | characterized by long pulp chamber with no cervical constriction and little differentiation of root structure

Question 34

talon cusps

Answer 34

enamel projection most often coming from cingulum area of anterior teeth may need to remove in order to allow for proper occlusion - may result in pulpal exposure since a pulp horn projecting into the talon cusp is often present

Question 35

macrodontia/microdontia

Answer 35

normally shaped teeth except for size of the tooth/teeth | may present in entire dentition/portion of dentition/single tooth

Question 36

shovel shaped incisors present most commonly in which populations

Answer 36

asian mongoloid eskimo american indian

Question 37

shovel shaped incisors

Answer 37

pronounced cingulum and marginal ridges scoop appearance of lingual may not be a true anomaly but instead a racial physical characteristic

Question 38

double shoveling

Answer 38

pronounced cingulum and marginal ridges AND prominent ridges found on mesial/distal of facial surface

Question 39

dilaceration

Answer 39

severe bend/distortion of a tooth and/or crown | flexion of root often used to describe curve/bend of tooth root

Question 40

dens in dente

Answer 40

tooth within a tooth results from invagination of enamel organ within the crown appears as deep crevice - usually in cingulum of incisors Xray appears as an elongated mass of enamel within the dentin of an average sized tooth may be in peg laterals

Question 41

dens in dente most often observed in _____

Answer 41

mx laterals

Question 42

concrescence

Answer 42

superficial fusion of the cementum of adj teeth | may be related to abnormal cementum deposition

Question 43

concrescence is most common in _______ region

Answer 43

maxillary molar region following eruption

Question 44

dwarfed roots

Answer 44

may present in normal sized crown may be hereditary can be caused by rapid tooth movement during ortho

Question 45

hypercementosis

Answer 45

after tooth has erupted | result of trauma, metabolic dysfunction, periapical inflammation

Question 46

accessory roots are commonly found in ______

Answer 46

third molars