Dental Anomalies

Question 1

Deviation from normal usually related to embryonic development

Answer 1

Anomaly

Question 2

Where do more anomalies usually occur?

Answer 2

-Permanent dentition
-Maxilla

Question 3

What is the anomalies occurrence percentage?

Answer 3

less than 2%

Question 4

Absence of teeth

Answer 4

Anodontia

Question 5

Missing one or two teeth

Answer 5

Partial hypodontia

Question 6

What does anodontia usually occur from?

Answer 6

A disturbance during the initiation stage

Question 7

What is needed to prove teeth are missing?

Answer 7

Radiograph

Question 8

What are the most common missing teeth in order?

Answer 8

1. Maxillary 3rd molars
2. Maxillary lateral incisors
3. mandibular 2nd premolars
4. Canines

Question 9

Extra teeth

Answer 9

Supernumerary teeth

Question 10

What percentage of the population does supernumerary teeth occur in?

Answer 10

0.3-3.8%

Question 11

What are the most common areas for supernumerary teeth?

Answer 11

-Maxillary incisor area
-Maxillary 3rd molar area

Question 12

What does supernumerary teeth usually occur from?

Answer 12

A disturbance during the initiation stage

Question 13

Small supernumerary tooth forms between central incisors

Answer 13

Mesiodens

Question 14

What is often thought to be genetic, but may be microdontia from developmental disturbance during bud stage?

Answer 14

Peg shaped laterals

Question 15

Teeth developed from one lobe instead of four

Answer 15

Peg shaped laterals

Question 16

Splitting of a single forming tooth

Answer 16

Germination (twinning)

Question 17

Tooth division is incomplete so twinned crowns appear double in width and possibly notched

Answer 17

Germination

Question 18

Single tooth root is not split and has common pulp canal

Answer 18

Germination

Question 19

Tooth count is normal

Answer 19

Germination

Question 20

Union of tooth germs always involving dentin

Answer 20

Fusion

Question 21

-Fused teeth have one crown that appears doubled
-Two separate but fused roots with separate pulp chambers

Answer 21

Fusion

Question 22

-Thought to be caused by pressure or force during root formation
-One less tooth count

Answer 22

Fusion

Question 23

Mother passes syphilis onto her unborn baby
-Can affect both dentitions

Answer 23

Hutchinson’s incisors / Mulberry molars

Question 24

-Incisors may be screwdriver shaped, broader cervically, notched incisal edge
-First molars may have multiple berry like tubercles

Answer 24

Hutchinson’s incisors / mulberry molars

Question 25

Extra projection resembling an eagle's talon

Answer 25

Talon cusp

Question 26

Extra cusp

Answer 26

Tuberculum intermedium

Question 27

Small round nodules of enamel with a tiny core of dentin

Answer 27

Enamel pearls

Question 28

-Bull or prism teeth -Very long pulp chamber without constriction at CEJ -Most often seen in American Indians/Artic

Answer 28

Taurodontia

Question 29

Severe bend or angular distortion of a tooth root -May be result of trauma or insufficient space

Answer 29

Dilaceration (flexion)

Question 30

Developmental resulting from the invagination of the enamel organ without the crown of a tooth

Answer 30

Dens in dente

Question 31

Teeth fail to erupt due to lack of eruptive force

Answer 31

Unerupted teeth

Question 32

Teeth fail to erupt due to mechanical obstruction

Answer 32

Impacted teeth

Question 33

What is initiated by an infection or trauma to the periodontal ligament? -Loss of PDL space so the tooth root is fused to alveolar bone

Answer 33

Ankylosis

Question 34

What indicates abnormal development?

Answer 34

Dysplasia

Question 35

What refers to formation or development?

Answer 35

Terms ending in plasia

Question 36

Disturbance in enamel-forming cells - ameloblasts -May be a result from high fever, nutritional deficiencies, or excess amount of fluoride

Answer 36

Enamel dysplasia

Question 37

-Hereditary disorder affects both dentitions -Rough yellow to brownish crowns

Answer 37

Amelogenesis Imperfecta

Question 38

Mottled or pitted enamel

Answer 38

Fluorosis

Question 39

Incomplete development of enamel - localized discolored spot -Most likely caused by infection of tooth

Answer 39

Focal hypoplasia (turner tooth)

Question 40

What is in 1:8000 people?

Answer 40

Dentin dysplasia

Question 41

Affects dentin formation of both dentitions -Light blue-gray to yellow opalescent -Weak teeth Absence of pulp chamber and canal due to calcification

Answer 41

Dentinogenesis imperfecta

Question 42

Yellow to gray brown color of teeth

Answer 42

Tetracyline stain

Question 43

What is not considered an anomoly?

Answer 43

Changes in tooth shape after eruption

Question 44

Wearing away of enamel from tooth-to-tooth movement -Bruxism

Answer 44

Attrition

Question 45

Wearing away of tooth structure by mechanical force -Toothbrushing, tobacco

Answer 45

Abrasion

Question 46

Loss of tooth structure by chemical means -Acid reflux, drinks

Answer 46

Erosion

Question 47

Cervical loss of tooth structure thought to occur from tooth bending under heavy occlusal forces

Answer 47

Abfraction