FINAL EXAM - Deviations

Question 1

Impactions

Answer 1

Teeth lodged in soft tissue/bone - and do not erupt

may be partially impacted

Question 2

Mulberry Molars

Answer 2

• Localized enamel ‘hypoplasia’ (deficits in enamel formation) that occurs during tooth development
• Molars have abnormally shaped occlusal surface (berry-like nodules instead of cusps)
• Cause: viral infection passed from mother to fetus

Question 3

Enamel Pearl

Answer 3

• Enamel droplet on furcation area
• May encourage perio disease (PDL cant attach to enamel)
• Removed through odontoplasty

Question 4

Dilacerations

Answer 4

• Sharp bend in root surface
• May make root canal or extraction difficult
• Cause: displacement of root during development - or trauma

Question 5

Dentigenerous cyst

Answer 5

• Cyst formed on crown of unerupted tooth

Question 6

Microdontia

Answer 6

• Abnormally small teeth with altered shapes
• “Peg lateral” (max. lateral incisor)
• Generalized: pituitary dwarfism OR relatively large max or mand.

Question 7

Macrodontia

Answer 7

• Abnormally large teeth - but same proportions of tooth structures
• Usually results in crowding
• Most commonly: mand. 3rd molars
• Generalized: pituitary gigantism OR relatively small max or mand.

Question 8

Mesiodens

Answer 8

• Extra tooth between max. central incisors
• Smaller than a normal tooth
• May or may not be erupted

Question 9

Tubercles

Answer 9

Accessory cusps

Question 10

Partial Microdontia

Answer 10

Tooth smaller in size

Question 11

Anodontia/hypodontia

Answer 11

• Congenitally missing teeth

- Most commonly: 3rd molars, 2nd premolars or max lateral incisors

Question 12

Gemination

Answer 12

• A singe tooth germ tries to divide into 2 - but forms 1 large single rooted tooth
• Most commonly: anterior teeth of both dentitions
• Partial crowns, sharing a root

Question 13

Fusion

Answer 13

• Joining of 2 seperate tooth germs with the elimination of a space between the 2 teeth.
• Most commonly: incisors

Question 14

Concrescence

Answer 14

Teeth joined at the roots AFTER the tooth has formed

• May be related to trauma or crowding
• Most commonly: max 2nd and 3rd molars

Question 15

Dens in Dente - Invaginatus

Answer 15

• Condition where the outer tissue folds inwards and results in the accentuation of the lingual pit
• Radiographicly looks like a tooth within a tooth
• Most commonly: max. lateral incisors
• Difficult to clean & susceptible to decay

Question 16

Dens Evaginatus

Answer 16

• Extra cusp in center of occlusal surface with pulp horn

- Occlusar wears quickly and exposes pulp

Question 17

Taurodont

Answer 17

• Large, elongated pulp chambers

- Apically position furcation

Question 18

Hyperdontia

Answer 18

• Extra teeth (above normal number)

Question 19

Amelogenesis Imperfecta

Answer 19

• A deficit in enamel (hypoplasia, hypocalcification, hypomaturation)
• Normal pulp and dentin - reduced enamel
• Cause: hereditary
• Clinical tooth color: white, yellow, brown

Question 20

Dentinogensis Imperfecta

Answer 20

• A deficit in dentin
• Teeth are weaker than normal (rapid wear, breakdown and loss)
• Cause: hereditary
• Clinical tooth color: blue-gray or yellow-brown, translucent

Question 21

Retained roots

Answer 21

Parts of roots left in the tissue