Deciduous Teeth & Growth Abnormalities

Question 1

Primary teeth generally erupt or emerge into the oral cavity between the ages of __________.

Answer 1

3 to 6 weeks

Question 2

At ________ of age, permanent teeth begin to erupt.

Answer 2

3 months

Question 3

Cats should have ___ adult teeth
Dogs should have ____ adult teeth.

Answer 3

cats - 30
dogs - 42

Question 4

Which teeth erupt as permanent teeth without deciduous teeth?

Answer 4

1st premolars (x05) and
molars (x09, x10, x11)

Question 5

As permanent teeth develop within the jaw, what causes deciduous teeth to fall out?

Answer 5

resorption of the roots by surrounding tissues.
osteoclasts resorb alveolar bone which forms an eruption pathway for the tooth to exit its bony crypt.

Question 6

What is the treatment for deciduous tooth fracture and why?

Answer 6

extraction
when these teeth break, the pulp is exposed and this is a direct tract for bacteria. If the pulp becomes infected/necrotic, then the infection may affect the area surrounding the root, even the permanent tooth.

Careful during extraction, these teeth are easily fractured. And, take extreme caution NOT to traumatize the adult tooth bud or tooth, or you may cause it to never erupt.

Question 7

What are the 2 types of unerupted teeth?

Answer 7

1. submerged – partially erupted through bone, but covered by gingiva
2. embedded - completely covered by bone

Question 8

What are mechanical barriers that can lead to missing teeth?

Answer 8

1. closed diastema (no space for eruption)
2. malocclusion (other teeth obstruct eruption path)

Question 9

What is adontia?

Answer 9

teeth that never developed congenitally.

Question 10

what is the treatment for submerged (partially erupted)/ tissue impaction teeth?

Answer 10

operculectomy (surgical removal of gingiva and any bone that is impeding eruption while preserving sufficient gingival collar)

Question 11

_________ is a fluid-filled cyst surrounding the crown of an unerupted tooth. This develops from epithelium associated with enamel formation.

Answer 11

dentigerous cyst

they will keep expanding and destory everything in their way. They an destroy support for adjacent teeth and weaken the jaw to pathological fracture. They can also cause external resorption of the roots they come into contact with.

Question 12

what is the treatment for dentigerous cysts?

Answer 12

remove the tooth AND the cyst lining! if you do not remove the lining, it will come back.

Question 13

what breeds are predisposed to extra teeth (persistent, retained deciduous teeth)?

Answer 13

1. boxers
2. pugs
3. dachshunds

Question 14

What is the treatment for persistent (Retained) deciduous teeth?

Answer 14

extraction!
they can displace adult teeth (base narrow) and/or lead to periodontal disease development due to lack of gingival collar between the teeth.
They can also lead to dentigerous cysts.

Question 15

What is the treatment for a deciduous tooth that is present with NO permanent tooth?

Answer 15

they may remain if healthy, but they dont tend to do well long-term they usually fracture. One root also often tends to resorb. If they are beginning to resorb, then remove them.

Question 16

Which breed is predisposed to having supernumerary incisors?

Answer 16

boxers

Question 17

T/F: malformed teeth can be a result of trauma during development or genetic

Answer 17

true
they do not require extraction if they are healthy. extractions can be difficult, especially if malformed portion is roots.

Question 18

what is a dilacerated manidbular first molar?

Answer 18

roots are more parallel or convergent. this is common in very small dogs and is usually bilaterally symmetric.
these must be removed because there are openings directly into the pulp chamber at the base of the crown or in furcation

Question 19

What is a tooth fusion?

Answer 19

joining of 2 developing teeth that have different tooth buds, so tooth count will be missing one tooth.

Question 20

what is a gemini tooth?

Answer 20

tooth bud divided to attempt to form 2 teeth (normal teeth numbers)

Question 21

__________ is inadequate deposition of enamel during tooth development. This can occur due to insult during enamel formation.

Answer 21

enamel hypoplasia

insults include distemper, fever, trauma, nutrition

they dont always have structural defects, but just have irregular pitted enamel surfaces, discoloration, and dentin exposure
they can lead to early plaque, gingivitis, or periodontal disease.

Question 22

Enamel staining is secondary to administration of what drug during enamel formation?

Answer 22

tetracyclines
this occurs PRIOR to eruption and the drug becomes calcified in the tooth.