JVD 2019 #4 Prevalence of Malocclusion of Deciduous Dentition in Dogs: An Evaluation of 297 Puppies; Hoyer + Rawlinson Flashcards Preview

JVD 2019-2021 > JVD 2019 #4 Prevalence of Malocclusion of Deciduous Dentition in Dogs: An Evaluation of 297 Puppies; Hoyer + Rawlinson > Flashcards

Flashcards in JVD 2019 #4 Prevalence of Malocclusion of Deciduous Dentition in Dogs: An Evaluation of 297 Puppies; Hoyer + Rawlinson Deck (8)
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1
Q

How many puppies (8 to 12wk) were identified as having a malocclusion in the 1-yr study period?

A

26% (77 of 297 puppies)

* dogs of breeds with MAL3 ‘normal’ considered normal for study

2
Q

Was a significant difference in prevalence noted between purebred and mixed breed dogs?

A

No significant difference in prevalence.
But in single dogs (not litters) purebreds had a significantly higher percentage of malocclusion compared to mixed breeds 33.8% and 20% respectively. The opposite was true in puppies presented as litters- none in purebred and 23.5% in mixed breed litters

3
Q

What was the most common malocclusion class 1 (MAL1)?

A

MAL- linguoversion of one or both decid MN canines (11/12, 92%)
Caudal crossbite considered MAL1

4
Q

Embryologically, where do the bones of the maxilla and mandible result from?

A

Development of the first brachial arch, which are organizations of migrating neural crest cells in the developing embryo

5
Q

What kind of bone growth does the skull primary display?

A

Intramembranous ossification- direct formation of bony matrix within existing connective tissues

6
Q

When does mandibular growth occur in the rostral mandible?

A

Very early in development, after approx day 50 (week 7) all growth is from caudal to the 1st molar in the area of the condyle

7
Q

Where does maxillary bone growth occur

A

at the incisive-maxillary and palatal-maxillary sutures. The contribution of the length of palatal bones decreases with age and the comparative length of the incisive and maxillary bones increases with age.

8
Q

What growth disruption causes disparity of the maxilla and mandible of brachycephalic dogs?

A

Primarily chondrodystrophic arrest of the bones of the maxilla and likely develops between the 8-12 weeks and facial maturity

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