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EQ dental anat

2011 AAEP Focus on Dentistry

QuestionAnswer
Of what origin is the tissue that initiates tooth formation? epithelial
Within the tooth bud, which type of cells (origin) are present and what do they differentiate into? epithelial cells: ameloblasts mesenchymal cells: odontoblasts + cementoblasts
What initiates tooth formation? Interaction between the ameloblasts and odontoblasts
What component of the dental bud dictates the final shape of a tooth? enamel organ (epithelial origin)
From where is the blood supply of developing teeth derived? dental sac
in addition to the dental sac, where else does blood supply come from? blood supply also perforates the apical aspect of the infundibulum in young equine cheek teeth and these apical infundibular blood vessels may remain for a couple of years after dental eruption
What is Equine type 1 enamel? main constituent of the cheek teeth, consists of parallel rows of prisms lying between parallel, dense interprismatic plates of enamel (very hard)
What is the disadvantage of hardness due to the parallel orientation of type 1 enamel prisms and interprismatic enamel? it is more susceptible to developing fractures
What is Equine type 2 enamel? solely consists of prisms (rounded on cross section) which are oriented in three directions.
How does type 2 enamel compare with type 1? type 1 is harder
Where is type 2 enamel found on equine teeth? incisors
Where is type 1 enamel found on equine teeth? cheek teeth, infolded
What is the ratio of peripheral enamel length to tooth perimeter in mandibular cheek teeth? 1.87
What is the ratio of peripheral enamel length to tooth perimeter in maxillary cheek teeth? 1.48
What structures exist on the maxillary cheek teeth to make up for less peripheral enamel infolding? infundibulae
What is senile excavation? infundibula can wear out (often in the 09 or 10) causing the adjacent unsupported primary and secondary dentine to wear very fast and the tooth to become hollow
What happens to the degree of infolding present on the periphery of teeth more apically? age less enamel infolding near apices
Which type of dentin is most porous? secondary
Where is irregular secondary dentin deposited? laid down subocclusally in order to prevent exposure of the pulps caused by dental attrition
Where is regular secondary dentin deposited? onto the inner dentinal walls by the odontoblasts that cover the pulp tissue
What are 2 types of tertiary dentin? repairative reactionary
How many pulp horns do incisors, canines and PM1 have? one
How many pulp horns do the 07, 08, 09, & 10s have? 5
How many pulp horns do the 06's have? six
How many pulp horns do the mandibular 11's have? seven
How many pulp horns do the maxillary 11's have? eight
What is the average thickness of subocclusal secondary dentin? 1 cm
What is the variability/range of thickness of subocclusal secondary dentin? 2 mm to 33 mm
What is the variation in the distance between the pulp and the mesial or distal tooth margin? 1.3 to 10.8 mm
at which margin (mesial vs. distal) is the dentin thickness between the interproximal space and pulp tissue usually greater? mesial
What is is the main driver for deposition of subocclusal secondary dentine? occlusal stimulation
What type of dental tissue comprises the primary occlusal surface of newly erupted teeth? cementum
What type of feed do horses eat faster (i.e. more chews per minute)? grass 100-105 chews/minute hay 58-66 chews/minute
At what age do the deciduous 01's erupt? during the first week of life
At what age do the deciduous 02's erupt? 4-6 weeks
At what age do the deciduous 03's erupt? 6-9 months
At what age do the canine teeth erupt? 4-6 years
At what age do the '05s erupt? ~ 1 year
At what age are the deciduous 06's shed? ~2.5 years
At what age do the 09's erupt? 1 year
At what age do the 10's erupt? 2 years
At what age do the 11's erupt? 3-4 years
What is the average rate of eruption of horse teeth? 2-3 mm/year
How many roots to maxillary cheek teeth have? 3
How many roots to mandibular cheek teeth have? 2
How many roots do the mandibular 11's have? 3
What is the width of the maxillary arcades relative to the mandibular arcades? ~23% wider on avg
Created by: Louise Marron Louise Marron on 2012-04-05



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