Dental Anatomy & Physiology Flashcards
Position of the incisors, canines, premolars and molars
PM2s: angled caudally
PM3, PM4 and M1 perpendicular
M2 and M3: angled mesially
6 cheek teeth: arcade (PM2-4, M1-3)
Hypsodont
Incisors and cheek teeth
High (or long)- crowned
Continue to erupt
Diphyodont
Incisors, K9s
2 sets of teeth: deciduous and permanent
Brachydont
K9s and wolf teeth
Low (short) crowned
Limited growth
Wolf teeth
1st premolar (brachydont)- not cheek!!
Vestiges and lower one seldom present
What tissues the teeth composed of?
Cementum
Enamel
Dentin
Pulp
What is the pulp comprised of?
Composed of nerves, arteries, veins, lymph vessels, intercellular matrix, fibroblasts and collagen
Pulp chambers
Incisors and K9s: simple cone with a single root
Mandibular and max cheek teeth: complex chamber
What substance is produced by pulp ondontoblasts?
Dentin, cream-colored
Occlusal surface is dark because it absorbs pigment from feed
What is the purpose of continued dentin production?
Prevents abrasion from exposing pulp
Reduces size of pulp chamber as horse ages
Enamel
Hardest substance in body produced by ameloblasts
Cannot be reformed after damage
Infundibula
Vertical marginations of enamel into dentin of hypsodont teeth (incisors, central enamel)
Filled with cementum
Cementum
Covers external enamel and fill central enamel
Produced by cementoblasts
Provides support for enamel
Do deciduous teeth have cementum?
NO
Help differentiate from permanent teeth: yellow (white= deciduous)
When teeth erupt, what is the occlusal surface covered by?
Cementum and enamel → rapidly worn away to expose the dentin
