lecture 2 Flashcards
characteristic cells of pulp
odontoblasts
most common/prevalent cell type in pulp
fibroblasts
steps of tooth formation
- dental lamina
- bud
- cap (dental pulp originates)
- bell
cell is unique to the pulp and responsible for dentinogenesis
odontoblast
odontoblast produces _____ and proteoglycan matrix which becomes mineralized aka _______. processes extend into tubules
collagen fiber
becomes pre-dentin
secreted before root formation:
secreted after root formation:
before: primary dentin
after: secondary dentin [throughout life]
fibroblast arises from
undifferentiated ectomesenchymal cell
what cell is important for pulp regeneration which elaborates type I and III collagen fibers and ground substances
fibroblast
wound healing forms:
tertiary dentin [layered pulpally by fibroblasts]
two primary functions of pulp function:
- induction
- formative
three secondary functions of pulp function:
- protection
- defense and repair
- nutrition
principle sensory innervation of pulp of Max and Mand Pulp
trigeminal nerve V2 and V3
additional premolar innervation may come from
mylohyoid nerve
what is the sympathetic (motor) innervation for pulp
T1 and T2 via superior ganglion
relatively low stimulation threshold, quicker response.
sharp, pricking
a fibers: Myelinated
THINK ACUTE
relatively high stimulation threshold, slow in onset (late).
dull, aching, and more diffuse less bearable pain
c fibers: Unmyelinated
chronic
irreversible pulpitis
90% of a fibers are:
and largest a fibers are:
90% a delta fibers
largest a alpha fibers
anything that causes movement of the fluid with in the dentinal tubules causes pain in the pulp
Branstromm’s Hydrodynamic Theory
common etiologies of pulp irritation:
microbiological, mechanical, chemical, trauma
“portals of access” of microbiological irritants examples are:
-cracked or fractured tooth
-cemental defect at CEJ
-open dental tubules
-perio invasion into apex
-pulpal invasion in PA
-lateral or accessory canals
the #1 threat to health of the dental pulp is
dental caries
pulp polyp; when pulp grows out of tooth; doesn’t hurt and can’t heal.
hyperplastic pulpitis
cutting with insufficient coolant causes:
aspiration of odontoblasts into tubules
[always use water]
excessive air drying of exposed dentin:
aspiration
application of desiccants:
alcohol, chloroform, cavit, etc
application of any irritating or toxic element to the pulp or dentinal tubules may cause pulpal injury:
direct pulp cap or indirect pulp cap
disinfecting agents
acidic preparations
composites
combo of secondary and tertiary dentin formation in response to extensive and chronic injuries before the pulp became necrotic
calcific metamorphosis
function of ondontoblasts is to create
tooth structure
