12- Histomorphology of dental pulp Flashcards

1
Q

Dental pulp

A
  • Derived from mesenchyme + ectomesenchyme of dental epithelium
  • Formed from dental papilla courtesy to odontoblasts during late bell stage

Pulp histogenesis

  • Begins in the bud stage
  • Ends when root formation is completed
  • Throughout this period pulp is in embryonic stage
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2
Q

Stages of formation of pulp

A

Follows the morphological stages of tooth development

Bud stage ⇢ Cap stage ⇢ Early + Late Bell stage

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3
Q

Bud stage

A
  • Dental lamina grows + thickens to form bud
  • Cells of ectomesenchyme proliferate + condense to form dental papilla
  • Tooth forming potential is transferred from dental epithelium ⇢ dental papilla
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4
Q

Cap stage

A
  • Tooth bud looks like a cap surrounding dental papilla
  • Mesenchyme cells ⇢ form Dental follicle
  • Enamel knot influences shape of crown + development of dental papilla
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5
Q

Early bell stage

A
  • Exchange of molecular information between enamel organ + dental papilla
  • Results in cell differentiation during late bell stage
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6
Q

Late bell stage

A
  • Most peripheral cells of dental papilla enlarge
  • These become tooth’s epithelial-mesenchymal interface ⇢ Odontoblasts
  • Odontoblasts ⇢ Synthesis + secretion of dentin matrix
  • At this stage dental papilla = dental pulp
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7
Q

Vascularisation of pulp

A

Starts during the 2 bell stages

  • small branches of principal vascular trunk of jaw ⇢ enter base papilla
  • Main vessels enlarge + run through pulptowards cuspal region
  • Here they give off several branches ⇢ forming bed of venules, arterioles, capillaries
  • These are located in subodontoblastic + odontoblastic regions
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