DBAS 712- PDL and Alveolar Bone Development

Periodontium

cementum, PDL, alveolar bone, gingival tissue

gingiva develops from

ectoderm of pharyngeal arch

lamina propria develops from

mesoderm

cementum, pdl, and alveolar bone develops from

ecto mesenchymal stems cells of dental sac/follicle

oxytalan fibers

elastic fibers without elastin in their core, in cementum, pdl, and alveolar bone

structural strength of PDL is provided by

principal fibers (collagen I)

what fibers run parallel to cementum and form a network surrounding the root

Oxytalan

complex spatial orientation of ______ is essential for PDL function allowing for 3D support and protection

principal fiber

unlike cementum and dentin, the pdl is _____

vascularized

Fibroblasts in PDL secrete _______ to promote angiogenesis

Vascular endothelial growth factor

Expression of VEGF is controlled by

BMP

PDL fibroblasts derived from ectomesenchymal origin have ________ than fibroblasts derived from mesoderm

higher capacity to undergo renewal and trigger tissue repair

development of PDL begins during

tooth eruption

what is essential for the function of PDL

Anchorage to alveolar bone by Sharpey's fibers

only ______ cementum connects tooth root to PDL

accellular extrinsic fiber

where do Sharpey's are attached and embedded in alveolar bone at sites of

remodeling

in the PDL pre-emergence stage

fibers aligned perpendicular to root emerge from cementum and bone, after one third root has formed

in the PDL preocclusal stage

fibers from cementum and alveolar bone protrude in PDL space

PDL first occlusal contact stage

fibers from cementum, bone, and those made by PDL cells form bridge like fiber bundles

PDL Full occlusal function stage

fiber bundles thicken without central zone

alveolar bone develops by

intramembranous ossification from ectomesenchymal cells of dental follicle

alevolar bone proper

lines socket contains bundle bone

Supporting bone

consists of cortical plates and trabecular bone

alveolar bone develops _______ tooth eruption

in conjunction with

osteogenesis of alveolar bone directed by mix of genes involved in

tooth development and regular bone development