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The PDL is
a fibrous connective tissue between the alveolar bone & cementum TERM 2
Functions of the PDL
DEFINITION 2 Supportive, Sensory, Nutritive, Maintenance & repair TERM 3
Supportive function
DEFINITION 3 attaches the tooth to the alveolar bone via (Sharpeys fibers); TERM 4
Many Sharpey's fibers have a _ pattern at
rest, but become _ when force is applied to
the tooth to, provide resistance to the
occlusal force
DEFINITION 4 wavy; straight TERM 5
sensory function
DEFINITION 5 The PDL contains numerous neural receptors Tactile, proprioceptive, and pain receptors can be seen
Nutritive function
Blood vessels in the PDL supply nutrients to the PDL, associated cells, & the bone & cementum TERM 7
Maintenance & repair
function
DEFINITION 7 Fibroblasts & undifferentiated mesenchymal cells of the PDL form cells which are active in resorption & deposition of bone & cementum to help maintain normal occlusal* relationships as teeth migrate during their lifetime TERM 8
The PDL is composed
of
DEFINITION 8 fibers, cells & intercellular substance TERM 9
PDL blood supply
DEFINITION 9 It has a plexus of vessels made up of apical vessels, interdental alveolar vessels, & vessels from the gingival connective tissue This extensive blood supply gives the PDL an ability to renew & heal itself quickly* TERM 10
Nerve supply to the PDL is via _ nerves as
they progress to the _ _
DEFINITION 10 apical; gingival tissues
interstitial spaces
contains blood vessels, nerves, lymphatics & finer fibers is found between each group of fiber bundles; form a network around the root that interconnect in both horizontal & longitudinal directions TERM 17
The principal fibers surround interstitial
spaces & the combination of the fibers &
spaces provide _ _ effect to the PDL
DEFINITION 17 shock absorber TERM 18
Fine, elastic fibers (_) help support blood
vessels & collagen bundles
DEFINITION 18 oxytalan TERM 19
fiber bundles that support the
gingiva
DEFINITION 19 The gingival fiber group TERM 20
The gingival fiber group is composed
of
DEFINITION 20 Free gingival fibers, Attached gingival fibers, Circular, or circumferential fibers, Transseptal fibers
groups of fiber bundles that can be identified
in the gingiva
Dentogingival fibers, Alveologingival fibers, Dentoperiosteal fibers, Circular fibers, Transseptal fibers TERM 22
Dentogingival fibers
DEFINITION 22 run from the cervical cementum to the free & attached gingivaresist gingival displacement TERM 23
Alveologingival fibers
DEFINITION 23 run from the alveolar crest to the free & attached gingivaresist gingival displacement TERM 24
Dentoperiosteal fibers
DEFINITION 24 run from the cervical cementum to the alveolar crest protect the PDL TERM 25
Circular fibers
DEFINITION 25 are continuous around the tooth adjacent to the CEJ area of the toothresist gingival displacement
Oblique fibers
run from cementum upward to the alveolusresist vertical or intrusive forces TERM 32
Apical fibers
DEFINITION 32 run perpendicularly from the apex to the boneresist vertical & extrusive forces TERM 33
Interradicular fibers
DEFINITION 33 run perpendicularly from furca area to boneresist vertical & lateral forces TERM 34
the most numerous cell in the PDL
DEFINITION 34 fibroblasts, because of the large amount of collagen in this tissue TERM 35
fibroblasts are responsible for
DEFINITION 35 formation of collagen fibers, & in some instances may also break down old collagen fibers
Old collagen fibers are broken down into
amino acids & these are recycled to form new collagen fibers TERM 37
Osteoclasts & osteoblasts are also present in
the PDL & are responsible
DEFINITION 37 bone remodeling TERM 38
Osteoclasts are formed from
DEFINITION 38 blood monocytes that migrate to an area of osseous damage TERM 39
Osteoblasts are formed from
DEFINITION 39 mesenchymal cells & are responsible for bone formation TERM 40
As bone is laid down osteoblasts become
DEFINITION 40 embedded in bone & new osteoblasts form from surrounding connective tissue
epithelial rests of Malassez
are thought to be the remnants of the root sheath, but may also continue to form from epithelial cells in the gingival crevice TERM 47
surrounds & protects the cells of the
PDL
DEFINITION 47 Intercellular substance TERM 48
Intercellular substance
DEFINITION 48 This material is produced by the cells themselves & is made up of water, glycoproteins, & proteoglycans. Provides nutrients to cells from the blood & transfers waste products back to the blood system
