Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
27 Cards in this Set
- Front
- Back
|
avg width of the PDL
|
0.2mm
|
|
|
What occurs to PDL as we age
|
PDL gets narrower
|
|
|
Where can you find the widest location for PDL
|
cornally & apically have the widest PDL
mid-root has the narrowest PDL |
|
|
Where is the narrowest location of PDL
|
mid-root has the narrowest PDL
|
|
|
What occurs to PDL if tooth is non-functional
|
Narrow PDL
|
|
|
What occurs to the PDL if the tooth is hyperfunctional
|
Wider PDL
|
|
|
Where is periodontal disease most like to occur
|
Interproximal embrasure b/t 1st & 2nd molar
This is because it has the largest PDL surface area |
|
|
Where can you find the largest PDL surface area
|
Maxillary Molars
|
|
|
PDL fibers
|
Consists mainly of
Collagen Types I and III with minor amounts of other proteins like Collagen Type XII |
|
|
Principle Fibers
|
functions to support the tooth within the alveolus
appear from a coronal to apical direction in development Types Alveolar Crest Horizontal Oblique Apical Interradicular |
|
|
What is the main group of Principle fibers that gives the most support
|
Oblique fibers
|
|
|
Gingival Fibers
|
form the biologic seal of soft tissues against the tooth to protect from bacterial egress
Types Dentogingival Dentoperiosteal Alveolargingiva Circular Transepta |
|
|
Dentogingival Fibers
|
radiates coronally from tooth to gingiva
|
|
|
Dentoperiosteal Fibers
|
radiates apically from tooth to over the alveolar crest
|
|
|
Alveolargingiva Fibers
|
radiates coronally from bone to gingiva
|
|
|
Circular Fibers
|
wraps circumferentially around the neck of the tooth
|
|
|
Transeptal Fibers
|
extends across 2 adjacent teeth over the alveolar crest
|
|
|
What fibers are cut to prevent retrodrift memory of newly moved teeth in ortho treatment
|
Transeptal
|
|
|
Biologic width
|
2.0mm
width of sound tooth structures required for the insertion of the gingival fibers + Junctional Epithelium biologic width = 0.5mm of junctional epithelium + 1.5mm of gingival fibers |
|
|
What is the vascular supply to PDL
|
apically, via the dental artery
laterally, via the fenestrations in the periosteum coronally, via the gingival vasculature |
|
|
fibroblasts
|
synthesizing & remodeling the PDL fibers
|
|
|
Rests of Malassez
|
derived from HERS
imple epithelia expressing cytokeratins C18 and C19 (Amelogenin-related proteins) mitotic in response to wounding or inflammatory mediators may play a role in periodontal regeneration |
|
|
undifferentiated mesenchymal cells
|
capable of regenerating the components of the periodontal attachment
|
|
|
Conventional flap surgery
|
gingival epithelium proliferates and migrates the fastest
Results in long junctional epithelium attachment where gingival epithelium attaches to previously exposed root surface **No regeneration of Cementum, PDL or alveolar bone |
|
|
long junctional epithelium
|
gingival epithelium attaches to
previously exposed root surface because it proliferates and migrates the fastest during conventional flap surgery |
|
|
Guided tissue regeneration
|
Uses surgical barriers like Gor-tex membrane to prevent epithelial cell migration
**You get regeneration of cellular cementum, PDL and alveolar bone **Problem - no attachment to root surface **Need Amelogenin for Acellular cementum to be developed and create attachment to root |
|
|
Do you need native root surface to PDL regeneration?
|
No
Cementum can deposit onto titanium |
