PDL Flashcards
What does the PDL link
links cementum to alveolar bone to root
Blood supply of PDL
apical vessels
alveolar bone
gingival vessels
What are the 2 receptors in PDL and what do they record
nociceptors
mechanoreceptors
pain, touch + pressure
Most essential fibers in the PDL
Collagen type I, II and V
What fibers extend through the PDL
Principal fibers
What fibers are at the end of the PDL
Sharpey fibers
What does proteoglycans do
‘glue’ hold the tissue together
Connective tissue matrix (Principal Fibers) are divided into 4 groups
- Alveolar crest fibers (ACF)
- Horizontal fibers (HF)
- Oblique fibers (OF) MOST PRESENT
- Apical fibers (AF)
What do Sharpey fibers link the PDL to
connecting cementum to alveolar bone
What type of joint is the PDL
gomphosis (fibrous)
3 functions of PDL
Adsorption of occlusal forces
Neuromuscular
Remodelling
What does the PDL grow with
as tooth erupts and root grows
As …….. grows ……. towards the ……. the PDL is being formed
HERS
downwards
apex
What is the PDL derived from
dental follicle
Clinically what is PDL important for
mobility
occlusal loading
orthodontics
periodontal disease
The PDL can undergo adaptive changes in mobility in response to changes in:
damage to PDL
Thickness of overlaying bone (thin less support, thick more support)
if bone is lost tooth drifts
Mobility due to overloading causes the PDL:
(high contact point)
Overeruption reduces overloading causes the PDL:
Thicker + bone resorption
PDL decreases, narrower PDL
In orthodontics what occurs
orthodontic force
bone remodelling of the PDL + alveolar bone
new PDL is formed
What occurs in the PDL in periodontitis
lost and cannot regrow
