Term
|
Definition
-Osseous tissue of maxilla + mandible that surrounds and supports the teeth -Partially derived from Dential Follicle -Formed during cementogenisis when additional osteogenesis occurs along surface of bony crypts that partially enclose developing teeth
|
|
|
Term
|
Definition
-The structure composed of alveolar bone is know as the Alveolar Process -Consists of an outer cortical plate, central spongy bone, and bone lining the tooth socket (bundle bone) -Is able to deform slightly to accommodate the biting forces/minor trauma placed upon it -PDL fiber bundles within A bone and cementum are called Sharpey's Fibers
|
|
|
Term
|
Definition
-Bundle Bone is the bone which collagen bundles of PDL insert. -Comes from DENTIAL FOLLICLE -Also known as the Alveolar Bone Proper -Has numerous foramina that transmit nerves and vessels to the PDL, so it is also known as the Cribiform Plate -Radiographically, it is known as the Lamina Dura
|
|
|
Term
|
Definition
-Derived from Dental Follicle -At onset of development, PDL consists of disorganized CT which has protruding collagen fibers from cementum and alveolar bone
-Then PDL fibroblasts synthesize collagen, forming fibrous bridge between cemental and alveolar bone collagen, anchoring tooth into mouth -At eruption, PDL fibers organizie and thicken via fibroblast remodeling
|
|
|
Term
|
Definition
-Supports tooth inside socket -Helps withstand occlusal forces, shoch absorber -Serves as sensory organ -0.15-0.38mm and Thinnest at middle 1/3 of Root - PDL gets thinner with age due to production of secondary dentin |
|
|
Term
|
Definition
1. Fibroblasts 2. Epithelial Cells 3. Undifferentiated Mesenchymal Cells 4. Cementoblasts 5. Osteoblasts 6. Osteoclasts
|
|
|
Term
|
Definition
-Most Common cell of PDL -Very active and continuosly degrading and synthesizing collagen
|
|
|
Term
|
Definition
-Remnants of Hertwig's Rooth Sheath, also known as The epithelial Rests of Malassez -Have no function other than to give people cancer! WOO!
|
|
|
Term
| PDL Undiff. Mesenchymal Cells |
|
Definition
-Tend to cluster around blood vessels -Provide a cellular pool for the recruitment of new fibroblasts, cementoblasts and osteoblasts
|
|
|
Term
|
Definition
-Found within the PDL -Also associated with surface of cementum
|
|
|
Term
|
Definition
-Found within the PDL -Also associated with surface of alveolar bone -Are either actively producing osteoid or resting
|
|
|
Term
|
Definition
-Found in areas where the alveolar bone is undergoing resorption |
|
|
Term
|
Definition
-Fibers are Type I, III and XII -Arranged in bundles with well defined orientation: 1. Alveolar Crest Group 2. Horizontal Group 3. Oblique Group 4. Apical Group 5. Interradicular Group
|
|
|
Term
|
Definition
-Attached to tooth slightly apicla to CEJ -Insert into crest of alveolus
|
|
|
Term
|
Definition
-Found JUST apical to the alveoalr crest group -Fibers oriented at Right Angles to long axis of tooth
|
|
|
Term
|
Definition
-Most Common fiber group in PDL -Largest role in anchoring teeth
-Alveolar bon attachment is coronal to their origination on the cementum /| |\
|
|
|
Term
|
Definition
-Run between the apical cementum directly to the apicla alveolar bone -Resist forces that would pull teeth straight out
|
|
|
Term
|
Definition
-Found in the interradicular/bifurcation regions of multi-rooted teeth
|
|
|
Term
|
Definition
-Mature elastic fibers NOT found in PDL -BUT immature Oxytalan Fibers can sometimes be found -Run vertically along surface of cementum to root apices where they end at vascular/nerve supply -Thought to play a role in lympahtic flow -Most numerous in cervical region of PDL
|
|
|
Term
|
Definition
-PDL ground substances acts as shock absorber against occlusal forces -Mostly Water (70%) and Dermatan Sulfate (glycosaminoglycan)
|
|
|
Term
|
Definition
1. Superior Alveolar Artery - Maxilla 2. Inferior Alveolar Artery - Mandible -Branches run through A bone and enter PDL through Cribiform Plate -The Perforating Arteries are more numerous in posterior teeth and more common in the mandible -Arteries reside between fiber bundles -Arterial blood runs apical to crestal, venous and lymph run the opposite
|
|
|
Term
|
Definition
Has a Dual Nerve Supply: 1. Sympatheitc nerve fibers of ANS that regulate blood flow through PDL (No PNS)
2. Afferent, mostly myelinated, Sensory branches of 2nd and 3rd divisions of Trigeminal Nerve -Fibers enter via apical regions and run to gingival margin or via cribiform plate running up and down PDL
|
|
|
Term
|
Definition
Apical Region contains the greatest # of nerve endings With One Exception: -The upper incisors have nerve endings concentrated in the coronal half of the labial portion fo the PDL -Posterior teeth have the most nerve fibers
|
|
|
Term
4 Types of Nerve Endings in PDL |
|
Definition
1. Free Nerve endings 2. Ruffini-like Corpuscles 3. Coiled Nerve Endings 4. Spindle-like Endings
|
|
|
Term
|
Definition
-Most Common -Serve are Nociceptors and Mechanpreceptors -Found evenly distributed along length of PDL -PAIN!
|
|
|
Term
| PDL Ruffini-like Corpuscles |
|
Definition
-Mechanoreceptors that are found among the PDL fibers |
|
|
Term
|
Definition
-Unknown function -Found in Mid-portion of the PDL |
|
|
Term
|
Definition
-Unkown function -Least common, seen around Root Apex
|
|
|
Term
| Functions of the Periodontium |
|
Definition
Periodontium = Alveolar bone, PDL and cementum complex 1. Attachment - PDL keeps tooth anchored in jaw and helps dampen occlusal forces 2. Sensation - Pain, touch, pressure
|
|
|
