Flashcards
OCB02-1020-Structure and function of periodontal ligament
Cards in this deck (13)
- 1What is the Periodontal Ligament?Specialised dense fibrous tissue attaching tooth to alveolar bone
- 2What is the PDL located in between?Bone and cementum
- 3What is inside the connective tissue of the PDL? (4)1. Fibroblasts for producing/degrading tissue
2. Osteoblasts/cementoblasts
3. Epithelial cell rests of Mallasez
- remains of HERS
4. Blood vessels/nerves/lymphatics - 4What is the composition of the connective tissue matrix?65% Type 1 Collagen (ties root to bone)
20% Type 3 Collagen
5% Type 4 Collagen - 5What are the 5 types of Principle Fibers (type 1) that tie the root to the bone?1. Oblique Fibers (majority, from bone to cementum)
2. Apical FIbers (at apex)
3. Horizontal fibers (at coronal)
4. Crestal Fibers (at crest)
5. Sharpey's Fibers (extend into cementum/alveolar bone) - 6What is the blood supply to the PDL?Anastomosis of:
- apical vessels from inferior/superior ALVEOLAR artery
- vessels in bone matrix
- gingival vessel at top of tooth - 7Where does lymphatic drainage occur?The apex of the tooth
- 8When does the PDL form? When does it achieve its final structure?After HERS breaks down and induces cementum formation
After tooth eruption - 9What cells is the PDL derived from?Mesenchyme cells in the dental follicle
- 10What is ankylosis?Fusion of tooth to jaw in the absence of the PDL
- 11What are the 4 functions of the PDL?1. Neuromuscular (pain fibers/mechanoreceptors)
2. Retention of tooth
3. Absorption of occlusal forces (proteoglycans+collagen fibres make it elastic)
4. Tooth eruption - 12How does biting change the PDL?It influences the PDL width, structure, and degree of tooth motility
- 13What are 2 clinical issues assosiated with the PDL?1. Periodontal disease is chronic inflammation leading to loose/loss of teeth
2. PDL remodels in response to orthodontic tooth movement
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- Description
- LOs are to: Describe in a detailed overview the anatomical structure of the periodontal ligament, Including the: fibrous, cellular, ground substance components of this specialised connective tissue. Understand the functions of the periodontal ligament during tooth support, eruption and mastication.
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- Evian Chai
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