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Description
Flashcards by Evian Chai, updated more than 1 year ago
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Created by Evian Chai
about 4 years ago
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| Question | Answer |
| What is the Periodontal Ligament? | Specialised dense fibrous tissue attaching tooth to alveolar bone |
| What is the PDL located in between? | Bone and cementum |
| What 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 |
| What is the composition of the connective tissue matrix? | 65% Type 1 Collagen (ties root to bone) 20% Type 3 Collagen 5% Type 4 Collagen |
| What 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) |
| What 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 |
| Where does lymphatic drainage occur? | The apex of the tooth |
| When does the PDL form? When does it achieve its final structure? | After HERS breaks down and induces cementum formation After tooth eruption |
| What cells is the PDL derived from? | Mesenchyme cells in the dental follicle |
| What is ankylosis? | Fusion of tooth to jaw in the absence of the PDL |
| What 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 |
| How does biting change the PDL? | It influences the PDL width, structure, and degree of tooth motility |
| What 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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