72030
Description
Flashcards by Jeni Thomas, updated more than 1 year ago
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Created by Jeni Thomas
over 11 years ago
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| Question | Answer |
| Odontoblast layer of pulp: | |
| What is meant by the cell poor zone immediately underneath the odontoblast layer? | Traversed by capillaries, nerve fibers and fibroblast processes. Relatively cell free. |
| What is the cell rich zone? | Contains fibroblasts, macrophages and lymphocytes. |
| What is the pulp proper? | Central mass of the pulp containing nerves, blood vessels and connective tissue cells. |
| Describe innervation to the pulp? | Fibers; Afferent (conduct sensory impulses) Autonomic (regulate microcirculation) Sympathetic (help modulate blood flow) |
| What are the afferent fibres? | Aδ fibres (low threshold, respond to transient pain) C fibres (stimulation causes burning, aching pain - indicate more pronounced inflammation) |
| What stimulates the nerves? | Fluid movement in the dentinal tubules |
| What can movement of fluid be caused by? | thermal, chemical and mechanical stimuli - resulting in nerve excitation and pain |
| What will nerve excitation cause? (steps of acute inflammatory response) | Release of neuropeptides (substance P and CGRP). These cause arteriole dilation and increased capillary permeability. Increased vol. and pressure of interstitial fluid and rate of outward fluid flow into tubules. This is to avoid any inward diffusion of toxins to the pulp. |
| What is periodontium? | Part which surrounds the root apex. (root cementum, periodontal ligament, alveolar bone) |
| Causes of pulpitis? | Microbial (caries, exposed dentine, periodontal disease) Trauma Iatrogenic factors (marginal leakage, restoration, orthodontic treatment) Systemic (nutritional deficiency, tumour) |
| Steps of endodontic treatment? | - Diagnosis - Isolation - Access - Cleaning and Shaping - Obturation - Coronal Seal - Restoration |
| Different types of pulp protective materials? | - Bases - Liners - Sealers - Varnishes (not good) - Dentine adhesives |
| What does the dental pulp provide nourishment for? | odontoblasts which line its surface |
| What is primary dentine? | formed by odontoblasts during development of the tooth |
| What is secondary dentine? | deposited throughout the life of the tooth |
| What is tertiary dentine? | laid down in areas of wear or dental disease |
| What do the dentine tubules contain? | - odontoblast processes - afferent nerve terminals - processes of the immunocompetent cells - fluid from pulpal extracellular fluid |
| Layers of the dental pulp? | Odontoblast layer (outermost) Cell poor zone Cell rich zone Pulp proper (innermost) |
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