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DEN110- E, D, cemen.
| Question | Answer |
|---|---|
| Location of enamel: | protective coating on entire surface of clinical crown, thicker at incisal/occlusal edge |
| Physical characteristics of enamel: | hardest calcified tissue in body, high mineral content |
| Composition of enamel: | 96% inorganic: hydroxyapatite 4% organic: enamelin, water |
| Enamel is made of: | key hole shaped rods |
| Each rod in enamel is filled with: | hydroxyapatite crystals |
| Lines of retzius: | line in enamel which marks incremental deposit |
| Enamel repair: | cannot self repair, no cells, no circulation |
| Hypocalcification: | appear white; insufficient growth of enamel crystals, may decay more rapidly |
| Location of dentin: | under enamel and cementum; found in crown and root |
| 3 distinct areas of dentin: | 1. dentinal tubule 2. peritubular dentin 3. intertubular dentin |
| Physical characteristics of dentin: | yellow in color, mineralized |
| Composition of dentin: | 70% inorganic: hydroxyapatite 20% organic: collagen, protein 10% water |
| Dentin is a tissue and will contain: | cells, collagen fibers, proteins |
| Odontoblasts are located within: | a tubule |
| 3 types of dentin: | primary, secondary, tertiary/reparative |
| Primary dentin: | majority of dentin in crown and root, have tubules, various layers |
| Secondary dentin: | internal to primary dentin, adjacent to pulp |
| Tertiary dentin: | formed in response to disease or trauma to pulp, few or no tubules |
| Location of cementum: | thin layer of mineralized tissue, covers entire root surface, covers dentin |
| Function of cementum: | protection of dentin, attachment apparatus |
| 3 cementum and enamel relationships: | 60%, 30%, 10% |
| Composition of cementum: | 50% inorganic: hydroxyapatitie, flouride 50% organic: collagen and protein, water |
| 2 types of cementum: | acellular, cellular |
| Acellular cementum: | very calcified, CEJ to apical one third, does not increase |
| Cellular cementum: | covers apical one third, deposited throughout life of tooth |
| Cementum repair: | can self repair, has cells, function is limited |
| Cementicles: | small, abnormal calcifications within PDL, result of cellular debris |
| Hypercementosis: | abnormalized thickening of cementum, apical one third of root |
Created by:
madelineyork
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