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DEN110- tooth dev.
| Question | Answer |
|---|---|
| Odontogenesis: | tooth development, 5-6 weeks in utero |
| Tooth development stages: | Initiation, bud, cap, bell, apposition, maturation, attrition |
| Initiation stage: | development begins with cell migration from oral epithelium into jaws, form the dental lamina |
| Dental lamina: | narrow band of ectoderm that is responsible for formation of tooth |
| Functions of dental lamina: | 1. formation of primary den. 2. formation of succedaneous teeth 3. formation of tooth germs of perm. teeth |
| Early stages of tooth development: | bud, cap, bell |
| Bud stage: | development of rounded and localized growth of tooth bud (enamel organ), 10 in each jaw |
| Cap stage: | developing tooth bud has concave/cap like shape, specialization begins |
| Bell stage: | changes shape, resembles a bell, size increases, cell layers form |
| Cell layers of bell stage: | outer enamel epithelium (OEE), inner enamal epithelium (IEE), stratum intermedium (SI), stellate reticulum (SR) |
| Cells of IEE cell layers develop into: | ameloblasts |
| Dental papillae: | area within developing tooth bud that forms the dentin and pulp, odontoblasts are formed |
| Apposition stage: | hard tissues of crown are made, detatches from lamina, developmental issues occur, lobes fuse together to form crown |
| Dentinogenesis: | dentin formation, first mineralized tissue to appear |
| Odontoblast: | forming dentin |
| 2 phases of dentinogenesis: | predentin, addition of hydroxyapatite, mineralization occurs, dentin |
| Lines of increments in dentinogenesis are called: | Lines of Von Ebner |
| Amelogenesis: | enamel formation, first enamel put down establishes DEJ |
| Ameloblast: | cell responsible forming enamel |
| 2 phases of amelogenesis: | amelogenin, addition of hydroxyapatite, mineralization, enamel |
| Lines of increment in amelogenesis are called: | Lines of Retzius |
| Maturation stage: | mineralization of added salts/minerals occur, harden to allow eruption to occur |
| Cells at the cervical area lengthen and form double layer called: | Hertwig's epithelial root sheath |
| What two things come into play when looking at root formation? | 1. cells of hertwig's ERS 2. space available |
| Cementogenesis: | cementum formation |
| Cementoblasts: | cell responsible for forming cementum |
| 2 phases of cementogenesis: | cementoid, addition of hydroxyapatite, mineralization, cementum |
| Exfoliation: | loss of primary tooth, due to increased pressure from developing permanent tooth. |
| Primary eruption sequence: | CI, LI, 1st molars, C, 2nd molars |
| Permanent eruption sequence: | 1st molars, CI, LI, 1st premolars, C, 2nd premolars, 2nd molars |
| Attrition stage: | wearing away of tooth structure as person ages, diet related |
| When do primary CI erupt? | 6-8 m. |
| When do primary LI erupt? | 9-10 m. |
| When do primary canines erupt? | 16 m. |
| When do primary first molars erupt? | 13 m. |
| When do primary second molars erupt? | 23 m. |
| When do perm. CI and LI erupt? | 6-7 yrs., 7-8yrs. |
| When do perm. canines erupt? | 9-11yrs |
| When do perm. first and second premolars erupt? | 10-11yrs. |
| When do permanent first, second, and third molars erupt? | 6 yrs, 12 yrs, 17+ yrs. |
Created by:
madelineyork
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