Dental Anatomy module IV
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Created by:
daddysgirl7 on October 9, 2010
Classes:
TCC Dental Hygiene (Class of 2012)
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23 terms
Terms | Definitions |
|---|---|
 What is derived from mesoderm? | dentin, pulp, cementum, peridontal ligament, some aveolar bone |
| Enamel organ | enamel-derived from Ectoderm |
| Dental papilla | mesoderm cells which form the dentin and pulp |
| Dental Sac | mesoderm cells which forms cementum, periodontal ligament, and alveolar bone |
| Dental lamina | -1st sign of tooth formation -stratified squamous epithelium thickens into underlying connective tissue |
| Enamel organ | -part of Dental lamina that forms enamel -derived from ectoderm |
| Enamel organ goes through 3 stages | bud, cap, bell |
| Bud | inital budding from dental lamina at 10 thickened areas in each arch |
| Cap | -root formation=6 weeks -deepedy parts of buds become slightly concave the |
| Bell | -the concavity of the cap grows ***-Stratum Intermedium layer appears |
| Successional lamina | -extends off dental lamina for perm tooth development -Goes through bud, cap, bell stage -perminant teeth that follow primary teeth |
| Primate space | -for secondary teeth -found mesial to Max. primary canines -found distal to mand. canines -ALL primates have this space |
| Leeway space | -the difference between the space that deciduous(primary) molars -larger in size -take up a lot of space so when perminent replacements, which are smaller, have pleny of room when they erupt |
| Mesial drift | molars continuing to move mesially (forward) after eruption Has 2 effects: -spaces b/w primary teeth are closed as the perm. 1st molars push primary molard together -if primary teeth lost early or interproximal decay is present and is not restored, the perm. molar will move mesially and fill that space |
| Characteristics of Primary teeth | -Constricted occlusal table -Short root trunks -Roots flare apically -Large pulp chambers -Enamel thin and consistent depth |
| Primary Occlusion | -Flush terminal plane -Distal step -Mesial step |
| Flush terminal plane | distal surfaces of Primary 2nd molars are even w/ each other |
| Distal step | -the mand. molars are more distal than max. molars -Angles class II |
| Mesial step | -the mand. molars are more mesial than max. molars -Angles class III -majority of children |
| Eruption dates primary teeth | Mand 1st molar-> 6-7yrs (Nonsuccedaneous) Max. 1st molar-> (Nonsuccedaneous) Mand central-> 7-8yrs Max central Mand lateral 8-9yrs Max lateral Mand canine-> 9-10yrs Mand 1st premolar-> 10-12yrs Max 1st premolar Max 2nd premolar Max canine->11-12yrs Mand 2nd premolar Mand 2nd molar-> 12-13yrs (Nonsuccedaneous) Max 2nd molar-> (Nonsuccedaneous) Mand 3rd molar-> 17-22yrs-> (Nonsuccedaneous) Max 3rd molar-> (Nonsuccedaneous) |
| Nonsuccedaneous | perm teeth that does NOT replace deciduous teeth Ex: perm molar, Max 2nd premolar |
| Succedaneous | perm teeth that take the place of deciduous teeth |
| Mand canine | comes in 3 yrs later than max canines |
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