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23 Cards in this Set
- Front
- Back
What forms the ERS? |
when IEE and OEE come together
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briefly say 3 things ERS does...ie how does it develop the root? |
1) ERS forms outline of root |
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3 things that outer FOLLICLE FORMS (think to the left of the tooth) |
1) cementoblasts form cement |
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where does formation shift as the root forms downwards? |
it shifts from the ERS to the follicle (i.e. root develops, then the cement, then the PL beside it, then the bone) |
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what side is the hyaline layer on? what does it contain? what does it not contain? |
on odontoblast side... contains collagen/organic layer, |
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briefly outline how collagen is laid down? i.e. orientation from fibroblasts, first layer layer down, etc |
first collagen laid down by odontoblasts, then cementoblasts lay down intrinsic parallel fibbers, then collagen fibers lay down extrinsic perpendicular fibbers (FIBROUS FRINGE) |
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what kind of union is there b/w cement and dentin, why? |
seamless union, ATTEMPT TO PROTECT ROOT! |
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UNMINERALIZED AREA OF DENTIN? |
HYALINE LAYER |
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second layer after acelluar intrinsic layer of cement? |
acellular extrinsic cement...all perp to root (stretches the whole length from cement to alveolar bone) |
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how does orientation of the fibbrs change? |
from a unidirectional orientation to a multidirectional orientation --> gives strength in all directions |
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what specific cell does cellular cement have and where is cellular cement? |
has cementoCYTES, at apical part |
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what happens to the enamel organ during all of this? |
it collapses to form the reduced enamel epithelium |
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what happens above the reduced enamel epithelium? |
modified OEE cells dissolve away bone and tissue (i.e. collagen) along the eruption pathway. |
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when does the tooth erupt? |
when the reduced enamel epithelium fuses with the oral epithelium |
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when are all the ameloblasts dead? |
eruption marks the end of most ameloblasts |
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complications with new teeth? |
a primary tooth must be pulled without damaging the secondary tooth |
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canal forming above a developing tooth is called? |
gubernacular canal...thought to have collagen fibers puling it up |
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what happens to the old root of teeth being replaced |
osteclasts take bite out of it called Howship's lacunae |
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at what stage are both teeth present and changing called? |
mixed dentition stage |
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which parts of teeth are causing forces by formation? |
formation= GPR- growth of pulp (pressure) and root |
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what is required for a tooth to erupt? most recent model... |
NEED FOLLICLE AND BONE DEVELOPMENT/remodelling |
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HOW DO YOU GET MULTIPLE ROOTS? |
the ERS furcates/branches. number of roots matches number of cusps? |
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to clarify, what happens above reduced enamel epithelium during eruption? |
1) modifiedOEE dissolve collagen and fibroblasts |