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10 Cards in this Set
- Front
- Back
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What tooth anatomy is different on a deciduous and permanent?
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crown morphology
contact areas enamel structure pulp and root morphology |
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explain the crown morphology on a deciduous
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crown smaller
crown more bulbous Li and B surfaces converge occlusally- narrower O table wider M-D than O-G greater cervical constriction and more prominent cervical enamel contour |
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explain contact areas on a deciduous
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broader
flatter more gingivally placed |
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explain enamel structure on a deciduous
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thinner
rods have a different angulation- in gingival third crown tend to have a O orientation |
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explain pulp and root morphology in deciduous
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coronal pulp proportionally larger
pulp horns more prominent- especially MB pulp horns closer to surface thin pulpal floor accessory canals roots proportionally longer flatter M-D more splayed and curved |
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explain pulp in upper molars
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4 main pulp horns- corresponding with cusps, 3 for 3 cusp version of upper first deciduous molar
3 main pulp canals- corresponding with roots variable 2-4 |
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explain pulp in lower molars
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4 main pulp horns- corresponds with cusp - may be a small D pulp horn in lower second deciduous
often 3 pulp canals- MB and ML and D but variable 2-4 |
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what are some cavity design consideration?
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reduce B-L dimensions
depth- just into dentine, pulpal floor .5mm into dentin and 1.5mm from surface small pear bur- #330 bur to guide depth |
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considerations for proximal restorations
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B-L contacts barely broken
axial wall .5mm into dentin restrict pulpal encroachment of axial wall- M surface to pulp lower 1st molar may be only 1.6mm care with retentive grooves isthmus fracture- common area of failure |
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What are some pulpal therapy considerations?
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a fractured marginal ridge my be indicative of a pulp exposure
easy to perforate chamber floor difficult to root treat |
