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14 Cards in this Set
- Front
- Back
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Indications for Full Gold Crown Prep
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-Insufficient tooth structure to retain INTRACORONAL resotraiton or aprtial veneer preparation
- significant defective axial tooth structure(extensive caries, defective extensive resotration, ednodontic teeth) -Teeth need reocntouroing -maximum retention needed -fixed removalbe partial denture abutments |
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When are full coverage crowns indicated?
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Large Failing resotrations which undermine and weaken cusps
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Advantages of full gold crown?
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support/reinforce remaining sturcture, easy to make good contours due to working outside of the muth
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Prep Steps
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occlusal clearance
external retention form and finish lines axiliary retenion(for short crown lenght) finishing evels |
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Occlusal clearance:
how many planes paralelleling teeth planes? |
1.5mm
3 |
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What bur to use for occlusal reduciton?
Diameter? grooves? |
57-010
1.0mm parrallel opposing tooth structure |
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Depth of grooves?
place grooves where? |
-1.0mm+
-primary buccal, lingual grooves, triangular ridges |
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functional Cusp Bevel:
reduce how? |
1.5mm lcerance
paralell to opposing tooth structure |
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Axial Reuction and Chamfer
length of walls? tape b/w opposing walls? chamfer depth? finish line? |
-3mm
-6-10 degrees-can see wall looking occlusaly -.3-.7mm -.5mm supraginigval |
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Line of Draw
what is it? |
-imaginary line located at the center of all possible paths of withdrawl or seating of resotration
-drawn b4 prep has begun -essentially which direction you want the crown to come off-->genrelly long axis of tooth |
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Axial Reduction process buccal?
bur angle? bur depth? contour? bur? |
-line bur up with long axis of tooth, move to side w/o chaning angulation and lean up against tooth.
-follow contour of gingiva from mesial to distal. -begin preparing at ginigva -go only 1/2 way in to get the shape -878K-012 |
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Axial reduction at interproximals?
bur? adjacent teeth should be what distance? |
-use 850-012 diamond to do initial.
-want to go below the contact -finishline adjacent should be .5mm |
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Axial Reduction lingual?
initial reduction done where? |
line up with axial wall w/o changing angulation
-middle 1/3 |
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Need buccal seating groove?
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no necessary
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