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15 Cards in this Set
- Front
- Back
What should the depth of a class V be?
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just into dentine 1mm-1.25 due to thinner enamel toward cervical
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What do you need to be mindful of in a Class V?
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pulp as can be closer to the surface
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What is the general shape of the gingival margin?
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usually curved following gingival tissue margin
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What angulation should you have when preparing a class V?
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perpendicular to the surface, slight changes to the orientation of the hand piece because of convexity of surface
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Where is caries removed from?
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DEJ
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What are retentive features in a Class V?
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all walls slightly divergent
locks or grooves placed |
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Where are the grooves placed?
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45* angles toward occlusal or gingival walls, not directly in either wall (assuming just inside DEJ)
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Where do grooves need to be?
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in dentine
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What won't composite bond to?
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dentine, so could get leakage due to crevicular fluid as there is less enamel
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If doing a comp on a Class V what do you need to do to cavo surface?
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bevel
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Why do you bevel?
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allows etch to open up enamel rods to get micromechanical locking,
bevel only enamel margins |
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For a comp class V when might you need to use locks and grooves?
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large preps of the gingival wall on cementum
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should you clean tooth before doing rest if close to gingival margin?
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best to clean and get OH under control so less bleeding
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What is polymerisation?
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shrinking of comp resin
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Why do you restore abrasion?
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so that it doesn't get to pulp
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