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12 Cards in this Set
- Front
- Back
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What's a veneer?
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A material that covers the facial surface of teeth for esthetic purposes.
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What actually made esthetic dentistry possible?
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Etching! Using phosphoric acid to etch teeth impoved the bonding in place such that this became a viable option.
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What 's the difference between different type of veneers? Porcelain, acrylic, lumineers?
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Lumineers - same but manufactured by the lumineer lab. As thin as a contact lens, as small as 0.1 mm. Can do feather edge on the tooth.
Composite resin improved so much that we're able to use this for veneers. Less expensive than using porcelain. Overtime it deteriorates. Porcelain - 85-86 popular. Didn't have good ways to do this until bonding improved. Very thin with glaze on one side, etch on the other. Margins may not be great. Margins end up as composite that fills in the gaps. Very thin. Can also be made heavy also. Hydrofluoric acid is the only acid used to etch the porcelain. |
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5 bondable surfaces you can work with ?
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Enamel, dentin, porcelain, metal, and composite using different techniques.
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Direct vs. indirect veneer?
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Direct - done in patients mouth. Composite.
Indirect - through impression taking and lab makes them. Composite and porcelain. 2 ways to fabricate them |
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Why did we not want to prepare teeth initially?
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Reversible procedure, without anesthetic. Simple impression is needed and temporization isn't necessary either.
Tetracycline staining was made reason. Depressed tooth can be built out slightly. However, w/o prep you are making it larger than its supposed to be. |
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Why do we prepare the teeth?
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-Better contours and shape
-Better positive seat incisally and gingival. fit with good gingival margin and stop on incisal edge. -better alignment |
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If veener and margin are the same color, where can the margin be?
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Supragingival. Always easier to do it this way.
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Preparation conventional technique.
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1. LVS 1 bur - with cylinders that give you 3 depth cuts. Guarantee certain removal of tooth structure. Go across the tooth and make depth cuts. Not too close to incisal edge. Bend it in towards gingival margin and then up to ward the inscisal. 0.5 mm deep.
2. LVS 3 diamonds - coarser grit on body than on the tip. Can also use this for depth cuts on insical edge 0.5 mm. |
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How above the gingiva should be?
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1.0 mm above it.
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Insical edge is reduced how?
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Can be done straight across or with half mm with overlap so you can cover the incisal edge of the tooth. Foot ball shaped burr with used with insical ede.
MD edges are over reduced to make room for insertion. -end up with gullwing look. This ensures a thickness of porcelain n these areas. All angles must be rounded or else porcelain will fracture and won't fit properly. |
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Where should our prep end?
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Height of contour of papilla and to contact area. Keep the bur angled from the col to the incisal edge with rounded gull wing appearance.
Don't break contact! End at 90 degrees to cavo surface. Facial margin with full chamfer. |
