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Shade Selection
Recommended Shade Guides: Vita Lumin or Vita 3D-Master Shade Guide.
General Considerations:
- Use a chamfer margin
around the gingival margins. Margins that extend to the occlusal or
incisal must be 90º or butt joint.
- Avoid sharp angles.
- Maintain an even
reduction of anatomical form.
- These are minimum
reductions. Strength and opacity will be increased with more tooth reduction.
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INLAY
PREPARATION
- Observe antagonistic
contacts. Avoid margin in contact areas.
- The preparation
depth should be approximately 1.5 mm in the fissure area. The
isthmus width should be 1.0 mm to 1.5 mm. The gingival floor should
be 1.0 mm to 1.5 mm wide.
- All margins
must be butt joint. No flared or feather edge margins.
- The enamel
surfaces created by parallel preparation are generally sufficient
for acid etching.
- With flat
cusps, a diverging preparation helps optomize the acid etching
of the enamel.
- The axial
walls of the proximal box should be flared slightly. The enamel
margin should not form an acute angle. Prepare proximal boxes
with 60º - 80º cavosurface angles (rounded internal line angles).
Avoid thin walls or flared preparations.
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ONLAY
PREPARATION
- An onlay
preparation is indicated when the preparation margin is less than
0.5 mm away from the cusp tip or when the enamel is severely undermined.
- Prepare tooth
with 2.0 mm of occlusal reduction, rounded internal line angles
and no bevels.
- Use same
procedure as for inlays.
- Cusp reduction
of 2.0 mm is recommended.
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Reprinted with
permission of Dentsply International. Cristobal+ is a registered trademark
of Dentsply International.
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