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Crowns
and Bridges
- Preparation
must include 180° (on labial surface) or 360° shoulder
margins. Bevel and feather edge preparations are not recommended.
- Rounded internal
line angles.
- For non-vital
teeth, a non-metallic post and/or build-up system is recommended.
- Anesthetize
area if indicated.
- Take preliminary
impression.
- Remove all
defective amalgams, composites and caries.
- If near pulpal
exposure, place small amount of calcium hydroxide in deepest area
of preparation.
- Even reduction
of 1.5 to 2.0 mm is recommended ending in a 0.8 - 1.0 deep chamfer
or shoulder margin. Ensure there is an adequate path of insertion.
- Take final
impression with Panasil vinyl polysiloxane. Ensure there are no
pulls or bubbles in the impression.
- Secure and
trim an adequate interocclusal record over preparation only.
- Apply separating
medium to surfaces of all prepared teeth. Fully seat and check
provisional over crown preparations. Reline temporary with cold
cure acrylic. Adjust at each stage as necessary. Cement temporary
restoration with dual - curing temporary cement (ensure is non-eugenol
if planning to bond, rather than cement, final restorations).
- Prepare a
detailed lab prescription with details regarding opposing teeth,
age and sex of patient, amount of occlusal staining required and
individual characterization needed.
- Include a
pre-op model for all anterior cases. Include an impression of
temporaries for all anterior restorations when four or more units
are involved.
Inlay
(for Inlay-type Bridges)
- Butt joint
margins, rounded internal line angles.
- 1.5 - 2.0
isthmus width.
- 2.0 mm cusp
reduction.
- 1.5 - 2.0
mm wide gingival floor.
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