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Lava™ Crowns & Bridges |
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- PDF Documents
- Tech Notes
- Indications
- Preparation
- Cementation
- Working Time
- ADA Codes
TECHNICAL NOTES
It is not suggested to adjust the internal aspect of the zirconia. If an adjustment is required on the veneering ceramic, use a fine diamond at low-speed with water and air to keep the ceramic from fracturing. To polish the ceramic, use a porcelain polishing system or pink rubber wheel and diamond polishing paste (Brasseler, Shofu, and Vident).
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INDICATIONS / CONTRAINDICATIONS
Indicated for single-unit crowns and 8-unit bridges with a maximum span length of 55 mm. Ideal for inlay bridges, wing-type bridges and implant copings. Cantilever bridges with one pontic can be fabricated if the bridge has a double abutment.
Lava is not indicated when there is less than 1.5 mm of occlusal space, feather-edge margins, or bridge length is greater than 55 mm.
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PREPARATION
Anterior full-coverage crowns require a Chamfer with 1.5 - 2 mm facial reduction, 1 - 1.5 mm lingual contact clearance, 1.5 - 2 mm incisal reduction 1 - 1.5 mm reduction at the gingival margin with rounded internal line angles; or a Shoulder with 1.0mm lingual reduction, 2 mm incisal reduction, 1.5 mm labial reduction, 1 mm 360 degree rounded shoulder.
Posterior full-coverage crowns require a Chamfer margin with 1.5 - 2 mm occlusal reduction, 1.5 mm buccal and lingual reduction with rounded internal line angles; or a Shoulder with 1.5 - 2 mm occlusal reduction, 1.5 mm buccal and lingual reduction and 1 - 1.5 mm gingival margin reduction with rounded internal line angles.
Chamfer Margins - Correct preparation of the chamfer margins interproximally allows the appropriate bulk of porcelain. In addition, Lava has a digital wax up to bulk up the zirconia substructure when extra support for the ceramic is needed.
A Slice Preparation - This technique enables the ceramist to close the space and avoid unnatural lingual contours.
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CEMENTATION
Panavia 21
Glass Ionomer Cement (Fuji GC)
Resin Ionomer Cement (RelyX by 3M ESPE)
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WORKING TIME
5 Days In-lab
Rush Cases : All rush cases must be prescheduled by calling 800-944-7874 before the case is shipped. Time of pickup and delivery may affect turnaround time.
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CODES
D2740 Crown
D6245 Pontic for a bridge
D6740 Abutment for a bridge
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