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ADA Code - D2740 Crown D2610 Inlay for 1 surface D2620 Inlay for 2 surfaces D2630 Inlay for 3 surfaces D2962 Labial Veneer D2783 Crown 3/4 Porcelain Ceramic (not including veneers) D6245 Pontic Porc/Ceramic
Prep Requirements Anterior full-coverage crowns require a Chamfer with 1.5-2.0mm 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 mm 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. ------------------------------------- Inlays and Onlays require 1.5 - 2 mm isthmus width, 1 - 1.5 mm wide gingival floor with rounded internal line angles and butt joint margins. ------------------------------------- Veneers require a uniform preparation and lingual reduction to increase strength. A medium-grit round-ended diamond is used to join the depth cut grooves to establish a uniform preparation and porcelain thickness of at least 1 mm. The diamond is angled to eliminate undercuts and establish a butt joint on the lingual aspect of the preparation. The incisal edge should be rounded to eliminate sharp line angles. ------------------------------------- Chamfer Margins - Correct preparation of the chamfer margins interproximally allows the appropriate bulk of porcelain.
Recomended Cementation For greatest strength, and where preparation allows for dry field (supra-gingiva margins), it is recommended to use Adhesive bonding, such as VarioLink II (Ivoclar) or other dual cure materials like Choice (Bisco). ------------------------------------- For areas subgingival, or when a dry field cannot be achieved, Ivoclar recommends a Hybrid Glass Ionomer cement system with less than 0.5% expansion. (NOTE: Resin-reinforced glass ionomers such as Advance & Vitremer are not indicated for any all-ceramic restoration.)
Material Content
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IPS e.max Press is an innovative lithium disilicate glass-ceramic (LS2) ingot for the press technology.
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