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 mm lingual reduction, 2 mm incisal reduction, 1.5 mm labial reduction, 1 mm 360° rounded shoulder.

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.

Adhesive bonding/dual cure materials include:

• Variolink (Ivoclar Vivadent)
• Choice (BISCO Dental)
• Insure (Cosmedent, Inc.)