Generic zirconia combines the esthetics your patients demand with the strength and affordable price you desire. Laboratory tests have shown the fracture toughness and flexural strength of zirconia are significantly higher than that of alumina or any other all-ceramic. With zirconia, there is no metal to show through the ceramic and no unsightly black lines at the gingival margin.
Anterior full-coverage crowns require a chamfer with 1.5 mm facial reduction, 1.5 mm lingual contact clearance, 1.5 mm incisal reduction 1.25 mm reduction at the gingival margin with rounded internal line angles; or a shoulder with 1.0 mm lingual reduction, 2.0 mm incisal reduction, 1.5 mm labial reduction, 1.0 mm 360 degree rounded shoulder.
Posterior full-coverage crowns require a chamfer margin with 2.0 mm occlusal reduction, 1.5 mm buccal and lingual reduction with rounded internal line angles; or a shoulder with 2.0 mm occlusal reduction, 1.5 mm buccal and lingual reduction and 1.25 mm gingival margin reduction with rounded internal line angles.
Chamfer Margins – Correct preparation of the chamfer margins interproximally allows the appropriate bulk of porcelain