Preparation guidelines for Zirlux crowns and bridges are similar to the guidelines clinicians use for all-ceramic restorations. General preparation guidelines for Zirlux zirconia include the following:
-Preparation should follow the anatomy of the tooth, providing at least the minimum thickness required for the respective restoration (see Minimum Zirconia Thickness to the right). Axial and occlusal reduction of 1.0mm is considered ideal for full-contour zirconia restorations.
-A definitive finish line (i.e., shoulder with rounded internal line angles or chamfer margin) is recommended. Featheredge preparations are acceptable for Zirlux restorations.
-All sharp edges and line angles should be rounded. Avoid undercuts, 90-degree shoulders, and gutter preparations.
Click here to download the Full PDF
