[Clinical efficacy and effects of CAD/CAM zirconia all-ceramic crown and metal-ceramic crown restoration on periodontal tissues].

Purpose: To investigate the clinical efficacy and effects of CAD/CAM zirconia all-ceramic crown, cobalt-chromium alloy and silver-palladium alloy porcelain-fused-to-metal crown restorations on periodontal tissues.

Methods: Forty-nine teeth with crowns in 46 patients were randomly assigned into CAD/CAM zirconia all-ceramic crown group, cobalt-chromium alloy porcelain-fused-to-metal crown group and silver-palladium alloy porcelain-fused-to-metal crown group. The amounts of GCF, TNF-α and IL-6 were analyzed before and 12 months after restorations, and the clinical efficacy was evaluated.