[Effect of polishing method and time on the fitness of CAD/CAM zirconia ceramic crown].

Purpose: To compare the effect of different polishing methods and time treatment on the fitness of CAD/CAM zirconia ceramic crowns.

Methods: Sixteen intact maxillary premolars were randomly divided into two groups, group A was treated with silicon carbide burs, while group B was treated with tungsten steel burs. At different polishing time points of the same tooth, digital impressions of each group were obtained, which were used to manufacture CAD/CAM zirconium ceramic crowns.