Influence of firing cycles on the margin distortion of 3 all-ceramic crown systems.

Statement Of Problem: Although all-ceramic restorations are widely used, there is a lack of information about how the fit is affected by fabrication procedures. The adequacy of the fit of all-ceramic restorations has been questioned.

Purpose: This study examined the effect of porcelain and glaze firing cycles on the fit of 3 types of all-ceramic crowns.