Marginal adaptation of all-ceramic crowns on implant abutments.

Background: Studies focusing on the marginal accuracy of all-ceramic crowns on implant abutments are in short supply.

Purpose: This study evaluated the marginal accuracy of all-ceramic crowns on different implant abutments.

Materials And Methods: Ninety-six standardized maxillary central incisor crowns (48 alumina and 48 zirconia) were fabricated for each of the six test groups (n = 16) (Ti1, titanium abutments-alumina crowns; Ti2, titanium abutments-zirconia crowns; Al1, alumina abutments-alumina crowns; Al2, alumina abutments-zirconia crowns; Zr1, zirconia abutments-alumina crowns; Zr2, zirconia abutments-zirconia crowns).