Marginal Fit of All-Ceramic Crowns Before and After Cementation: An In Vitro Study

The marginal integrity of all-ceramic crowns for anterior and posterior teeth were evaluated. A total of 60 ceramic crowns (In-Ceram Alumina, IPS e.max Press, and Lava) were fabricated for the epoxy resin maxillary first central incisor and first molar and divided into three groups (n = 20). The crowns were measured at the facial, lingual, mesial, and distal finish lines (52 points) before and after cementation using scanning electron microscopy. The results were analyzed using one-way analysis of variance, paired samples t test, and independent t test. The mean values of marginal gaps were within acceptable clinical limits before and after cementation. The values of the anterior crowns at the buccal finish line were higher than those at the proximal finish line areas (P .05). However, these were insignificant at four measurement areas for posterior crowns (P > .05). Marginal gaps of crowns at the anterior teeth were higher than at the posterior teeth for all groups.