Evaluation of marginal fit of vertical versus horizontal finishing line designs of monolithic zirconia crowns (invitro study)
Abstract: The aim of this invitro study was to evaluate the influence of two kinds of finishing line (FL) preparation designs (biologically oriented preparation technique (BOPT) and chamfer) on marginal fit of monolithic zirconia (ZrO2) crowns in anterior teeth.Material and Methods: as this study is a supplementation for a clinical part accomplished at the same time, so A total of 16 metal dies of upper two central were milled from STL file of in vivo case to replicate the creation of an all-ceramic full-coverage crown for central incisor teeth with two types of finish lines and thenThe monolithic zirconia restorations were fabricated by using a CAD/CAM system equipped with a scanner to digitalize the prepared metal dies. The marginal fit was evaluated bystereomicroscope.Conclusions:The marginal fit of both BOPT and chamfer designs was within the clinical acceptance limit.
Keywords:: Finishing line , Marginal fit, monolithic zirconia crowns, Horizontal preparation, vertical preparation.