Effect of surface conditioning and taper angle on the retention of IPS e.max Press crowns.

Purpose: The objective of this study was to evaluate the retentive strength of single-unit crowns with 10 degrees and 26 degrees taper angles cemented using two surface conditioning methods.

Materials And Methods: Thirty-two freshly extracted sound human molars were divided into two groups (n = 16) and prepared in a standardized manner with 10 degrees and 26 degrees taper angles. All-ceramic (IPS e.

Fracture resistance of metal- and galvano-ceramic crowns cemented with different luting cements: in vitro comparative study.

This study aimed to compare the fracture resistance of galvano-ceramic crowns with metal-ceramic crowns cemented to natural premolar teeth with different luting cements. Sixty intact maxillary premolars were prepared to receive full-coverage crown restorations and were divided into 2 equal groups (n = 30): galvano-ceramic crowns and metal-ceramic crowns. Each group was further subdivided into 3 equal subgroups (n = 10) according to the luting cement used: zinc-phosphate, glass-ionomer, or adhesive-resin cement.