Evaluation of retention of two implant supported ceramic crowns using two temporary cements

Abstract

Aim: The purpose of this in vitro study was to evaluate the effect of two temporary cements (Resin based cement and Eugenol Free Zinc oxide cement) on the retention of two titanium implant supported crowns made of (Polymer infiltrated hybrid glass ceramic and Yttrium stabilized tetragonal zirconia).Materials and methods: 20 dummy implants were inserted in epoxy resin blocks. The twenty blocks were divided according to the crown material into two groups (n=10): Group I: VITA ENAMIC™ crowns, Group II: BurxZir™ zirconia crowns. Each group were further sub-divided into two sub-groups (n=5), according to the temporary cement material used (Sub-group A: crowns cemented with DentoTemp™ cement, Sub group B: crowns cemented with Tempbond NE™ cement). The crowns were fabricated with CAD-CAM technology. Each crown had two wings on the mesial and distal surfaces to aid in retention analysis. The crowns were cemented to the titanium abutments and then retention was measured using uni-axial tensile force test.Results: DentoTemp™ cement showed a higher retentive values with both crown materials. The retentive values of the DentoTemp™ temporary cement was significantly higher than those of the Tempbond NE™ cement when used with BruxZir™ Zirconia crowns.Conclusions: Resin based temporary cement showed significantly higher retention results than non-eugenol temporary cement while the difference in crown material showed no significant difference.