Fracture load of all-ceramic crowns after two different conditioning techniques

Purpose: This study investigated influence of two conditioning methods and two luting cements on the fracture load of all-ceramic crowns.
Materials and methods: A total of thirty-two CAD-CAM all-ceramic crowns, (Vita Mark II) were constructed on human upper premolars indicated for extraction and collected from department of oral surgery, faculty of dentistry, Mansoura University. The intaglio surfaces of 16 crowns were treated using acid (4.9% HF) with silane application. The other 16 crowns were conditioned using Monobond Etch & prime in one step. Each group divided into 2 subgroups (n=8) according to used type of luting cements. Self adhesive resin cement (Rely X U200) or multistep adhesive resin cement (Mutilinik Automix) were used for crowns cementation to appropriate teeth. Crowns were kept in water for 3 months but after cementations by one hour. Universal testing machine was used to record the fracture load for crowns (N).
Results: Means fracture load of groups luted with multistep adhesive resin cement were significantly higher than means fracture load of test groups luted using self adhesive resin cement regardless of conditioning techniques used (P < 0.05). Means fracture loads of other test groups were not statistically significant (P >0.05).
Conclusions: Two techniques used for conditioning of Vita Mark II crowns did not affect significantly fracture load of these crowns. Multilink adhesive resin cement improved fracture loads of Vita Mark II crowns compared to RelyX U200.