title: Influence of surface preparation on fracture load of resin composite-based repairs.
abstract: The purpose of the present study is to evaluate the fracture load of composite-based repairs to fractured zirconium oxide (Z) crowns and to ceramic-fused-to-metal (CM) crowns, comparing different mechanical surface preparation methods. A total of 75 crowns were repaired; samples then underwent dynamic loading and thermocycling. Final fracture load values for failure of the repaired crowns were measured and the type of fracture registered. Group I: CM: Surface preparation with a diamond bur + 9.5% Hydrofluoric Acid (HF) etching; Group II): CM: air-particle (Al2O3) + 9.5% HF; Group III: CM: Silica coating (SiO2); Group IV): Z: air-particle (Al2O3) + HF 9.5%; Group V) Z: Silica coating (SiO2). Of the three CM groups, Group I (CM-diamond bur) showed the highest mean failure value, with significant difference in comparison with Group III (CM-silica coating). For the zirconia groups, the highest value was obtained by Group V (silica coating). Key words:Crown, ceramic-fused-to-metal, zirconia, resin-composite, ceramic covering.
authors: Associate Lecturer, Department of Dental Medicine, Faculty of Medicine and Dentistry, University of Valencia, Spain.
authors: Rubén
authors: R
authors: Agustín-Panadero
authors: Master of Buccofacial Prosthetics, Department of Dental Medicine, Faculty of Medicine and Dentistry, University of Valencia, Spain.
authors: Rocío
authors: R
authors: Mateos-Palacios
authors: Associate Lecturer, Department of Dental Medicine, Faculty of Medicine and Dentistry, University of Valencia, Spain.
authors: Juan-Luis
authors: JL
authors: Román-Rodríguez
authors: Assistant Lecturer, Department of Dental Medicine, Faculty of Medicine and Dentistry, University of Valencia, Spain.
authors: María-Fernanda
authors: MF
authors: Solá-Ruíz
authors: Senior Lecturer, Department of Dental Medicine, Faculty of Medicine and Dentistry, University of Valencia, Spain.
authors: Antonio
authors: A
authors: Fons-Font