Retention Forces of Implant-Supported Single Crowns and Fixed Dental Prostheses after Cementation: An In-Vitro Study

The aim of this in vitro study was to investigate three different cements for their suitability provide semi-permanent cementation, and compare the retention forces implant-supported single crowns (SC) three-unit fixed dental prostheses (FDP) luted with these cements. Twenty-four methacrylate models were supplied implants/abutments each simulate condition SCs/FDPs. Cobalt-chromium frameworks fabricated, sandblasted (Al2O3/50 µm/0.2 MPa) then cemented glass-ionomer (KTC), polycarboxylate (DUR) or self-adhesive resin cement (RXU). Specimens stored a saline-solution (NaCl/37 °C/24 h) subjected thermocycling. A universal testing machine pull-off device used remove copings. multi-factor ANOVA showed that force differed significantly among all SCs after NaCl storage (p < 0.05). Mean (in Newtons) (SCs/FDPs): KTC 170/352, DUR 409/406, RXU 265/426, thermocycling 156/262, 306/380, 494/508. FDPs higher values comparison SCs. For SCs, artificial aging resulted significant increase RXU, whereas decreased. Glass ionomer can be as both FDPs. Polycarboxylate is considered one year aging.