IADR Abstract Archives
Shear-bond-strength to ceramics of self-adhesive resin-cements: effects of Cleaning Agents
Objectives: The purpose was to investigate the effects on shear-bond-strength (SBS) of two saliva-contaminated ceramics (IPS e.max, Ivoclar Vivadent: e.max, and Katana HT, Kuraray Noritake: HT) with various cleaning-agents (CA): (DC-200C: Kuraray Noritake: DC; Ivoclean: Ivoclar Vivadent: IC; 37% aq. phosphoric acid, Kuraray Noritake, PA; ZirClean, Bisco: ZC). The two self-adhesive resin-cements were Panavia SA Cement Universal, (Kuraray Noritake: KU) and RelyX Unicem 2 Automix, (3M). The hypothesis to be tested was that the bond stregnth was recovered by pretreating with CAs.
Methods: IPS e.max was pretreated with Ceramic Etching Gel (20 s, Ivoclar). Katana HT was pretreated via sandblasting (Alumina, diameter: 50 micro-meters, 0.3 MPa), after being both grinded with wet # 320 carborundum paper. After human saliva contamination (10 s) and air-dry, each ceramic was divided into five groups of cleaning methods (n=10): without cleaning (Air-dry), DC, IC, PA and ZC. Surfaces of each ceramic without saliva contamination were used as control groups (Base). 2 mm thick Teflon molds with a 3.6 mm cylindrical hole were clamped onto each ceramic surface, filled with cement and a stainless steel rod (diameter: 3.4 mm; height: 2 mm) was inserted into each resin-cement. Light-irradiation was used to harden the resins (40 s). For all specimens, after 24 h storage, a shear force was applied via a universal testing machine.
Results: Two types of ceramics contaminated with human saliva substantially recovered their bond strength after treatment with some CAs, however the bond strength to e.max contaminated with human saliva did not fully recover with KU.
Conclusions: Two types of ceramics contaminated with human saliva substantially recovered their bond strength by treating with some CAs, except for e.max and KU. The test hypothesis was therefore accepted.
Methods: IPS e.max was pretreated with Ceramic Etching Gel (20 s, Ivoclar). Katana HT was pretreated via sandblasting (Alumina, diameter: 50 micro-meters, 0.3 MPa), after being both grinded with wet # 320 carborundum paper. After human saliva contamination (10 s) and air-dry, each ceramic was divided into five groups of cleaning methods (n=10): without cleaning (Air-dry), DC, IC, PA and ZC. Surfaces of each ceramic without saliva contamination were used as control groups (Base). 2 mm thick Teflon molds with a 3.6 mm cylindrical hole were clamped onto each ceramic surface, filled with cement and a stainless steel rod (diameter: 3.4 mm; height: 2 mm) was inserted into each resin-cement. Light-irradiation was used to harden the resins (40 s). For all specimens, after 24 h storage, a shear force was applied via a universal testing machine.
Results: Two types of ceramics contaminated with human saliva substantially recovered their bond strength after treatment with some CAs, however the bond strength to e.max contaminated with human saliva did not fully recover with KU.
Conclusions: Two types of ceramics contaminated with human saliva substantially recovered their bond strength by treating with some CAs, except for e.max and KU. The test hypothesis was therefore accepted.
