IADR Abstract Archives
Performance of an Experimental Bis-GMA-Free Pit-and-Fissure-Sealant
Objectives: This study compares an experimental Bis-GMA-free pit-and-fissure-sealant (PFS) with commercially available PFS. Depth-of-cure (DC) and shear-bond-strength (SBS) were investigated, together with the rheological properties (RP) viscosity (η) and shear-thinning behavior (STB).
Methods: DC was tested as in ISO-6874 using a standard dental curing-light (1100 mW/cm2, Bluephase Style, Ivoclar-Vivadent). SBS to phosphoric acid etched (t=30s) bovine enamel as in ISO-29022 was employed to test adhesion after 24h. Materials were light-cured according to instructions-for-use. RP were monitored in a controlled shear-rate test (γ1=0.1s-1 for 30s, γ2=100s-1 for 2s, γ3=0.1s-1 for 150s) to investigate handling properties. Viscosity was measured 10s after beginning of low-shear-section γ3. The following materials were investigated: (see table 1)
Results: The table shows DC, SBS, η and STB of the investigated PFS. (see table 2)
Conclusions: All pit-and-fissure-sealants fulfilled ISO-required >1,5mm depth-of-cure. UXT gave highest depth-of-cure and shear-bond-strength, followed by EFS, TMF had lowest depth-of-cure and shear-bond-strength. UXT, BSE, EWB, FSF and EFS showed shear-thinning behavior and all pit-and-fissure-sealants were of appropriate viscosity for the intended use. For precise maxilla-placement, EFS showed a promising combination of shear-thinning behavior and viscosity. Within limitations of this study, an experimental Bis-GMA-free pit-and-fissure-sealant achieved high depth-of-cure, shear-bond-strength and good handling properties.
Methods: DC was tested as in ISO-6874 using a standard dental curing-light (1100 mW/cm2, Bluephase Style, Ivoclar-Vivadent). SBS to phosphoric acid etched (t=30s) bovine enamel as in ISO-29022 was employed to test adhesion after 24h. Materials were light-cured according to instructions-for-use. RP were monitored in a controlled shear-rate test (γ1=0.1s-1 for 30s, γ2=100s-1 for 2s, γ3=0.1s-1 for 150s) to investigate handling properties. Viscosity was measured 10s after beginning of low-shear-section γ3. The following materials were investigated: (see table 1)
Results: The table shows DC, SBS, η and STB of the investigated PFS. (see table 2)
Conclusions: All pit-and-fissure-sealants fulfilled ISO-required >1,5mm depth-of-cure. UXT gave highest depth-of-cure and shear-bond-strength, followed by EFS, TMF had lowest depth-of-cure and shear-bond-strength. UXT, BSE, EWB, FSF and EFS showed shear-thinning behavior and all pit-and-fissure-sealants were of appropriate viscosity for the intended use. For precise maxilla-placement, EFS showed a promising combination of shear-thinning behavior and viscosity. Within limitations of this study, an experimental Bis-GMA-free pit-and-fissure-sealant achieved high depth-of-cure, shear-bond-strength and good handling properties.