IADR Abstract Archives

Tensile Bond Strength vs. Shear Bond Strength Testing of RelyX Ultimate

Objectives: Recently, tensile bond strength (TBS) testing of resin cements has gained increased popularity by both the scientific society and manufacturers as alternative to the well-established shear bond strength (SBS) testing. However, it is still unclear how the data obtained from TBS and SBS testing compare to each other. Therefore, the aim of this study was to compare TBS and SBS of the adhesive resin cement RelyX Ultimate.
Methods: Adhesive resin cement RelyX™ Ultimate (RLXU) was tested with Scotchbond™ Universal Adhesive (SBU) and Scotchbond™ Universal Etchant (SBE), all 3M ESPE. All materials were applied according to the manufacturer’s instructions. H3PO4 etching of enamel/dentin was optionally performed (SBE). Bovine teeth were ground flat to expose enamel or dentin, polished (grit 320 sandpaper) and water-rinsed. Then, SBU was applied in self-cure (sc) or light-cure (lc) mode. Stainless steel rods with a screw thread (4mm diameter) were sandpapered, sandblasted, silanized (ESPETM Sil, 3M ESPE) and subsequently cemented onto the discs under standardized pressure (20g/mm2). Excess was removed using a microbrush/probe and RLXU was light-cured. Afterwards, loading weight was removed and the specimens were stored for 24h (36°C, 100% relative humidity). TBS and SBS were measured (Zwick Z010, TBS (n=10): crosshead speed 1.00mm/min; SBS (n=5): 0.75mm/min). Data analysis was performed using One-Way ANOVA (Fisher’s LSD; p<0.05).
Results: TBS and SBS values are significantly different (p<0.05) (Table).
Conclusions: TBS values on enamel are 35-50% (dentin ≈25%) of the values obtained by SBS testing and thus significantly different. TBS and SBS values show similar relative rankings. As a consequence, both TBS and SBS testing are suited to compare the bond strength of resin cements. However, the coefficient of variation [%] of TBS testing is significantly higher than for SBS testing. Therefore, SBS testing is the more reliable method to determine the bond strength of resin cements.
IADR/PER Congress
2016 IADR/PER Congress (Jerusalem, Israel)
Jerusalem, Israel
2016
0007
Dental Materials
  • Claussen, Kai  ( 3M , Seefeld , Germany )
  • Raia, Gioacchino  ( 3M , Seefeld , Germany )
  • Mueller, Renate  ( 3M , Seefeld , Germany )
  • Hecht, Reinhold  ( 3M , Seefeld , Germany )
  • All authors are employed by 3M and thus have financial interest.
    Oral Session
    Dental Materials I
    Tuesday, 09/20/2016 , 12:30PM - 02:00PM
    Mean, standard deviation (STD) and coefficient of variation (CV) determined by TBS and SBS testing of RelyX™ Ultimate to both enamel and dentin. Means that do not share a capital or lower-case letter are significantly different.
    Testing MethodPreparation ProtocolEnamel [MPa] ± STDTBS/SBS [%]CV [%]Dentin [MPa] ± STDTBS/SBS [%]CV [%]
    TBSRLXU-LC, SBU-SC15.5 ± 6.6G,H3543b10.0 ± 6.6I2366a
    SBSRLXU-LC, SBU-SC44.7 ± 5.1B,C3511c43.7 ± 10.9B,C2325c
    TBSRLXU-LC, SBU-SC, SBE25.1 ± 7.1E4428b11.8 ± 6.3H,I2453a
    SBSRLXU-LC, SBU-SC, SBE57.1 ± 2.3A444c48.7 ± 6.5B2413c
    TBSRLXU-LC, SBU-LC17.4 ± 4.2F,G4824b11.4 ± 4.6H,I2540a
    SBSRLXU-LC, SBU-LC36.1 ± 2.4D487c44.9 ± 6.9B,C2515c
    TBSRLXU-LC, SBU-LC, SBE22.2 ± 5.7E,F5026b9.7 ± 4.9I2451a
    SBSRLXU-LC, SBU-LC, SBE44.7 ± 4.4B,C5010c40.1 ± 2.8C,D247c