IADR Abstract Archives
Shear Bond Strength of Self-Adhesive Resin Cements
Objectives: To determine the shear bond strengths (SBS) of self-adhesive resin cements to zirconia according to ISO 29022:2013.
Methods: Three test groups (n=10) were prepared with the following materials: Group 1: SpeedCEM® Plus (Ivoclar Vivadent®), Group 2: RelyX™ Unicem 2 (3M), and Group 3: Maxcem Elite™ (Kerr™). Zirconia plates were sandblasted with 50 micron particles at 14.5 psi for 1 minute. Tetric EvoCeram® Bulk Fill IVA (Ivoclar Vivadent) composite rods, measuring 2.38mm X 2.00mm, were pre-fabricated and cured (DEMI™, Kerr) according to manufacturers’ instructions. Rods were then sandblasted with 50 micron alumina particles at 1 bar and ultrasonically cleaned prior to use. Cement cartridges were bled onto a mixing pad. Composite rods were dipped into a droplet of cement, placed onto the sandblasted zirconia, and inserted into the Ultradent jig. Steady pressure was applied to displace any excess material. Cements were cured for 20 seconds on each side of the composite rod. Samples were then placed in an incubator at 37°C for 24 hours prior to testing to ensure complete polymerization of the material. The Instron® 5566A (Norwood, MA) was used to test the SBS at 1 mm/minute crosshead speed. A microscope (Olympus-SZX16®) was used at 10X magnification to determine sample failure mode. Differences in SBS were analyzed using one-way ANOVA. Tukey’s HSD was used to adjust for multiple comparisons. Failure modes were analyzed using Fisher’s Exact Test.
Results: One-way ANOVA determined that there was a statistically significant difference between groups (p = <0.0001). Group 1 showed statistically significant differences when compared to Groups 2 and 3 (Table 1). There was no statistically significant difference between Groups 2 and 3 (p=0.9551). Differences in failure modes did not show statistical significance.
Conclusions: Group 1 demonstrated statistically better SBS for permanent cementation to zirconia which may have clinical implications but further testing is needed.
Methods: Three test groups (n=10) were prepared with the following materials: Group 1: SpeedCEM® Plus (Ivoclar Vivadent®), Group 2: RelyX™ Unicem 2 (3M), and Group 3: Maxcem Elite™ (Kerr™). Zirconia plates were sandblasted with 50 micron particles at 14.5 psi for 1 minute. Tetric EvoCeram® Bulk Fill IVA (Ivoclar Vivadent) composite rods, measuring 2.38mm X 2.00mm, were pre-fabricated and cured (DEMI™, Kerr) according to manufacturers’ instructions. Rods were then sandblasted with 50 micron alumina particles at 1 bar and ultrasonically cleaned prior to use. Cement cartridges were bled onto a mixing pad. Composite rods were dipped into a droplet of cement, placed onto the sandblasted zirconia, and inserted into the Ultradent jig. Steady pressure was applied to displace any excess material. Cements were cured for 20 seconds on each side of the composite rod. Samples were then placed in an incubator at 37°C for 24 hours prior to testing to ensure complete polymerization of the material. The Instron® 5566A (Norwood, MA) was used to test the SBS at 1 mm/minute crosshead speed. A microscope (Olympus-SZX16®) was used at 10X magnification to determine sample failure mode. Differences in SBS were analyzed using one-way ANOVA. Tukey’s HSD was used to adjust for multiple comparisons. Failure modes were analyzed using Fisher’s Exact Test.
Results: One-way ANOVA determined that there was a statistically significant difference between groups (p = <0.0001). Group 1 showed statistically significant differences when compared to Groups 2 and 3 (Table 1). There was no statistically significant difference between Groups 2 and 3 (p=0.9551). Differences in failure modes did not show statistical significance.
Conclusions: Group 1 demonstrated statistically better SBS for permanent cementation to zirconia which may have clinical implications but further testing is needed.
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