IADR Abstract Archives
Shear Bond Strengths Of Different Types Of Silane Primers
Objectives: To test shear bond strengths of three different types of commercially available silane primers.
Methods: Four silane primers were used in this study, including Bisco's Porcelain Primer (silane/no additive), Ivoclar's Monobond Plus and Kuraray's Clearfil Ceramic Primer (silane/acidic phosphate monomer), and Kerr Silane (silane/extra resin). Silica-based ceramics (Lithium Disilicate, EMax) were wet-polished by 320-grit SiC paper, and etched with Porcelain Etchant (4%HF 25seconds, Bisco). The etched lithium disilicate was applied the silane primer, cemented with a dual-cure resin cement (Duolink, Bisco) in self-cure mode (10min/37ºC) using an ultradent jig method (bonding area 4.5mm2). The cured specimens were stored in de-ionized water for 2hours/37 ºC or for additional 72hrs/100ºC and then tested until failure using a universal tester (Instron 4466) at a speed of 1mm/min (n=8).
Results:
Primer Types | Primer Name | Shear bond Strength, MPa(SD) | |
Storage 2hrs/37ºC | Storage 72hrs/100ºC | ||
Control | No primer | 19.9(5.7) | 9.5(4.3) |
pre-hydrolyzed silane | Bisco Porcelain Primer | 27.0(6.1)* | 21.0(5.9)* |
silane/extra resin | Kerr Silane | 24.4(5.7) | 12.0 (4.1) |
silane/acidic phosphate monomer | Monobond Plus | 22.7(4.7) | 13.9(3.5) |
Clearfil Ceramic | 23.9(6.3) | 11.1(4.6) | |
Results with the * are statistically higher than “Control-No primer” in the same column (p<0.05).
Conclusion:
Unmodified pre-hydrolyzed silane (e.g. Bisco Porcelain Primer) significantly improved the bond strength, both before and after boiling water accelerated aging (p<0.05). The silanes tested with additives (extra resin and/or phosphate monomer) had statistically same bond strength as the control-no primer (p > 0.05). This demonstrates that the bonding between the silane and the porcelain is very weak for the silane primers containing additives such as resins and/or phosphate monomers, and therefore the shear bond strength values after aging for 72 hours in boiling water differs very little from the control (no primer) values. Evidently, the Bisco Porcelain Primer is the most efficient and induces a true chemical bonding between the silane and the porcelain.