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faculteit: "ACTA" en publicatiejaar: "2009"
| Auteurs||M. Rosentritt, M. Behr, J.M. van der Zel, A.J. Feilzer|
|Titel||Shear bond strength of cement to zirconia|
|Tijdschrift||Journal of Adhesion Science and Technology|
|Samenvatting||This study investigated the shear bond strength (SBS) of various cements to zirconia ceramic.
CoCr-cylinders were bonded to zirconia plates (20 mm × 10 mm × 2 mm; n = 8 per group) using four self-adhesive resin cements (one capsule, three hand-mixed) and four resin cements, partly in combination with a tribochemical/silane treatment. All cements were auto-polymerizing. The bonding areas were sandblasted using 110 μm Al2O3. The shear bond strength was determined after 24 h, 30 days, 90 days of water storage (37°C) and after 12 000 thermal cycles. Statistical analysis was performed using one-way analysis of variance (ANOVA) and Bonferroni post hoc test (α = 0.05).
After 24 h and after thermal cycling (TC) the lowest value of shear bond strength was found for the control Variolink without bonding pre-treatment (9.5 MPa/3.1 MPa) and the highest results were determined for Calibra with bonding pre-treatment (37.3 MPa/31.9 MPa). After 30 days and 90 days of storage in water the highest SBS values were found for RelyX (33.3 MPa/28.6 MPa), and again lowest values were determined for Variolink (8.8 MPa/9.1 MPa). After 90 days storage all samples of Maxcem failed. The groupwise comparison revealed significantly different SBS results between 90 days storage and the initial results after 24 h (p = 0.003). No significant differences were found between the other storage conditions (p > 0.057). The systems without bonding pre-treatment provided significantly lower SBS in comparison to the self-adhesive systems and the systems with bonding pre-treatment (p = 0.000).
Within the limitations of this study, three of four self-adhesive bonding systems provided bond strengths to zirconia, comparable to systems with additional bonding pre-treatment. The durability of the bonding resin and zirconia can only be judged after long-term water storage.|
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