Novel approach to improved silanation of zirconia

Objective : The overall goal of this research was to chemically modify the surface of zirconia dental ceramics with a Si x O y seed layer to increase adhesive bonding with commercially available silanes and resin cements.

Materials and methods : Investigation focused on a novel approach to functionalize the zirconia surface with Si x O y that would promote chemical bonding with traditional organo-silanes. Planar test structures were prepared, modified, and analyzed, before and after Si–O modification using X-ray photoelectron spectroscopy (XPS). Varying thicknesses of Si x O y were deposited on ZirCAD blocks and bonded to a similar dimension composite block. Microtensile bars were prepared and subjected to tensile forces, scanning electron microscopy (SEM) was used to analyze fracture surfaces and determine failure mode.

Results : XPS analysis revealed a level of bonded Si x O y to the surface of zirconia. Microtensile bond testing revealed that a thin (2.6 nm) Si x O y modification was similar in bond strength to the porcelain control group. Other groups tested had lower strength values and higher percentages of adhesive failures.

Table. Microtensile bond strengths (MPa) and fracture modes of the test groups.
Group Peak stress (SD) (MPa) Adhesive (%) Mixed mode (%) Cohesive (%)
Composite (bars only) a 29.2 (3.7) Control
Porcelain – (control) b 25.3 (5.3) 16 35 49
Zirconia (Si x Oy – 2.6 nm thickness) b 23.2 (5.4) 15 40 45
Zirconia (CoJet treatment) c 18.6 (5.9) 32 52 16
Zirconia (Si x O y – 23 nm thickness) c 16.2 (5.9) 50 43 7
Zirconia (no treatment) d 7.6 (3.0) 72 28
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Nov 30, 2017 | Posted by in Dental Materials | Comments Off on Novel approach to improved silanation of zirconia
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