Development of a novel surface modification for improved bonding to zirconia

• Published in: Dental materials Vol. 27; no. 5; pp. e99 - e105
• Main Authors: Piascik, Jeffrey R, Wolter, Scott D, Stoner, Brian R
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01-05-2011
• Subjects: Adhesion; Adhesive bonding; Adhesiveness; Advanced Basic Science; Aluminum Oxide - chemistry; Analysis of variance; Bonding strength; Composite Resins - chemistry; Dental Bonding; Dental Cements - chemistry; Dental Etching - methods; Dental materials; Dental Materials - chemistry; Dental Polishing; Dental Stress Analysis - instrumentation; Dentin-Bonding Agents - chemistry; Dentistry; Fluorination; Fluorine - chemistry; Halogenation; Humans; Materials Testing; Microscopy, Electron, Scanning; Oxides - chemistry; Oxyfluorides; Photoelectron Spectroscopy; Polished; Resin Cements; Shear; Shear bond strength; Shear Strength; Silanation; Silanes - chemistry; Silicon Dioxide - chemistry; Stress, Mechanical; Surface modification; Surface Properties; Temperature; Time Factors; Water - chemistry; Zirconia; Zirconium - chemistry; Zirconium dioxide; Zirconia; Surface modification; Silanation; Adhesion; Shear bond strength
• ISSN: 0109-5641; 1879-0097
• DOI: 10.1016/j.dental.2011.01.005

Abstract Objective This report presents a novel pretreatment technique, whereby the zirconia surface is converted to a more reactive zirconium oxyfluoride, enabling improved chemical bonding to other dental substrates via conventional silanation approaches. Methods The study leverages a novel gas-phase fluorination process that creates a thin oxyfluoride conversion layer on the surface of zirconia, making it more reactive for conventional adhesive bonding techniques. Zirconia specimens, polished and roughened, were pretreated and composite cylinders bonded using conventional adhesive techniques. All specimens were subjected to a force at a crosshead speed of 0.5 mm/min in an electro-mechanical testing device. Single-factor analysis of variance (ANOVA) at a 5% confidence level was performed for the bonding strength data. Optical microscopy and scanning electron microscopy (SEM) were used to evaluate and quantify failure surfaces. Results Shear bond strengths were analyzed using single-factor ANOVA ( p < 0.05). Mechanical testing results revealed that fluorinated zirconia specimens (both rough and polished) displayed the highest shear bond strengths as compared to other commercially available treatments. X-ray photoelectron spectroscopy analysis helped determine that this novel pretreatment created a more reactive, 2–4 nm thick oxyfluoride conversion layer with approximate stoichiometry, ZrO3 F4. Conclusion Simple shear bond mechanical tests demonstrated that a fluorination pre-treatment is a viable method to chemically modify zirconia to produce a reactive surface for adhesive bonding.