A Comparison of the Shear Bond Strength of Zirconia to Enamel Using Different Surface Treatments.
Abstract: Objective The purpose of this in vitro study is to compare the shear bond strength of of air abraded zirconia, acid etched zirconia (Piranha solution), phosphate monomers, and silanization to enamel, all bonded with a phosphate-methacrylate resin cement. Materials and methods Seventy extracted intact human molars were collected, cleaned and mounted in autopolymerizing acrylic resin, with ... read morethe experimental surface of the teeth exposed. The specimens were randomized and cemented to seven groups of zirconia specimens (4mm diameter and 2mm thickness). Group 1: Air particle abrasion; Group 2: Airborn particle abrasion and ZPRIME Plus Group 3: Air particle abrasion and alloy primer; Group 4: Piranha solution 7:1; Group 5: Piranha solution 7:1 and Z-PRIME Plus; Group 6: Piranha solution 7:1 and Alloy primer; Group 7: Cojet and silan. The cemented specimens were stored in distilled water for one day, then thermocycled (5ºC and 55ºC) for 500 cycles. Statistical analysis was performed using one way ANOVA (α =0.05), and multiple comparisons were performed using Tukey's HSD. Results Air particle abrasion and zirconia primer resulted in a significantly higher shear bond strength (P <0.001) than the other surfaces. Cojet and silan showed high shear bond strength. However, Cojet and silan showed no significant difference from air particle abrasion (control). All mechanically treated experimental groups showed higher SBS than chemically treated experimental groups. Failure mode was predominantly mixed in mechanically treated groups, and predominantly adhesive in the chemically treated groups. No cohesive failures were observed. Conclusions Airborne-particle abrasion followed by the application of a zirconia primer resulted in the highest shear bond strength. Therefore, this method represents a practical procedure resulting in improved zirconia shear bond strength to enamel. The use of air particle abrasion and zirconia primer can be recommended as a promising surface treatment method to achieve a durable bond to densely sintered zirconia ceramics. The bond between zirconia treated with air particle abrasion and zirconia primer, and resin cement is comparable to the bond between resin cement and enamel.
Thesis (M.S.)--Tufts University, 2011.
Submitted to the Dept. of Posthodontics.
Advisor: Roya Zandparsa.
Committee: Matthew Finkelman, Yongjeong Kim, and Gerard Kugel.
Keyword: Dentistry.read less