S M Wegner1, M Kern. 1. Department of Prosthodontics, Propaedeutics, and Dental Materials, School of Dentistry, Christian-Albrechts University, Arnold-Heller-Str. 16, D-24105 Kiel, Germany. swegner@proth.uni-kiel.de
Abstract
PURPOSE: The aim of this in vitro study was to evaluate the long-term bond strength of adhesive bonding systems to yttrium-oxide-partially-stabilized zirconia ceramic (YPSZ). MATERIALS AND METHODS: Plexiglas tubes filled with resin composite were bonded to industrially manufactured zirconia ceramic disks (96% ZrO2 stabilized by 4% Y2O3). After air abrading the ceramic and ultrasonic cleansing, groups of 16 samples were bonded in an alignment apparatus using 7 different bonding methods. Subgroups of 8 bonded samples were tested for tensile strength following storage in distilled water at 37 degrees C either for 3 days or 2 years. In addition, the 2-year samples were thermocycled 37,500 times. The statistical analyses were conducted with the Kruskal-Wallis test followed by multiple pair-wise comparison of the groups using the Wilcoxon rank sum test. RESULTS: A moderate to relatively high initial bond strength was achieved by air abrasion alone, the additional use of a silane, or acrylizing the YPSZ surface in combination with a conventional bis-GMA resin composite. However, these methods failed spontaneously over storage time. The use of the bis-GMA resin composite after tribochemical silica coating of YPSZ and the use of a polyacid-modified resin composite after air abrasion of YPSZ resulted in a high initial bond strength which decreased significantly over storage time. A durable resin bond strength to YPSZ was achieved only after air abrasion of YPSZ and using one of two resin composites containing a special phosphate monomer. CONCLUSION: A durable bond strength to YPSZ was achieved only by using resin composites containing a special adhesive monomer.
PURPOSE: The aim of this in vitro study was to evaluate the long-term bond strength of adhesive bonding systems to yttrium-oxide-partially-stabilized zirconia ceramic (YPSZ). MATERIALS AND METHODS: Plexiglas tubes filled with resin composite were bonded to industrially manufactured zirconia ceramic disks (96% ZrO2 stabilized by 4% Y2O3). After air abrading the ceramic and ultrasonic cleansing, groups of 16 samples were bonded in an alignment apparatus using 7 different bonding methods. Subgroups of 8 bonded samples were tested for tensile strength following storage in distilled water at 37 degrees C either for 3 days or 2 years. In addition, the 2-year samples were thermocycled 37,500 times. The statistical analyses were conducted with the Kruskal-Wallis test followed by multiple pair-wise comparison of the groups using the Wilcoxon rank sum test. RESULTS: A moderate to relatively high initial bond strength was achieved by air abrasion alone, the additional use of a silane, or acrylizing the YPSZ surface in combination with a conventional bis-GMAresin composite. However, these methods failed spontaneously over storage time. The use of the bis-GMAresin composite after tribochemical silica coating of YPSZ and the use of a polyacid-modified resin composite after air abrasion of YPSZ resulted in a high initial bond strength which decreased significantly over storage time. A durable resin bond strength to YPSZ was achieved only after air abrasion of YPSZ and using one of two resin composites containing a special phosphate monomer. CONCLUSION: A durable bond strength to YPSZ was achieved only by using resin composites containing a special adhesive monomer.
Authors: Abbas Azari; Sakineh Nikzad; Arash Yazdani; Faezeh Atri; Abbas Fazel Anvari-Yazdi Journal: J Mater Sci Mater Med Date: 2017-06-14 Impact factor: 3.896