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  • The effect of nano-structured alumina coating on resin-bond strength to zirconia ceramics
    Jevnikar, Peter, 1965- ...
    Objectivenes: The aim of this study was to functionalize the surface of yttriapartially stabilized tetragonal zirconia ceramics (Y-TZP) with a nano-structured alumina coating to improve resin ... bonding. Materials and methods: A total of 120 densely sintered disc-shaped specimens (15.5+/-0.03mm in diameter and 2.6+/-0.03mm thick) were produced from biomedical-grade TZ-3YB-E zirconia powder (Tosoh, Tokyo, Japan), randomly divided into three groups of 40 and subjected to the following surface treatments: AS - as-sintered; APA - airborne-particle abraded; POL - polished. Half of the discs in each group received an alumina coating that was fabricated by exploiting the hydrolysis of aluminium nitride (AlN) powder (groups AS-C, APA-C, POL-C). The coating was characterized using scanning electron microscopy (SEM), atomic force microscopy (AFM), and transmission electron microscopy (TEM). The shear-bond strength of the self-etching composite resin (RelyX Unicem, 3M ESPE, USA) was then studied for the coated and uncoated surfaces of the as-sintered, polished and airborne-particle abraded specimens before and after thermocycling (TC). Results: The SEM/TEM analyses revealed that the application of an alumina coating to Y-TZP ceramics created a highly retentive surface for resin penetration. The coating showed good surface coverage and a uniform thickness of 240nm. The resin-bond strength to the groups AS-C, APA-C, POL-C was significantly higher than to the groups AS, APA and POL, both before and after TC (p</=0.05). During TC all the specimens in the POL and AS groups debonded spontaneously. In contrast, the TC did not affect the bond strength of the AS-C, POL-C and APA-C groups. Significance: A non-invasive method has been developed that significantly improves resin-bond strength to Y-TZP ceramics. After surface functionalization the bond survives thermocycling without reduction in strength. (Abs. trunc. at 2000 ch.)
    Source: Dental materials. - ISSN 0109-5641 (Vol. 26, no. 7, 2010, str. 688-696)
    Type of material - article, component part
    Publish date - 2010
    Language - english
    COBISS.SI-ID - 26997977
    DOI

source: Dental materials. - ISSN 0109-5641 (Vol. 26, no. 7, 2010, str. 688-696)
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