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ID 55297
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Yoshihara, Kumiko Centrer for Innovative Clinical Medicine, Okayama University Hospital
Nagaoka, Noriyuki Advanced Research Center for Oral and Craniofacial Sciences, Okayama University Dental School
Maruo, Yukinori Department of Occlusion and Removable Prosthodontics, Okayama University Hospital
Nishigawa, Goro Department of Occlusion and Removable Prosthodontics, Okayama University Hospital
Irie, Masao Department of Biomaterials, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
Yoshida, Yasuhiro Department of Biomaterials and Bioengineering, Graduate School of Dental Medicine, Hokkaido University
Meerbeekf, Bart Van KU Leuven (University of Leuven), Department of Oral Health Sciences, BIOMAT & University Hospitals
Abstract
 OBJECTIVE:  CAD-CAM blocks to fabricate semi-direct and indirect restorations are available in different sorts of ceramics as well as composite. In order to bond restorations prepared out of composite blocks into tooth cavities, it is recommended to gently sandblast the surface prior to the application of a primer/adhesive. Today, the effect of sandblasting composite block surfaces has not thoroughly been investigated. In this study, the ultra-structure of composite CAD-CAM blocks was investigated with special attention to the effect of sandblasting on the surface topography and of silanization on the bonding performance.  METHODS:  Five different composite CAD-CAM blocks were involved. We correlatively investigated their structural and chemical composition using X-ray diffraction (XRD), energy dispersion spectroscopy (EDS), scanning electron microscopy (SEM) and (scanning) transmission electron microscopy ((S)TEM). The effect of sandblasting was also imaged in cross-section and at the interface with composite cement. Finally, we measured the shear bond strength to the sandblasted block surface with and without silanization.  RESULTS:  All composite blocks revealed a different ultra-structure. Sandblasting increased surface roughness and resulted in an irregular surface with some filler exposure. Sandblasting also damaged the surface. When the sandblasted composite blocks were silanized, superior bonding receptiveness in terms of higher bond strength was achieved except for Shofu Block HC.  SIGNIFICANCE:  Sandblasting followed by silanization improved the bond strength to composite CAD-CAM blocks. However, sandblasting may also damage the composite CAD-CAM block surface. For the composite CAD-CAM block Shofu Block HC, the damage was so severe that silanization did not improve bond strength.
Keywords
CAD–CAM
bond strength
composite
sandblast
silane coupling agent
Published Date
2017-03
Publication Title
Dental Materials
Volume
volume33
Issue
issue3
Publisher
Elsevier Science
Start Page
e124
End Page
e135
ISSN
0109-5641
NCID
AA10443138
Content Type
Journal Article
language
英語
OAI-PMH Set
岡山大学
Copyright Holders
https://creativecommons.org/licenses/by-nc-nd/4.0/deed.ja
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Web of Science KeyUT
Related Url
isVerionOf https://doi.org/10.1016/j.dental.2016.12.003