Affiliations: [a] KU Leuven BIOMAT, Department of Oral Health Sciences, Biomedical Sciences Group, KU Leuven (University of Leuven), Leuven, Belgium | [b] Division of General Dentistry, Department of Clinical Oral Health Science, Tokyo Dental College, Tokyo, Japan | [c] Section of Operative Dentistry, School of Dentistry, Oral Pathology and Maxillo-facial Surgery, KU Leuven (University of Leuven), Leuven, Belgium | [d] Department of Conservative Dentistry, Periodontology and Preventive Dentistry, Hannover Medical School, Hannover, Germany | [e] Department of Dentistry, Toranomon Hospital, Tokyo, Japan
Correspondence:
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Address for correspondence: Atsushi Kameyama, Department of Endodontics and Clinical Cariology, Tokyo Dental College, 2-9-18 Misaki-cho, Chiyoda-ku, Tokyo 101-0061, Japan. Tel.: +81 3 6380 9136; E-mail: kameyama@tdc.ac.jp.
Abstract: The aim of this study was to investigate bonding effectiveness in direct restorations. A two-step self-etch adhesive and a light-cure resin composite was compared with luting with a conventional dual-cure resin cement and a two-step etch and rinse adhesive. Class-I box-type cavities were prepared. Identical ceramic inlays were designed and fabricated with a computer-aided design/computer-aided manufacturing (CAD/CAM) device. The inlays were seated with Clearfil SE Bond/Clearfil AP-X (Kuraray Medical) or ExciTE F DSC/Variolink II (Ivoclar Vivadent), each by two operators (five teeth per group). The inlays were stored in water for one week at 37°C, whereafter micro-tensile bond strength testing was conducted. The micro-tensile bond strength of the direct composite was significantly higher than that from conventional luting, and was independent of the operator (P<0.0001). Pre-testing failures were only observed with the conventional method. High-power light-curing of a direct composite may be a viable alternative to luting lithium disilicate glass-ceramic CAD/CAM restorations.
