Adhesive Mechanism of a Self-etching/Self-priming Adhesive Resin to Human Enamel and Dentin

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Self-etching/self-primlng adhesive systems have recently been marketed to simplify the dentin bonding procedure by combining the etching and priming steps. The purpose of this study was to measure the regional tensile bond strength (TBS) of various portions of human tooth enamel and dentin, and to observe by scanning electron microscopy (SEM) the resin-dentin interfaces after applying an experlmental self-etching/self-priming adhesive system. Five human extracted cuspid teeth were used to measure TBS with a micro-tensile bond test. The outer enamel was removed from the incisal tooth surfaces, and the outcr dentin was removed from the labial tooth surfaces to form a long cavity preparation in the middle dcntin from the mid-crown to the apex of the root within the same tooth. An experimental self-etching/self-priming system (IB-301, Shofu) was bonded to the surfaces, and covered with a resin-composite. The resin-bonded teeth were serially sliced at right angles to the long axis of the tooth, and the bonded surfaces were trirnmcd to give a bonded surface area of 1mm^2 for the TBS test. IB-301 showed the highest TBS (33.1 MPa) in middle root dentin, and the lowest TBS (17.4 MPa) in enamel. SEM showed that the thickness of the hybrid layer of this system was 1-2 μm in coronal dentin, and thinner in root dentin. These results suggested that the experimental self-etching/self-priming system produces good adhesion in root dentin with minimal hybrid layer fornration.
硬組織再生生物学会の論文

Adhesive Mechanism of a Self-etching/Self-priming Adhesive Resin to Human Enamel and Dentin

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