SEM and TEM observation of the bonding interface created with an experimental one-bottle one-step resin bonding agent

• Published in: Adhesive Dentistry Vol. 26; no. 1; pp. 30 - 35
• Main Authors: UNO, Shigeru, MORIGAMI, Makoto, SUGIZAKI, Jumpei, YAMADA, Toshimoto
• Format: Journal Article
• Language: Japanese
• Published: Japan Society for Adhesive Dentistry 2008
• Subjects: bonding interface; one-bottle one-step resin bonding agent; SEM; TEM
• ISSN: 0913-1655; 2185-9566
• DOI: 10.11297/adhesdent1983.26.30

The adhesion of an experimental one-bottle one-step resin bonding agent (SI-R20603) to tooth structures was evaluated by SEM and TEM. For SEM observation, human extracted molars were used. After carious dentin was removed, the crown was horizontally cut to expose caries-affected dentin (CAD). The surface ground with # 1, 000 SiC paper was treated with SI-R20603 and filled with a resin composite. The specimen was cut into halves and embedded. After the cut surface was polished, argon-ion beam etched and Pt-sputtered, the bonding interface with enamel, intact dentin and CAD was observed by SEM. For TEM observation, intact dentin of human extracted molars was used. The bonding specimen created as above was ultra-thinned without demineralization. In SEM figures, the bonding agent created a rigid junction with enamel, intact dentin and CAD. TEM figures revealed tight adhesion to intact dentin. Although both in SEM and TEM no hybrid layer was observed at the bonding interface with dentin, an intermediate zone of approximately 0.5μm thick was found between the superficial dentin surface and the bonding agent. The results indicated that the adhesion of the experimental bonding agent is promising.