長期保管したワンステップ型ボンディング材におけるリン酸エッチング処理がエナメル質接着強さに及ぼす影響

概要

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The purpose of this study was to examine the influence of long-term storage and phosphoric acid treatment conditions in one-step bonding system on the enamel bond strength. Bonding systems used in this study included two kinds of one-step type (hereinafter called GB, AB). Bovine enamel and flowable resin composite were used as the adhered materials. The bonding systems were stored at room temperature. The storage periods were 1 and 180 days. One adherent's surface was applied with phosphoric acid treatment (PAT) condition and no pre-treatment (NON) condition. The bonded specimens were submitted to a shear bond strength test after 24-hour immersion in distilled water. The results obtained were as follows 1. Both GB and AB in NON condition showed significantly decreased the bond strength after 180 days. 2. For both GB and AB stored for 180 days, the bond strength in PAT condition was significantly larger than in NON condition. 3. No significant difference were observed in the bond strength of GB and AB between the systems stored for 1 day in NON condition and that stored for 180 days in PAT condition. 4. No significant difference was observed in the bond strength of GB in PAT condition whether it was stored for lday or 180 days. 5. The AB in PAT condition showed significantly decreased the bond strength after 180 days.
奥羽大学の論文