万能接着剤由来プライマーを用いた2段階接着剤の象牙質接着耐久性に及ぼす接着剤塗布法の影響．

Influence of bonding agent application method on the dentin bond durability of a two-step adhesive utilizing a universal-adhesive-derived primer.

抄録

万能接着剤由来プライマーを用いた2段階接着剤の象牙質接着耐久性に及ぼす接着剤塗布法の影響について検討した．熱サイクル後のせん断接着強さ試験により，ユニバーサル接着剤の接着耐久性を従来の2段階接着剤の接着耐久性と比較した．プライマーを塗布し（リン酸プレエッチングの有無），接着剤の塗布方法によって試験片を次の3群に分けた．(i)強いエアフロー塗布，(ii)穏やかなエアフロー塗布，(iii)穏やかなエアフロー＋2回目のボンディング塗布．せん断接着強さは、熱サイクル後に測定した。すべての因子（接着剤塗布法，接着システム，保存条件）は，リン酸プレエッチングの有無にかかわらず，象牙質せん断接着強さに有意な影響を及ぼした．その結果，緩やかなエアフローに暴露した試料は，強いエアフローおよび緩やかなエアフロー＋セカンドボンディングに暴露した試料よりも高いせん断接着強さを示した．試験した接着システムの接着耐久性は、接着剤の塗布方法に影響され、この傾向は材料に依存した。G2-Bondユニバーサルは，他の2段階接着システムと同等以上の象牙質接着耐久性を示した．

This study investigated the effect of the bonding agent application method on the dentin bond durability of a two-step adhesive utilizing a universal-adhesive-derived primer. The bonding durability of a universal adhesive was compared with those of two conventional two-step adhesives by shear bond strength testing after thermal cycling. The primer was applied (with or without phosphoric acid pre-etching), and the specimens were divided into three groups based on the bonding agent application method used as follows: (i) strong air-flow application, (ii) gentle air-flow application, and (iii) gentle air-flow + second bonding application. The shear bond strength was determined after thermal cycling. All the factors (bonding agent application method, adhesive system, and storage condition) significantly influenced the dentin shear bond strength both with and without phosphoric acid pre-etching. The specimens exposed to gentle air-flow showed a higher shear bond strength than did those exposed to strong air-flow and gentle air-flow + second bonding. The bond durability of the tested adhesive systems was influenced by the bonding agent application method, and this trend was material dependent. The G2-Bond Universal exhibited the same or greater dentin bond durability to the other two-step adhesive systems.