象牙質深部に対する3種の接着システムの微小引張接着強さに及ぼすCasein Phosphopeptide Amorphous Calcium Phosphate Conditioningの影響．

Effect of Casein Phosphopeptide Amorphous Calcium Phosphate Conditioning on Microtensile Bond Strength of Three Adhesive Systems to Deep Dentin.

抄録

研究目的:

本研究は，3種の接着システムの象牙質深部に対する微小引張接着強さに及ぼすCasein phosphopeptide amorphous calcium phosphate（CPP-ACP）の影響を評価することを目的とした．

Objectives: This study aimed to assess the effect of casein phosphopeptide amorphous calcium phosphate (CPP-ACP) on microtensile bond strength of three adhesive systems to deep dentin.

材料および方法:

ヒトの健全な第三大臼歯30本の咬合面をセメントエナメル質接合部の上下2mmの位置で切片化した．試料は，OptiBond Solo Plus，G-Bond，Clearfil SE Bondの3群に無作為に分けた．コンポジットレジン接着前に，各群をCPP-ACPによる象牙質前処理を行った群と行わなかった群に分けた．その後，歯牙を1 mmのロッドに分割し（n=15），クロスヘッド速度0.5 mm/minで微小引張接着強さを測定した．データは2元配置のANOVAとポストホックのBonferroni検定で解析した．

Materials and Methods: In this in vitro study, the occlusal surface of 30 sound human third molars was sectioned at 2 mm below and above the cementoenamel junction. The samples were randomly divided into three groups of OptiBond Solo Plus, G-Bond, and Clearfil SE Bond. Before composite resin bonding, each group was divided into two subgroups with and without dentin preparation with CPP-ACP. The teeth were then sectioned into 1 mm rods (n=15), and their microtensile bond strength was measured at a crosshead speed of 0.5 mm/min. Data were analyzed using two-way ANOVA and post-hoc Bonferroni test.

結果:

オプティボンドソロプラス（P=0.44）およびクリアフィルSEボンド（P=0.67）は，CPP-ACPの有無にかかわらず接着強さに有意差は認められなかった．G-Bondでは，この点で2つのサブグループ間に有意差が認められた（P<0.001）．また，微小引張接着強さは，すべてのサブグループ間で有意差が認められた（P＜0.05）．

Results: There was no significant difference in bond strength of OptiBond Solo Plus (P=0.44) and Clearfil SE Bond (P=0.67) with/without CPP-ACP. A significant difference was found between the two subgroups of G-Bond in this respect (P<0.001). The differences in microtensile bond strength among all subgroups were significant (P<0.05).

結論:

CPP-ACPによる象牙質処理後，G-Bond使用時の微小引張接着強さは，CPP-ACP未使用時と比較して有意に高い値を示した．

Conclusion: The microtensile bond strength in use of G-Bond is significantly higher following dentin treatment with CPP-ACP compared with no use of CPP-ACP.