ブラケット間接接着における接着促進剤の効果

Effect of adhesion boosters on indirect bracket bonding.

抄録

目的:

2種類の接着促進剤が間接接着ブラケットのせん断接着強さと接着破壊部位に及ぼす影響を明らかにする。

OBJECTIVE: To determine the influence of two adhesion boosters on shear bond strength and on the bond failure location of indirectly bonded brackets.

材料および方法:

牛切歯60本を無作為に3群（n＝20）に分け，37％リン酸で頬側面部をエッチングした。第1群（コントロール）では，ブラケットをソンディ接着剤のみで間接的に接着した．第2群および第3群では，ソンディ接着の前に接着促進剤であるエンハンス・アドヒージョンブースターとアシュアユニバーサル・ボンディング・レジンをそれぞれ塗布し，ソンディ接着を行った．万能試験機で最大接着強度を測定し，接着破壊箇所をAdhesive Remnant Index（ARI）により評価した．せん断接着強さの比較には，一元配置分散分析とTukey test（P < .05）を，ARIスコアの差はKruskal-Wallis test（P < .05）を用いて評価した．また，接着強度とARIスコアに相関があるかどうかを調べるためにPearson相関係数を算出した．

MATERIALS AND METHODS: Sixty bovine incisors were randomly divided into three groups (n = 20), and their buccal faces were etched using 37% phosphoric acid. In group 1 (control), brackets were indirectly bonded using only Sondhi adhesive. In groups 2 and 3, the adhesion boosters Enhance Adhesion Booster and Assure Universal Bonding Resin, respectively, were applied before bonding with Sondhi. Maximum bond strength was measured with a universal testing machine, and the location of bond failure was evaluated using the Adhesive Remnant Index (ARI). One-way analysis of variance followed by the Tukey test (P < .05) was used to compare the shear bond strength among groups, and the differences in ARI scores were evaluated using the Kruskal-Wallis test (P < .05). The Pearson correlation coefficient was calculated to determine whether there was any correlation between bond strength and ARI scores.

結果:

3群の平均せん断接着強さは，他の群に比べ有意に高かった（P < 0.01）．接着破壊部位を評価したところ，3群間で差が認められた（P < 0.05）．第3群の接着強さとARIスコアには中等度の相関が認められた（r = 0.5860, P < 0.01）．

RESULTS: The mean shear bond strength in group 3 was significantly higher (P < .01) than in the other groups. Evaluation of the locations of bond failure revealed differences (P < .05) among the three groups. There was a moderate correlation between bond strength and ARI scores within group 3 (r  =  0.5860, P < .01).

結論:

In vitroでのせん断接着強度は全群で許容範囲内であった。アシュア接着ブースターの使用により，間接接着ブラケットのせん断接着強さとブラケット剥離後のエナメル質上に残存する接着剤の量が有意に増加した．

CONCLUSION: In vitro shear bond strength was acceptable in all groups. The use of the Assure adhesion booster significantly increased both the shear bond strength of indirectly bonded brackets and the amount of adhesive that remained on the enamel after bracket debonding.