3種の被着体と牛歯の接着強さに関する研究

Shear bond strengths of various resin cements between three types of adherends and bovine teeth with and without thermocycling.

抄録

3種類の被着体（コンポジットレジン，金属，セラミック）と牛歯との間の各種レジンセメントのせん断接着強さをサーモサイクルの有無にかかわらず評価した．従来のレジンセメント（Variolink N），2種類の接着性レジンセメント（PANAVIA F 2.0, Multilink N）および3種類の自己接着性レジンセメント（MAXCEM ELITE, Rely X Unicem 2, Speed CEM）を使用した．牛切歯の表層象牙質上に各レジンセメントを用いて被着体を接着した．各群10個ずつを5,000回サーモサイクルを行い，残りの10個はサーモサイクルを行わずに保存した．レジンおよびセラミック製の被着体を用いた場合，サーモサイクルの有無にかかわらず，Rely X Unicem 2のせん断接着強さは他のレジンセメントより有意に高かった（p＜0.05）．金属製被着体では，MAXCEM ELITEが最も低い強度を示した以外は，各セメント群に有意差は認められなかった．

This study evaluated the shear bond strengths of various types of resin cements between three types of adherends (composite resin, metal, and ceramic) and bovine teeth with and without thermocycling. A conventional resin cement (Variolink N), two adhesive resin cements (PANAVIA F 2.0, Multilink N), and three self-adhesive resin cements (MAXCEM ELITE, Rely X Unicem 2, Speed CEM) were used. The adherends were cemented on the superficial dentin of bovine incisors using each resin cement. Herein, 10 specimens from each group were thermocycled 5,000 times, and the other 10 were stored without thermocycling. With the resin and ceramic adherends, the shear bond strengths of Rely X Unicem 2 were significantly higher than those of the other resin cements both with and without thermocycling (p<0.05). With the metal adherend, the shear bond strengths were not significantly different among the cement groups, except MAXCEM ELITE, which showed the lowest strength.