大気圧プラズマ照射による歯科用合金の表面特性の変化

Changes in surface properties of dental alloys with atmospheric plasma irradiation.

抄録

大気圧プラズマ照射後の化学変化を分子間引力や原子・分子反応を評価して調べた。金，チタン，ステンレス合金の試料を#800グリットのSiC防水紙で研磨し，窒素ガス大気圧プラズマ照射を行った。処理した合金の表面自由エネルギーを計算し、統計的に比較した。プラズマ照射したすべての金属表面の表面自由エネルギーは，未処理の金属に比べて1.5倍高かった。また，水素結合成分のエネルギーが増加し，すべての合金表面がプラズマ照射のわずかな時間で金属酸化物で被覆されていた。プラズマで酸化された表面は高い活性エネルギーを示したが，これは主に水素結合成分の増加によるものであった。空気中の酸素との反応は，反応性元素が露出した清浄表面で促進された。

Chemical transitions after atmospheric pressure plasma irradiation were investigated by evaluating intermolecular attractions and atomic and molecular reactions. Gold, titanium and stainless-steel alloy samples were ground with #800 grit SiC waterproof paper and nitrogen gas atmospheric plasma irradiation was conducted. The surface free energies of the treated alloys were calculated and compared statistically. X-ray photoelectron spectroscopy analysis was performed.The surface free energies of all metal surfaces treated by plasma irradiation were 1.5-times higher than those of the untreated metals. The energy of the hydrogen bonding component increased, and all alloy surfaces were coated with metal oxide after only a short period of plasma irradiation. The surfaces oxidized by plasma exhibited a high active energy, mainly due to an increase in the hydrogen bonding component. Reactions with oxygen in the air were promoted on the clean surfaces with exposed reactive elements.