単結晶および多結晶アルミニウムセラミックス上の歯肉縁下プラーク形成

Subgingival plaque formation on single and polycrystal aluminum ceramics.

抄録

ヒト口腔内における2種類の歯科インプラント材料上の歯肉縁下プラーク形成について検討した．重度の歯周炎に罹患し，抜歯が予定されている5名の患者15歯を選択した．ルートプレーニングを行った後，歯肉縁から歯肉縁下5 mmまでのインレー窩を作製した．その後，長方形の試験片（多結晶アルミニウムセラミック（P），単結晶アルミニウムセラミック（S））または対照象牙質試験片（D）を金インレーに装着し，3，7，21日間静置した．各試験期間終了後，試験片をインレーから取り出し，走査型電子顕微鏡(SEM)で観察した．その結果，SはPよりもプラーク蓄積の程度が低く，臨床応用の観点からより適切な歯科インプラント材料であることが示唆された．

A study was conducted to investigate subgingival plaque formation on two types of dental implant material in the human oral cavity. Fifteen teeth affected by severe periodontitis and scheduled for extraction in five patients were selected. After thorough root planing, inlay cavities were prepared from the gingival margin to 5 mm subgingivally. Then, rectangular test specimens (polycrystal aluminum ceramic (P), single-crystal aluminum ceramic (S)) or a control dentin specimen (D) were installed in gold inlays, which were placed in the inlay cavities and left for 3, 7 or 21 d. As a consequence, 4 mm of the surface of each specimen was exposed to the environment of the periodontal pocket. After each test period, the specimens were removed from the inlays and examined by scanning electron microscopy (SEM). The results suggested that S is a more suitable dental implant material than P from the viewpoint of clinical application because of its lower degree of plaque accumulation.