JP5005373B2 - 齲蝕活性評価用の歯垢染色用組成物 - Google Patents
齲蝕活性評価用の歯垢染色用組成物 Download PDFInfo
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Description
この齲蝕の活性評価に用いられる組成物としては、特定の範囲内に変色域を持つpH指示薬と糖とを含む水溶液が一般的である。その作用は、採取した歯垢を水溶液に接触させると歯垢内に存在する細菌が糖を代謝し、結果として歯垢から酸が放出されて水溶液のpHが低下し、水溶液のpHが水溶液中に含まれるpH指示薬の変色点よりも下がると水溶液の色調が変化することを利用して齲蝕の活性を評価するものである(例えば、特許文献13〜19参照。)。
しかしながら、このホワイトスポット検出用歯垢染色剤は、色調変色点がpH4〜7にある色素自体の色調変化でホワイトスポットの有無(齲蝕の活性評価)を判断しなければならないので厚い歯垢の場合には色による正確な評価が難しく正確に評価できないという問題があった。
即ち、赤系色素が薄い歯垢も厚い歯垢も染色し、一方で青系色素が厚い歯垢を染色するという特徴(米国特許第3997658号参照。)を利用し、従来の歯垢染色用の色素と糖とを含み歯垢内に存在する細菌によって糖を代謝させる歯垢染色用組成物において、水に溶解しpH7以下で色調が変化しない青系色素とpH4.5を超えると水に溶解するがpH4.5以下では水に溶解せず色調が変化しない赤系色素とを糖に配合すると、糖の代謝前のpHでは赤系色素と青系色素との両方で比較的厚い歯垢を染色し、糖を代謝してpH4.5以下になった部位では赤系色素が水に溶解せずに口腔内から洗い流されることによって赤系色素では歯垢を染色しない状態にすることができること、このような糖の代謝前後の赤系色素の染色状態の変化を利用すれば、赤色と青色とが合わさった紫色の染色状態と、pHの変化により赤色が抜けた場合の青色の場合との組み合わせによって厚い歯垢でも正確に歯垢の染色と齲蝕の活性評価を行うことが可能であることを究明したのである。
液状として用いる場合には、水及び/又はアルコールを混合して調製することで作製でき、ペースト状として用いる場合には、水及び/又はアルコールと増粘剤とを混合して調製することで作製でき、タブレット状として用いる場合には、後述する増粘剤の結晶セルロース,カルボキシメチルセルロース,ヒドロキシプロピルセルロース等を結合剤として調製することができる。
前述した増粘剤による好ましい粘度範囲を、25℃に於いて0.5〜5Pa・sに設定したのは使い勝手に関する種々の実験の結果からであり、即ち、0.5Pa・s未満ではペースト状とする効果が得られ難く、5Pa・sを超えると歯牙への付着性が低下する傾向がある。この範囲の粘度を得るための増粘剤の配合量は増粘剤の種類により様々であるが、例えば増粘効果の大きいカルボキシメチルセルロースナトリウムなどでは0.2〜12重量%程度で良く、メチルセルロースなどでは5〜65重量%の配合量が必要である。このように適当な配合量は各増粘剤毎個別に定められる。
表1に示した配合で実施例の組成物を作製し、下記の試験を行い評価した。結果を纏めて表1に示す。
実施例1〜5の齲蝕活性評価用の歯垢染色用組成物を被験者が口腔内の歯牙全体に筆で塗布した。その後、大凡5分間経過後に軽く洗口させてから被験者の口腔内を観察したところ歯垢内の細菌によってpHが4.5以下になった部位では赤系色素が析出し流出したことにより厚い歯垢部の色が紫から青への変化した部位を認めることができた。即ち、厚い歯垢部において青く変色した部位の齲蝕の活性が高いことが分かった。
Claims (3)
- 水に溶解しpH7以下で色調が変化しない青系色素と、pH4.5を超えると水に溶解するがpH4.5以下では水に溶解せず色調が変化しない赤系色素と、糖とを含む齲蝕活性評価用の歯垢染色用組成物。
- 青系色素が青色1号(ブリリアントブルーFCF),緑色3号(ファストグリーンFCF)の1種又は2種の組み合わせであり、赤系色素が赤色3号(エリスロシン),赤色104号(フロキシン),赤色105号(ローズベンガル),赤色106号(アシッドレッド)の1種又は2種以上の組み合わせである請求項1に記載の齲蝕活性評価用の歯垢染色用組成物。
- 青系色素と赤系色素との含有量の和1重量部に対して、糖の含有量が1〜50重量部であり、青系色素と赤系色素との含有量の割合が1:3〜3:1である請求項1又は2に記載の齲蝕活性評価用の歯垢染色用組成物。
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