漂白したエナメル質の微小硬さと表面粗さに及ぼすフッ化物ゲルの影響

Effect of fluoride gels on microhardness and surface roughness of bleached enamel.

• Ana L P China
• Nayara M Souza
• Yasmin do S B de L Gomes
• Larissa D Alexandrino
• Cecy M Silva

抄録

カルシウムを添加し，中性または酸性のフッ化物ゲルと組み合わせた漂白処理が歯のエナメル質に及ぼす影響を，Knoopマイクロハードネス（KHN）および表面粗さ（SR）の測定を通じてin vitroで調べた．SR測定用の30本とKHN測定用の30本を含む，合計60本のウシの切歯を試験した．試験片を12グループに分け，過酸化水素35%の漂白剤（Whiteness HP 35% Maxx，FGM）またはカルシウムを含む過酸化水素35%の漂白剤（Whiteness HP 35% Blue Calcium，FGM）と，フッ化物処理（フリューゲル酸性リン酸塩フッ化物（APF）またはフリューゲル中性フッ化物（NF））を行った．対照試料は，フッ化物を含まない漂白処理を行った。微小硬さ試験は，ヌープ圧子を用いて行った。粗さの測定は粗さ分析器を用いて行った。測定は処理前と処理後に行った。試験片は処理の間、37℃の蒸留水で保存した。結果は，記述統計および推論統計を用いて分析した。APFと35％のHPを併用した治療では，マイクロハードネスが低下したが，NFと35％のHP Caを併用した治療では，エナメル質の硬度が上昇した．フッ素ゲルは漂白したエナメル質のSRを変化させなかった。

The effect of bleaching treatments containing added calcium and combined with neutral or acidic fluoride gels on tooth enamel was investigated in vitro through Knoop microhardness (KHN) and surface roughness (SR) measurements. A total of 60 bovine incisors were tested, including 30 for SR measurements and 30 for KHN measurements. The specimens were divided into 12 groups and subjected to a bleaching agent with hydrogen peroxide 35% (Whiteness HP 35% Maxx, FGM) or hydrogen peroxide 35% with calcium (Whiteness HP 35% Blue Calcium, FGM) and a fluoride treatment flugel acidulated phosphate fluoride (APF) or flugel neutral fluoride (NF). Control specimens were submitted to bleaching treatments without fluoride. Microhardness tests were performed using a Knoop indentor. Roughness measurements were obtained using a roughness analyzer. Measurements were obtained before and after treatment. The specimens were stored in distilled water at 37 °C between treatments. The results were analyzed using descriptive and inferential statistics. Treatments using APF combined with 35% HP caused a decrease in microhardness, while NF combined with HP 35% Ca increased the enamel hardness. Fluoride gels did not alter the SR of the bleached enamel.