様々な過酸化水素濃度を持つホワイトニング歯磨き粉を使用した象牙質摩滅

Dentin abrasion using whitening toothpaste with various hydrogen peroxide concentrations.

抄録

目的:

過酸化水素の濃度を変えた4種類のホワイトニング歯磨き粉、2種類の従来の歯磨き粉、7種類の実験用歯磨き粉の磨耗量を比較する。

PURPOSE: To compare the amount of abrasion of four whitening toothpastes, two conventional toothpastes, and seven experimental toothpastes with varying concentrations of hydrogen peroxide.

方法:

牛歯象牙質を4種類のホワイトニング歯磨き粉（0.75%、1.50%、2.80%の3種類の濃度の過酸化水素を含む）、過酸化水素を含まない2種類の従来の歯磨き粉、7種類の実験用歯磨き粉（過酸化水素濃度：0.75%, 1.50%, 3.0%, 4.50%, 6.0%, 7.50%, 9%）および蒸留水で処理しました。10,000回の歯ブラシを行った後、象牙質表面の摩耗量を非接触型3D表面形状測定装置で測定した（n= 8）。すべての溶液のpH、粒子の重量％、歯磨き粉に含まれる粒子の成分を分析した。また，象牙質摩耗量，pH，歯磨剤中の粒子の重量割合の相関を検討した．

METHODS: Bovine dentin specimens were treated with the four whitening toothpastes (containing three different concentrations of hydrogen peroxide: 0.75%, 1.50%, and 2.80%), two conventional toothpastes without hydrogen peroxide, seven experimental toothpastes (concentrations of hydrogen peroxide: 0.75%, 1.50%, 3.0%, 4.50%, 6.0%, 7.50%, and 9.0%), and distilled water. After 10,000 strokes of toothbrushing, the amount of abrasion on the dentin surface was measured with a contactless 3D surface profiler (n= 8). The pH of all solutions, the weight percentages of the particles, and the component of particles in the toothpaste were analyzed. The correlations between the dentin abrasion, pH, and weight percentages of the particles in the toothpastes were investigated.

結果:

従来型歯磨剤2種の摩耗量は，美白歯磨剤4種の摩耗量の1.1～3.6倍であった．同様に，従来型歯磨剤のpHは，他の美白歯磨剤よりも高かった．4種類の美白歯磨き粉の間には有意な差は見られなかった。つの美白歯磨きは，2つの従来歯磨きに比べて，比較的低い重量割合の粒子から構成されていた。象牙質摩耗量と粒子の重量割合の間には強い正の相関が認められた（r= 0.913; P< 0.05）。さらに，7種類の実験用歯磨剤で処理した試料と蒸留水で処理した試料との間には，摩耗量に有意な差は認められなかった．

RESULTS: The amount of abrasion of the two conventional toothpastes were 1.1-3.6 times higher than those of the four whitening toothpastes. Likewise, the pH of the conventional toothpaste was higher than those of the other whitening toothpastes. No significant differences were found among the four whitening toothpastes. The four whitening toothpastes consisted of a relatively lower weight percentage of particles compared to the two conventional toothpastes. A strong positive correlation was observed between the dentin abrasion and the weight percentages of the particles (r= 0.913; P< 0.05). Furthermore, no significant differences in the amount of abrasion were observed between the specimens treated with seven experimental toothpastes and those treated with distilled water.

臨床的意義:

9%未満の過酸化水素を含むホワイトニング歯磨き粉は、象牙質表面を大きく傷つけることはないようであった。これらの知見は、消費者、患者、歯科専門家にとって参考となるものである。

CLINICAL SIGNIFICANCE: The whitening toothpastes containing less than 9% hydrogen peroxide did not seem to harm the dentin surface significantly. These findings can serve as a reference for consumers, patients, and dental professionals.