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歯ブラシの摩耗性を長期的にシミュレーションした結果，歯ブラシの摩耗性はブラッシングモードと毛の配置に依存することがわかった．
Toothbrush abrasivity in a long-term simulation on human dentin depends on brushing mode and bristle arrangement.
PMID: 28222156 PMCID: PMC5319671. DOI: 10.1371/journal.pone.0172060.
抄録
目的:
本研究の目的は、4種類の歯ブラシ（回転振動歯ブラシ、音波歯ブラシ、2種類の手動歯ブラシ）を用いて、同じブラッシング力でブラッシング摩耗に対する象牙質の感受性を評価することであった。
OBJECTIVE: The aim of this study was to evaluate the susceptibility of dentin to brushing abrasion using four different toothbrushes (rotating-oscillating, sonic and two types of manual toothbrushes) with the same brushing forces.
方法:
METHODS: Dentin samples (n = 72) were selected from 72 impacted third molars. Half of the surface of dentin samples was covered with an adhesive tape, creating a protected and a freely exposed area in the same specimen. Brushing was performed with either a: sonic (Sonicare PowerUp, Philips GmbH, Hamburg, Germany), b: oscillating-rotating (Oral B Vitality Precisions Clean, Procter & Gamble, Schwalbach am Taunus, Germany) or two different manual toothbrushes c: flat trim brush head toothbrush (Dr. Best: Original, Glaxo-Smith-Kline, Bühl, Germany) and d: rippled-shaped brush head toothbrush (Blend-a-Dent, Complete V-Interdental, Blend-a-med, Schwalbach, Germany) in a custom made automatic brushing machine. The brushing force was set to 2 N and a whitening toothpaste (RDA = 150) was used. The simulation period was performed over a calculated period to mimic a brushing behavior of two times a day brushing for eight years and six months. Dentin loss was quantitatively determined by profilometry and statistically analyzed by Wilcoxon and Mann-Whitney-U Test (p < 0.05).
結果:
平均（標準偏差）表面損失は、音波歯ブラシが21.03（±1.26）μm、振動回転歯ブラシが15.71（±0.85）μm、波紋状ブラシヘッド付き手動歯ブラシが6．13(±1.24)μm，平型トリムブラシヘッドの手動歯ブラシは2.50(±0.43)μmであった．すべてのグループ間の差は、p<0.05で統計的に有意であった。
RESULTS: The mean (standard deviation) surface loss was 21.03 (±1.26) μm for the sonic toothbrush, 15.71 (±0.85) μm for the oscillating-rotating toothbrush, 6.13 (±1.24) μm for the manual toothbrush with flat trim brush head and 2.50 (±0.43) μm for the manual toothbrush with rippled-shaped brush head. Differences between all groups were statistically significant at p<0.05.
結論:
同じブラッシング力と研磨性の高い歯磨き粉を使用して、8.5年間のシミュレーションでは、手動歯ブラシはパワー歯ブラシに比べて有意に研磨性が低いことがわかりました。
CONCLUSION: Using the same brushing force and a highly abrasive toothpaste, manual toothbrushes are significantly less abrasive compared to power toothbrushes for an 8.5-year simulation.