PROBLEM TO BE SOLVED: To manufacture a toothbrush which efficiently brushes a deep surface and a back surface of a last molar which are most likely to develop dental decays and are hardest to brush by normal brushing and a periodontal pocket between gums and dental enamel located below the last molar and can remove dental plaque.SOLUTION: A neck part in a toothbrush handle is made to be thin so that a brush part accurately reaches a deep surface and a back surface of a last molar and is simultaneously curved in two parts by considering a shape of an inside of an oral cavity. Next, elasticity is imparted to the neck part to fit a tooth surface for improving performance of removing tooth plaque. The brush part has one to three rows of bristle bundles and a T shape to brush a wide range by one brushing.COPYRIGHT: (C)2015,JPO&INPIT【課題】最も虫歯になりやすく、通常のブラッシングにおいて最も磨くことが難かしいとされる最後臼歯奥面と裏面その下部に位置する歯肉とエナメル質間の歯周ポケット部を効率よく磨き、歯垢除去可能な歯ブラシ製造を課題とした。【解決手段】最後臼歯奥面と裏面に正確にブラシ部が届くように歯ブラシ柄におけるネック部を細くすると同時に、口腔内形状を考慮し二カ所において湾曲させる構造とした。次に、そのネック部に弾力性を持たせ、歯面にフィットすることで歯垢除去力向上を計った。ブラシ部においても糸束列を1乃至3としT字形状とすることで一度のブラッシングにおいて広範囲が磨けるよう考えた。【選択図】図1
