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      The measurement of toothbrush wear.

      1 , , ,
      Journal of dental research
      SAGE Publications

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          Abstract

          Toothbrushes wear out and progressively lose their ability to clean as the bristles abrade and become curled and matted. To study the factors that influence this process, we developed a quantitative measure of bristle splaying (wear index) and a method for judging and ranking the overall state of brush deterioration (wear rating) and used these to determine the effects of the individual user, brush design, time in use, and bristle material. Wear index is the average increase in brush-head dimensions normalized for maximum bristle length, and is dimensionless. Wear rating is a subjective means of classifying the increasing severity of deterioration on a scale of 0 to 3. The wear characteristics of a variety of commercial and experimental brushes with different design features were determined. Test variables were time in use, brush design (e.g., geometry and size of the brush head), and bristle composition. Time of use, the individual user, and bristle composition were found to have the strongest influences on splaying, and brush design was found to have the least influence. The wear index offers a quantitative means of comparing brushes of different dimensions at various stages of splaying. The wear rating, although qualitative, is a quick means of ranking brushes in various stages of deterioration. The two methods correlate (R2 = 0.87), and both are sensitive to several factors that affect brush durability. Therefore, these methods appear to be suitable not only for research, but also for quality control, the setting of standards, and for substantiation of advertising claims.

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          Author and article information

          Journal
          J Dent Res
          Journal of dental research
          SAGE Publications
          0022-0345
          0022-0345
          Dec 1989
          : 68
          : 12
          Affiliations
          [1 ] Gillette Company, Boston Research & Development, Gillette Park, Massachusetts 02106-2131.
          Article
          10.1177/00220345890680121201
          2600261
          c5035e36-1b3b-452e-8660-75ab56d74539
          History

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