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Related Experiment Videos

Bristle end-rounding in children's toothbrushes: a comparative study

H R Rawls1, R van Gelder, N K Smith

  • 1University of Texas Health Science Center, San Antonio.

The Journal of Clinical Dentistry
|January 1, 1993
PubMed
Summary

Children's toothbrush bristles vary in end-roundness, impacting oral tissue injury potential. Oral-B P20 demonstrated the lowest risk, while Johnson & Johnson Reach Child and Butler GUM Jr. posed the highest risk for gingival damage.

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Area of Science:

  • Dental hygiene
  • Biomaterials science
  • Oral health

Background:

  • Sharp toothbrush bristles can cause gingival tissue injury.
  • Significant variations in bristle end-roundness exist among commercial toothbrushes.
  • Assessing bristle end-roundness is crucial for evaluating potential oral tissue damage.

Purpose of the Study:

  • To evaluate the relative potential for oral tissue injury among eight brands of children's toothbrushes.
  • To compare the degree of end-roundness of toothbrush bristles across different brands.
  • To identify toothbrushes with the lowest risk of causing gingival damage.

Main Methods:

  • Eight brands of children's toothbrushes were analyzed.
  • Bristle ends were assessed for the percentage of sharp ends (≤89% roundness) and smooth edges (≥96% roundness).

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  • Average bristle end roundness was calculated for each brand.

    • Main Results:

    • Oral-B P20 exhibited a significantly higher percentage of smooth-edged bristles (≥96% roundness) and the highest average roundness.
    • Oral-B P20 had the lowest proportion of sharp-edged bristles.
    • Johnson & Johnson Reach Child and Butler GUM Jr. showed the highest potential for oral tissue injury.

    Conclusions:

    • Bristle end-roundness is a key factor in determining a toothbrush's potential for causing oral tissue damage.
    • Oral-B P20 is recommended for children due to its superior bristle end-rounding and lower injury potential.
    • Further research into toothbrush design and material properties can enhance oral safety.