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Comparative Study
, 8 (3 Spec No), 86-90

Clinical and Laboratory Evaluation of Powered Electric Toothbrushes: Relative Degree of Bristle End-Rounding

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  • PMID: 9238892
Comparative Study

Clinical and Laboratory Evaluation of Powered Electric Toothbrushes: Relative Degree of Bristle End-Rounding

L McLey et al. J Clin Dent.

Abstract

Toothbrush bristles with sharp edges have been postulated to represent a greater threat to dental tissues than end-rounded bristles. This study evaluated the effect of both in vivo and laboratory use on bristle wear rate, tip geometry and in vitro abrasivity. Three soft manual brushes (Oral-B P40, Crest Complete and Butler GUM) and one powered brush (Rota-dent) were tested. The results of this study show that the wear rate varied directly with brushing load and amount of dentifrice, and inversely with bristle diameter. Despite the initial geometry, a flat tip with rounded rims was typically observed after only 30 minutes of manual or Rota-dent brush use. There was no statistical difference in in vitro abrasion for new brushes versus used brushes.

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