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J Dent Res 44(3): 533-540, 1965
© 1965 International and American Associations for Dental Research
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A Method for Measurement of Abrasion of Dentin by Toothbrush and Dentifrice

R. S. MANLY 1, J. WIREN 1, P. J. MANLY 1, and R. C. KEENE 1

1 Westwood Research Laboratory, Westwood, Mass.

A method has been developed for measuring abrasion loss of dentin of human teeth exposed either to hand or to mechanical toothbrushing with dentifrice abrasives. The principle involves recording by an angular position transducer of multiple magnified contours of a tooth at several different locations. These contours are recorded with 20 times enlaraement as six curves on a chart. After the brushing, another set of superimposed curves is obtained, permitting the reading of contour changes at ninety locations on a tooth.

The apparatus was applied to obtain information regarding abrasion with a mechanical toothbrush and water. No appreciable wear was obtained. A comparison was made by means of forty-eight tests on six teeth, between wear by hand brushing and by brushing with a mechanical toothbrush. The mechanical brush produced about two-thirds as much wear as the same duration of hand brushing, under the conditions selected for testing; the difference was statistically significant. Gingival contour and brush hydration appeared to be unimportant influences on extent of wear.

Submitted on March 16, 1964




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