Measurement of toothpaste abrasion
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Measurement of toothpaste abrasion
Anders LiljeborgGunnar Johannsen
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Earlier measurements
HeNe laser
Plexi-sample
Photo diode
Voltmeter
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Surface profilometer, KLA-Tencor P15
Diamond stylus, 2 micron radius
Vertical resolution a few nanometers
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117 mm
25 mm
20 mm 20 mmBlank profile
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Center profile, 2000 points
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Center, +20mm and -20mm profiles
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Nonflat plexi surface
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Compensated by fit of 3:rd order polynomial to 50 first and last points
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Comparison with “blank” profile at lower end of plexi sample,note bad fit to the left, good fit to the right.
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File Mean depth [um] M.d. sdev RA [um] RA sdev Area [um 2̂] Area sdev Volume [mm 3̂] Volume sdevacta-pepparmint -23.02 1.44 5.73 0.61 232457 12127 9.27 0.50acta-x -25.19 1.47 4.83 1.25 238600 6734 9.68 0.26apotekets -9.33 0.45 0.84 0.33 90556 4589 3.68 0.17awaguard-990318 -2.74 0.73 0.56 0.12 34637 3642 1.39 0.18bamse -8.82 0.77 0.96 0.26 89042 6222 3.55 0.25bamse-barn-990307 -7.34 0.68 1.20 0.24 74957 6263 2.98 0.22biotene-990322 -16.10 0.92 2.50 0.15 165831 2603 6.73 0.09clinomyn-990323 -9.06 1.25 1.69 0.12 101351 7484 4.24 0.39clinomyn-990409 -17.52 2.28 1.99 0.41 173425 5105 6.91 0.23colgate-total -10.09 0.64 1.35 0.47 104475 6358 4.24 0.18colgate-total-990322 -18.41 3.01 1.77 0.16 180280 11774 7.25 0.44correga-dentogel -0.14 0.08 0.03 0.01 1953 1740 0.09 0.08dentosal-junior-990324 -4.19 0.67 0.66 0.07 45250 8099 1.84 0.39dentosal-original -0.33 2.26 0.19 0.13 24014 13233 0.90 0.38sensodyne-bikarbonat -7.77 0.98 1.25 0.33 77730 7685 3.13 0.36sensodyne-fluor-990326 -5.66 1.92 1.27 0.26 66581 17072 2.70 0.83zendin-dentin-990330 -6.89 0.13 1.34 0.18 67088 2428 2.64 0.08zendin-dentin-990409 -8.25 0.52 0.95 0.52 86843 3745 3.46 0.15zendin-frisk-mun -9.83 0.83 0.87 0.32 97525 5542 3.92 0.25zendin-pepparmint-990324 -6.12 0.19 0.92 0.26 64048 3159 2.55 0.12
RA (Roughness Average) = mean deviation from mean depth value
RA = sum ( abs( mean – y ) ) / length
RA and mean depth computed for center 20% of profile
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-30.00 -25.00 -20.00 -15.00 -10.00 -5.00 0.000
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Area vs. Depth
Depth [um]
Are
a [u
m̂2]
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-30.00 -25.00 -20.00 -15.00 -10.00 -5.00 0.000.00
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Volume vs. Depth
Depth [um]
Vol
ume
[mm̂
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RA vs. Depth
Depth [um]
RA
[um
]