Measurement of toothpaste abrasion

Anders LiljeborgGunnar Johannsen

Earlier measurements

HeNe laser

Plexi-sample

Photo diode

Voltmeter

Surface profilometer, KLA-Tencor P15

Diamond stylus, 2 micron radius

Vertical resolution a few nanometers

117 mm

25 mm

20 mm 20 mmBlank profile

Center profile, 2000 points

Center, +20mm and -20mm profiles

Nonflat plexi surface

Compensated by fit of 3:rd order polynomial to 50 first and last points

Comparison with “blank” profile at lower end of plexi sample,note bad fit to the left, good fit to the right.

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

-30.00 -25.00 -20.00 -15.00 -10.00 -5.00 0.000

25000

50000

75000

100000

125000

150000

175000

200000

225000

250000

Area vs. Depth

Depth [um]

Are

a [u

m̂2]

-30.00 -25.00 -20.00 -15.00 -10.00 -5.00 0.000.00

1.00

2.00

3.00

4.00

5.00

6.00

7.00

8.00

9.00

10.00

Volume vs. Depth

Depth [um]

Vol

ume

[mm̂

3]

-30.00 -25.00 -20.00 -15.00 -10.00 -5.00 0.000.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

5.00

5.50

6.00

RA vs. Depth

Depth [um]

RA

[um

]