Scientific article
Open access

An In Vitro Evaluation of the Effects of Air-Polishing Powders on Sound and Demineralised Enamel

Published inMaterials, vol. 16, no. 13, 4811
Publication date2023-07-04
First online date2023-07-04

Aim: To evaluate the effects of two air-polishing powders, during orthodontic treatment, on the surface roughness of sound and demineralised enamel.

Materials and methods: Forty-two caries-free human molars were collected, and the enamel surfaces were flattened and polished. Teeth were assigned to two groups (n = 21 each), a sound- and a demineralised-enamel group (subjected to pH-cycling over 2 weeks to create artificially induced white spot-like lesions). Within each group, teeth were further assigned to three groups (n = 7 each), air polished with either sodium bicarbonate, erythritol, or a negative control (water). Each sample was treated for 5 and 150 s. The average surface roughness (Ra) for each sample was measured using white-light-sensor profilometry.

Results: On sound enamel, the Ra was roughly 0.17 ± 0.07 μm. After 150 s of air polishing, the Ra increased with erythritol (by 0.28 μm), and even more so with bicarbonate treatment (by 0.68 μm) (p < 0.01). On demineralised enamel, the Ra was roughly 0.79 ± 0.56 μm. The Ra increased after 5 s of air-polishing treatment similarly with erythritol and bicarbonate powders (by 1.03 μm and 1.04 μm, respectively) (p = 0.025), and even more after 150 s (by 2.48 μm and 2.49 μm, respectively) (p < 0.001).

Conclusions: On white spot lesions, one should be aware that enamel surface roughness will increase with both erythritol and bicarbonate air-polishing powders, especially with longer exposure times.

  • Air polishing
  • Bicarbonate
  • Demineralised enamel
  • Enamel
  • Erythritol
  • Orthodontics
  • Surface roughness
  • White spot lesions
Citation (ISO format)
GUMA, Elton et al. An In Vitro Evaluation of the Effects of Air-Polishing Powders on Sound and Demineralised Enamel. In: Materials, 2023, vol. 16, n° 13, p. 4811. doi: 10.3390/ma16134811
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Article (Published version)
ISSN of the journal1996-1944

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