The effect of CO2 9.3 μm short-pulsed laser irradiation in enamel erosion reduction with and without fluoride applications—a randomized, controlled in vitro study
| Autor: | Patricia Moreira de Freitas, Yael Engel, Camila Vieira da Silva, Juliane de Paula Tavares, Taís Fonseca Mantilla, Peter Rechmann |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Enamel paint Scanning electron microscope Pulse duration 030206 dentistry Dermatology Laser Fluence law.invention 030207 dermatology & venereal diseases 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine chemistry law visual_art visual_art.visual_art_medium Surgery Irradiation Citric acid Fluoride Nuclear chemistry |
| Zdroj: | Lasers in Medical Science. 35:1213-1222 |
| ISSN: | 1435-604X 0268-8921 |
| DOI: | 10.1007/s10103-020-02979-3 |
| Popis: | The aim of this in vitro study was to evaluate the protective effect of short-pulsed CO2 9.3 μm laser irradiation against erosion in human enamel without and combined with TiF4 and AmF/NaF/SnCl2 applications, respectively, as well as compared to the protective effect of these fluoride treatments alone. After polishing, ninety enamel samples (3 × 3mm) were used for 9 different treatment groups: 4% TiF4 gel (pH 1.5, 24,533 ppm F−); AmF/NaF/SnCl2 rinse (pH 4.5; 500 ppm F−, 800 ppm Sn2); CO2 laser (average power 0.58 W); CO2 laser (0.58 W) + TiF4; CO2 laser (0.58 W) + AmF/NaF/SnCl2; CO2 laser (0.69 W); CO2 laser (0.69 W) + TiF4; CO2 laser (0.69 W) + AmF/NaF/SnCl2; negative control (deionized water). TiF4 gel was brushed on only once before the first erosive cycling, while samples treated with AmF/NaF/SnCl2 were daily immersed in 5 ml of the solution before cycling. Laser treatment occurred with a CO2 laser (wavelength 9.3 μm, pulse repetition rate 100 Hz, pulse duration 14.6 μs/18 μs, average power 0.58 W/0.69 W, fluence 1.9 J/cm2/2.2 J/cm2, beam diameter 0.63 mm, irradiation time 10 s, air cooling). TiF4 was applied only once, while AmF/NaF/SnCl2 was applied once daily before the erosive challenge. Surface loss (in μm) was measured with optical profilometry immediately after treatment, and after 5 and 10 days of erosive cycling (0.5% citric acid, pH 2.3, 6 × 2 min/day). Additionally, scanning electron microscopy investigations were performed. All application measures resulted in loss of surface height immediately after treatment. After 5 days, significantly reduced surface loss was observed after applying laser irradiation (both power settings) followed by applications of TiF4 or AmF/NaF/SnCl2 solution (p |
| Databáze: | OpenAIRE |
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