In vitro CO2 9.3-μm short-pulsed laser caries prevention—effects of a newly developed laser irradiation pattern

Caries prevention with different lasers has been investigated in laboratory studies and clinical pilot trials. Objective of this in vitro study was to assess whether 9.3-μm microsecond short-pulsed CO 2 laser irradiation enhances enamel caries resistance without melting, with and without additional...

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Bibliographic Details
Published in:Lasers in medical science 2020-06, Vol.35 (4), p.979-989
Main Authors: Rechmann, Peter, Le, C. Q., Kinsel, R., Kerbage, C., Rechmann, B. M. T.
Format: Article
Language:English
Subjects:
Carbon dioxide
Carbon dioxide lasers
Clinical trials
Dental caries
Dental enamel
Dentistry
Enamel
Fluence
Fluorides
Irradiation
Laboratories
Laser beams
Lasers
Loss reduction
Medicine
Medicine & Public Health
Melting
Microhardness
Optical Devices
Optics
Original Article
Photonics
Prevention
Pulse duration
Pulse repetition rate
Pulsed lasers
Quantum Optics
Scanning electron microscopy
Variance analysis
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Summary:Caries prevention with different lasers has been investigated in laboratory studies and clinical pilot trials. Objective of this in vitro study was to assess whether 9.3-μm microsecond short-pulsed CO 2 laser irradiation enhances enamel caries resistance without melting, with and without additional fluoride application. Seven groups of enamel, totaling 105 human enamel samples, were irradiated with 2 different carbon dioxide lasers with 2 different energy application systems (original versus spread beam; 9.3 μm wavelength, pulse repetition rate 43 Hz vs 100 Hz, fluence ranges from 1.4 to 3.9 J/cm 2 , pulse duration 3 μs to 18 μs). The laboratory pH-cycling was performed with or without additional fluoride, followed by cross-sectional microhardness testing. To assess caries inhibition, the mean relative mineral loss delta Z (∆Z) was determined. To evaluate for melting, scanning electron microscopy (SEM) examinations were performed. For the non-laser control groups with additional fluoride use, the relative mineral loss (ΔZ, vol% × μm) ranged between 512 ± 292 and 809 ± 297 (mean ± SD). ΔZ for the laser-irradiated samples with fluoride use ranged between 186 ± 214 and 374 ± 191, averaging a 58% ± 6% mineral loss reduction (ANOVA, P  
ISSN:0268-8921
1435-604X
DOI:10.1007/s10103-019-02940-z