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Lasers in Medical Science
Published in: Lasers in Medical Science 9/2015

01-12-2015 | Original Article

Effect of Nd:YAG laser irradiation and fluoride application in the progression of dentin erosion in vitro

Authors: Samira Helena João-Souza, Tais Scaramucci, Anderson T. Hara, Ana Cecilia Corrêa Aranha

Published in: Lasers in Medical Science | Issue 9/2015

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Abstract

Nd:YAG laser and its association with fluoride have been proposed as an option for the prevention of dental erosion. This study evaluated the progression of existing dentin erosive lesions after treatment with different Nd:YAG laser (1064 nm) protocols, associated or not with fluoride. Erosive lesions were created with 1 % citric acid for 10 min in human dentin specimens. They were randomly assigned into eight groups (n = 15): no treatment (control), 1-min application of 2 % sodium fluoride gel (NaF), Nd:YAG1 (Nd:YAG laser irradiation 0.5 W; 50 mJ; ~41.66 J/cm2; 10 Hz; 40 s; in contact), Nd:YAG2 (0.7 W; 70 mJ; ~62.50 J/cm2; 10 Hz; 40 s; in contact), Nd:YAG3 (1 W; 100 mJ; ~54,16 J/cm2; 10 Hz; 40 s; 1 mm unfocused), NaF + Nd:YAG1, NaF + Nd:YAG2, and NaF + Nd:YAG3. After treatment, the specimens were submitted to a 5-day erosion-remineralization cycling model, 6×/day. Dentin surface loss (SL) was evaluated with optical profilometry after the formation of the initial lesion; after treatment; and after days 1, 3, and 5. Data were statistically analyzed (alpha = 0.05). Significant differences were observed among the groups in all testing times (p < 0.001), except after initial lesion formation. Loss of dentin surface was observed after irradiation with all Nd:YAG laser protocols (p < 0.05). The association fluoride and laser did not differ significantly from laser alone. NaF showed the lowest values of SL and Nd:YAG2 and NaF + Nd:YAG2, the highest. Within the limitations of an in vitro study, it was concluded that laser irradiation, according to the parameters used, was not an appropriated approach to prevent dentin erosion progression, even when it was associated with fluoride.
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Metadata
Title
Effect of Nd:YAG laser irradiation and fluoride application in the progression of dentin erosion in vitro
Authors
Samira Helena João-Souza
Tais Scaramucci
Anderson T. Hara
Ana Cecilia Corrêa Aranha
Publication date
01-12-2015
Publisher
Springer London
Published in
Lasers in Medical Science / Issue 9/2015
Print ISSN: 0268-8921
Electronic ISSN: 1435-604X
DOI
https://doi.org/10.1007/s10103-015-1802-x

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