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

Autor(es)

Joao-Souza, Samira Helena ^[1] ; Scaramucci, Tais ^[2] ; Hara, Anderson T. ^[3] ; Correa Aranha, Ana Cecilia ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Special Lab Lasers Dent LELO, Dept Restorat Dent, Sch Dent, BR-05508000 Sao Paulo, SP - Brazil

^[2] Univ Sao Paulo, Dept Restorat Dent, Sch Dent, BR-05508000 Sao Paulo, SP - Brazil

^[3] Indiana Univ, Sch Dent, Oral Hlth Res Inst, Dept Prevent & Community Dent, Indianapolis, IN - USA

• Tipo de documento: Artigo Científico
• Fonte: Lasers in Medical Science; v. 30, n. 9, p. 2273-2279, DEC 2015.
• Citações Web of Science: 7

Resumo

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; similar to 41.66 J/cm(2); 10 Hz; 40 s; in contact), Nd:YAG2 (0.7 W; 70 mJ; similar to 62.50 J/cm(2); 10 Hz; 40 s; in contact), Nd:YAG3 (1 W; 100 mJ; similar to 54,16 J/cm(2); 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, 6x/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. (AU)

• Processo FAPESP: 12/20632-9 - Análise da progressão de lesões de erosão após irradiação com Laser de Nd:YAG
• Beneficiário: Samira Helena Niemeyer
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 11/17699-1 - Análise da progressão de lesões de erosão após irradiação com Laser de Nd:YAG
• Beneficiário: Ana Cecília Corrêa Aranha
• Modalidade de apoio: Auxílio à Pesquisa - Regular