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

Author(s)

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

Affiliation

^[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

• Document type: Journal article
• Source: Lasers in Medical Science; v. 30, n. 9, p. 2273-2279, DEC 2015.
• Web of Science Citations: 7

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; 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)

• FAPESP's process: 12/20632-9 - Analysis of the progression of erosion lesions after Nd:YAG irradiation
• Grantee: Samira Helena Niemeyer
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 11/17699-1 - Progression of dental erosion after Nd:YAG laser irradiation
• Grantee: Ana Cecília Corrêa Aranha
• Support Opportunities: Regular Research Grants