Effect of sodium fluoride and stannous chloride associated with Nd:YAG laser irradiation on the progression of enamel erosion

Author(s)

Joao-Souza, Samira Helena ^[1] ; Cardoso Bezerra, Savio Jose ^[2] ; Borges, Alessandra Buehler ^[3] ; Aranha, Ana Cecilia ^[1] ; Scaramucci, Tais ^[2]

Affiliation

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

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

^[3] Univ Estadual Paulista, Dept Restorat Dent, BR-12245000 Sao Jose Dos Campos, SP - Brazil

• Document type: Journal article
• Source: Lasers in Medical Science; v. 30, n. 9, p. 2227-2232, DEC 2015.
• Web of Science Citations: 5

Abstract

This study evaluated the progression of enamel erosion after treatment with gels containing sodium fluoride (NaF; 9047 ppm F) and stannous chloride (SnCl2; 3000 ppm Sn), associated or not with Nd:YAG laser irradiation. Sixty enamel specimens were prepared from bovine incisors and protected by a tape, leaving an exposed surface area of 4 x 1 mm. The specimens were immersed in 1 % citric acid (pH = 2.3) for 10 min to create an initial erosion lesion. After, they were randomly divided into six groups: (C) control: gel without active ingredient; (F): NaF gel; (F + Sn): NaF + SnCl2 gel; (laser): Nd:YAG laser irradiation (0.5 W; 50 mJ; similar to 41.66 J/cm(2); 10 Hz; 40 s); (F + laser): NaF gel + Nd:YAG; (F + Sn + laser): NaF + SnCl2 gel + Nd:YAG. All gels had pH = 4.5 and were applied for 1 min. Laser irradiation was performed after gel application. The specimens were then submitted to a 5-day erosion-remineralization cycling model using 1 % citric acid (pH = 2.3), six times per day. Enamel surface loss (SL) was analyzed by optical profilometry in the end of the cycling (in mu m). Data were analyzed by one-way ANOVA and Holm-Sidak tests (alpha = 0.05). The control and the laser groups presented the highest enamel loss (means +/- SD = 53.52 +/- 3.65 and 53.30 +/- 2.73, respectively), followed by F + Sn (44.76 +/- 2.83). The groups F (36.76 +/- 2.28), F + laser (36.25 +/- 3.59), and F + Sn + laser (39.83 +/- 4.62) showed the lowest enamel loss, with no significant difference among them (p > 0.05). In conclusion, NaF by itself or associated with SnCl2 and Nd:YAG laser was able to reduce enamel erosion progression. Nd:YAG laser alone did not show a protective effect. (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
• FAPESP's process: 14/14055-4 - In situ evaluation of the anti-erosive effect of solutions containing sodium fluoride, stannous chloride and linear chain sodium polyphosphate
• Grantee: Taís Scaramucci Forlin
• Support Opportunities: Regular Research Grants