Resumo

PINHEIRO, Sergio Luiz; AGUSTINHO, Maria Madalena Silva; MARTIN, Alexandre Sigrist De  e  BUENO, Carlos Eduardo da Silveira. Effect of low level laser for pain relief after the first orthodontic archwire's placement. Rev. Assoc. Paul. Cir. Dent. [online]. 2015, vol.69, n.4, pp. 421-425. ISSN 0004-5276.

Objective: The aim of this study was to clinically evaluate Low Level Laser Therapy (LLLT) as a method of reducing pain after the first orthodontic archwire placement. Materials and Methods: 90 volunteers received metal braces and the first archwire. They were randomly distributed over three different treatment groups: Group 1- (n=30) Control, patients did not received any LLLT; Group 2- (n=30) Placebo, the LLLT was simulated, the laser was turned off; Group 3- (n=30) Laser patients received LLLT, infra-red with 810 nm wave length and 100 mW power, and it was used 6 J/cm2 as total dose per tooth, divided into four times of 1.5 J/cm2 per 12 seconds per point. Pain intensity experienced was evaluated by a Visual Analogue Scale. Data were tabulated and analyzed through Biostat 4.0 software. Means and standard deviations were calculated and a Kruskal-Wallis statics test was performed (Dunn's method) (α=0.05). Results: It was possible to observe that the pain started 2 hours after treatment was initiated in the three groups. Higher pain levels occurred between 12 and 48 hours, and pain reduction occurred in 7 days. Group 3 (Laser) presented lower pain data values than the other groups. There was a statistically significant difference (p<0.05) among post operating pain in times T3, T4 and T5 between group 3 and groups 1 and 2. Conclusion: LLLT reduced the pain after orthodontics braces and archwires placement.

Palavras-chave : laser therapy; low-level; orthodontics; dental arch.