A randomized placebo-blind study of the effect of low power laser on pain caused by irreversible pulpitis

Author(s)

Ramalho, Karen Muller ; Paladini de Souza, Larissa Marcondes ; Tortamano, Isabel Peixoto ; Adde, Carlos Alberto ; Rocha, Rodney Garcia ; Eduardo, Carlos de Paula

• Document type: Journal article
• Source: Lasers in Medical Science; v. 31, n. 9, p. 1899-1905, DEC 2016.
• Web of Science Citations: 2

Abstract

This randomized placebo-blind study aimed to evaluate the effect of laser phototherapy (LPT) on pain caused by symptomatic irreversible pulpitis (SIP). Sixty patients diagnosed with SIP were randomly assigned to treatment groups (n = 15): G1 (control), G2 (laser placebo-sham irradiation), G3 (laser irradiation at 780 nm, 40 mW, 4 J/cm(2)), and G4 (laser irradiation at 780 nm, 40 mW, 40 J/cm(2)). Spontaneous pain was recorded using a VAS score before (T0), immediately after (T1), and 15 min after treatment (T2). Local anesthetics failure during emergency endodontic treatment was also assessed. There was no pain difference in T1 and T2 between the experimental laser groups (G3 and G4) and the placebo group (G2). The 4-J/cm(2) (G3) irradiation resulted in significant increase in the local anesthetics failure in lower jar teeth. This effect could be suggested as consequence of the LPT improvement in local circulation and vasodilatation that would result in the increase of local anesthetic agent absorption. The application of 780-nm diode laser irradiation, at 4 and 40 J/cm(2), showed no effect in reducing the pain in SIP in comparison to the placebo group. The fluence of 4 J/cm(2) showed a negative effect in local anesthetics, resulting in significant increase of complimentary local anesthesia during emergency endodontic treatment. This work provides evidence of the consequence of LPT application on teeth with symptomatic irreversible pulpitis. LPT should be avoided in teeth with pain due to irreversible pulpitis. (AU)

• FAPESP's process: 12/21670-1 - Evaluation of the analgesic effect of the low intensity laser in patients with acute pulpits: randomized study, double-blinded
• Grantee: Lárissa Marcondes Paladini de Souza
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 13/12317-9 - Evaluation of the photodynamic therapy in the treatment of Herpes Labialis. An in vivo, randomized and blind study.
• Grantee: Karen Muller Ramalho
• Support Opportunities: Scholarships in Brazil - Post-Doctoral