Effect of low-level laser therapy on tooth sensitivity induced by in-office bleaching |
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Authors: | Horieh Moosavi Nooshin Arjmand Farzaneh Ahrari Majid Zakeri Fatemeh Maleknejad |
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Affiliation: | 1.Dental Materials Research Center, School of Dentistry,Mashhad University of Medical Sciences,Mashhad,Iran;2.School of Dentistry,Mashhad University of Medical Sciences,Mashhad,Iran;3.Dental Research Center, School of Dentistry,Mashhad University of Medical Sciences,Mashhad,Iran;4.Private Practice,Mashhad,Iran |
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Abstract: | This study aimed to investigate the effect of low-level laser therapy (LLLT) on tooth sensitivity induced by in-office bleaching. Sixty-six patients enrolled in this randomized clinical trial. Following the in-office procedure with 40 % hydrogen peroxide, the participants were randomly divided into three groups. The patients in group 1 received irradiation from a low-level red laser (LLRL; 660 nm, 200 mW, 15 s, 12 J/cm2), whereas participants in group 2 were subjected to a low-level infrared laser (LLIL; 810 nm) under similar conditions as in group 1. In group 3 (placebo), the laser treatment was the same as that in groups 1 and 2, but without energy output. The degree of tooth sensitivity was recorded at 1, 24, and 48 h after bleaching using a visual analog scale (VAS). The change in tooth shade was measured 30 days after tooth whitening. The intensity of tooth sensitivity was not significantly different between groups at 1 h after bleaching (p?>?0.05). At 24 h after therapy, pain level was significantly lower in the LLIL group compared to the LLRL and placebo groups (p?0.05). At 48 h after bleaching, VAS scores in the LLIL and LLRL groups were comparable to each other (p?>?0.05) and both were significantly lower than that of the placebo group (p?0.05). There was no significant difference in the efficacy of tooth whitening among groups (p?>?0.05). LLLT with an infrared diode laser could be recommended as a suitable strategy to reduce the intensity of tooth sensitivity after in-office bleaching. |
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