Effect of Low-level Laser Therapy on Neurosensory Disorders Recovery following the Bilateral Sagittal Split Ramus Osteotomy
Mohamad T Kiani, Bahman Derakhshan, Mina Abasi, Shahrooz Shafahifard, Mohammad J Kharazifard
Citation Information :
Kiani MT, Derakhshan B, Abasi M, Shafahifard S, Kharazifard MJ. Effect of Low-level Laser Therapy on Neurosensory Disorders Recovery following the Bilateral Sagittal Split Ramus Osteotomy. Int J Laser Dent 2015; 5 (2):43-49.
Introduction: Bilateral sagittal split osteotomy (BSSO) is a technique commonly used to correct mandibular disproportions, while neurosensory disorders are common following this technique. Low-level laser irradiation has shown promising results to relieve the neurosensory disorders of BSSO technique.
Objective: The aim of this study was to compare the effects of low-level laser irradiation on the neurosensory complications related to the BSSO technique.
Materials and methods: In this prospective, double-blinded clinical trial, 13 patients candidate for BSSO surgery were selected and went under complete clinical neurosensory tests (CNTs) including brush stroke discrimination; two-point discrimination; and contact, thermal, and pinprick discrimination, as well as visual analog scale (VAS) assessments. The laser GaAlAs (820–830 ìm wavelength) irradiation was done for total six sessions after surgery for the patients at one side accidentally, and the opposite site was a control by irradiation of placebo. The values of CNT assessments between the experimental and control sites were analyzed employing Wilcoxon signed-rank test.
Results: Higher values of VAS and brush stroke discrimination test were observed in the laser-irradiated sites than in the control sites, although without any significant differences (p > 0.05). Moreover, significantly higher values of pinprick discrimination test were noted in the experimental sites on days 1, 2, 3, 4, 7, 14, 28, and 60 (p < 0.05). The thermal test results were higher in the study sides, and the differences of both sides were significant on days 2, 3, 4, 7, 14, and 28 (p < 0.05).
Conclusion: In total, GaAlAs low-level laser irradiation after the BSSO surgery results in both subjective and objective improvements regarding the time and magnitude of return of function; however, in some tests no significant differences were found between laser-irradiated and control areas.
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