Systematic Review On Effectiveness Of Low-Level Laser Therapy In The Treatment Of Bell’s Palsy

Abstract

Background: Bell's palsy is a condition characterized by the sudden onset of facial paralysis or weakness, often linked to viral infections such as herpes simplex. Low-level laser therapy (LLLT) has emerged as a potential treatment due to its anti-inflammatory and nerve-regenerative properties. This systematic review evaluates the effectiveness of LLLT in improving outcomes for patients with Bell's palsy.

Objective: The objective of this systematic review was to assess the efficacy of LLLT in treating Bell's palsy by comparing its outcomes with control treatments in randomized controlled trials (RCTs).

Methods: A comprehensive literature search was conducted across databases such as PubMed, Google Scholar, ScienceDirect, and PEDro, using keywords like "Bell’s Palsy," "Low-Level Laser Therapy," and "randomized controlled trial." Five RCTs were included, comprising a total of 349 participants, with 155 in the LLLT groups and 194 in control groups. Data were extracted using a modified Cochrane template and analyzed using SPSS version 25, focusing on outcome measures such as the House-Brackmann Scale and Sunnybrook Facial Grading System.

Results: LLLT showed significant improvements in facial function compared to control treatments, with effect sizes favoring LLLT (Effect size: 0.65, 95% CI: 0.35-0.95, p<0.001). The review identified moderate heterogeneity (I² = 48%).

Conclusion: LLLT appears to be a promising non-invasive treatment for Bell's palsy, enhancing facial nerve function and recovery. Further high-quality RCTs are needed to standardize treatment protocols and confirm these findings.