A systematic review of treatment for patients with burning mouth syndrome

Huann Lan Tan, Jared G Smith, Jan Hoffmann, Tara Renton, Huann Lan Tan, Jared G Smith, Jan Hoffmann, Tara Renton

Abstract

Background: Burning mouth syndrome is a chronic idiopathic intractable intraoral dysaesthesia that remains a challenge to clinicians due to its poorly understood pathogenesis and inconsistent response to various treatments.

Aim: This review aimed to study the short- (≤3 months) and long-term (>3 months) effectiveness and sustainable benefit of different burning mouth syndrome treatment strategies and the associated side effects.

Materials and methods: Randomised controlled trials of burning mouth syndrome treatment compared with placebo or other interventions with a minimum follow up of 2 months were searched from the PubMed, Embase and Cochrane database (published to July 2020).

Results: Twenty-two studies were selected based on the inclusion and exclusion criteria and analysed. Nine categories of burning mouth syndrome treatment were identified: Anticonvulsant and antidepressant agents, phytomedicine and alpha lipoic acid supplements, low-level laser therapy, saliva substitute, transcranial magnetic stimulation, and cognitive behaviour therapy. Cognitive behaviour therapy, topical capsaicin and clonazepam, and laser therapy demonstrated favourable outcome in both short- and long-term assessment. Phytomedicines reported a short-term benefit in pain score reduction. The pooled effect of alpha lipoic acid (ALA) pain score improvement was low, but its positive effects increased in long term assessment.

Conclusion: A more significant volume in terms of sample size, multi-centres, and multi-arm comparison of therapeutic agents with placebo and longitudinal follow-up studies is recommended to establish a standardised burning mouth syndrome treatment protocol. Further studies are required to assess the analgesic benefits of topical clonazepam and capsaicin, alternative medicines with neurodegenerative prevention capability and psychology support in treating burning mouth syndrome and reducing systemic adverse drug reactions.Registration International Prospective Register of Systematic Reviews (PROSPERO):Protocol ID - CRD42020160892.

Keywords: Burning mouth syndrome; glossodynia; systematic review; treatment.

Conflict of interest statement

Declaration of conflicting interests: The authors declared the following potential conflicts of interest with respect to the research, authorship, and/or publication of this article: HLT, JGS and TR declare no potential conflicts of interest with respect to the research, authorship and/or publication of this article. JH is consulting for and/or serves on the advisory boards of AdCel Biopharma, Allergan, Autonomic Technologies Inc., Cannovex BV, Chordate Medical AB, Eli Lilly, Hormosan Pharma, Lundbeck, Novartis, Sanofi and Teva. He has received honoraria for speaking from Allergan, Autonomic Technologies Inc., Chordate Medical AB, Lundbeck, Novartis and Teva. He received personal fees for Medico-Legal Work as well as from Oxford University Press, Quintessence Publishing, Sage Publishing and Springer Healthcare. He receives research support from Bristol-Myers-Squibb. All these activities are unrelated to the submitted work.

Figures

Figure 1.
Figure 1.
Flow chart on the study selection process (adapted from PRIMA, 2009).
Figure 2.
Figure 2.
Forest plot showing standardised mean differences (SMD) and 95% confidence intervals for short-term outcomes (≥2 months and ≤3 months) of RCTs comparing an intervention with placebo for the treatment of BMS (with separate pooled effects for ALA).
Figure 3.
Figure 3.
Forest plot showing standardised mean differences (SMD) and 95% confidence intervals for long-term outcomes (>3 months) of RCTs comparing an intervention with placebo for the treatment of BMS (with separate pooled effects for ALA).
Figure 4.
Figure 4.
Forest plot showing relative risks (RRs) and 95% confidence intervals for short-term outcomes (improvement on VAS at ≤3 months) of RCTs comparing an intervention with placebo for the treatment of BMS (with pooled effect for ALA).
Figure 5.
Figure 5.
Forest plot showing relative risks (RRs) and 95% confidence intervals for long-term outcomes (improvement on VAS at >3 months) of RCTs comparing an intervention with placebo for the treatment of BMS (with pooled effect for ALA).

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