Acupuncture for Temporomandibular Disorders: A Systematic Review
Cho et al. · Journal of Orofacial Pain · 2010
Evidence Level
MODERATEOBJECTIVE
To assess the effectiveness of acupuncture in the treatment of temporomandibular disorders (TMD)
WHO
808 patients with TMD across 14 randomized controlled trials
DURATION
Studies ranged from single sessions up to 30 sessions over several months
POINTS
ST-6, ST-7, LI-4, and SI-19 were the most frequently used points; techniques ranged from classical acupuncture to electroacupuncture
🔬 Study Design
Acupuncture
n=400
Classical acupuncture, electroacupuncture, or related techniques
Controls
n=408
Placebo, physical therapy, medications, or occlusal splint
📊 Results in numbers
Efficacy vs. placebo
Equivalence vs. occlusal splint
Superiority vs. physical therapy
Adverse events
📊 Outcome Comparison
Level of evidence (0-4)
This review of 14 scientific studies shows that acupuncture may be an effective treatment for problems of the temporomandibular joint (TMD), such as jaw pain and difficulty opening the mouth. Acupuncture produced results comparable to traditional occlusal splints and superior to conventional physical therapy.
Article summary
Plain-language narrative summary
This systematic review, conducted by researchers at Kyung Hee University in South Korea, analyzed the effectiveness of acupuncture in the treatment of temporomandibular disorders (TMD) through the analysis of 14 randomized controlled trials involving 808 patients. TMDs represent a group of conditions affecting the temporomandibular joint, masticatory muscles, and associated structures, manifesting as facial pain, limited jaw movement, joint sounds, and muscle tenderness. The prevalence is significant, with approximately 75% of the population showing at least one sign of joint dysfunction and 33% reporting symptoms such as facial pain.
The methodology followed rigorous search criteria across multiple databases through July 2008, including the Cochrane Library, MEDLINE, EMBASE, and specific Asian databases. Included studies compared different modalities of acupuncture (classical, electroacupuncture, auricular, and warm-needle acupuncture) against varied controls including placebo, physical therapy, medications, and occlusal splints. Methodological quality was assessed following Cochrane Handbook criteria, considering randomization, allocation concealment, blinding, incomplete data, and reporting bias.
Results showed moderate evidence that acupuncture produces beneficial effects superior to placebo in three studies involving 65 participants, demonstrating significant improvements in pain intensity (visual analog scale), number of tender areas, headache, functional impairment, tenderness, and maximum mouth opening. When compared to conventional occlusal splints in three studies with 160 participants, acupuncture showed similar efficacy, with significant reductions from baseline in both groups for pain, clinical dysfunction scores, tenderness, and subjective symptoms, with no significant differences between treatments.
Comparisons with physical therapy across four studies (397 participants) revealed superiority of acupuncture, with significant differences in response rates and symptom improvement. Studies comparing acupuncture to medications (indomethacin plus vitamin B1) in 85 participants also favored acupuncture. Three studies with 138 participants demonstrated superiority of acupuncture over waiting-list controls.
The most frequently used points were ST-6, ST-7, LI-4, and SI-19, with protocols ranging from standardized (72%) to individualized (7%) and semi-standardized (21%). The number of sessions ranged from 1 to 30, reflecting heterogeneity in treatment protocols. Adverse events were minimally reported, with only two studies addressing safety, reporting no serious events.
Limitations include significant clinical and methodological heterogeneity across studies, variable diagnostic criteria for TMD, different acupuncture modalities, and diverse outcome measures. Many studies presented methodological shortcomings such as inadequate reporting of randomization, lack of blinding, and limited follow-up results. Sample sizes were small in several studies, with six having fewer than 20 participants per group.
Clinical implications suggest that acupuncture represents a viable therapeutic option for TMD, offering benefits equivalent to conventionally recommended treatments such as occlusal splints and physical therapy. The evidence supports specific effects of acupuncture beyond placebo, although overall study quality remains limited. Future research requires adequate sample sizes, better methodological control, standardized protocols, and assessment of long-term efficacy.
Strengths
- 1Comprehensive systematic search across multiple databases including Asian literature
- 2Rigorous methodological quality assessment using Cochrane criteria
- 3Analysis of multiple comparisons (placebo, conventional treatments)
- 4Consistent evidence of benefit across different controls
Limitations
- 1Significant heterogeneity across studies in protocols and outcome measures
- 2Limited methodological quality in most included studies
- 3Small sample sizes in several studies
- 4Limited data on safety and long-term effects
- 5Variable diagnostic criteria for TMD across studies
Expert Commentary
Dr. Marcus Yu Bin Pai
MD, PhD · Pain Medicine · Physical Medicine and Rehabilitation · Medical Acupuncture
▸ Clinical Relevance
TMD is a widely underdiagnosed condition in musculoskeletal pain services, and this systematic review provides concrete data that support acupuncture as a first-line therapeutic strategy. The finding of equivalence with the occlusal splint — the dental gold standard — is clinically significant: it gives the physiatrist an effective tool for patients who cannot tolerate the splint, do not adhere to nightly use, or who have already tried that approach without satisfactory results. Superiority over conventional physical therapy is also relevant for integrated therapeutic planning. Patients with predominantly muscular TMD, frequently comorbid with cervical pain and tension-type headache — a profile very common in rehabilitation clinics — are natural candidates for this approach. The favorable safety profile, with minimal adverse events across 808 patients, reinforces the feasibility of incorporating acupuncture early in the protocol, before escalating to more invasive interventions.
▸ Notable Findings
Three findings stand out in this review. First, the equivalence between acupuncture and the occlusal splint across multidimensional outcomes — pain, clinical dysfunction, tenderness, and subjective symptoms — suggests that the mechanisms of action, although distinct, converge toward similar central and peripheral nociceptive modulation. Second, the superiority over conventional physical therapy across four studies and nearly 400 participants is the most numerically robust result of this review, indicating that acupuncture is not merely a complement, but may be the principal active component in certain protocols. Third, the point selection — ST-6, ST-7, LI-4, and SI-19 — is consistent with the neuroanatomy of the trigeminal nerve and with descending pain inhibition mechanisms recognized in the neurophysiology literature, conferring consistent biological plausibility to the observed effects beyond placebo.
▸ From My Experience
In my practice with myofascial-component TMD — which represents the majority of cases that reach the pain clinic — I tend to observe perceptible clinical response between the third and fifth session, especially in patients with increased tenderness at ST-6 and LI-4 on initial physical examination. The protocol I have used most consistently combines systemic acupuncture at the classical jaw points with dry needling of trigger points in the masseter and temporalis, alongside masticatory hygiene guidance and, when necessary, low-dose cyclobenzaprine during the first two weeks. On average, I run 8 to 12 sessions until stabilization, with monthly maintenance reassessment in recurrent cases. I prioritize acupuncture in patients with severe nocturnal bruxism who cannot tolerate the splint, and in TMD cases with comorbid headache, where the functional gain is usually broader than what treatment of the joint alone would suggest.
Indexed scientific article
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Scientific Review
Marcus Yu Bin Pai, MD, PhD
CRM-SP: 158074 | RQE: 65523 · 65524 · 655241
PhD in Health Sciences, University of São Paulo. Board-certified in Pain Medicine, Physical Medicine and Rehabilitation, and Medical Acupuncture. Scientific review and curation of every entry in this library.
Learn more about the author →Medical disclaimer: This content is for educational purposes only and does not replace consultation, diagnosis, or treatment by a qualified professional. Some information may be assisted by artificial intelligence and is subject to inaccuracies. Always consult a physician.
Content reviewed by the medical team at CEIMEC — Integrated Centre for Chinese Medicine Studies, a reference in Medical Acupuncture for over 30 years.
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