Bruxism & TMJ

Bruxism and Jaw Pain (TMJ)

Bruxism is the involuntary grinding or clenching of the teeth, most commonly occurring during sleep but also during waking hours in periods of stress or concentration. Over time, bruxism can lead to significant strain on the temporomandibular joint (TMJ), the muscles of mastication and the teeth themselves. It is a common condition that frequently goes undiagnosed until symptoms become pronounced. Osteopathic treatment offers a manual approach to manage the muscular and mechanical consequences of bruxism.

Symptoms of Bruxism

The signs and symptoms of bruxism can be varied and may develop gradually:

• Morning jaw stiffness or pain — Upon waking, patients often report a dull ache in the jaw muscles, difficulty opening the mouth fully or a feeling of jaw fatigue.
• Headaches — Temporal headaches, often mistaken for tension headaches, are frequently caused by overactivity of the temporalis and masseter muscles during nocturnal clenching.
• Tooth sensitivity or wear — Excessive clenching or grinding can wear down tooth enamel, cause fractures or increase dental sensitivity. Dentists are often the first to identify signs of bruxism.
• TMJ clicking or locking — The constant mechanical stress of bruxism can lead to disc displacement within the TMJ, producing clicking sounds or episodes of jaw locking.
• Ear pain and tinnitus — The proximity of the TMJ to the ear canal means that jaw dysfunction can produce referred ear pain, a sensation of ear fullness or ringing sounds.
• Neck and shoulder tension — Bruxism frequently coexists with cervical muscular tension, as the jaw and neck share neuromuscular connections.

TMJ Anatomy

The temporomandibular joint is a complex, bilateral joint formed between the mandible (lower jaw) and the temporal bone of the skull. It is one of the most frequently used joints in the body, involved in chewing, speaking, yawning and swallowing. The joint contains an articular disc that acts as a cushion between the bony surfaces, and is surrounded by a capsule reinforced by ligaments.

The primary muscles of mastication — the masseter, temporalis, medial and lateral pterygoids — work in coordination to control jaw movement. When bruxism leads to chronic overactivation of these muscles, the result is muscular fatigue, hypertrophy, trigger points and altered joint mechanics.

Why Does the Jaw Clench?

Bruxism is considered to be multifactorial, with the following elements frequently contributing:

• Stress and anxiety — The most commonly cited factor. Emotional stress triggers increased muscular tension throughout the body, with the jaw being a particularly common site of tension accumulation.
• Sleep disorders — Bruxism is associated with micro-arousals during sleep and is more prevalent in patients with sleep apnoea or other sleep disturbances.
• Dental factors — Malocclusion, recent dental work or ill-fitting dental restorations can alter bite mechanics and contribute to clenching.
• Postural factors — Forward-head posture, cervical tension and thoracic stiffness can influence mandibular position and predispose to jaw clenching.
• Neurological factors — Certain medications, stimulant use and neurological conditions can increase the likelihood of bruxism.

Five-Step Osteopathic Treatment Approach

The osteopathic management of bruxism follows a structured approach:

1. Clinical assessment — Detailed history of symptoms, dental history, sleep quality, stress levels and associated complaints. Physical examination of the TMJ, cervical spine, posture and cranial structures.
2. Myofascial release of masticatory muscles — Both extra-oral and intra-oral techniques are used to release tension in the masseter, temporalis and pterygoid muscles. This is often the most immediately effective component of treatment.
3. TMJ and cervical mobilisation — Gentle mobilisation of the temporomandibular joint and cervical spine to restore balanced mechanics and reduce strain on the TMJ.
4. Cranial techniques — Assessment and treatment of the temporal bones, sphenoid and other cranial structures that influence TMJ function. Cranial techniques can help to regulate autonomic tone and reduce overall tension.
5. Self-care advice and coordination — Guidance on jaw relaxation exercises, stress management techniques, sleep hygiene and postural correction. Recommendation for dental review if an occlusal splint may be beneficial.

Number of Sessions

For acute bruxism-related jaw pain, 2 to 3 sessions are typically sufficient to achieve significant symptom relief. For chronic or long-standing bruxism with established TMJ dysfunction, 4 to 6 sessions may be needed, with periodic follow-up appointments to maintain the results. The frequency and duration of treatment depend on the severity of symptoms and the patient's response to care.

Coordination with Dental Care

Osteopathic treatment of bruxism is most effective when combined with appropriate dental management. The osteopath may recommend that the patient consult their dentist for assessment of occlusion, possible fabrication of an occlusal splint (night guard) and monitoring of tooth wear. A collaborative approach between osteopath and dentist ensures comprehensive management of the condition.

References

• Cuccia AM, Caradonna C, Annunziata V, Caradonna D. (2010). Osteopathic manual therapy versus conventional conservative therapy in the treatment of temporomandibular disorders: a randomized controlled trial. Journal of Bodywork and Movement Therapies, 14(2):179-184. PMID 20226365
• La Touche R, Martínez García S, Serrano García B et al. (2020). Effect of manual therapy and therapeutic exercise on pain and pressure pain sensitivity in patients with temporomandibular disorders: a systematic review and meta-analysis. Pain Medicine, 21(10):2373-2384. PMID 33114236