Sleep Disorders and Orofacial Pain
What you must know
Understand sleep bruxism, obstructive sleep apnea (OSA), and their relationship to orofacial pain and TMD. Sleep bruxism is a rhythmic masticatory muscle activity during sleep, often associated with arousals; it is not simply daytime clenching. OSA involves repeated upper airway collapse with oxygen desaturation and arousals. Know the STOP-BANG screening domains and the role of the dentist in identifying at-risk patients.
Clinical reasoning
Patients with OSA may present with morning headache, dry mouth, fatigue, and partner-reported snoring or apneas. Mandibular advancement devices are a treatment option for mild-moderate OSA and for snoring, but must be titrated and monitored. Bruxism is often multifactorial and not always harmful; treatment targets symptoms and consequences, not the activity itself.
Traps
Do not equate tooth wear with sleep bruxism alone - gastroesophageal reflux and dietary abrasion also contribute. Morning headache is not diagnostic of TMD; it may reflect sleep-disordered breathing or sleep fragmentation. Occlusal splints do not treat OSA and may worsen airway patency if poorly designed. A patient with severe OSA should be referred for medical evaluation, not managed with an appliance alone.
Worked example
A 50-year-old reports morning headaches, jaw soreness, snoring, and daytime sleepiness. STOP-BANG is elevated. The correct next step is referral for sleep evaluation before assuming TMD; a mandibular advancement device may later be considered in coordination with the sleep physician.
Rule of thumb
Snoring + witnessed apneas + daytime sleepiness = screen for OSA. Jaw muscle activity alone does not equal a disorder requiring treatment.