Sleep apnea and dentistry: the dentist's role

Obstructive sleep apnea (OSA) isn't a tiredness problem. It's a systemic disease with documented consequences: arterial hypertension, cardiovascular risk, cognitive decline, metabolic disturbance, chronic fatigue, and reduced life expectancy. And most patients who have it don't know. We detect it earlier in dental consultation than in many other clinical contexts, because OSA leaves anatomical traces a trained dentist can read.

The mechanism is simple: during sleep, upper airway muscles relax. In people with favorable anatomy, that's not a problem. In people with a narrow palate, retracted jaw, large tongue, hypertrophic tonsils, or excess weight, that relaxation partially or fully closes the airway. The result is a respiratory pause (apnea) or a significant flow reduction (hypopnea). The brain reacts with a microarousal to reopen the airway. The person falls back asleep. The cycle repeats, sometimes dozens of times per hour.

The most frequent signals that lead to evaluation are habitual snoring, waking with choking sensation, daytime sleepiness despite sleeping enough, jaw pain or headache on waking, dry mouth, nocturnal reflux, and bruxism. There's another the patient rarely associates: sleep bruxism. Nocturnal masticatory hyperactivity can be a body response to the microarousals. When we see severe bruxism in consultation, we evaluate the airway systematically.

Definitive diagnosis comes from a sleep study. Polysomnography is the gold standard and measures the apnea-hypopnea index (AHI), oxygen saturation, and sleep architecture. Respiratory polygraphy is a simpler alternative for cases without suspicion of neurological pathology. These studies are run by a sleep medicine team. My role as a dentist is to identify the clinical signs, refer when appropriate, and participate in treatment with oral appliances when indicated.

The gold-standard treatment for severe OSA remains CPAP, a machine that delivers continuous positive pressure during the night. It works well and the clinical evidence is solid. The problem is adherence. Many patients abandon it within the first months due to discomfort, noise, nasal dryness, claustrophobia, or plain resistance to long-term use. That's where the mandibular advancement device (MAD) often becomes the real alternative, not the backup plan.

The MAD is a custom-designed intraoral device worn at night. It advances the mandible a few millimeters, and that movement opens the upper airway. We design it with digital intraoral scanning, no uncomfortable molds, comfortable thermoplastic material, and a titratable advancement mechanism. Clinical evidence supports its use in mild to moderate OSA as first-line therapy, in severe OSA when the patient cannot tolerate CPAP, and as combined therapy in selected cases. MAD adherence rates are significantly higher than CPAP, and clinical efficacy is well documented in the literature.

The other scenario where the dentist is central is pediatric apnea. A child who chronically snores, breathes through the mouth, or has large tonsils may be developing an altered facial pattern: narrow palate, crossbite, retrognathia, low tongue posture. The window to intervene is between ages 4 and 9. What can be corrected in that period with maxillary expansion, functional orthopedics, and timely ENT referral when adenoid-tonsillar hypertrophy is present is much harder to reverse in adolescence. Pediatric apnea isn't the same disease as adult apnea, but they share the same logic: anatomy rules.

Patients who arrive with bruxism, snoring, or daytime sleepiness often don't connect those symptoms to an airway problem. Treating bruxism alone with a night guard, without investigating whether sleep-disordered breathing is behind it, is working the symptom and leaving the cause untouched. Airway evaluation is part of the academic standard we apply as NYU College of Dentistry faculty, and it should be standard in any serious dental practice.