Sleep Apnoea, Snoring and Dental Appliances: A Townsville Guide

Obstructive sleep apnoea is one of the most under-diagnosed conditions in adult Australians. The Sleep Health Foundation estimates that roughly one in four Australian men and one in ten Australian women have at least mild obstructive sleep apnoea (OSA), and that the majority are undiagnosed. The condition is associated with cardiovascular disease, stroke, type 2 diabetes, motor vehicle accidents, and reduced quality of life. Continuous positive airway pressure (CPAP) remains the gold-standard treatment, but a substantial proportion of patients either cannot tolerate CPAP or prefer an alternative — and for these patients, dental sleep medicine offers a validated second pathway.

This guide, written by the editorial team, explains the role of dental appliances in the treatment of snoring and obstructive sleep apnoea, who is suitable, how the device is fitted, and how dental sleep medicine fits alongside sleep physician care in Townsville.

What Obstructive Sleep Apnoea Is

During sleep, the muscles of the upper airway relax. In most people, the airway remains patent and breathing continues normally. In people with OSA, the airway partially or completely collapses during these periods of muscle relaxation, blocking airflow. Each collapse — called an apnoea (complete) or hypopnoea (partial) — typically lasts 10 to 30 seconds, ends with a brief arousal from sleep as the brain detects falling oxygen levels, and is followed by a gasping breath and resumption of sleep. Patients are usually unaware of these arousals but accumulate hundreds per night in severe disease.

The severity of OSA is graded by the apnoea-hypopnoea index (AHI) — the number of events per hour of sleep. The Australasian Sleep Association classification:

• Normal: AHI under 5 events per hour
• Mild OSA: AHI 5 to 14
• Moderate OSA: AHI 15 to 29
• Severe OSA: AHI 30 or more

Symptoms commonly include loud snoring, witnessed breathing pauses, choking or gasping during sleep, excessive daytime sleepiness, morning headaches, dry mouth on waking, difficulty concentrating, and irritability. Long-term untreated OSA increases the risk of hypertension, atrial fibrillation, stroke, type 2 diabetes, and depression. Motor vehicle accident risk is approximately doubled in untreated severe OSA, which is the basis for the Austroads driver licensing rules requiring fitness-to-drive assessment in some cases.

Diagnosis is made by a sleep study. Polysomnography in a sleep laboratory remains the most thorough investigation, but home-based studies are increasingly common, affordable, and adequate for most diagnostic purposes. Townsville has access to home-based sleep study services through GP referral and to inpatient sleep laboratory services through Townsville University Hospital and several private providers.

The Role of Dental Appliances

Mandibular advancement splints (MAS), sometimes called mandibular advancement devices (MAD) or oral appliances, mechanically increase the size of the upper airway during sleep by holding the lower jaw forward of its resting position. The advancement pulls the tongue base and soft tissues anteriorly, enlarging the retroglossal (behind-the-tongue) airway space and reducing the tendency of the airway to collapse during sleep.

The Australasian Sleep Association recognises MAS as:

• A first-line treatment option for snoring without OSA
• A first-line treatment option for mild OSA
• A treatment option for moderate OSA, particularly where CPAP is poorly tolerated or refused
• A second-line treatment for severe OSA where CPAP cannot be used

MAS does not replace CPAP for severe OSA — CPAP remains more effective for severe disease. But for many patients with mild to moderate disease, MAS achieves clinically adequate control of apnoea events with substantially higher long-term compliance than CPAP. Patient acceptance is the key advantage. Studies consistently show that more patients keep using MAS at 12 and 24 months than keep using CPAP, and total airway treatment is the product of efficacy and compliance — not efficacy alone.

How a Custom MAS Is Fitted

The fitting of a custom MAS involves a structured sequence that includes the patient’s GP, sleep physician, and dentist. The process in a typical Townsville context:

Step 1: Diagnosis by sleep study. The patient sees a GP, who refers for a sleep study. The study is interpreted by a sleep physician, who provides a report including the AHI, oxygen desaturation profile, and recommendations.

Step 2: Sleep physician consultation. The sleep physician discusses treatment options. For mild to moderate OSA, MAS is one of the recommended options. For severe OSA, CPAP is usually trialled first; MAS is offered if CPAP is not tolerated.

Step 3: Dental assessment. A dentist trained in dental sleep medicine assesses dental suitability for MAS. Suitability requires:

• A reasonable number of healthy teeth in both arches (typically at least 8 to 10 stable teeth per arch) to retain the appliance
• Adequate periodontal health — advanced gum disease can be a contraindication
• A jaw joint (TMJ) that tolerates forward positioning without significant pain
• Absence of severe bruxism, which can damage the appliance and the underlying teeth
• The ability to breathe through the nose adequately (severe nasal obstruction reduces MAS efficacy)
• An absence of complicated bite anomalies that would interfere with appliance design

Step 4: Impressions or digital scan. Upper and lower dental impressions or intraoral scans are taken. A protrusive bite registration captures the starting position for the appliance, typically 50 to 70 per cent of the patient’s maximum forward jaw movement.

Step 5: Appliance fabrication. The records are sent to a specialised laboratory. Common appliance designs in Australia include the SomnoMed MAS, the Narval CC, and various dorsal-fin titratable designs. Fabrication takes 2 to 4 weeks.

Step 6: Fitting and titration. The patient returns to have the appliance fitted, comfort adjustments made, and instructions provided. The advancement position is then titrated over the following 6 to 12 weeks — typically by quarter-millimetre increments — until snoring resolves and any subjective sleep symptoms (sleepiness, headaches) improve.

Step 7: Follow-up sleep study. Once the patient reports symptomatic improvement, a follow-up sleep study with the appliance in place measures the residual AHI. If the residual AHI is adequately reduced (target generally under 5 to 10 depending on baseline severity), treatment is confirmed and the patient moves to long-term maintenance. If the residual AHI remains high, further advancement may be attempted, or the patient may need to return to CPAP or consider combination therapy.

Step 8: Long-term maintenance. Annual dental review checks for fit, wear, and dental side effects. Periodic sleep physician review monitors symptom control. A typical MAS lasts 5 to 10 years.

Side Effects and What to Watch For

MAS is generally well tolerated, but specific side effects are recognised and worth knowing about:

Jaw soreness in the morning. Almost universal in the first week of wear and usually resolves as the masticatory muscles adapt. Gentle jaw stretches and avoiding chewy foods at breakfast help.

Tooth tenderness. Mild sensitivity of the teeth gripping the appliance is common initially and resolves within days to weeks.

Excess salivation or dry mouth. Some patients drool slightly in the first nights; others report dryness. Both resolve with adaptation.

Bite changes over the long term. This is the side effect that most concerns dentists and patients. Years of nightly forward jaw positioning can produce a small change in the bite — typically a slight reduction in the overbite and overjet, and occasionally a posterior open bite. The change is usually less than 1 mm but is measurable and tends to be slowly progressive. Annual dental review monitors for this; simple morning jaw exercises (the “AM aligner” included with some appliances) reduce the rate of change.

TMJ symptoms. A small number of patients develop or worsen TMJ joint pain on MAS therapy. Most cases resolve with adjustment of the advancement position; a minority require discontinuation.

Appliance wear or breakage. Bruxism during sleep wears the appliance. Most last 5 to 10 years with normal use; severe bruxers may need replacement sooner. Damage from cleaning errors (boiling water, dishwasher) is also common.

The dental review schedule is designed to catch all of these early. Discontinuation rates from side effects are substantially lower than discontinuation rates from CPAP, which is part of why MAS compliance is the higher of the two long-term.

MAS Versus CPAP: How to Decide

For mild OSA, MAS and CPAP are roughly equivalent in clinical outcomes; the choice is patient preference. For moderate OSA, CPAP is slightly more effective per night but MAS has better compliance, so the population-level outcome is similar. For severe OSA, CPAP is meaningfully more effective and remains first-line — but MAS is a valid backup for patients who refuse or cannot tolerate CPAP, and combination therapy (CPAP plus MAS, used on different nights or together) is sometimes useful.

The other factors weighing into the decision include:

Travel and lifestyle. MAS is small, requires no power, and is easy to take on travel. CPAP needs power, a humidifier reservoir, and a mask — all manageable but bulkier.

Bed partner factors. CPAP mask hiss can disturb partners. MAS is silent.

Throat dryness or claustrophobia. Some patients find masks intolerable. MAS avoids the face entirely.

Dental requirements. MAS requires adequate teeth and dental health; CPAP does not. Edentulous (no teeth) patients are not MAS candidates without implant-supported retention.

Cost over time. CPAP machines have ongoing costs (masks every 6 to 12 months, tubing, humidifier water). MAS is a higher upfront cost with low maintenance.

The sleep physician and the dentist together discuss the options with the patient. The decision is not irrevocable — many patients trial both at different times.

Snoring Without Sleep Apnoea: A Specific Use Case

A substantial number of patients have loud disruptive snoring without obstructive sleep apnoea. The sleep study is normal but the snoring is real and is disrupting the partner’s sleep, sometimes to the point of separate bedrooms. For these patients, MAS is a recognised treatment and often the most effective option short of surgical airway intervention.

Other non-MAS interventions worth considering in parallel:

• Side-sleeping (positional therapy) — many people only snore when sleeping on their back
• Weight loss — even modest weight loss reduces snoring significantly in many patients
• Alcohol reduction, particularly in the three hours before bed
• Treatment of nasal obstruction (allergic rhinitis, deviated septum, polyps)
• Avoidance of sedating medications when possible

A custom MAS for snoring without OSA is often less costly than a treatment-grade device for diagnosed OSA, because titration is less critical and follow-up sleep studies may not be needed. Cost in Australia for this use ranges from approximately $1,500 to $2,400.

Bruxism and Sleep Apnoea: A Recognised Overlap

Sleep bruxism and obstructive sleep apnoea overlap significantly. A substantial proportion of bruxers have undiagnosed OSA, and bruxism is sometimes the only obvious clinical sign of the underlying condition. The mechanism is debated — one theory holds that bruxism is part of the arousal response to apnoea events and serves to re-open the airway through muscle activity.

Patients presenting to a Townsville dentist with bruxism wear patterns, particularly those with daytime sleepiness, snoring, or hypertension, should be screened for OSA. The existing stress and oral health article covers the bruxism end of this overlap, and the shift-worker bruxism article addresses the sleep-disruption end. A patient with both bruxism and OSA may benefit from a single appliance that addresses both — some MAS designs incorporate splint-like surfaces that protect against bruxism while delivering airway advancement.

Finding a Townsville Dentist for Dental Sleep Medicine

Not all dentists fit MAS. Dental sleep medicine requires additional training beyond general dentistry, ongoing collaboration with sleep physicians, and access to specialised laboratory services. Patients interested in MAS for snoring or diagnosed OSA should ask specifically whether the clinic provides dental sleep medicine services and whether the dentist works with a sleep physician network.

For background on sleep-related dental conditions, see the TMJ and jaw clicking guide and the bruxism and night grinding article. For a list of Townsville general dental clinics that may offer dental sleep medicine services, see the Townsville dental clinic directory.

Patients with suspected sleep apnoea should start with their GP for sleep study referral. The dental appliance step comes after diagnosis, not before — and the order matters for both insurance cover and clinical safety.