Role of Orthodontist in Obstructive Sleep Apnea - An Orthodontic Review

Luv Agarwal and Ankit Gupta

Published Date: 2016-08-25
Luv Agarwal* and Ankit Gupta

Department of Orthodontics and Dentofacial Orthopedics, Saraswati Dental College and Hospital, Haridwar, Uttrakhand 249401, India

*Corresponding Author:
Luv Agarwal
Department of Orthodontics and Dentofacial Orthopedics
Saraswati Dental College and Hospital, Haridwar
Uttrakhand 249401, India
Tel: 9758571324
Fax: 9758571324

Received date: June 27, 2016; Accepted date: August 18, 2016 ; Published date: August 25, 2016

Citation: Agarwal L, Gupta A. Role of Orthodontist in Obstructive Sleep Apnea An Orthodontic Review. J Orthod Endod. 2016, 2:3. doi: 10.4172/2469-2980.100027

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Obstructive sleep apnea (OSA) is a common sleep associated breathing disorder with profound effects on the health and quality of life of individuals suffering from it. Orthodontists should be well aware of the symptoms of this disorder and competent enough to recognize its signs and symptoms. Orthodontics is well suited for treatment of OSA patients due to their expertise and knowledge regarding growth and development of oro-facial and dento-facial structures as well as orthopedic, orthodontic and surgical correction of the jaws and other supporting tissues. The aim of this article is to provide an outlook to the essential role of orthodontists in the treatment of this serious disease.


Obstructive sleep apnea; Orthodontics; Sleep; Snoring


Obstructive sleep apnea (OSA) is a sleep-associated disorder of breathing with a reduction or complete airflow obstruction despite an ongoing effort by patient for breathing. It usually occurs during sleep, muscles undergoes relaxation and causes collapse of the soft tissues present in the back of the throat which leads to upper airway blockage (Figure 1). Consequently, there are partial and complete pauses in breathing that last at least 10 seconds during sleep. Then, blood oxygen saturation, with oxygen levels decreases abruptly and falls 50% or more in severe cases. The brain shows response when there is less oxygen and alerts the body which causes a brief arousal from sleep. This restores normal pattern of breathing. This pattern can occur hundred times in one night. This results a fragmentation in sleep quality and produces an excessive sleepiness during daytime [1,2]. Chronic persistent sleeping is a common symptom which prevails throughout the life and caused by interplay between a variety of factors including sleep-related loss of muscle tone in the tissues, large tonsils, large tongue, and anatomical obstruction of air passages, a retro gnathic mandible, alcohol, obesity, sedatives and allergic medications. Since sound of snoring is a key symptom of obstructive sleep apnea, it has become a medical concern [3].


Figure 1: Obstructive sleep apnea: An overview.

In sleep study monitoring, the frequency of apneas and hypopneas per hour of sleep (apnea-hypopnea index [AHI]) is the key measure to define and stratify the severity of OSA, although inherent limitations to this metric include not taking into consideration degree of accompanying hypoxia, length of respiratory events, etc. AHI levels of 5, 15 and 30 have been used as cut-points to define mild moderate and severe OSA, respectively. Apnea can be distinguished as obstructive vs. central based upon presence or absence of thoracoabdominal effort [4,5].

Many studies have revealed an association between OSA severity and other common causes of increased mortality such as hypertension, stroke, coronary artery disease, and occupational, as well as automobile accidents. For this reason, OSA has been increasingly recognized as a major public health issue imposing great economic burden, thereby mandating early recognition and treatment [6-10].


OSA can occur in any age group, but prevalence increases between middle and older age. OSA with resulting daytime sleepiness occurs in at least 4% of men and 2% of women. About 24% of men and 9% of women have the breathing symptoms of OSA with or without daytime sleepiness. About 80% to 90% of adults with OSA remain undiagnosed. OSA occurs in about 2% of children and is most common at preschool ages [11-14].

Pathophysiology of Obstructive Sleep Apnea

It has been considered that individuals with OSA have impairment in function of genioglossus muscle, which is a muscle of tongue. This causes the prolapse of the tongue against the posterior pharyngeal wall when there is inspiratory effort during sleep. Pharyngeal wall invaginates and airway occludes during sleep [15-18]. Obstruction in nasal air flow increases air flow resistance, which in turn increases effort for inspiration and increases negative pressure in the pharyngeal wall airway (Figure 2). This suction increases the chances of pharyngeal airway collapse [19-21].


Figure 2: Negative pressure increase in the pharyngeal wall airway.

Predisposing Factors

They are summarized in Table 1 [22-25].

S.No. Predisposing factors of OSAHS
1 Obesity
2 Presence of structural abnormalities that causes upper airway obstruction
3 Increasing age
4 Male gender
5 Smoking and alcohol consumption
6 Sedatives
7 Retrognathic mandible
8 Adenoids
9 Micrognathia
10 Enlarged tonsils
11 Enlarged tongue

Table 1: Predisposing factors of OSAHS.

Symptoms of Obstructive Sleep Apnea

They are summarized in Table 2 [26-29].

S.No. Symptoms of OSAHS
1 Snoring
2 Apneic pauses ie..choking, gasping, snoring during the night
3 Restless sleep and increased body movements
4 Bruxism (nocturnal tooth grinding)
5 Nocturnal and daytime enuresis
6 Neck hyper extension
7 Growth failure restriction
8 Mouth breathing, due to dryness in mouth
9 Chronic nasal congestion
10 Walking during sleep
11 Obesity
12 Mouth breathing, due to dryness in mouth
13 Fatigue
14 Mood changes; irritabitility, frustration, impatience, depression, anxiety
15 Aggression and hyperactivity
16 Poor school performance
17 Poor concentration, and distraction
18 Infraorbital venous congestion

Table 2: Symptoms of OSAHS

Features of Obstructive Sleep Apnea

They are summarized in Table 3 [30].

S.No. Features of OSAHS
1 Excessive daytime sleepiness
2 Impairment in concentration
3 Snoring
4 Disturbed sleep
5 Choking episodes during sleep
6 Apneas
7 Personality changes
8 Nocturia
9 Decreased libido

Table 3: Features of OSAHS

Effects of Obstructive Sleep Apnea

They are summarized in Table 4 [31].

S.No. Effects of OSAHS
1 Fluctuations in oxygen levels
2 Increased heart rate
3 Chronic elevation in daytime blood pressure
4 Increased chances of stroke
5 Heart disease
6 Impairment in glucose tolerance and insulin resistance
7 Impaired concentration
8 Mood changes
9 Increased motor vehicle accidents
10 Disturbed sleep of the bed partner

Table 4: Effects of OSAHS.

Diagnosis of Obstructive Sleep Apnea

The frequency of pauses in breathing on an hourly basis is used for assessment of the severity of the obstructive sleep apnea hypopnea syndrome (OSAHS) and it is called the apnea/hypopnea index (AHI) or the respiratory disturbance index (RDI). It is the one most commonly used [32].

OSAHS may be subdivided into three categories degrees of breathing abnormality, on the basis of AHI (Table 5) [33].

S.No. Forms of OSAHS AHI Score
1 Mild AHI 5-14/hr
2 Moderate AHI 15-30/hr
3 Severe AHI >30/hr
4 Very severe AHI >40/hr

Table 5: Forms of OSAHS.

Subjective assessment of sleepiness

Individuals with this disorder may present with non-specific symptoms such as poor concentration, irritability, personality changes and family problems. The patient should be asked the following questions:

• Are you falling asleep regularly against your will?

• Are you often feeling sleepy while driving?

• Are you having difficulty while working?

• Is surgery for snoring being performed?

The Epworth Sleepiness Scale (ESS) is a validated method used to assess the probability of falling asleep. The score subdivide the patients clinically into 4 categories (Table 6) [34].

S.No. Types of Sleepiness ESS Score
1 Normal range ESS <11
2 mild subjective daytime sleepiness ESS =11
3 moderate subjective daytime sleepiness ESS =16
4 Severe subjective daytime sleepiness ESS >18

Table 6: Epworth Sleepiness Scale (ESS).

Objective assessment of sleepiness

The Multiple Sleep Latency Test (MSLT) is used to measure the time to fall asleep (using EEG criteria). This is performed in a dark room on at least four separate occasions across the day. This period of time is called as sleep latency.

Physical examination

• Weight and height are noted at the first clinic visit. Changes in height and weight are observed at all subsequent visits as approx 50% of patients with OSAHS are obese (BMI >30 kg/m2).

• Circumference of neck are measured as patients with OSAHS often have increased neck circumference >17 (43 cm).

• Visually inspect for retrognathic mandible.

• Assess patency of nasal airway.

• Upper airway obstruction is assessed using indirect laryngoscopy if possible.

• Inspect the tongue for macroglossia.

• Assess dentition for the presence or absence of teeth.

• Assess pharynx for size of tonsil, appearance of uvula and size of lumen.

• Measure blood pressure.

• Perform respiratory, cardiovascular and neurological examination for detection of any disease such as cor pulmonale, deformity in chest wall and myopathies.

• Observe the possibility of hypothyroidism, acromegaly and thyroid function tests should be indicated [35-38].

Tools Used in Diagnosis of Obstructive Sleep Apnea

Polysomnography (PSG)

Polysomnography records patterns of sleeping and breathing together. PSG is performed overnight at a sleep centre with the help of a technician and a standard PSG typically consists of EEG, electromyogram, electro-oculogram, respiratory airflow, thoraco-abdominal movement and oxygen saturation tracings (oximetry).

Polysomnography requires about 30-60 min set up time before sleep and about 30 minutes detachment time in the morning. Staff should be present for at least ten hours overnight to perform and monitor this test [39-41].


Cheap recording pulse oximeters are readily available; therefore oximetry is used as the first screening tool for OSAHS. These are spectrophometric devices that are used for the detection and calculation of the differential absorption of light by presence of oxygenated and deoxygenated haemoglobin in blood. This is a method for detection of the blood oxygen saturation [42].

Treatment of Obstructive Sleep APNEA

Treatment options can be broadly divided into [43]:

1. Behavioral interventions

2. Non-surgical options

3. Surgical options

Behavioral interventions

Since patients with obstructive sleep apnea are obese, therefore patients should be advised to undergo weight reduction therapy as it improves symptoms of OSAHS and other related disorders. Smokers should be advised to stop smoking for general health.

Alcohol should not be used and drugs and sleeping tablets should be avoided as this may decrease airway dilator function and worsen OSAHS. Positional therapy is for patients who suffer from mild OSA. Patients should be advised from sleeping on their backs and head of the bed is raised to reduce symptoms [44].

Non-surgical interventions

Continuous positive airway pressure (CPAP): CPAP is the treatment option for moderate to severe cases of OSA. A continuous positive airway pressure machine is a new device with a mask that fits snugly over the nose of patient. It transmits a continuous flow of air and keeps the throat open throughout the night (Figure 3).


Figure 3: Continuous positive airway pressure.

Continuous positive airway pressure (CPAP) functions like a pneumatic splint and keeps the airway patent during sleep breathing. It works by means of a flow generator that delivers positive pressure through air tube to a nasal mask worn by the patient. This generation of airflow keeps the airway open and prevents pauses in breathing and restores normal oxygen levels. Newer CPAP devices are quite small, light and available with different mask sizes to achieve a good fit [45,46]. Major side effects of CPAP are significant epistaxis, paranasal sinusitis but they are rare [47,48].

Oral appliance therapy: Orthodontic appliances should be fabricated in a way that it can be worn by the patient either in a permanent or removable manner depending upon the condition of the patient. These appliances bring the mandible and tongue forward, opens up the lower pharynx and allows continuous breathing during sleep [49,50]. Examples are tongue retaining devices (TRD) and mandibular advancement appliances (MAA) (Figures 4 and 5).


Figure 4: Tongue retaining devices.


Figure 5: Mandibular advancement appliances.

• Indications: 1) Patients with snoring or mild OSA who do not respond for treatment with behavioral measures. 2) Patients with moderate to severe OSA who refuse treatment with nasal CPAP. 3) Patients who are not appropriate for tonsillectomy, adenoidectomy, and tracheostomy.

Mechanism of action: Oral appliances are used only during sleep which repositions the lower jaw, tongue, soft palate or uvula and maintains an open and unobstructed airway. It protrudes the mandible and tongue forwards and prevents upper airway collapse during sleep (Figures 6 and 7).


Figure 6: Mechanism of action–oral appliance therapy.


Figure 7: Mechanism of action–oral appliance therapy.


Figure 8: Consequences of untreated OSAHS..

Advantage of Oral appliances

• Significant reduction in breathing pauses

• Improvement of airflow for some patient with apnea

• Reduction in the snoring and

• High compliance level as compared to CPAP

• Disadvantages of oral appliances: Reciprocal forces are generated on the teeth and jaw by mandibular advancement splints which results in dry mouth, gum soreness, salivation, tooth pain, headaches, and TMJ problems [51,52].

Surgical interventions

Surgery is considered when noninvasive therapy such as CPAP and oral appliances has been not successful. It is done in a situation when there is any deformity in anatomic structure that can be later on corrected to eliminate the breathing problems. It addresses the problem by reduction of tissue from the soft palate, uvula, tonsils, adenoids or tongue [53].

Many different surgical approaches have been used in the treatment of OSAHS.

Uvulopalatopharyngoplasty (UPPP): It is the reconstruction of the throat by resection of posterior margins of the soft palate and unwanted mucosa present on the pharyngeal walls [54].

Adenotonsillectomy: It is the surgical removal of the tonsils and adenoids and it is the most common treatment option for children with OSA.

Tracheostomy: Tracheostomy was the first surgical treatment for OSAHS and bypasses the obstruction completely [55,56].

Other surgical techniques

a) Bariatric (weight reducing) surgery: Weight influences the severity of OSAHS and weight loss is an effective treatment for OSAHS in some patients [57].

b) Nasal surgery: Nasal surgery reduces nasal airflow resistance and reduces pressure and improves compliance with nasal CPAP [58].

Consequences of untreated OSAHS

Obstructive sleep apnea negatively impacts quality of life and is also associated with a number of adverse safety and health consequences including cardiovascular disease and motor vehicle crashes. Short habitual sleep duration can result in excessive daytime sleepiness and reduced neurocognitive function. Sleep loss may have long-term health consequences and may lead to premature death, cardiovascular disease, and the development of diabetes. Patients may also experience impaired concentration due to tiredness, increased irritability, depression and mood changes. There is an increased risk of high blood pressure and may have a slightly increased risk of angina, heart attacks and strokes (Figures 8 and 9) [59-62].


The effects of untreated sleep apnea on daily activities are multiple and it includes excessive daytime sleepiness, impaired cognitive function, mood elevations and personality changes. It is also related with a reduction in quality of life and there can be adverse changes on others such as impaired relationships between spouses and partners. Symptoms of sleepiness sleep apnea are observed and these disorders need to be treated urgently. Orthodontists should play an active role in screening of patients for this disease and advise oral appliance therapy, if needed.


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