Proper sleep quality is critical for optimal health and prevention of disease. When patients do not get enough healthy sleep, they are at increased risk of getting sick. In this three-part series, I will review how dentists can better understand, uncover and diagnose potential sleep-related disorders. I will also review principles of treatment and management with the ultimate goal of patients having an improved quality of life and more successful outcomes with their dental care. This article will discuss the key elements that can provide insight on potential airway issues.

Untreated airway and sleep-related issues have been proven to increase the likelihood that these diseases could progress without intervention. Dentists can often diagnose or suspect various medical aliments patients may have through comprehensive oral examinations. There are clearly established findings that suggest the oral cavity can provide insight into a patient's potential medical disease, such as temporomandibular disorder, diabetes, gastroesophageal reflux disease and cardiovascular health, to name a few. Current research is now demonstrating that poor sleep is a contributing factor affecting patients’ health. Patients’ sleep histories - such as nocturnal bruxism, snoring, insomnia and frequent nocturia - need to be investigated and understood, since they can be clear signs of sleep-related disorders.

Dental providers typically see patients a minimum of two times a year for routine maintenance, which is sometimes more often than patients see their own physician. This creates an opportunity to help patients become educated about the effects of poor sleep through diagnosis and examination so they can understand and receive medical care for this health-related epidemic. 

Sleep-related disorders are mentioned more regularly in the media, so patients are more likely to ask if they have a problem and if they are at risk. Dental care providers can often be the first to uncover sleep-related issues by inquiring about and observing signs and symptoms that patients may not be aware of. Providers must become more knowledgeable about the appropriate questions to ask and what to look for as an important first step to diagnosing and improving a patient's health. 

Routine review of a patient's medical, dental and sleep history - combined with a thorough clinical exam - can uncover and bring to light multiple risk factors resulting from poor quality of sleep. The key is knowing the signs and symptoms that can alert practitioners to a potential issue. 

airway sleep disorders diagnosis

To ensure clinical success of a restorative dental treatment, dentists have been taught to fully understand the etiology of a patient's oral breakdown. “Facially Generated Treatment Planning” (FGTP) has transitioned into “Airway Facially Generated Treatment Planning” (AFGTP) and providers must now understand the impact airway has on patients’ medical and dental health. 

The most important part of understanding a patient's airway is the exam, which can begin as you watch your patients walk down the hall. Observing head position, gait and eyes can be initial signs that a patient is suffering from poor quality of sleep.

Diagnosing airway issues through comprehensive exams

My comprehensive and routine exams begin with a careful review of a patient's medical history. Poor sleep is associated with multiple co-morbidities. Therefore, when patients report conditions such as high blood pressure, atrial fibrillation, diabetes, gastroesophageal reflux disease, headaches, depression and TMD, providers should start to consider the airway as a contributory factor. Reviewing medications, such as blood pressure medication, beta-blockers, sleep aids, anti-depressants and H2 blockers, provide a window into a patient's medical health.

Clinically, the physical exam may be the best indicator of potential airway issues. Personally, I start from the outside and work my way into the mouth, exactly the same way we are taught in the FGTP workshop. However, now I am looking for additional signs of an airway disorder. 

Patients do not only have airway issues while they sleep; it is a problem they must overcome while awake. The human body is proficient at compensating and working around many physical and anatomic limitations, and these mechanisms leave clues to an underlying problem. 

How the body compensates for airway issues

When we sleep and our bodies become atonic in stage N3/N4 sleep, we lose the ability to compensate for hard and soft tissue factors, which results in sleep-related disorders. A forward head posture - where the head will be positioned in front of the shoulders - is the body’s compensating mechanism for stretching the soft tissue, making it easier to breathe.

Mouth breathing is another example of compensation. Many patients who mouth breathe will also have a strong gag reflex, since the body is trying to protect the airway. If a patient has a deviated septum, enlarged tonsils, allergies or nasal stenosis, he or she will learn to breathe through their mouth. This is a mechanism that must be corrected, as nasal breathing is a more efficient and advantageous way to breathe. 1

Asymmetric nostrils provide an easy way to screen for a deviated septum. Examining the internal aspect of the nose for red and inflamed tissue should also be considered. The concern is that mouth breathing is a less effective way of breathing, since the nose warms and filters air. 

Mouth breathing can also lead to craniofacial developmental deficiencies that can negatively affect growth, development and, ultimately, the airway. Dentally, mouth breathing contributes to dry mouth, which often increases the risk of a breakdown of the dentition. 

As previously mentioned, when we sleep, our bodies become atonic in stage 3/4 sleep or deep sleep. Mouth breathing can make the tongue fall back and block the airway. An individual who mouth breathes and is unable to compensate by breathing through their nose will thus suffer from sleep-disordered breathing.

Impact of pre-existing conditions on airway

Venous pooling, or those dark discolorations around our eyes, is another sign of disturbed sleep and can be an indicator of a more serious issue. Patients with myofascial pain and TMD should be screened as airway patients, since headaches and migraines - as well as chronic muscular and joint pain - can help uncover airway patients. 

The muscles often have to hold the jaw in a more forward position so patients can breathe, which can result in the muscles building up with lactic acid and becoming sore. As a result, it is critical we examine and palpate these muscles. Correcting airway and sleep disorders often lends to the alleviation of these muscular and joint issues. Primary and secondary damage to the joint and joint position should be evaluated, since many patients have craniofacial deficiencies and can severely impact this area. 1 As I have advanced in both my restorative and airway treatments, I have found a great need for a cone beam computed tomography (CBCT) to better elucidate anatomical issues that may be associated with sleep disordered breathing. This understanding of anatomy can then influence treatment approaches.

Intraorally, the signs of an airway issue can be even more evident. Tongue position and shape provide information about a patient's airway, childhood growth and development and sleep. Tongue scalloping occurs when the tongue does not have enough room and the teeth indent the tongue along the sides.

Typically, in constricted arches, the tongue will be forced to sit high in the mouth. This can result in the tongue blocking the airway during sleep. During the day, the body constantly tries to move the jaw forward to create more room so a patient can breathe.

Dentists should also look for tongue ties. A tongue that is limited in its functional movement cannot help form and influence the maxilla during its growth. This often leads to deficient maxillary and mandibular growth in both the anterior/posterior and transverse dimensions. This is often the anatomic cause of malocclusion and the resulting airway issues. An elongated soft palate and an enlarged uvula are signs that the soft tissue may impede one’s airway. A Mallampati score should be recorded, which can serve as a predictor for sleep-disturbed breathing and potentially obstructive sleep apnea. 

How teeth can indicate airway obstruction

Finally, examinations need to observe the teeth for alignment, wear and structure. Lingual inclination can mean a transverse dimensional issue and constricted arch form. Tooth wear can show signs of erosive and pathway wear, which are often a direct result of airway issues.

Sleep-related bruxism can devastate the dentition, leading to further loss of vertical dimension and an even greater sleep-related disorder.

Bicuspid extraction was once a method many orthodontists used to compensate for skeletal issues. However, the net effect was a decrease in arch length and, ultimately, a loss of airway volume, making breathing more difficult. Vaulted palates are another example of skeletal constriction, which again decreases airway volume.

The positive effect dental care providers can have on patients’ lives is far-reaching. Helping patients lessen the risk of high blood pressure, stroke, cardiovascular disease, cancer, anxiety, dementia, Alzheimer’s and many other medical diseases can be uncovered with routine dental exams and ultimately finding ways to manage and control their airway. Understanding and treating the etiology behind a patient's dental care and treatment serves as the foundation to ensure optimal dental health. Research is now proving it is also critical to their overall health and quality of life.

More information about airway and sleep-related disorders can be found on Spear Online, which includes a video with Dr. Jeff Rouse explaining basic steps to conduct a comprehensive airway exam.

In my next article, I will review various screening tools dental providers can use to help further understand what is happening during a patient's sleep.

References

1. Effect of nasal or oral breathing route on upper airway resistance during sleep. M.F. Fitzpatrick, H. McLean, A.M. Urton, A. Tan, D. O'Donnell, H.S. Driver

2. Managing obstructive sleep apnea in children: the role of craniofacial morphology. Maria Fernanda Rabelo Bozzini and Renata Cantisani Di Francesco

Andrew B. Cohen, D.M.D.

Visiting Faculty and Contributing Author of Spear Digest


Comments

Commenter's Profile Image Shawn S.
January 10th, 2019
Excellent article Andrew. Well done in eveyway. Having just completed Jeff Rouse’s Airway Prosthodontics workshop last month, I already feel really good about starting to screen and open the discussion with patients as it relates to preventing controlling and resolving their airway and sleep disordered breathing problems. Patients have really taken a great interest in the discussions and I feel things are going in the right direction for them and me both. Thank you for doing a great overview of this topic. I look forward to the articles to follow. Best regards Shawn Silva Wolfeboro NH
Commenter's Profile Image Carlos M.
May 7th, 2019
Very interesting and very useful and clear article .Congratulation