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Management of Hyposalivation and Xerostomia: Criteria for Treatment Strategies Joel B

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Management of Hyposalivation and Xerostomia: Criteria for Treatment Strategies Joel B REVIEW HY POSALIVATION/XEROSTOMIA Management of Hyposalivation and Xerostomia: Criteria for Treatment Strategies Joel B. Epstein, DMD, MSD, FRCD(C), FDS RCS(Edin); and Siri Beier Jensen, DDS, PhD Abstract: Saliva management in patients with hyposalivation is potentially complex. Future develop- ment of oral care products and treatment strategies requires attention to the biology of saliva and the best means of providing a continuum of relief for people with xerostomia—the sensation of dry mouth— and hyposalivation—documented reduction in saliva flow. Improvement in patient care requires that clinicians be aware of approaches to management, desirable qualities of methods and products, and that they seek the development of products that support the functions of saliva and promote comfort and health. In this brief review of the epidemiology of hyposalivation, the biology and functions of saliva are presented in order to guide clinical decision-making to address the needs of patients with dry mouth. aliva supports the health of the oral environment and activity (sympathetic and parasympathetic nervous regulation), oral function in communication, eating, clearing the while the stimulated state is present for only a few hours in relation oral cavity, and swallowing. It hydrates, maintains, and to masticatory and/or gustatory stimulation with up-regulation of lubricates oral soft tissue, and supports mineralization parasympathetic stimulation. Thus, the resting state has the highest of teeth, reduces infection and promotes healing and maintenance of oral mucosa. It is for these reasons, xerostomia and S TABLE 1 hyposalivation—both of which are common conditions—can greatly impact quality of life as well as oral and, potentially, systemic health. Biologic Functions of Saliva The complex functions of saliva may be maintained in patients with hyposalivation if adequate stimulation of residual function Surface wetting, diluting, clearing, facilitating taste, is possible. However, when saliva stimulation is not sufficient, the bolus formation goals of therapy—which may include use of long-acting topical Lubrication (mucin): speech, swallowing, products—would be to provide: saliva enhancement; surface wet- prosthesis function ting; lubrication; tissue hydration, dental mineralization; impact Barrier function (mucin, wetting) on oral flora; and clearance of saliva from the oral cavity. Mucosal protection: growth factors, (mucin), hydration Facilitating mucosal maintenance, regeneration, and repair Biology of Saliva Antimicrobial effects: innate, acquired Saliva is a complex biologic fluid with multiple functions (Table 1 and Table 2). The principle goal of management of xerostomia is Adherence, clearing, antimicrobial factors (polypeptides, defensins, enzymes, etc), antibodies to provide symptomatic care on an ongoing 24-hour basis and, in the case of concomitant salivary gland hypofunction, to address Dental hard tissue maintenance: pH, remineralization, diluting, clearing the loss of important biologic functions of saliva. Saliva is subject to diurnal variation, with reduction in saliva at Other: Initiate digestion, social role; texture/viscosity; clearing medications (saliva secretion, swallowing) night; dry-mouth complaints may be aggravated during extend- ed-time speaking and at night, causing a disturbed sleep pattern. Sensory/subjective functions of saliva: Salivary glands are in a resting state for most of a 24-hour day, Wetting, comfort, thirst, mucosal sensitivity, facilitating with a continuous relatively low flow rate induced by autonomic taste, swallow function, speech 2 COMPENDIUM June 2015 Volume 36, Number 6 impact on overall xerostomia, general oral well being, and the oral TABLE 2 condition. Resting saliva is composed primarily of mucinous secre- tion from the submandibular, sublingual, and minor salivary glands, Impact of Salivary Dysfunction with a limited serous component. The minor salivary glands contribute 70% of the total amount Symptoms: of mucins in whole saliva while only contributing 10% of the fluid Dry mouth (xerostomia) secretion. Mucin appears critical in the mucosal barrier, lubrication, Dysphagia and forming the salivary pellicle on teeth. Stimulated saliva is largely Dysphonia made up of serous secretions primarily from the parotids, which are Odynophagia increased with chewing and eating; it contributes a total of 50% of the stimulated whole-saliva volume, while the parotids contribute Altered/reduced taste 20% during rest. Mucosal sensitivity/burning sensation In addition to salivary volume, texture and viscosity are criti- Difficulty in wearing dentures cal concerns frequently not considered in the clinical setting. For Local disease: example, during head and neck radiation therapy, reduced serous Dental demineralization/caries secretion may lead to an increase in mucinous viscous saliva, which can be difficult to manage, may aggravate nausea, and can sometimes Dental erosion be associated with greater complaints than reduction in overall Dental hypersensitivity secretions that may follow continuing cancer care. In addition, ex- Halitosis cessive mucin may be difficult for the patient to manage and may be Atrophic and red oral mucosa of increased concern at night, thereby affecting sleep. This aspect Traumatic mucosal ulceration of salivary gland dysfunction is occasionally addressed by use of Cracked lips mucolytic drugs; however, currently available products have limited efficacy and further development is needed. Angular cheilitis Microbial shifts: candida infection, gingivitis, periodontitis, Patient Report other pathogens A patient presented with xerostomia, hyposalivation, and excessive Systemic impact: mucin following intensity-modulated radiation therapy for cancer Pharyngitis/laryngitis of the left maxillary sinus. Although the mucositis resolved, the Acid reflux/esophagitis patient had persistent severe xerostomia and hyposalivation with thickened secretions. Sialometry showed a resting whole-saliva Dietary accommodations/nutritional intake flow rate of 0 ml/min and a stimulated whole-saliva flow rate of Infection 0.20 ml/min. In some areas of the mouth and throat, the viscous Social impact–social and role function: saliva became crusts of dried salivary mucins, causing nausea and Speech, taste, diet, pain discomfort, which affected the patient’s sleep. Impaired quality of life The salivary gland dysfunction had caused extensive tooth dam- age due to mineral loss, cavitation, and chronic oral fungal infection. Quality of life was severely impaired due to the sensitive and dry min for resting whole saliva and/or ≤ 0.7 ml/min for stimulated mouth; loss of taste; impaired speech, chewing, and swallowing; whole saliva)2; furthermore, reduction in saliva from prior levels and disturbed sleep. The patient was able to receive limited short- not necessarily below these thresholds may result in negative health term relief by sucking on fluoride-containing tablets designed for outcomes. It is important to note that while they are often corre- dry-mouth patients. Due to tooth loss, chewing gum was not an lated, salivary gland hypofunction and xerostomia are not always option, and the patient disliked the taste and consistency of a gel related. For example, over time, patients with hyposalivation may product, which also caused nausea; the patient preferred to use become accustomed to the reduced saliva production and report water frequently applied by a spray bottle at 10-minute intervals. less concern with xerostomia; however, oral complications of hy- Available mucolytic drugs were ineffective. posalivation can continue. Also, patients may report xerostomia with normal quantity of saliva production, which may represent Prevalence and Morbidity changed composition of saliva—eg, lubricating proteins, or mucosal Like the aforementioned patient, there are many people affected sensory change such as in some cases of burning-mouth syndrome. by xerostomia and salivary gland hypofunction (Table 3). It has Therefore, in evaluation of saliva and its multiple functions, both been estimated that up to 20% of a population-at-large suffer from subjective and objective saliva evaluation may be required. xerostomia,1 which is the subjective sensation of dry mouth. It is distinct from salivary gland hypofunction, which is objectively Symptom Management Considerations decreased volume of secreted saliva, and hyposalivation, which is The ideal products and protocols for management would provide defined as a pathologic reduction in salivary secretion ≤( 0.1 ml/ a continuum of care 24 hours a day. Due to the lubricating and www.compendiumlive.com June 2015 COMPENDIUM 3 reVIEW | HYPOSALIVATION/XEROSTOMIA TABLE 3 gland hypofunction—whether due to inhibition of salivary gland secretion or destruction of gland tissue—and individual patient Populations At-Risk for Hyposalivation preferences of application, texture, and flavor. Also, due to the diurnal variation and patients’ lifestyle habits, the Medication-related need for relief may vary during the day, and different products or for- Diabetes mellitus mulations may be helpful at different times of the day. For example, oral rinses, lozenges, or chewing gum may assist when awake, but Autoimmune longer-duration products such as an oral gel or molecular enhanced Sjögren’s syndrome substance may be more helpful at night. This may also vary with the Connective tissue disease, eg, systemic lupus severity of salivary gland hypofunction—that is, stimulation of secre- erythematosus
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