Under the improved therapeutics of the present day mercurial stomatitis almost always terminates in recovery, especially if it receive early and prompt attention. Neglected or improperly managed, it may terminate in serious losses of tissue in gums, cheeks, teeth, and bone, leaving the parts much deformed and the patient in a permanently enfeebled condition.
Erysipelas, metastatic abscesses, inflammations, pyæmia, or colliquative diarrhoea may be mentioned as complications which may prove sufficiently serious to produce death, independently of the virulence of the primary stomatitis.
PATHOLOGY AND MORBID ANATOMY.—Mercurial stomatitis is an ulcerative process attended with an excessive flow of saliva containing mercury. It has a tendency to terminate in destruction and exfoliation of the mucous membrane of the gums and other tissues attacked, and eventually in necrosis of the jaw-bone. The detritus is found, microscopically, to consist of granular masses of broken-down tissue, swarming with bacteria and micrococci, and containing some blood-cells and many pus-cells. In some instances micrococci have been detected in the blood.
The disease usually begins in the gums of the lower incisors, and extends backward, often being confined to one side of the jaw. The gums, first swollen and then livid, become separated from the necks of the teeth. Their edges undergo ulceration. The ulcers are surrounded by fungous margins, pale or red, which bleed on the slightest contact, and some become covered with grayish-yellow detritus. The ulceration extends in depth, destroying the supports of the teeth, so that they become loosened and even detached. The inflammatory process extends to the lips, the cheek, and the tongue, which undergo tumefaction and exhibit the impressions of the teeth in grayish opalescent lines or festoons of thickened epithelium at the points of pressure. The glossitis may become intense. It is almost always present, to some extent, as a superficial or mucous glossitis. Occasionally acute oedematous glossitis has ensued, and such cases sometimes terminate fatally. Ulceration takes place in these structures similar to that which has taken place in the gums. If not arrested, gangrenous destruction ensues, not only in these tissues, but beneath them. Thus, the teeth become loosened, and even detached; the jaw-bones themselves may become bared, necrosed, and in part exfoliated; and the cheeks undergo partial destruction by gangrene. Sometimes the inflammation descends to the larynx, and this may produce oedematous infiltration of the loose connective tissue of that structure. Sometimes it mounts the pharynx and reaches the orifices of the Eustachian tubes. The salivary glands become swollen and discharge great quantities of fluid, as detailed under Symptomatology. The retro-maxillary and submaxillary lymphatic glands become enlarged by inflammatory action.
DIAGNOSIS.—In the earliest stages the inflammation of the gums in mercurial stomatitis cannot be distinguished from that which takes place in other forms of ulcerative stomatitis. The fetor of the breath, however, the profuse salivation, and the chemical reaction of the saliva, together with the history of exposure to mercury, soon place the nature of the case beyond doubt. Similar results following poisonings by copper salts and by phosphorus are differentiated by the history of the special exposure.
PROGNOSIS.—In mild cases the prognosis is favorable, provided further exposure to the cause can be avoided. This holds good almost invariably in cases due to over-medication with mercurials, but is far less applicable to cases in artisans, the result of prolonged exposure to the poisonous influences of mercury and its slow absorption. On the whole, the affection is much less serious than formerly, both because it can, in great measure, be guarded against by proper prophylaxis in risky vocations, and because its treatment has been made much more efficient. In severe cases serious results may ensue despite the most judicious treatment, and convalescence is usually very slow, weeks often elapsing before solid food can be chewed without pain or without injury to the gums.
When death ensues, it may be by asthenia, erysipelas, pneumonia, pyæmia, or colliquative diarrhoea.
TREATMENT.—Mercurial stomatitis may sometimes be prevented by the administration of potassium chlorate during exposure. Mild cases following the administration of mercurials often subside upon mere withdrawal of the drug. Should spontaneous subsidence not take place, the administration of potassium chlorate every few hours, in doses of from thirty to sixty grains or more in the twenty-four hours, soon effects amelioration, which promptly terminates in recovery. The characteristic fetor often ceases within twelve hours' use of this drug. Should the inflammatory manifestations be severe, a few leeches applied beneath the edge of the lower jaw, followed by a poultice enveloping the neck to promote further flow of blood, often affords prompt relief (Watson). Lead acetate (ten grains to the ounce of water) and iodine (half a fluidrachm of the compound tincture to the ounce of water) are useful as gargles and washes. When the result of slow poisoning, elimination of the mercury by sulphur vapor baths and the administration of small doses of potassium iodide are recommended.
Cauterization of the ulcerated surfaces is sometimes serviceable, silver nitrate or hydrochloric acid (Ricord), or chromic acid 1:5 (Butlin, Canquil), being used for the purpose.
Opium in decided doses is indicated for the relief of pain. It may be added with advantage to detergent and disinfective mouth-washes (potassium chlorate, sodium borate, creasote-water, saponified emulsion of coal-tar, tincture of cinchona, tincture of myrrh, etc.), the use of which should form an important part of the treatment. Watson highly recommended a wash of gargle of brandy and water, 1:4 or 5. In severe cases difficulty is encountered in maintaining effective alimentation. When mastication is not impracticable, soft-boiled egg and finely-chopped raw beef may be given. When the patient cannot chew at all, resort is confined to milk, soups, and the juice of beef. Nourishing enemata should be administered, as in all affections where it becomes impracticable to sustain the patient by way of the mouth. Tonics and stimulants are indicated to avoid debility from the excessive salivation and its sequelæ—quinia, coffee, wine, and alcohol, the first, if required, by hypodermatic injection, all of them by enema if necessary.