Document oM9wjxy4xrqQ4k0ZM85QQ4jmo

V IS IB LE M ASKS OF OCCUPATIONAL DISEASES Discolored and mottled teeth. Speech defects (not visible de fects). Goiter (hyperthyroidism). Salivation. Mouth breathing (open mouth). Breath (garlic odor). "Phossy Jaw." Fluorine is the cause of character istic mottling, but many metals such as copper and iron bring about diffused coloration. Highly varied causes--brain tu mors, syphilis, neuroses, fa tigue, etc. Enlarged thyroid gland. Industrial causes--mercury, po tassium chlorate, phosphorus, copper, bromides. Numerous causes unrelated to work, such as adenoids. If as sociated with dyspnea, may be caused by silicosis, which is rare. If not garlic, then possibly tel lurium, selenium, or arsenic. Yellow phosphorus. Apparently no great harm pro duced by many forms of teeth coloration. Stammering, slurred speech, mo notonous speech, explosive speech, aphonia, etc. R. M. I. Common as simple goiter due to iodine deficiency. Also toxic goiter from hyperthyroidism. R. M. I. Excessive formation of saliva. R. M. I. Mouth breathing may be caused by nasal obstruction. R. M. I. Persists months after termina tion of exposure. Deformity from necrosis of facial bones, chiefly lower maxillary. Smoking, and particularly pipe smoking, may lead to black deposits on teeth. Stammering may be related to improper management in child hood of left-handedness. More common in women. Scores of nonindustrial causes, such as Vincent's angina, mumps, cancer, syphilis, scurvy, etc. If related to recent injury to face, suspect dislocation of jaw. Disappears after increased intake of ascorbic acid. Odor will return unless use of ascorbic acid is long continued. Condition now rare. Formerly common among match makers, fireworks manufacturers, rarely fertilizer operatives. Chest Bulging of breast bone (ster num). If associated with pulsation, suspent aneurysm; if chicken- oreast-like, suspect rickets; if series of knobs on either side at rib section, suspect rickets. Any marked external protrusion should lead to medical observa- tion. Converse picture that of de pressed sternum frequently called "cobbler's chest" asso ciated with shoemakers' trade as cause. Now rare. Extremities Apart from Skin Ganglion (ganglia). Cysts in the region of joint capsules and tendon Bheaths. May occur along any tendon sheath or about many joints but more common on hands and feet; may be either indus trial or nonindustrial. Frequently attributed to coarse vibration as from pneumatic tools. (continued)