作者研究从事硝酸铵和氨化过磷酸盐生产的工人口腔粘膜白斑病的发病情况,并和没有职业性危害的工人进行对照。用通用的临床方法检查口腔,用吸入法测定工作区空气中过多的粉尘和气体,随后取试样作化学分析。粘膜白斑病常定位于红唇缘和唇粘膜,沿牙齿咬合线的颊粘膜,邻近口角处;较少在舌和口底。有白斑病的人,大多数在30岁以上,有5～30年工龄。 The authors studied the incidence of oral leukoplakia in workers engaged in ammonium nitrate and ammoniated perphosphate production and compared them to those without occupational hazards. The buccal cavity is examined by a common clinical procedure and excess dust and gas in the air of the work area are measured by inhalation followed by chemical analysis of the specimen. Leukoplakia is often located on the lips and lip mucosa, along the buccal mucosa of the occlusal line, near the mouth and mouth; less in the tongue and mouth. White spot disease, most of them over the age of 30, 5 to 30 years of service.