1937年口腔医师开始采用聚甲基丙烯酸甲酯后不久,便发现义齿碎块有可能通过进食和呼吸进入胃肠和肺部。据报道,吸入义齿碎块的患者中。死亡率达10％,估计牙源性的异物吸入或吞入的比率约为3％。多数牙源性吸入碎块来自上颌前牙活动局部义齿。如果是微小的形状规则的异物,常会顺利通过消化道。但若异物形状奇异,如一般义齿基托碎块,就易滞留在某些狭窄处。如食管、幽门、回肠、结肠瓣或肛门 Shortly after the dentist started using polymethylmethacrylate in 1937, it was found that the denture fragments could enter the gastrointestinal tract and lungs by eating and breathing. It is reported that inhaled patients in the denture fragments. With a 10% mortality rate, it is estimated that the rate of inhalation or ingestion of alien foreign material is about 3%. Most odontogenic inhalation fragments come from the maxillary anterior dentition. If it is a tiny foreign body of regular shape, often pass the digestive tract smoothly. However, if the shape of strange foreign body, such as general denture base pieces, it is easy to stay in some of the stenosis. Such as the esophagus, pylorus, ileum, colon valve or anus