多发性原因不明的内吸收十分罕见,国内尚未见有文献报道.笔者近遇1例,它进行性波及全部上颌切牙.现报告如下.患者女,17岁,本市学生.因(?)牙变色来我院就诊.该区牙无外伤或治疗史。牙片显示内吸收而被拔除.镜下显示内吸内,细胞性成纤维组织代替牙髓和牙本质,轻度炎症,破骨细胞活性较低,但 Multiple causes of unexplained internal absorption is very rare, there have been no reports in the country. The author nearly encountered in 1 case, it is progressive spread all the maxillary incisors. The report is as follows. Female patient, 17 years old, city students. Tooth discoloration to our hospital .This area has no history of trauma or treatment. Tooth pieces showed internal absorption and was removed. Microscope showed endocytosis, cellular fibroblasts instead of dental pulp and dentin, mild inflammation, osteoclast activity is low, but