探讨下颌骨囊状膨胀性病变的X线特点、材料和方法：对经手术并病理诊断的6o例下颌骨膨胀性改变的X线片进行分析。结果：6o例中31例牙源性囊肿，2o例造轴细胞瘤；3例骨化性纤维瘤，3例纤维肉瘤、2例骨纤维异常增殖症、1例骨巨细胞瘤。结论：下颌骨膨胀性改变的X线征象差异不大。造釉细胞瘤边缘毛糙、有子囊、无骨白线或骨白线不连续，瘤体膨胀度大、可有钙化，可使牙齿松动脱落，牙根倾斜吸收具一定特征性。 X-ray features, materials and methods of mandibular cystic dilatation were analyzed: 6o cases of mandibular distensibility changes were analyzed by operation and pathology. Results: There were 31 cases of odontogenic cysts in 6o cases and 2o cases of axonal neoplasms. 3 cases of ossifying fibroma, 3 cases of fibrosarcoma, 2 cases of fibrous dysplasia and 1 case of giant cell tumor of bone. Conclusion: X-ray signs of mandibular distensibility changes little differently. Ameloblastoma rough edges, ascus, no white line or white bone line discontinuity, tumor swelling, may have calcification, can make the teeth loose off, tooth root tilt absorption with a certain characteristic.