渗透性树脂对树脂修复体微渗漏影响的实验观察

目的:观察使用渗透性树脂ICON对修复体边缘进行处理后的微渗漏变化。方法:20颗健康离体牙随机分为2组,颊面制备深度2mm的窝洞,Z350树脂充填,A组使用渗透性树脂ICON处理树脂修复体边缘处的牙体组织及树脂牙体结合处,B组为对照组。37℃水浴条件下分别置于0.1%罗丹明B荧光染料浸染,24h后激光扫描共聚焦显微镜测量染液渗入深度,定量评价微渗漏程度,对检测结果进行统计学分析。结果:A、B组微渗漏差异有统计学意义(P<0.05)。结论:渗透性树脂对改善树脂修复体微渗漏状况有明显效果。     

Osteosarcoma of the jaws in children

Two cases of osteosarcoma of the jaws in children are reported. One patient was a 13-year-old girl whose first symptoms included nasal and maxillary sinus congestion, followed by epistaxis. She was found to have chondroblastic osteosarcoma extending through the left maxillary alveolar process and sinus. Following surgery and chemotherapy, the patient has been free of disease for 7 years. The second patient, an 8-year-old boy, was diagnosed with juxtacortical (parosteal) osteosarcoma of the mandible, which is a less aggressive variant of the neoplasm. It is believed that this is the youngest patient reported to date with juxtacortical osteosarcoma of the jaws. He was treated by block resection of the right side of the mandible and is free of disease 3(1/2) years later.