磁铁已逐渐应用于口腔科,本文介绍一种体积小、稳定,且有较强磁场的钴钐(SmCO_5)磁铁,这种磁铁曾用于牙科修复中以固定义齿,但在正畸上很少使用。本文报告用磁铁关闭切牙间隙的初步经验。材料和方法用天平测量磁力。以胶固定下块磁铁于铜棒上,丝线固定上块磁铁于天平的一侧臂上,对侧秤盘加法码平衡,并继续加重至上下两磁铁分开,在磁铁间垫以显微镜载玻片 Magnet has been gradually applied to dentistry, this article describes a small, stable and strong magnetic field of cobalt samarium (SmCO_5) magnets, the magnets used to denture to fix the denture, but very little orthodontic use. This article reports the initial experience of closing the incisor gap with a magnet. Materials and methods Use a balance to measure magnetic force. The glue is used to fix the lower magnet on the copper rod, the thread is fixed on the arm on the side of the balance, the balance scale is added and balanced, and the weight of the upper and lower magnets are further increased to separate the magnets.