intra-radicular retainer

例句：

1. 1. The patient was placed in a prone position for the intra-radicular retainer placement.
   患者被安置在仰卧位以便进行内辐射固定器的植入。
2. 2.The procedure involves removing the tooth and placing the intra-radicular retainer to stabilize it.
   该过程包括移除牙齿并放置内辐射固定器以稳定它。
3. 3. The intra-radicular retainer is designed to prevent movement of the root canal filling material.
   内辐射固定器的设计目的是防止根管填充材料的移动。