universal matrix retainer

例句：

1. 1. The universalmatrix retainer is designed to fit snugly over the patient's teeth.
   通用矩阵保持器设计得可以紧密贴合患者的牙齿。
2. 2. This device is used to maintainthe alignment of the teeth during orthodontic treatment.
   这个设备用于正畸治疗期间保持牙齿的对齐。
3. 3. The universal matrixretainer is an important tool in thetreatment of malocclusion.
   通用矩阵保持器是治疗错颌的重要工具。