matrix retainer

例句：

1. 1.The matrix retainer was designed to support the patient's jaw during the procedure.
   矩阵保持器被设计来在手术过程中支撑患者的下巴。
2. 2. The dentist used a matrix retainer to stabilize the tooth before it was extracted.
   牙医使用一个矩阵保持器来稳定牙齿，以便在拔除前进行操作。
3. 3. The patient had to wear a matrix retainer for several months after the surgery.
   患者在手术后的几个月内必须佩戴矩阵保持器。