intracoronal retainer

例句：

1. 1.The patient needed an intracoronal retainer to stabilize the tooth after a root canal treatment.
   患者在接受根管治疗后需要使用内冠保持器来稳定牙齿。
2. 2. The orthodontist recommended an intracoronal retainer for the patient's misaligned teeth.
   正畸医生为患者的错位牙齿推荐了内冠保持器。
3. 3. The intracoronal retainer was removed after six months, and the patient's teeth aligned perfectly.
   内冠保持器在六个月后被移除，患者的牙齿完美对齐。