crown-block protector

例句：

1. 1. The crown-block protector is designed to keep the crown in place during the installation process.
   皇冠式保护器设计用来在安装过程中保持冠部固定。
2. 2. The crown-block protector was a revolutionary innovation that improved the durability of dental crowns.
   皇冠式保护器是一种革命性的创新，提高了牙冠的耐用性。
3. 3. The crown-block protector is commonly used in dentistry to protect the tooth structure during the preparationof dental crowns.
   皇冠式保护器在牙科中常用来保护牙齿结构，在制作牙冠时进行预备工作。