ball and socket base

常见例句

双语例句

• Methods The ball was placed on the root cap coping and the socket on the base of overdentures, so that we could get the retention for making use of the friction between the ball and the socket.
  方法 将球形结构安放于牙根之上，球帽安放在覆盖义齿的基托中，利用球帽与球形结构上球头之间的摩擦产生固位力。
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