英语语法分析

It has better toughness with 20% nano-zirconia, is suitable dental all-ceramic restoratives.

纳米氧化锆含量为20%时，具有较好的增韧效果，适合口腔修复材料。

Objective: to repair the porcelain fused to metal restoratives of unlocking porcelain directly in mouth.

目的：直接在口腔内修补脱瓷的金属烤瓷冠桥。

The quality of impression plays a very important role in the accuracy and quality of the final restoratives.

口腔印模的质量直接影响修复体的准确性和修复质量。