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ملفات تعريف الارتباط المستخدمة
做烤瓷牙前需要將患牙磨去一層,其主要目的有兩個: 一是使牙齒上下寬度相同或下方稍寬,保證冠戴上後與患牙密合; 二是爲烤瓷冠留出足夠空間,從而保證冠的厚度和強度。磨去的牙齒不足原長度的1/3,一般不會磨到牙神經。如果患牙是死髓牙,磨牙時沒有疼痛;如果是活髓牙,需要在磨牙前進行局部麻醉以保證無痛。
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