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为多根牙制作桩和核是个复杂的问题,本文介绍一种直接的方法,它可利用每个根管的最大长度,而不管根分叉的程度。此法一般多用于两个根管,也可用于三个根。有时在半切牙齿的每个牙根内有狭窄而不平行的根管,它不能用常法制作铸造桩和核,使用两个根管可增加固位和增进修复体的预后。方法1.扩大根管,使长度和直径达到要求。桩的预备大约是临床牙冠的长度。但在分叉的根,使用较短的桩也可有足够的固位。当根管能扩大到80号根管锉的大小时,就可获得最好的效果。2.按固位体的要求预备牙体至适当的外形。3.选择一个较大的根管作主根管,预备
Making piles and cores for multiple teeth is a complex issue and this article presents a straightforward approach that takes advantage of the maximum length of each root canal regardless of the extent to which the root diverges. This method is generally used for two more root canal can also be used for three roots. Sometimes there is a narrow, non-parallel root canal in each root of a half-cut tooth. It can not be used to make cast piles and cores. The use of two root canals increases retention and improves the prognosis of the prosthesis. Method 1. Expand the root canal so that the length and diameter meet the requirements. The pile preparation is about the length of the clinical crown. But at the bifurcated root, shorter stakes may have sufficient retention. When the root canal can be expanded to the size of 80 root canal file, you can get the best results. 2. Prepare the tooth according to the requirements of the retainer to the proper shape. 3. Choose a larger root canal for primary root canal preparation