一个常见的问题是由孔的边缘不整齐或者纸带不干净所引起的。
A typital problem is caused by the ragged edges of the holes, or by dirt on the tape.
植入6个月后，两端的新骨向中心区生长，材料开始降解，边缘出现不整齐状。
After 6 months, the new bone grows towards the implanted material, and at the same time the material begins to degrade and the fringe becomes irregular.
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