北大一院成功开展枕颈融合术 命。对先天性寰枕融合、寰枢椎不稳定患 者进行植骨融合的绝对手术指征为：脊髓病临床症状及体征的出现、寰齿间隙（ atlantodensinterval，ADI）大于四毫米及脊髓周围三分之一间隙（ASC）的减 小。 该科专家指出，上颈段（颈一、二）被称为“
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牙齿间隙大的 gap-toothed
义齿间隙 denture space
飞轮齿圈轮齿间隙 flywheel ring gear tooth clearance
齿侧间隙 Gear backlash ; backlash in circular tooth ; Meshing-Teeth Side Clearance
脱粒滚筒的钉齿间隙 cylinder clearance
齿顶间隙 tip clearance ; [机] top clearance of tooth ; teeth Tip clearance ; [机] gear tip clearance
齿轮间隙 gear backlash ; gear clearance
前臼齿间隙 premolar carrying space
两齿间隙缝很大的 gap-toothed
齿突侧距不对称15例； 寰齿间隙增宽合并骨折8例。
There were 15 cases with deviation of the odontoid process and 8 with widened atlantodentilis.
牵引产生的牙齿间隙经术后正畸完全关闭，上颌前牙列排齐。
The dental space was closed completely after postoperative orthodontic therapy, the maxillary dentition was regularly arranged.
目前，国内在航空发动机篦齿间隙测量的研究上还处于刚起步阶段。
The study on measuring the clearance of labyrinth now is at the infant stage at home.
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