Expansion joints in the column joints have core column connection column from top to bottom, usually designed to be movable joints.
伸缩缝处立柱接头有芯柱连接上下柱，通常设计为可活动的接头。
To investigate the clinical effects of dental implantation after column hole shape endosseous expansion in alveoli of anterior maxilla.
观察上颌前部牙槽骨内圆柱洞形扩宽后行同期人工牙种植的临床效果。
Therefore, analysis of the reasons for column expansion tank, in order to reduce the cover stent expansion tank column to provide a strong reference.
因此分析了立柱胀缸的原因，为减少掩护式支架立柱胀缸问题提供了有力参考。
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