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It's very important to make a space maintainer if the second deciduous molar is lost too soon.
假如第二颗乳牙过早脱落，那摸装上间隙保持器是件要紧的事。
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Objective:To observe the clinical application and effect of the transparent pressure- swage space maintainer.
目的：探讨透明压模式缺隙保持器的临床应用及效果。
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