患者男性,15岁,恒牙<img src='https://img2.soutiyun.com/shangxueba/ask/18255001-18258000/18256391/201511281015081058.jpg' />,磨牙远中关系,上颌略前突,下颌基本正常,UI-SN:105°,前牙深覆<img src='https://img2.soutiyun.com/shangxueba/ask/18255001-18258000/18256391/201511281015081058.jpg' />、深覆盖Ⅱ度,上下牙弓Ⅱ度拥挤。常见的缺隙保持器有哪些()。
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