【单选题】【消耗次数:1】
下列不属于自然保持范畴的是()
依靠肌功能保持
依靠咬合关系保持
依靠健康的牙周组织保持
依靠拔牙保持
依靠功能性矫治器保持
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②  B.水
③  C.食物
④  D.药品
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【单选题】 错颌畸形治疗后的自然保持方式有
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②  T触发器
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