【填空题】
9、平衡合___
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2009年名解 指全口义齿的上下相对应的牙，在正中合及下颌前伸和侧方运动时，上下颌牙能同时接触而无干扰，是全口义齿与自然牙列的主要区别。平衡使义齿在行使咀嚼功能时，能保持稳定而不脱位，从而减少无创伤，防止牙槽骨过快吸收。
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