相同倒凹深度上，磨牙金合金卡环固位力比前磨牙大。
The retention of gold alloy clasp on the molar was greater than that on the premolar in the same condition of undercut.
相同倒凹条件下，磨牙卡环的固位力比前磨牙卡环大。
The retention of the clasp on molar is greater than premolar in the same condition of undercut.
相同倒凹深度上，磨牙金合金卡环固位力比前磨牙大。
The retention of the clasp on molar is greater than premolar in the same condition of undercut.
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