The disadvantages of Admas clasp include inconvenient manual adjustment and being unsuitable to the deciduous molars.The modified Admas clasp can overcome the shortcomings.%Admas氏卡环(改良式箭头卡)是活动式矫正器常用的固位装置.临床实践证明对于缺乏倒凹的乳磨牙,其固位力常显不足.长箭头卡是Admas氏卡环的改进,它能有效地克服此种缺陷.
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