阿摩線上測驗
10.下列何種情形不符合主動性維持器（active retainer）的定義？
(A)以環繞式維持器（wraparound retainer）關閉剩餘微小空隙
(B)維持器加入彈線（spring），可重新排列前牙凌亂擁擠
(C)以功能性矯正裝置（functional appliance）控制因生長造成的復發（relapse）
(D)以固定式維持器（fixed retainer）黏著臨時性牙橋（temporary bonded bridge）保持缺牙空間
答案：登入後查看
統計： A(14), B(40), C(169), D(641), E(0) #3200108
統計： A(14), B(40), C(169), D(641), E(0) #3200108
詳解 (共 3 筆)
比我晚考的都大bg
#6166011
附上原文，假裝自己看懂了:
“Active retainer” is a contradiction in terms because a device cannot
be actively moving teeth and serving as a retainer at the same time.
It does happen, however, that relapse or growth changes after
orthodontic treatment lead to a need for some tooth movement
during retention. This usually is accomplished with a removable
appliance that continues as a retainer after it has repositioned the
teeth; hence the name. A typical Hawley retainer, if used initially
to close a small amount of band space, can be considered an active
retainer, but the term usually is reserved for two specific situations: realignment of irregular incisors with spring retainers and management of Class II or Class III relapse tendencies with modified
functional appliances.
be actively moving teeth and serving as a retainer at the same time.
It does happen, however, that relapse or growth changes after
orthodontic treatment lead to a need for some tooth movement
during retention. This usually is accomplished with a removable
appliance that continues as a retainer after it has repositioned the
teeth; hence the name. A typical Hawley retainer, if used initially
to close a small amount of band space, can be considered an active
retainer, but the term usually is reserved for two specific situations: realignment of irregular incisors with spring retainers and management of Class II or Class III relapse tendencies with modified
functional appliances.
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