[舉手] 申複
臨床（四）第15題
若下頷門牙經齒顎矯正10年後又發生擁擠現象,則下列因素與其關係最為密切?
因為題意並沒有提及病人年齡
即與操作層序失誤或是在一般狀況下
若是沒帶retainer
就可能因老化造成下頷前牙擁擠,所以c選項也有可能
contemporary orthodontics p108 右中文字
In modern population ,there is a strong tendency for crowding of the mandibular incisor teeth to develop in the late teens and early twenties , no matter how well aligned the teeth were initially.
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