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Twin block A twin block is an orthodontic appliance. Its purpose is to lengthen the lower jaw by posturing it forward. If the jaw grows during treatment, it naturally grows at a faster rate; otherwise the appliance is useless. Treatment time varies, but is generally around 9 months. ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Twin block」の詳細全文を読む
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