母亲:医生,我发现我儿子的前牙不在正确的位置上。首先,上颌所有牙齿位于下颌牙弓的前面,这在专业术语上叫做安氏Ⅱ类错畸形。母亲:您能告诉我整个治疗所需的时间和大约的费用吗?母亲:需要多久来一次诊所?First , I have to take a series of X-ray photographs and an orthodontic model .This model will be very important in making a treatment plan .M : Can you tell ......