Anteriorly, the maxillary incisors should erupt labial to the mandibular incisors; the mandibular incisors should erupt lingual to the maxillary incisors.

• 前区部方面，上颚门齿应要萌发在（下颚门齿）侧向，而下颚门齿应要萌发在（上颚门齿）侧向。