六岁左右,孩子长出第一颗恒磨牙,俗称“六龄牙”。 “六龄牙”担负着主要咀嚼功能。正常情况下,六龄牙的牙冠最大,牙尖最多,咀嚼面积最大。六龄牙是牙弓的主要支柱,对于保持上下牙弓间的关系和维持面部1/3部分的高度起着重要作用,因此人们将“六龄牙”作 Six years old, children grow the first permanent molars, commonly known as “six-year-old teeth.” “Six teeth” is responsible for the main chewing function. Under normal circumstances, six-year-old tooth crown the largest, most cusps, chewing the largest area. Six-year-old teeth are the main pillars of the dental arch, which plays an important role in maintaining the relationship between the upper and lower dental arch and maintaining the height of the 1/3 part of the face. Therefore,