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23例患者男15例,女8例。年龄7～12岁。其中8～10岁20例,占87%。乳前牙反拾者11例,乳前牙久留10例,不良习惯1例,间隙不足1例。伴有下颌前突者9例,绝大部分是由乳前牙反(牙合)引起。典型病例: 例1:患者杨××,女,12岁。牙列式,6V4Ⅲ21 12Ⅲ4V 654021 120456反(牙合)牙21 12,Angle氏Ⅲ类。外形下颌颏部明显前突,上唇稍凹。因下颌牙整齐,反
23 patients were 15 males and 8 females. Age 7 to 12 years old. Of which 8 to 10 years old in 20 cases, accounting for 87%. Eleven milk samples were collected from the anterior teeth of the breast, 10 from the anterior teeth of the breast, 1 from the bad habit, and 1 from the gap. Accompanied by mandibular protrusion in 9 cases, most of them are caused by the anterior crossbite (occlusal). Typical cases: Example 1: Yang × ×, female, 12 years old. Dentition, 6V4Ⅲ21 12Ⅲ4V 654021 120456 Anti (occlusal) teeth 21 12, Angle class Ⅲ. Chin mandibular outline prominence, slightly concave upper lip. Due to jaw teeth neat, anti