Fig.3: Devon's 4-year-old sister has single toothed cross bite (D, deciduous lateral incisor).  There are normal spaces between deciduous teeth.

图三：Devon四岁妹妹右上乳侧切牙反合，有正常前牙间隙

Early Ortho

Xin Wei, DDS, PhD, MS 1st edition 07/16/2013, last revision 08/25/2013