Fig.4,5: Devon, 5 years old, axes of upper centrals are divergent (black lines).  There are no normal spaces between deciduous teeth.

图四，五：Devon，五岁，上，下前牙根尖片，上中切牙牙胚长轴异常（斜线），乳前牙之间没有空隙

Early Ortho

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