Posterior panoramic X-ray taken immediately pre banding shows impaction of LL7,  blocked by LL8 (Fig.14, as compared to one 4.5 years earlier).十二岁女左下7埋伏，可能被8阻挡，所以后者必须拔除，前者牵引萌出。

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Xin Wei, DDS, PhD, MS 1st edition 06/26/2020, last revision 01/10/2021