Bone expander kit is planned for for the case at the site of #3 with apparently normal buccolingual width (Fig.1). 

Dashed line indicates bone crack when larger expanders are being used.  Inexplicable is that the crack is NOT continuous with the osteotomy.

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Xin Wei, DDS, PhD, MS 1st edition 08/12/2014, last revision 09/30/2018