After discussion, he agrees to have implants at #18 and 20 first.  To prevent buccal drifting of osteotomy and implant at #20, the implant will be placed lingual, but it does not contact the lingual plate (Fig.2-4). 

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Xin Wei, DDS, PhD, MS 1st edition 06/16/2020, last revision 06/16/2020