Since there is ~ 2 mm bone apical to the 5x8 mm loose implant at #19 (Fig.1), primary stability is achieved for a 4.5x10 mm dummy implant when osteotomy is finished with a 4 mm drill (Fig.2). 

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Xin Wei, DDS, PhD, MS 1st edition 08/12/2019, last revision 08/12/2019