The guide is reseated for final drilling until 3.5x10 mm.  The buccal plate starts to fracture when a 4x10 mm IS dummy implant is being inserted; the fracture gets worse when a 4.5x10 mm final UF implant is placed (Fig.4 ^).

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Xin Wei, DDS, PhD, MS 1st edition 08/24/2019, last revision 08/25/2019