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The block will be harvested from the chin (Fig.5,6) using surgical handpiece with a new fissure bur. In fact make bony cut each one from the midline, 7x7 mm. The superior cut should be 4 mm from the apices of the lower anterior teeth to avoid neurovascular damage. Make the shallow cut and take PA for confirmation. The thickness of the graft is ~ 3 mm.
The bone is narrow apical to the tooth #5 (Fig.7), which may be the reason for the severe bone loss at #6 and 7 after extraction. It appears that the palatal apex is more or less in the center of the alveolus.
Xin Wei, DDS, PhD, MS 1st edition 05/28/2018, last revision 07/20/2018