The bone height is good (Fig.2 (red dashed line: the superior border of the Inferior Alveolar Canal)).  Implants at #30 and 31 are expected 5x12 or 14 and 5x10 or 12 mm, respectively.  The abutments are 6.8x4(2) and 6.8x4(1) mm.

Surgical Stent for Opposing Tooth Reduction

Xin Wei, DDS, PhD, MS 1st edition 12/09/2016, last revision 01/19/2018