The bone height at #19 (Fig.3) allows placement of a 4x7.3 mm equicrestal or 5.5x5 mm subcrestal (Fig.4).  A 4x8.5 mm UF implant (DIO, 1-staged ridge split) at #30 has been functionally 2 years 2 months post cementation.

Under-Prep or Size Last Xin Wei, DDS, PhD, MS 1st edition 07/27/2018, last revision 07/27/2018