Fig.7: 3 and 3.5 mm reamers at the sites of #19 and 18, respectively (~ 11 mm in bone).

The osteotomy at #18 should have been moved mesially with change of the trajectory. 

Implants in Narrow Ridge 

Xin Wei, DDS, PhD, MS 1st edition 12/25/2015, last revision 01/19/2018