Bone expansion is not conducted at #5, since it is difficult to tap #15 blade.  When a parallel pin is placed 10 mm deep, the edentulous space at #5 is 5.5 mm mesiodistally (Fig.1). 

Narrow Space Last Next

Xin Wei, DDS, PhD, MS 1st edition 04/13/2016, last revision 06/12/2019