The bone height at #15 is unfavorable (Fig.4). Use 1.6 mm drill for 6 mm to start osteotomy (~5 mm distal to #14), followed by Magic Expanders (BEB).
Different Implant Types for Different Types of Bone
Xin Wei, DDS, PhD, MS 1st edition 10/23/2016, last revision 01/19/2018