A 60-year-old man requests implant at the site of #14 (Fig.1 (taken 4 years ago), opposing a natural tooth (Fig.7)).  Although bone height is limited, bone density appears high with sinus septi (S and black arrowheads).  Abundant septi suggest dense bone, favoring primary stability.

Sinus Septi

Xin Wei, DDS, PhD, MS 1st edition 02/15/2015, last revision 02/15/2015