Probably due to severe infection at #19, pain control is difficult.  Osteotomy has to be stopped 1.5 mm short of the design, as compared with Fig.3.  PA taken with a 4.5x10 mm dummy implant does not show the Inferior Alveolar Canal (Fig.1), whereas CT does (Fig.2).   

Repair of Dual Defects   第一磨牙即种  Last   Next Xin Wei, DDS, PhD, MS 1st edition 02/08/2019, last revision 04/28/2021