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An implant to be placed at #29 can be longer (10 mm (Fig.3) vs. 8 mm at other sites, such as at #30 (Fig.3')). But it may be close to that of the neighboring site (#28). PA is taken after initial osteotomy for parallelism. The apical end of the drill may overlap with the upper border of the Inferior Alveolar Canal.
A 1-piece implant may be used at the site of #30 (Fig.3''). The initial osteotomy using 1.2 mm pilot drill should be along the lingual plate (cortical and medullary junction, Fig.3''' (red line), using a index finger along the lingual plate). The 2nd pilot drill (1.5 mm) goes down 8 mm and 2 mm for 6 mm. When the 1-piece implant (3x10 mm) is being placed, it will push the remaining medullary bone buccally (condensing effect, hopefully without pressure on the canal).
Xin Wei, DDS, PhD, MS 1st edition 07/03/2016, last revision 07/03/2016