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When the alveolar crest is exposed, osteotomy starts palatally as planned. It appears that the tip of 1.2 mm pilot drill perforates the buccal plate at the buccal undercut area at the depth of 10 mm. The drill is re-directed with the coronal end of the drill is deviated buccally (Fig.1). Then the depth is extended to 12 mm, followed by 1.5 mm drill at 10 mm and 2 mm at 8 mm. A 2.5x12 mm 1 piece implant is placed (Fig.2).
The patient returns for final impression 5 months postop: there is minimal bone resorption at the distal crest (Fig.10).
Xin Wei, DDS, PhD, MS 1st edition 04/08/2015, last revision 08/05/2018