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When the residual roots of the tooth #30 (Fig.1) are removed, the buccal crest is found ~ 2 mm apical to the lingual one (Fig.2 <); while the initial depth of osteotomy is 11.5 mm (yellow lines), the parallel pin is 10 mm long.
Xin Wei, DDS, PhD, MS 1st edition 11/16/2017, last revision 06/17/2018