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The lingual crest (Fig.2 (lingual view) ^, Fig.4 (L)) is lower than the buccal one. It appears that the lingual half of the tooth is lost. Note the concavity at the site of #19 while osteotomy (Fig.2 * prevent perforation).
Xin Wei, DDS, PhD, MS 1st edition 01/20/2018, last revision 01/20/2018