The Zuckerkandl's tubercle is a small cervical tubercleAm J Phys Anthropol. 2011 Feb;144(2):204-14. doi: 10.1002/ajpa.21386. Epub 2010 Aug 25. at the mesiobuccal crown margin of maxillary and mandibular deciduous first molars over the mesial root.Dental Anthropology Simon Hillson p.67 The Juvenile Skeleton p.161 A Dictionary of Dentistry (Oxford Quick Reference) It is one of the key identifying features of the teeth. The tubercle is always present, regardless of age or ethnicity
See also Cusp of Carabelli References