Table 3.

Summary of exvivo studies reporting a deep mesial radicular invagination in mandibular premolars.

Population	Incidence	Tooth type	References
India	14%	1st premolar	Velmurugan and Sandhya [18], 2009
	14%	1st premolar	Sandhya et al. [16], 2010
	15.21%	1st premolar	Jain and Bahuguna [20], 2011
China	27.8%	1st premolar	Liu et al. [24], 2013
Jordan	17.6%	1st premolar	Awawdeh and Al-Qudah [33], 2008
	13.5%	2nd premolar
Austria	15%	1st premolar	Robinson et al. [42], 2002