Mandibular First Molar with a Single Root and Single Canal

Table 1

The variations in mandibular first molar according to different authors.

Author/year	Materials and methods	Number of teeth	Variations reported	Distribution of canals	Number of roots
Martínez-Berná and Badanelli (1985) [6]	Case report	1	6 root canals	3 mesial, 3 distal	2 roots
Beatty and Interian (1985) [5]	Case report	1	5 root canals	2 mesial, 3 distal	2 roots
Bolger and Schindler (1988) [13]	Case report	1	“C” shaped canal		2 roots
Reeh (1998) [7]	Case report	1	7 root canals	4 mesial, 3 distal	2 roots
Baugh and Wallace (2004) [8]	Case report	1	Middle mesial canal	3 mesial, 2 distal	2 roots
Ghoddusi et al. (2007) [11]	Case report	1	Four canals in distal root	2 mesial, 4 distal	4 roots
Krithikadatta et al. (2010) [15]	Case report	1	2 canals	1 mesial, 1 distal	2 roots
Kottoor et al. (2011) [23]	Case report	1	Middle distal canal	2 mesial, 3 distal	2 roots
Attam et al. (2012) [12]	Case report	3	Radix entomolaris	Distolingual root in each case	3 roots
Subbiya et al. (2013) [10]	Case report	1	Four canals in mesial root	4 mesial, 2 distal	2 roots
Reuben et al. (2008) [20]	In vitro	1/125; (Indian population)	Single canal	Single canal (in the centre of the pulp chamber)	1 root