Table 2.

Classification of root canal shapes of maxillary first premolars and rate of occurrence of each type

Root canal shapes	No. of occurrences	Rate of occurrence (%)
1-1-1	32	25.6
1-1-2	1	0.8
1-2-1	4	3.2
1-2-2	5	4.0
2-1-1	11	8.8
2-1-2	0	0
2-2-1	23	18.4
2-2-2	47	37.6
2-3-3	1	0.8
3-3-3	1	0.8
Total	125	100

The figure of the root canal shapes from the left side presented the number of the root canals at cervical one-third, center and apical one-third, respectively.