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Table 1 The number of roots and different canal category in the maxillary second premolars [n, (%)]

From: CBCT evaluation of root canal morphology and anatomical relationship of root of maxillary second premolar to maxillary sinus in a western Chinese population

Root number

Canal category

Type I

Type II

Type III

Type IV

Type V

Type VI

Type VII

Type VIII

One root

616 (55.1)

357 (31.9)

6 (0.6)

52 (4.7)

16 (1.4)

5 (0.4)

1 (0.1)

0

Two roots

0

0

0

62 (5.5)

1 (0.1)

0

0

2 (0.2)

Total

616 (55.1)

357 (31.9)

6 (0.6)

114 (10.2)

17 (1.5)

5 (0.4)

1 (0.1)

2 (0.2)