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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)