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Table 2 Angle characteristics according to angle group and teeth type (mean ± SD)

From: Analysis of the sagittal root angle and its correlation with hard and soft tissue indices in anterior teeth for immediate implant evaluation: a retrospective study

Angle group

Angle (n, %row)

Center incisor

Lateral incisor

Overall

 < 0°

 − 3.87 ± 2.90 (8, 2%)

 − 0.12 (1, 0.25%)

 − 3.45 ± 2.99 (9, 1.12%)

 ≥ 0° < 5°

3.33 ± 1.20 (28, 7%)

2.73 ± 1.33 (8, 2%)

3.20 ± 1.24 (36, 4.5%)

 ≥ 5° < 10°

7.87 ± 1.36 (61, 15.25%)

8.41 ± 1.35 (28, 7%)

8.04 ± 1.37 (89, 11.13%)

 ≥ 10° < 15°

12.66 ± 1.41 (100, 25%)

13.03 ± 1.46 (86, 21.5%)

12.83 ± 1.44 (186, 23.25%)

 ≥ 15° < 20°

17.66 ± 1.38 (105, 26.25%)

17.30 ± 1.44 (117, 29.25%)

17.47 ± 1.42 (222, 27.75%)

 ≥ 20° < 25°

22.28 ± 1.43 (62, 15.5%)

22.53 ± 1.41 (75, 18.75%)

22.42 ± 1.42 (137, 17.13%)

 ≥ 25° < 30°

27.03 ± 1.22 (25, 6.25%)

27.24 ± 1.36 (47, 11.75%)

27.17 ± 1.31 (72, 9%)

 ≥ 30°

34.35 ± 5.87 (11, 2.75%)

33.97 ± 3.50 (38, 9.5%)

34.05 ± 4.08 (49, 6.13%)

Overall

15.24 ± 7.62 (400, 100%)

19.16 ± 7.56 (400, 100%)

17.20 ± 7.84 (800, 100%)

  1. n indicates no. of involved teeth