Table 2 Preoperative radiologic parameters of the two cohorts

Number

75

51

Canal-calcar ratio (CCR)

0.40 ± 0.06

0.36 ± 0.05

< 0.001

Canal-flare index (CFI)

4.45 ± 0.60

4.85 ± 0.71

< 0.001

Modified morphological cortical index

2.27 ± 0.30

2.53 ± 0.30

< 0.001

LT-to-distal ratio-α (LDR-α)

1.50 ± 0.12

1.62 ± 0.16

< 0.001

LT-to-distal ratio-β (LDR-β)

1.74 ± 0.15

1.92 ± 0.20

< 0.001