Table 4.

Types of cement leak

Leakage type	Group A (n = 145)	Group B (n = 125)
Canal leak	17 (11.7%)a	10 (8%)	p = 0.21
<2 mm	13	7
2–4 mm	4	3
>4 mm	0	0
Anterior–lateral leak	17 (11.7%)b	11 (8.8%)c	p = 0.28
Posterior–lateral leak	11 (7.6%)d	5 (4%)e	p = 0.16
Total screw leak no.	26 (17.9%)	17 (13.6%)	p = 0.21

^aData were presented as screw no. and leakage rate (leakage screw no./total cemented screw no.)

^bThere were 12 screws combined with canal leak, 5 screws combined with posterior–lateral leak

^cThere were six screws combined with canal leak, one screw combined with posterior–lateral leak, one screw with 3-direction leak

^dThere were two screws combined with canal leak, five screws combined with anterior–lateral leak

^eThere was one screw combined with anterior–lateral leak, one screw combined with foramen leak