. 2022 Jul 6;24(5):683–695. doi: 10.1111/cid.13115

TABLE 2.

Abutment mechanical complication rate (AF and ASL) of gender, age, arch, position, type of the prosthesis, cantilever, abutment design, implant length or diameter, bone graft, type of the abutments, and duration time in Ankylos implants (n = 945)

Factor	Abutment screw loosening (%)		p value	Abutment fracture (%)			p value
Factor	No	Yes	p value	No	Yes	9 year CFR	p value
Gender
Male	491 (98.20)	9 (1.80)	0.123 ^a	489 (97.80)	11 (2.20)	4.0	0.021 ^a
Female	442 (99.33)	3 (0.67)	0.123 ^a	443 (99.55)	2 (0.45)	0.5	0.021 ^a
Age: mean ± SD (years)	52.41 ± 14.07	53.58 ± 17.26	0.447 ^b	52.41 ± 14.16	53.69 ± 9.06		0.744 ^b
Arch
Maxillary	472 (98.95)	5 (1.05)	0.539 ^a	473 (99.16)	4 (0.84)	1.3	0.152 ^a
Mandible	461 (98.50)	7 (1.50)	0.539 ^a	459 (98.08)	9 (1.92)	3.7	0.152 ^a
Position
Anterior	197 (100)	0 (0)	0.147 ^c	197 (100)	0 (0)	0	0.039 ^c
Premolar	203 (98.07)	4 (1.93)		206 (99.52)	1 (0.48)	0.9
Molar	533 (98.52)	8 (1.48)		529 (97.78)	12 (2.22)	3.7
Type of the prosthesis
ISC	470 (98.95)	5 (1.05)	0.549 ^a	464 (97.68)	11 (2.32)	4.7	0.013 ^a
IFPD	463 (98.51)	7 (1.49)	0.549 ^a	468 (99.57)	2 (0.43)	0.7	0.013 ^a
Cantilever
Yes	19 (100)	0 (0)		19 (100)	0 (0)	0	1.000 ^c
No	914 (98.70)	12 (1.30)	1.000 ^c	913 (98.60)	13 (1.40)	2.6	1.000 ^c
Abutment design
Indexed (/X)	437 (99.01)	4 (0.91)		431 (97.73)	10 (2.27)	5.4	0.027 ^a
Without index(C/)	496 (98.41)	8 (1.59)	0.351 ^a	501 (99.40)	3 (0.60)	1.0	0.027 ^a
Abutment angulation
Yes	262 (97.04)	8 (2.96)		268 (99.26)	2 (0.74)	1.0	0.369 ^a
No	671 (99.41)	4 (0.59)	0.007 ^c	664 (98.37)	11 (1.63)	2.7	0.369 ^a
Opposing jaw
Natural tooth	795 (98.64)	11 (1.36)	0.269 ^c	793 (98.39)	13 (1.61)	3.0	0.612 ^c
Implant tooth	106 (100)	0 (0)		106 (100)	0 (0)	0.0
Other conditions	32 (96.97)	1 (3.03)		33 (100)	0 (0)	0.0
Length
8 mm	96 (96.97)	3 (3.03)	0.346 ^c	95 (95.96)	4 (4.04)	8.8	0.087 ^c
9.5 mm	229 (98.71)	3 (1.29)		231 (99.57)	1 (0.43)	0.5
11 mm	549 (98.92)	6 (1.08)		547 (98.56)	8 (1.44)	2.8
14 mm	59 (100)	0 (0)		59 (100)	0 (0)	0.0
Diameter
3.5 mm	622 (99.04)	6 (0.96)	0.232 ^c	625 (99.52)	3 (0.48)	1.0	0.002 ^a
4.5 mm	311 (98.11)	6 (1.89)	0.232 ^c	307 (96.85)	10 (3.15)	4.8	0.002 ^a
Bone graft
Yes	301 (99.01)	3 (0.99)		303 (99.67)	1 (0.33)	0.7
No	632 (98.60)	9 (1.40)	0.761 ^c	629 (98.13)	12 (1.87)	3.2	0.072 ^c
Duration time: mean ± SD (months)	49.04 ± 23.37	34.67 ± 19.80	0.028 ^d	48.96 ± 23.47	41.85 ± 12.73		0.276 ^b

^{^a}

Chi‐square test.

^{^b}

Student's t‐test.

^{^c}

Fisher's precise test.

^{^d}

Mann–Whitney U test.