Table 1 Patient and implant characteristics

Mean age, years

65,8 ± 11.6

64,5 ± 13.6

0.722

Sex

0.172

 Female

14 (61%)

8 (40%)

 Male

9 (39%)

12 (60%)

Smoking

0.541

 Smoker

4 (17%)

5 (25%)

 Non-smoker

19 (83%)

15 (75%)

Stage of periodontitis

0.191

 Stage I/Stage II

7 (30%)

10 (55%)

 Stage III/Stage IV

16 (70%)

10 (45%)

Location

0.224

 Maxilla

22 (71%)

26 (84%)

 Mandibula

9 (29%)

5 (16%)

Brand

0.412

 Straumann

12 (39%)

8 (26%)

 Brånemark/Nobel Biocare

17 (55%)

22 (71%)

 Another system

2 (6%)

1 (3%)

Years in function

0.392

 < 5 years

6 (20%)

2 (7%)

 5 – 10 years

8 (26%)

9 (29%)

 10 – 15 years

7 (22%)

11(35%)

 > 15 years

10 (32%)

9 (29%)

Implant length

0.554

 < 10 mm

1 (3%)

2 (7%)

 ≥ 10 mm

30 (97%)

29 (93%)

0.576

Keratinized mucosa width

 < 2 mm

10 (32%)

8 (26%)

 ≥ 2 mm

21 (68%)

23 (74%)

Crown/bridge connection

0.587

 Screw-retained

20 (65%)

22 (71%)

 Cemented

11 (35%)

9 (29%)