. 2024 Nov 12;10:52. doi: 10.1186/s40729-024-00575-6

Table 4.

Changes of KT width over a 24-month follow-up period

Patient-level	Change Baseline − 12 months	Change Baseline − 24 months	Change 12-months – 24 months
CM mean ± SD 95%-CI	(11 patients) 1.52 ± 1.23* (0.70; 2.25)	(11 patients) 1.50 ± 1.14** (0.73; 2.67)	(11 patients) -0.02 ± 0.48*** (-0.35; 0.30)
FGG mean ± SD 95%-CI	(14 patients) 4.22 ± 1.78* (3.19; 5.25)	(14 patients) 4.04 ± 1.65** (3.09; 4.99)	(14 patients) -1.18 ± 0.32*** (-0.36; 0.004)
Implant-level
CM mean ± SD 95%-CI	(17 implants) 1.53 ± 1.47^§ (0.77; 2.29)	(17 implants) 1.21 ± 1.61^§§ (0.38; 2.03)	(17 implants) -0.32 ± 1.13^$$ (-0.90; 0.26)
FGG mean ± SD 95%-CI	(26 implants) 3.98 ± 1.84^§ (3.24; 4.72)	(26 implants) 3.79 ± 1.61^§§ (3.14; 4.44)	(26 implants) -0.19 ± 0.49^$$ (-1.39; 0.006)

Patient-level

Change
Baseline − 12 months

Change
Baseline − 24 months

Change
12-months – 24 months

mean ± SD

95%-CI

(11 patients)

1.52 ± 1.23*

(0.70; 2.25)

(11 patients)

1.50 ± 1.14**

(0.73; 2.67)

(11 patients)

-0.02 ± 0.48***

(-0.35; 0.30)

FGG

mean ± SD

95%-CI

(14 patients)

4.22 ± 1.78*

(3.19; 5.25)

(14 patients)

4.04 ± 1.65**

(3.09; 4.99)

(14 patients)

-1.18 ± 0.32***

(-0.36; 0.004)

Implant-level

mean ± SD

95%-CI

(17 implants)

1.53 ± 1.47^§

(0.77; 2.29)

(17 implants)

1.21 ± 1.61^§§

(0.38; 2.03)

(17 implants)

-0.32 ± 1.13^$$

(-0.90; 0.26)

FGG

mean ± SD

95%-CI

(26 implants)

3.98 ± 1.84^§

(3.24; 4.72)

(26 implants)

3.79 ± 1.61^§§

(3.14; 4.44)

(26 implants)

-0.19 ± 0.49^$$

(-1.39; 0.006)

CM – collagen matrix group, FGG – free gingival graft group, SD – standard deviation. S0 – intraoral scan taken at after 1 month, S1 - intraoral scan taken at after 12 months, S2 - intraoral scan taken at after 24 months

Between group comparison patient-level: Wilcoxon-Mann-Whitney-U test: * p < 0.001; ** p < 0.001; *** p = 0.274