International Journal of Implant Dentistry

Table 2 Thickness changes between analyzed time intervals over a 6-month follow-up period

From: Three-dimensional changes of a porcine collagen matrix and free gingival grafts for soft tissue augmentation to increase the width of keratinized tissue around dental implants: a randomized controlled clinical study

Patient-level	CM			FGG
Patient-level	S0–S1* (13 patients)	S0–S2** (14 patients)	S1–S2*** (14 patients)	S0–S1* (14 patients)	S0–S2** (15 patients)	S1–S2*** (16 patients)
Mean ± SD	− 0.14 ± 0.27	− 0.04 ± 0.40	− 0.03 ± 0.22	− 0.08 ± 0.29	− 0.13 ± 0.23	− 0.06 ± 0.14
95% CI	− 0.31;0.02	− 0.26; 0.18	− 0.15;0.10	− 0.24;0.09;	− 0.25;0.004	− 0.13; 0.02

Implant-level	S0–S1^§ (21 implant)	S0–S2³³ (22 implants)	S1–S2³³³ (22 implants)	S0–S1³ (26 implants)	S0–S2³³ (28 implants)	S1–S2³³³ (29 implants)
Mean ± SD	− 0.16 ± 0.27	− 0.03 ± 0.40	− 0.05 ± 0.24	− 0.005 ± 0.30	− 0.07 ± 0.26	− 0.05 ± 0.14
95% CI	− 0.28;0.04;	− 0.21;0.14	− 0.16;0.06	− 0.13;0.12;	− 0.18;0.03	− 0.104;0.001

Between group comparison—patient level: unpaired t-test: *p = 0.542; **p = 0.467; ***p = 0.659
Implant level: multivariate linear regression with mixed effect models: ³p = 0.778; ³³p = 0.016; ³³³p = 0.045

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