Patient-reported outcome measures and clinical outcomes following peri-implant vestibuloplasty with a free gingival graft versus xenogeneic collagen matrix: a comparative prospective clinical study

International Journal of Implant Dentistry

Table 6 Changes of KMW with time and other peri-implant parameters at 6-month follow-up

		XCM (n = 46)	FGG (n = 44)	p-value
KMW^a (mm)^b	Baseline	1.25 ± 0.53	1.07 ± 0.50	0.092
	Immediately after surgery	8.72 ± 3.56	7.01 ± 1.77	0. 005^*
	3 months after surgery	3.63 ± 1.79	4.22 ± 1.91	0.137
	6 months after surgery	2.82 ± 1.58	3.74 ± 1.76	0.010^*
Shrinkage rate of KMW at 6 months (%)^b		65 ± 21	47 ± 23	0.000^*
Gain of KMW at 6 months (mm)^b		1.57 ± 1.69	2.68 ± 1.80	0.003^*
mPLI^c		0 (0)	0 (0)	0.570
GI^c		0 (0)	0 (0)	0.506
PD^b		2.70 ± 0.71	2.66 ± 0.89	0.796
mBI^c		0 (0)	0 (0)	0.728

^aKeratinized mucosa width. ^bData are presented as mean ± standard deviation. Independent sample T tests were used to calculate significance levels (p-value). *Statistically significant difference between groups (p<0.05). ^cData are presented as median (interquartile range), and Mann-Whitney U tests were used to calculate significance levels (p-value)