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To evaluate the dimensional changes of the keratinized tissue width (KTW) in molar regions after augmentation by free gingival grafts (FGG) before implant placement. In seventeen patients, twenty implant sites in molar regions with KTW ≤3mm at the buccal aspect received FGG 2months before implant placement. KTW at the buccal aspect was measured before FGG (T, immediately before implant placement (T1), at the time of impression taking for final prosthesis fabrication (T2), and at the end of the follow-up period after loading (T3, 12-4