Mucosa flap was moved towards the vestibular groove and sutured to the periosteum with absorbable suture so that the free end of keratinized gingiva was apically positioned beneath adjacent normal mucogingival junction. 将粘膜瓣向前庭沟方向滑行,使游离端角化牙龈根向复位至邻牙正常膜龈联合根方,并用可吸收线将其缝合于骨膜固定,然后缝合近远中附加切口。