关键词: 角化龈, 植体周软组织, 植体周硬组织

Abstract: The keratinized gingiva around the implant has a barrier effect against plaque stimulation and mechanical trauma，which is of great significance to the success of the final implant repair，both functionally and aesthetically. Early studies have shown that the keratinized gingiva of at least 2 mm（including at least 1mm attached gingival）can maintain periodontal health. The presence of keratinized gingiva around the implant is conducive to the control of plaque around the implant and later maintenance，but there is still controversy about the relationship between the exact amount of keratinized gingiva and the infection around the implant. This review summarizes the researches of keratinized gingiva around implants，which may provide a guideline for the soft tissue surgery around implants.

Key words: keratinized gingiva, peri-implant soft tissue, peri-implant hard tissue