This study aims to conduct a cross-sectional study to compare the differences in clinical indices, patient-reported outcomes, and levels of inflammatory factors in peri-implant gingival crevicular fluid between sites with adequate (≥ 2 mm) and inadequate (\< 2 mm) keratinized mucosa after implant restoration, in order to explore the impact of the presence of keratinized mucosa on peri-implant soft and hard tissue health.
Individuals aged 18 to 70 years (inclusive of 18 and 70 years), of any gender;
Patients who have undergone dental implant restoration是（single crown or fixed bridge restorations） at the Stomatology Hospital, Zhejiang University School of medicine and have had their final restoration for at least 6 months;
Patients who voluntarily participate and sign the informed consent form after being fully informed, and who cooperate with relevant examinations.
Patients who are unwilling to participate in the follow-up of this study for various reasons
Patients who have completed dental implant restoration（single crown or fixed bridge restorations） for at least 6 months and undergo routine follow-up examinations.
Case-control
Cross-sectional
No intervention
Other interventionNo intervention: observational case-control study
Width of Keratinized Mucosa, KMW
Plaque Index(PI)
Bleeding on Probing(BOP)
Peri-implant Probing Depth(PPD)
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