The purpose of this study was to clarify the relationship between crevicular fluid volume in the osseointegrated implant sulcus and peri-implant condition. Crevicular fluid volume was measured in 63 osseointegrated implant sulci, and Gingival Index, Plaque Index, and probing depth were evaluated around the implants. The crevicular fluid volume in the sulci of osseointegrated implants with high Gingival Indexes was greater than that in those with low Gingival Indexes. The crevicular fluid volume in the sulci of the implants with high Plaque Indexes was greater than that in those with low Plaque Indexes. Keywords: crevicular fluid, Gingival Index, osseointegrated implant, Plaque Index, probing depth