Aims: To evaluate the osseointegration potential of surface-treated mini-implants retrieved from patients by examining bone-to-implant contact (BIC). Material and Methods: Five implants from four patients were inspected. The average patient age was 38.1 years, and the average treatment duration 11.4 months. The mini-implants were removed with a trephine bur under saline irrigation. After histologic preparation, the BIC was measured. Results: Under 3003 magnification, an active adherence of bone cells to the treated surface was seen. The mean BIC was 52.6%. Conclusion: This pilot study confirms the osseointegration potential of a surface-treated mini-implant. World J Orthod 2009;10:202–210.