PURPOSE:The aim of this study was to evaluate the influence of oxidized surface on bone-to-implant contact percentage (BIC%) as well as the bone density within the threads area (BD%) in human bone after 2 months of unloaded healing. MATERIALS:Seven subjects (mean age 45.57 +/- 10.45 years) received 2 micro-implants each during conventional implant surgery in the posterior maxilla. The implants that presented turned and oxidized surfaces served as control and test, respectively. After the healing period, the implants and the surrounding tissue were removed and prepared for ground sectioning and analysis. RESULTS:Two turned implants were found to be clinically unstable at the time of retrieval. Histometric evaluation showed that the mean of BIC% was 17.40 +/- 14.16% and 32.19 +/- 15.68% to turned and oxidized surfaces, respectively. The BD% was 22.13 +/- 19.06% for turned surface and 50.40 +/- 18.35% for oxidized surface. CONCLUSION:The histologic data from this preliminary study suggest that the oxidized micro-implants surface presented better mean values of BIC% and BD% than turned micro-implants after a short healing time.