Surface chemistry seems to affect peri-implant bone healing, increasing bone-to-implant contact and biological andmechanical properties. The present study aim to assess the radiographic bone density around implants with different surface treatment, comparing a surface treated by laser ablation followed by hydroxyapatite coating with a surface that was oxide-blasted followed by acid etching. On this study twenty-four rabbits received two implants in each tibia, an oxide-blasted + acid-etched (ATS) and a hydroxyapatite-coated (HAP) implant. Radiographs of the implants were recorded after 4, 8, and 12 weeks of healing (8 animals in each healing period), and bone density was assessed in regions of interest (ROI) in cortical and cancellous bone adjacent to the implant using the shade of grey in the bone ROIs compared to a reference ROI in each image (a ratio was calculated: bone ROI/reference ROI). The data analysis indicated that the difference between the density ratios obtained for both HAP and ATS implants were statistically nonsignificant in all healing periods. In the ATS group, the ratio increased fromweek 4 to week 8 and then decreased from week 8 to week 12, in both cortical and cancellous bone. The HAP group showed an increase in the ratio from week 4 to week 12 in cancellous bone while in cortical bone no variation throughout the healing periods was seen. Based on the results, the HAP-coated implant surface was not able to significantly increase the radiographic bone density around implants compared to conventional ATS implants.
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Meeting of the American Academy of Osseointegration, 2012