Comparison of Removal Torques for Implants With Hydroxyapatite-Blasted and Sandblasted and Acid-Etched Surfaces

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Purpose:Sandblasted and acid-etched (SLA) implants are widely known and used by many practitioners. A resorbable blasting media (RBM) surface is produced by blasting with bioceramic particles. We studied the correlation between the particle sizes of the media and the biomechanical force, evaluating the removal torque of hydroxyapatite-blasted implants.Materials and Methods:Commercial SLA implants comprised the control group, and RBM surface–treated implants of the same size and design comprised the experimental group. These implants were installed on both sides of rabbits' tibiae. Four weeks after the implants were installed, the implant removal torque was measured using a digital torque device. The roughness of the implant surface was analyzed using field-emission scanning electron microscopy and confocal laser scanning microscopy.Results:Both groups of surface textures exhibited a regular porosity. The 2 groups exhibited different surface roughness. No significant differences in removal torques were observed between the control and experimental groups.Conclusion:There were no significant differences in our measures of osseointegration between hydroxyapatite-blasted and SLA implants.

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