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In this paper, the overall system accuracy of the navigation system RoboDent® is determined for the application in oral implant surgery. The measurements are performed by drilling in five models of the human jaw. The experimental test bed includes all steps of the intervention including image acquisition, registration, planning, instrument calibration and drilling. The results show that the new methods for registration and visualization that are implemented in the system increase the accuracy of navigation systems making the system capable of improving the treatment quality in oral implant surgery.