**5. Conclusions**

Electrolytic cleaning of contaminated implants achieves an implant surface where complete re-osseointegration is possible. This was attained in 50% of the cases. Additional mechanical cleaning by the use of powder spray devices does not improve the results further. The amount of regeneration depends on the regenerative potential of the bone (multiwall craterlike defects perform better than horizontal bone loss). Further confounding factors could not be identified owing to the limited sample size of 24 patients.

**Author Contributions:** Conceptualization, M.S. and H.Z.; Data curation, M.S. and F.R.; Formal analysis, M.S., F.R., C.R. and H.Z.; Investigation, M.S. and F.R.; Methodology, M.S., U.B. and H.Z.; Project administration, M.S.; Resources, M.S.; Software, C.R.; Supervision, M.S.; Validation, M.S., F.R., C.R., P.W. and H.Z.; Visualization, M.S. and H.Z.; Writing—original draft, M.S. and H.Z.; Writing—review & editing, M.S., F.R., U.B., C.R., P.W. and H.Z.

**Acknowledgments:** The study was sponsored by GalvoSurge Dental AG; We appreciate Ümniye Balaban, Institute for Biostatistics and Mathematical Modeling Center of Health Sciences, Hospital and Department of Medicine of the Goethe University for her support with the statistics.

**Conflicts of Interest:** The authors Schlee, Zipprich and Brodbeck declare that they own shares in GalvoSurge Dental AG.
