A Forest of Nanotubes (IMAGE) Michigan Technological University Caption This shows a forest of titanium dioxide nanotubes etched into metallic titanium. The surface holds promise for improving the longevity of dental implants. Credit Tolou Shokuhfar Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.