Biological complications related to bacterial engraftment on rough titanium are an issue in design of new functionalized implants. By fine-tuning femtosecond lasers (FSL) parameters, we aim to design multiscale (micro- + nano-scale) textured surfaces maintaining osteo-integration with unique antibacterial properties. Titanium samples (Ti6-Al4V) are irradiated at 1030-515-257 nm wavelengths to produce various types of Laser-Induced Periodic Surface Structures (LIPSS). We revealed that LIPSS periodicity and morphology (linear or radial) are determinant for anti-bacterial properties. Preliminary results on multiscale surfaces reveal that cell adhesion of bone stem cells is maintained. FSL appears then as an innovative tool to produce dual-functionalized surfaces.

Optical coherence tomography (OCT) is a non-invasive, radiation-free optical technique for caries diagnosis. The presented study dealt with the correlation of conventional caries detection methods and using polarisation-sensitive OCT (PS-OCT). Human extracted carious teeth were assessed by dentists with visual and radiographic examination and PS-OCT images were gained. Proximal lesions could be detected early in the intensity-based OCT cross-sectional images. The degree of polarization can clearly delineate proximal caries from surrounding healthy tooth structure. The obtained results pave the way to reduce invasive filling therapy through early possibilities of intervention.