Cleaning up scans Mark ii Scanner App, need help


What do you use to clean up holes from scans done on the scanner app? There is one above the bear in but MeshMixer will wont fill it in? Looking at the mesh too its not polygons just a bunch of lines?

Whats everbodys workflow, I just got my scanner and I want to scan everything but all the scans just need a little touch up and I have no idea how.

Thank you for any help!