Ladies and gentlemen,
a new tool to fill gaps in triangle mesh models, especially in models obtained from scan data, is available: Triangle Mesh Completer by Alexander Emeljanov. 3D tools - Rhinoceros plug-in & standalone program.
Currently it is released as a plug-in for Rhino 4.0 ( Modeling tools for designers ) and as a standalone utility as well. The last one is intended to use with a proper mesh viewer / editor that supports the .OFF file format (for example: freely distributed MeshLab: MeshLab | Download MeshLab software for free at SourceForge.net ). If you have any questions concerning this tool, please feel free to ask.
Regards,
Alexander