1. Department of Pediatric Dentistry, Dental School-Hospital of Brest, France.
2. University of Bretagne Occidentale, Brest, France.
3. Ecole Nationale d'Ingénieurs de Brest, Brest, France.
4. Department of Endodontics and Restorative Dentistry, Dental School-Hospital of Brest, University of Bretagne Occidentale, Brest, France.
5. Laboratory of Medical Information Processing, Brest, France.