/usr/share/sofa/examples/Demos/Dentistry/data/ is in sofa-data 1.0~beta4-11.
This file is owned by root:root, with mode 0o755.
..
/usr/share/sofa/examples/Demos/Dentistry/data/mesh/
/usr/share/sofa/examples/Demos/Dentistry/data/mesh/dental_instrument.mtl
/usr/share/sofa/examples/Demos/Dentistry/data/mesh/dental_instrument.obj
/usr/share/sofa/examples/Demos/Dentistry/data/mesh/dental_instrument_centerline.obj
/usr/share/sofa/examples/Demos/Dentistry/data/mesh/skull_and_teeth.mtl
/usr/share/sofa/examples/Demos/Dentistry/data/mesh/skull_and_teeth.obj
/usr/share/sofa/examples/Demos/Dentistry/data/mesh/skull_and_teeth_coarse.mtl
/usr/share/sofa/examples/Demos/Dentistry/data/mesh/skull_and_teeth_coarse.obj
/usr/share/sofa/examples/Demos/Dentistry/data/mesh/teeth.obj
/usr/share/sofa/examples/Demos/Dentistry/data/mesh/tooth-128.fmesh
/usr/share/sofa/examples/Demos/Dentistry/data/mesh/tooth-closed.obj
/usr/share/sofa/examples/Demos/Dentistry/data/mesh/tooth_coarse_mesh.mtl
/usr/share/sofa/examples/Demos/Dentistry/data/mesh/tooth_coarse_mesh.obj