{HEAD ~ A scanner} is described which acquires {TAIL ~ images} of the dentition which are converted to three dimensional frames of data 
acquires
{ HEAD ~ A scanner } is described which acquires { TAIL ~ images } of the dentition which are converted to three dimensional frames of data
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH