{HEAD ~ The virtual model} of the desired occlusion and the virtual model of the original dentition provide {TAIL ~ a base} of information for custom manufacture of an orthodontic appliance 
provide
{ HEAD ~ The virtual model } of the desired occlusion and the virtual model of the original dentition provide { TAIL ~ a base } of information for custom manufacture of an orthodontic appliance
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH