and covers having perimetric depressions for fitting the covers to said prism boxes, such that when said covers are removed it is possible to reach through said prism boxes for fixing {HEAD ~ the edges} of {TAIL ~ the orthodontic models} positioned between said prism boxes 
of
and covers having perimetric depressions for fitting the covers to said prism boxes , such that when said covers are removed it is possible to reach through said prism boxes for fixing { HEAD ~ the edges } of { TAIL ~ the orthodontic models } positioned between said prism boxes
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH