Improved procedure for the preparation of borders of elements in wood particles, particularly for the formation of small doors, and panels so obtained, characterized by the fact of:being firstly milled lengthwise in correspondence to at least one of the four external sides, said milling consisting of a groove that concerns only the intermediate zone formed by an agglomeration of large chip particles:being spread with glue in the interior of said sites so obtained;finally, proceeding with the insertion inside the site of an insert of wood, pseudo wood or plastic material, conforming to the same section:then the said panel so obtained could be subjected to a finishing cycle essentially including, firstly the shaping of the borders concerned and lastly conveniently covering with melamine paper, PVC, laminates and derivatives.