One custom-made 2 x 10-mm site evaluation implant ( SEI ) with nanometer scale and oxidized surface ( test ) ( Evo Plan 1 Health s.r.l. - Amaro , UD , Italy ) , and one SEI with hydroxyapatite sandblasted surface ( control ) ( Osseogrip Plan 1 Health s.r.l. Amaro , UD , Italy ) , were placed in the posterior maxilla of 15 patients .
