The instrument comprises an elongate handle (10), having a distal end bearing a blade (20) having a scraper face (21) and an external scraping edge (22), projecting transversally externally with respect to the distal end, and a collecting compartment (30) of the scraped material. The collecting compartment (30) has a tubular shape and comprises a collecting chamber (31) having a constant transversal section and a distal end (32) which has a mouth (34) communicating with outside. The collecting compartment (30) is constrained to the handle (10), and is able to assume two different operating configurations: a first operating configuration in which the compartment (30) directly rests against an internal face (13) of the handle (10), with the distal end (32) thereof located adhering to the distal end (11) of the handle and facing the scraping face (21) of the blade, in proximity of the scraping edge (22), so as to receive the scraped material in inlet, and a second operating configuration in which the compartment (30) is located at a distance from the distal end (11) of the handle and a mouth (34) thereof is located distant from the blade (20) and from the handle (10). Lastly, a piston (50) is associated to the collecting compartment (30) having a rod (51 ) which slides along the chamber (30) of the compartment and an activating plunger (52) which projects from the chamber at the proximal end of the compartment.Linvention concerne un instrument qui comprend un manche allongé (10), ayant une extrémité distale portant une lame (20) ayant une face de raclage (21) et un bord de raclage externe (22), faisant saillie transversalement vers lextérieur par rapport à lextrémité distale, et un compartiment de collecte (30) de la matière raclée. Le compartiment de collecte (30) a une forme tubulaire et comprend une chambre de collecte (31) ayant une section transversale constante et une extrémité distale (32) qui a un embout (34) communiquant avec lextérieur. Le compartiment de col
