Device for the relative positioning of the upper and lower jaws of a subject

A device for the relative positioning of the lower and upper jaws of a subject, comprising lower and upper splints intended to be disposed on the dental arches of the lower and upper jaws of the subject and linked by link members disposed in an occlusal position, between the splints, each link member comprising posterior and anterior end parts, the posterior end part being longitudinally movable relative to an occlusal face of the upper splint, and the anterior end part being connected to the lower splint and longitudinally immovable over an occlusal face of the lower splint when connected to the lower splint, so as to stress said lower splint in a forward direction relative to the upper splint when the posterior end part is moved longitudinally relative to the occlusal face of the upper splint, wherein each link member is composed of a rigid link rod of fixed length whose posterior end part is on the upper splint and in that the position of the posterior end part of each rigid link rod is longitudinally adjustable in the occlusal plane so as to adjust the position of the lower splint, wherein said posterior end part comprises a head movably mounted in translation in a longitudinal guiding rail on the occlusal face of the upper splint, and wherein the lower splint comprises a recess that receives a protruding part of said guiding rail, and wherein said recess is formed in said occlusal face of said lower splint, and is of a form complementing that of said guiding rail.