DEVICE FOR MAKING, DUPLICATING AND FIXING DENTAL MODELS IN ARTICULATOR, in the field of dentistry, comprising a dental articulator to be used with dental replicas made of plaster or other material, upper and lower, adjusted to accurately reproduce the patient's bite, allowing the creation and use of a pair of articulated and related dental models in said existing articulator by adding some bases and pins to said dental replicas , in that the pins have fixing means to said bases and by platens that have protruding from their surface, arranged in position to join said pins and make a separable connection with them, keeping said elements of each arm of said articulator , wherein - it comprises at least three of said pins and a minimum of three fixing elements , said pins have a protrusion or lower cavity for centering in the body of said fixing element that respectively has a cavity and/or antagonistic protrusion; - it comprises a tray , made of relatively elastic material, such as rubber, configured for emptying or pouring plaster or material to make a mold for duplicates, which is a container in the bottom of which there are one or more holes , said fixing elements fitting in said holes and in which said pins can be placed fixed by said fixing elements thereby plugging said holes ; - said articulator further comprises having in its arms base surfaces aimed at receiving said platens , also having stops to the maximum closure of the articulator, in which said arms are arranged in a position parallel to each other thus maintaining a separation or height (h) or "master" predefined between the end surfaces of said fixing elements of said platens ; - it further comprises a double positioner formed by a hollow body inside which said dental replicas are arranged and adjusted to the patient's bite; - it further comprises a platen positioner that has two extreme parallel surfaces, formed by planes in the shape of a geometric figure with a minimum of three vertices, there being In each of said vertices of both end surfaces a fixing and/or positioning element compatible with said fixing elements ; - it keeps said detachable connection a pre-established and reproducible relationship. - it comprises at least three of said pins and a minimum of three fixing elements , said pins have a protrusion or lower cavity for centering in the body of said fixing element that respectively has a cavity and/or antagonistic protrusion; - it comprises a tray , made of relatively elastic material, such as rubber, configured for emptying or pouring plaster or material to make a mold for duplicates, which is a container in the bottom of which there are one or more holes , said fixing elements fitting in said holes and in which said pins can be placed fixed by said fixing elements thereby plugging said holes ; - said articulator further comprises having in its arms base surfaces aimed at receiving said platens , also having stops to the maximum closure of the articulator, in which said arms are arranged in a position parallel to each other thus maintaining a separation or height (h) or "master" predefined between the end surfaces of said fixing elements of said platens ; - it further comprises a double positioner formed by a hollow body inside which said dental replicas are arranged and adjusted to the patient's bite; - it further comprises a platen positioner that has two extreme parallel surfaces, formed by planes in the shape of a geometric figure with a minimum of three vertices, there being In each of said vertices of both end surfaces a fixing and/or positioning element compatible with said fixing elements ; - it keeps said detachable connection a pre-established and reproducible relationship. <EOS>