Fixing device (300B) for interacting with a dental apparatus with a polymeric housing (420), said fixing device (300B) comprising: an anchoring fixing body (350)； a joint surface (310) coupled to said anchor fixing body (350), said joint surface (310) being configured to fix said anchor fixing body (350) to a dental element (435)； an active force application mechanism (330) coupled to said anchor fixing body (350)； and a contact area of the polymeric shell dental apparatus (365) coupled to said active force application mechanism (330), said contact zone of the polymeric shell dental apparatus (340) being configured to make contact with said dental apparatus of polymeric housing (420) and applying a force generated by said active force-applying mechanism (330) between said dental element (435) and said dental polymeric housing apparatus (420) when said polymeric dental dental apparatus (420) is coupled to said active force application mechanism (330)； characterized in that the fixing device (300B) comprises two force application mechanisms (360, 370) coupled to the anchor fixing body (350), the fixing device (300B) being configured to generate forces through of the two force application mechanisms (360, 370) that are applied in different directions.Dispositivo de fijación (300B) para interactuar con un aparato dental de carcasa polimérica (420), comprendiendo dicho dispositivo de fijación (300B): un cuerpo de fijación de anclaje (350)； una superficie de unión (310) acoplada a dicho cuerpo de fijación de anclaje (350), estando configurada dicha superficie de unión (310) para fijar dicho cuerpo de fijación de anclaje (350) a un elemento dental (435)； un mecanismo activo de aplicación de fuerza (330) acoplado a dicho cuerpo de fijación de anclaje (350)； y una zona de contacto del aparato dental de carcasa polimérica (365) acoplada a dicho mecanismo activo de aplicación de fuerza (330), estando configurada dicha zona de contacto del aparato dental de carcasa polimérica (
