A variable mechanical constraining guide system to be used for guiding surgical instruments during dental implantology procedures on dental arches (64), said system comprising : a) a template (65) to be positioned on a dental arch (64), said template comprising at least a first seat (66) for the introduction of a guide means associated with a second seat (67) for the passage of the guided surgical tools； b) a guide rail (60, 84) that can be associated with said seat (66) of said template (65) and comprising a guide groove (63) constituting a sliding seat for the tool guide means； wherein said guide means of the tool comprise a movable slide (68) comprising a portion (69) provided with a hole (91), that can be associated with a tool (72, 75, 90, 104) and an elongated portion (70) that can be connected to said guide rail (60) of said slide, and wherein said hole (91) and said elongated portion (70) of said movable slide (68) are arranged according to an axis which is parallel to the sliding axis of the guide groove (63) of said guide rail (60, 84) in turn parallel to the axis of the bone seat in which the tool is guided, the sliding seat or guide groove (63) of said guide rail (60) being configured to house different conformations of the elongated portion (70) of said movable slide (68), which are variable based on different work requirements.L'invention concerne un système de guidage mécanique à contrainte variable destiné à être utilisé pour guider des instruments chirurgicaux pendant des procédures d'implantologie dentaire sur des arcades dentaires (64), ledit système comprenant : a) un gabarit (65) à positionner sur une arcade dentaire (64), ledit gabarit comprenant au moins un premier siège (66) pour l'introduction d'un moyen de guidage associé à un deuxième siège (67) pour le passage des outils chirurgicaux guidés ； b) un rail de guidage (60, 84) qui peut être associé audit siège (66) dudit gabarit (65) et qui comprend une rainure de guidage (63) constituant un
