Abstract: The method for manufacturing a three-dimensional object or for modifying the surface state of a preformed object by local polymerisation of monomers or oligomers, the polymerisation being initiated by mono-photon or multi-photon absorption in an area to be polymerised, includes: —introducing into a vessel with light-transparent walls a reaction medium comprising polymerisable monomers or oligomers, a polymerisation inhibitor, an indicator of the amount of the inhibitor and a photochemical polymerisation initiator; —initiating the polymerisation of the monomers or oligomers; —indicating the amount of inhibitor present in the reaction medium; —controlling the amount of light emitted by the irradiation system relative to the amount of inhibitor indicated by the indicator; and —switching to a following zone to be polymerised by moving the object and/or the focused light beam.

Abstract: The present invention relates to a method for producing a three-dimensional object comprising the following operations: a. introducing a composition (11) into a polymerization vessel (9), b. polymerizing the composition (11) by multiphoton photopolymerization, at predetermined locations, in order to produce the three-dimensional object (3), the composition (11) comprising at least one monomer, at least one filler and at least one photoinitiator, —characterized in that: the difference between the refractive indices of the monomer and of the filler present is less than 0.05; —the viscosity of the composition (11) is greater than or equal to 0.05 Pa·s; —the composition (11) is transparent to the photopolymerization wavelength.

Abstract: A method for producing a three-dimensional object comprises the following operations: introducing a composition into a polymerization vessel; and polymerizing the composition by multiphoton polymerization, by means of a light source, in predetermined spots, in order to produce the three-dimensional object, the composition comprising at least one monomer, at least one filler and at least one photoinitiator, the composition having a transmittance per unit of length to the emission wavelengths of the light source, which is preferably higher than 75% and the at least one filler comprises nanoparticles.