| abstract |
The present invention provides a radiation curable composition comprising at least one radiation hardenable component, a photoinitiator, and a filler material comprising, by weight of the printable composition, greater than or equal to 50% of the particle population. The particle population exhibits a median diameter (D50) of greater than or equal to 0.3 microns on a volume average basis as determined using the Particle Size Test Method, and the radiation curable composition exhibits less than or equal to 150 Pa when measured using the Viscosity Test Method ยท s viscosity. The present invention also describes forming a hardened layer by selectively subjecting a portion of the radiation curable composition to an actinic radiation source to at least partially cure the treated portion of the radiation curable composition, preferably Methods, apparatus and systems for producing composite articles by additive manufacturing methods such as stereolithography. The composite article may comprise a composite dental restoration. |