Liquid radiation curable resin compositions for additive manufacturing comprising: from about 5 to about 30 wt % of an oxetane； a (meth)acrylate component； a cationic photoinitiator； a free-radical photoinitiator； and from about 50 to about 80 wt % of an epoxy, which further comprises a cycloaliphatic epoxy component, and an epoxy component having an aromatic glycidyl ether group, wherein the majority of the epoxy is the cycloaliphatic epoxy component are described and claimed. Also described and claimed is a process for using the liquid radiation curable resins for additive manufacturing to create molds for dental aligners, and the three-dimensional molds made from the liquid radiation curable resins for additive manufacturing.
