resins is placed at the object inlet 11 of the apparatus and the conveyor 2 is driven by the action of the conveyor 2 the object 10 is continuously moved below the halogen lamps 1 irradiating visible light under the controlled ambient temperature and reaches soon the object outlet 12 terminating the hardening process in case a large number of the objects are to be hardened by this apparatus the objects may be introduced into the apparatus from the object inlet 11 one after another according to the moving speed of the conveyor 2 as the result the hardened objects continuously come out of the object outlet 12 after undergoing the same exposure of the visible light and the heating next description will be given on the case where orthodontic brackets are hardened and molded using the visible light curing resins by the apparatus of this invention into a light transmission type mold made of poly 4 methyl 1 pentene for the molding of bracket the visible light curing resins were injected which was composed of 52 weight parts of bisphenol a ethyleneglycol modified dimethacrylate 39 weight parts of methyl methacrylate 9 weight parts of aerosol silica with hydrophobic treatment nippon aerosil co r 972 0 7 weight part of camphorquinone and 0 7 weight part of dibenzoyl peroxide then.