PROBLEM TO BE SOLVED: To provide a manufacturing method of a dental mill blank, capable of suppressing a mill blank part of the dental mill blank from being detached from a support part, and industrially advantageous.SOLUTION: A casting mold has a housing space for housing a molded body (A), and an attached space communicated with the housing space. A composition (B) containing a polymerizable monomer is introduced to the housing space and the attached space, the composition is impregnated into the molded body (A) of an inorganic filling material in the housing space, and the composition is held in a state of substantially containing no inorganic filling material in the attached space. A mill blank part 151 containing the inorganic filling material and a polymer having a polymerizable monomer unit, and a support part 152 projecting from the mill blank part, and substantially containing no inorganic filling material and containing a polymer are integrally formed by polymerizing the polymerizable monomer contained in the composition (B) introduced to the housing space and the attached space.SELECTED DRAWING: Figure 3CCOPYRIGHT: (C)2017,JPO&INPIT【課題】歯科用ミルブランクのミルブランク部が支持部から脱離することを抑制でき、工業的に有利な歯科用ミルブランクの製造方法を提供する。【解決手段】鋳型は、成形体(A)を収容する収容空間と、収容空間に連通する付属空間とを有している。重合性単量体を含む組成物(B)を収容空間及び付属空間に導入して、収容空間において組成物を無機充填材の成形体(A)に含浸させると共に、付属空間において組成物を無機充填材が実質的に含まれない状態に保持する。収容空間及び付属空間に導入された組成物(B)に含まれる重合性単量体を重合させて、無機充填材と重合性単量体単位を有する重合体とを含むミルブランク部151と、ミルブランク部から突出し、かつ無機充填材を実質的に含まず重合体を含む支持部152とを一体として形成する。【選択図】図3C
