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치과용 재료의 적층가공에 대한 문헌고찰

Review on additive manufacturing of dental materials

강현구|고경호|허윤혁|박찬진|조리라|원선
대한턱관절교합학회 (Korean academy of stomatognathic function and occlusion)|2021.03|구강회복응용과학지 (Journal of Dental Rehabilitation and Applied Science)|제37권 제1호|pp. 1-15|DOI https://doi.org/10.14368/jdras.2021.37.1.1

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ceramicmechanical properties물성세라믹적층가공additive manufacturing폴리머금속polymermetal
주제분류치의학

초록

치과용 재료의 적층가공제작은 기존 제작방식에 비해 복잡한 형태까지 제작할 수 있으며 절삭가공에 비해서도 기구나재료의 소모가 적어 지속가능성이 장점으로 대두되고 있다. 적층가공 제작은 7가지 방식으로 분류할 수 있는데, 폴리머는 적층가공에 가장 적합한 재료로 용기중합방식으로 제작하며 기존 자가중합방식에 비해 높은 물성과 적합도를 가져상용화에 더 적합하지만 상대적으로 낮은 강도로 인해 임시수복물로 주로 이용된다. 금속은 PBF (powder bed fusion) 방식을 주로 이용하며 주조방식에 비해 파괴인성과 밀도가 높지만 잔류응력이 높아 이를 제거하기 위한 후처리방식에대한 연구가 필요하다. 세라믹은 분말과 레진폴리머를 혼합한 재료를 용기중합하는 방식이 일반적이다. 제작 후 폴리머제거나 소결과 같은 후처리 과정이 복잡하다. 상용화되려면 세라믹 적층가공에 의한 결과물의 낮은 강도와 체적정확성이 개선되어야 한다. 적층가공은 어떤 재료이건 공정조건에 따라 물성과 표면환경이 달라지므로 가장 적합한 공정조건을 찾기 위한 연구가 더 많이 필요하다고 사료된다.

Abstract

Additive manufacturing (AM) for dental materials can produce more complex forms than conventional manufacturing methods. Compared to milling processing, AM consumes less equipment and materials, making sustainability an advantage. AM can be categorized into 7 types. Polymers made by vat polymerization are the most suitable material for AM due to superior mechanical properties and internal fit compared to conventional self-polymerizing methods. However, polymers are mainly used as provisional restoration due to their relatively low mechanical strength. Metal AM uses powder bed fusion methods and has higher fracture toughness and density than castings, but has higher residual stress, which requires research on post-processing methods to remove them. AM for ceramic use vat polymerization of materials mixed with ceramic powder and resin polymer. The ceramic materials for AM needs complex post-processing such as debinding of polymer and sintering. The low mechanical strength and volumetric accuracy of the products made by AM must be improved to be commercialized. AM requires more research to find the most suitable fabrication process conditions, as the mechanical properties and surface of any material will vary depending on the processing condition. (J Dent Rehabil Appl Sci 2021;37(1):1-15)

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