The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
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Accuracy of CAD-CAM RPD framework according to manufacturing method: A literature review

국소의치 구조물(framework)의 CAD-CAM 제조방식에 따른 정확도: 문헌고찰

  • Yi, Yuseung (Department of Prosthodontics, Seoul National University Dental Hospital)
  • 이유승 (서울대학교치과병원 치과보철과)
  • Received : 2021.03.16
  • Accepted : 2021.06.21
  • Published : 2021.07.31
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Abstract

Purpose. The purpose of this study was to evaluate the currently published literatures investigating the accuracy of computer-aided design and computer-aided manufacturing removable partial denture (CAD-CAM RPD) framework with different manufacturing techniques and methods. Materials and methods. A comprehensive search for literatures was conducted in PubMed database using specific keywords with the patient, intervention, comparison, and outcome (PICO) question, "Is there a difference in accuracy of RPD frameworks manufactured using digital workflow according to the manufacturing process and methods?" Results. A total of 7 articles were selected. Two studies compared intraoral scanning and laboratory scanning for RPD frameworks and had heterogenous results. In the studies using different manufacturing process, RPD frameworks had clinically acceptable accuracy in both subtractive and additive manufacturing. Polyetheretherketone (PEEK)-milled RPD frameworks showed higher fit accuracy than traditionally casted or 3D printed RPDs. Direct milling method showed a higher accuracy than indirect milling method. However, in rapid prototyping, indirect method showed higher accuracy than direct method. Conclusion. The RPD frameworks fabricated using CAD-CAM technology showed a clinically acceptable level of accuracy regardless of manufacturing process or techniques. Consistent results have not been reported regarding the digital impression methods, which were intra oral scanning or laboratory scanning, and further studies are needed.

목적: 본 연구의 목적은 CAD-CAM 방식으로 제작한 RPD framework의 제조 과정 및 제작 방법에 따른 적합도를 문헌 고찰을 통해 평가하는 것이다. 재료 및 방법: 다음의 PICO (patient, intervention, comparison, and outcome) 질문과 관련한 특정 키워드를 이용하여 PubMed 데이터베이스 상에서 포괄적인 문헌 검색을 시행하였다: "제조 과정 및 제작 방식에 따라 디지털 RPD framework의 정확도에 차이가 있는가?" 결과: 총 7개의 문헌이 선택되었으며, 이 중 두 문헌에서 구강스캔과 모형스캔을 이용한 디지털 RPD framework의 정확도에 관하여 비교하였으나, 일관된 결과를 얻지 못하였다. 제작 방식에 따른 비교 문헌에서는 적층 가공 또는 절삭 가공을 통해 제작된 RPD framework 모두 임상적으로 허용가능한 수준의 정확도를 보였으며, PEEK (Polyetheretherketone) milling RPD framework가 전통적 주조방식으로 제작하거나 3D 프린팅으로 제작한 RPD framework보다 높은 적합도를 보였다. Milling RPD framework에서는 direct 방식으로 제작한 경우에 indirect 방식의 경우보다 우수한 적합도가 관찰되었으나, 3D 프린팅 RPD framework에서는 indirect 방식으로 제작한 경우에 더 높은 적합도를 보였다. 결론: CAD-CAM 기술을 이용하여 제작된 디지털 RPD framework는 제조 과정이나 방식에 관계없이 임상적으로 허용되는 수준의 정확도를 보였다. 구강스캔 또는 모형스캔의 디지털 인상 채득 방법에 따라서는 일관된 결과가 보고되지 않았으며, 추후 연구가 필요하다.

Keywords

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