Journal of Dental Rehabilitation and Applied Science (구강회복응용과학지)

Korean Academy of Stomatognathic Function and Occlusion (대한턱관절교합학회)
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Evaluation of the dimensional change of 3D-printed complete denture after post-curing

후경화에 따른 3차원 프린팅 의치의 체적변화

  • Suyeon, Lee (Postgraduate School, College of Dentistry, Chosun University) ;
  • Younghun, Kwak (Postgraduate School, College of Dentistry, Chosun University) ;
  • Eunchul, Park (Postgraduate School, College of Dentistry, Chosun University) ;
  • Heejung, Kim (Department of Prosthodontics, College of Dentistry, Chosun University)
  • 이수연 (조선대학교 치의학전문대학원) ;
  • 곽영훈 (조선대학교 치의학전문대학원) ;
  • 박은철 (조선대학교 치의학전문대학원) ;
  • 김희중 (조선대학교 치과대학 치과보철학교실)
  • Received : 2022.12.13
  • Accepted : 2022.12.19
  • Published : 2022.12.31
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Abstract

Purpose: The purpose of this study was to assess the dimensional change of 3D-printed dentures after post-curing. Materials and Methods: The upper and lower dentures were designed in Exocad DentalCAD software and exported as STL files. The upper and lower dentures were printed from 10 STL files using a DLP-type dental 3D printer. The printed upper and lower dentures were cleaned, and a scan file was created using a model scanner before and after post-curing. The dimensional change was evaluated by superimposing the scanned denture files before and after post-curing and measuring the distance between measurement points on the denture. SPSS was used for statistics, and the level of significance was 5%. Results: The maxillary denture reduced in size during post-curing, with the most notable color change occurring in the posterior palatal region. The reduction in anteroposterior maxillary denture length (A-D, A-E, A-F), as well as the distance between the first molars on both sides (B-C), was statistically significant. After post-curing, the mandibular denture showed more noticeable color change in the posteriorly buccal and lingual region. The decrease of length on the posterior (A-M, A-D, A-E, A-L, A-H, A-I, H-I) and lingual (J-K, L-M) sides of the denture were statistically significant. Conclusion: There was significant dimensional change in both the length and width of the 3D-printed maxillary and mandibular dentures after post-curing in this experiment. Consequently, it is seemed necessary to develop post-curing techniques and materials that reduce such denture deformation.

목적: 이 연구목적은 3차원 프린팅의치의 후경화후로 인한 의치의 체적변화를 평가하고자하였다. 연구 재료 및 방법: 상·하악 의치를 Exocad DentalCaD 프로그램을 이용하여 디자인하였으며, STL 파일로 추출하였다. DLP 방식의 치과용 3차원 플린터를 이용하여 상·하악 의치 STL파일을 상·하악 각기 10개씩 출력하였다. 출력된 상·하악 의치는 세척하였고, 후경화를 시행하기전과 후에 각 각 모형스캐너를 이용하여 스캔파일을 만들었다. 후경화 전후의 스캔된 의치파일을 중첩하여 변화를 평가하였으며, 의치상의 계측점사이의 거리를 측정하였다. 통계는 SPSS를 이용하였으며, 유의수준은 5%였다. 결과: 상악의치는 후경화 후에 전반적으로 수축하였으며, 후구개부위에서 가장 뚜렷한 변화를 보였다. 상악의치 전후방 (A-D, A-E, A-F)의 길이와 양측제1대구치사이(B-C)의 길이 감소가 통계학적으로 유의성을 보였다. 하악의치는 후경화 후에 전후방의 길이변화보다는 폭경의 변화가 비교적 뚜렷하였는데, 의치후방(A-M, A-D, A-E, A-L, A-H, A-I, H-I)과 설측(J-K, L-M)에서 통계학적으로 유의성있는 길이변화가 관찰되었다. 결론: 이 실험의 결과내에서, 3차원 프린터로 출력되는 상·하악 의치는 후경화 후에 길이와 폭이 모두 변화하였다. 결론적으로, 의치의 변형을 최소화할 수 있는 후경화 방법과 재료의 개발이 필요할 것으로 사료된다.

Keywords

Acknowledgement

이 논문은 2020년도 조선대학교 치과병원 학술연구비의 지원을 받아 연구되었음.

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