3D 프린팅 및 밀링 방법으로 제작된 임시 보철물 적합도 비교 분석
Marginal and internal fit of interim crowns fabricated with 3D printing and milling method
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목적: 본 연구의 목적은 서로 다른 제작 방법인 절삭 가공과 적층 가공 기술로 제작된 임시 보철물의 변연 및 내면 적합도를 평가하는 것이다. 연구 재료 및 방법: 상악 우측 제1대구치를 도재 수복을 위한 지대치 모형으로 준비하였다. 석고를 이용하여 총 40개의 실험 모형으로 복제하였고, 각각의 실험 모형을 구강 스캐너를 사용하여 스캔 데이터를 획득하였다. 3종의 3D 프린터 (Meg-printer 2; Megagen, Zenith U; Dentis 그리고 Zenith D; Dentis) 및 1종의 밀링 장비(imes-icore 450i; imes-icore GmbH)를 사용하여 각 그룹당 10개의 임시 보철물을 제작하였다. 임시 보철물의 내면에 실리콘을 채우고 모형에 적합하여 중합이 완료된 후, 실리콘으로 내면이 복제되어 있는 실험 모형을 구강 스캐너를 사용하여 스캔 데이터를 획득하였다. 3차원 검사 소프트웨어(Geomagic control X; 3D Systems)를 이용하여 변연 간격, 절대 변연 간격, 섐퍼, 축벽, 교두, 교합 영역의 적합도를 분석하였다. 통계 분석은 제작 방법의 차이를 비교하기 위해서 Kruskal-Wallis test를 사용하여 검증하였으며, 사후 검정을 위해서 Mann-Whitney U-test and Bonferroni correction method을 사용하였다(α = 0.05). 결과: 3종의 3D 프린터와 1종의 밀링 장비에서 제작된 임시 보철물의 절대 변연 간격은 유의한 차이를 보이지 않았다(P = 0.812). 축벽, 교합 간격에서 밀링 장비와 3D 프린터 사이에 유의한 차이를 보였다(P < 0.001). 결론: 3종의 3D 프린터로 제작된 임시 보철물의 변연 적합도는 모두 임상적 허용 범위(< 120 µm)에 있었으므로, 적합도 측면에서 본다면 임시 보철물 제작을 위해서 충분히 사용될 수 있다. (구강회복응용과학지 2020;36(4):254-61)
Abstract
Purpose: The purpose of this study was to assess the marginal and internal fit of interim crowns fabricated by two different manufacturing method (subtractive manufacturing technology and additive manufacturing technology). Materials and Methods: Forty study models were fabricated with plasters by making an impression of a master model of the maxillary right first molar for ceramic crown. On each study model, interim crowns (n = 40) were fabricated using three types of 3D printers (Meg-printer 2; Megagen, Zenith U; Dentis, and Zenith D; Dentis) and one type milling machine (imes-icore 450i; imes-icore GmbH). The internal of the interim crowns were filled with silicon and fitted to the study model. Internal scan data was obtained using an intraoral scanner. The fit of interim crowns were evaluated in the margin, absolute margin, axial, cusp, and occlusal area by using the superimposition of 3D scan data (Geomagic control X; 3D Systems). The Kruskal-wallis test, Mann-Whitney U test and Bonferroni correction method were used to compare the results among groups (α = 0.05). Results: There was no significant difference in the absolute marginal discrepancy of the temporary crown manufactured by three 3D printers and one milling machine (P = 0.812). There was a significant difference between the milling machine and the 3D printer in the axial and occlusal area (P < 0.001). The temporary crown with the milling machine showed smaller axial gap and higher occlusal gap than 3D printer. Conclusion: Since the marginal fit of the temporary crown produced by three types of 3D printers were all with in clinically acceptable range (< 120 µm), it can be sufficiently used for the fabrication of the temporary crown. (J Dent Rehabil Appl Sci 2020;36(4):254-61)
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