Journal of Dental Rehabilitation and Applied Science (구강회복응용과학지)

Korean Academy of Stomatognathic Function and Occlusion (대한턱관절교합학회)
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Comparison of color stability of denture base resin fabricated by subtractive, additive manufacturing and heat-curing methods

절삭 및 적층 가공 방식과 열중합 방식으로 제작한 의치상 레진의 색안정성 비교

  • Min-Young Jo (Department of Prosthodontics, College of Dentistry, Wonkwang University) ;
  • Jin-Han Lee (Department of Prosthodontics, College of Dentistry, Wonkwang University)
  • 조민영 (원광대학교 치과대학 치과보철학교실) ;
  • 이진한 (원광대학교 치과대학 치과보철학교실)
  • Received : 2025.04.29
  • Accepted : 2025.05.08
  • Published : 2025.05.31
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Abstract

Purpose: This study aimed to compare the color stability of denture base resins manufactured using subtractive manufacturing (SM), additive manufacturing (AM), and heat-curing (HC) methods, with respect to both fabrication method and staining duration. Materials and Methods: Specimens were prepared according to each fabrication method and immersed in coffee solution and distilled water for 12, 24, and 36 days. Color changes (ΔE*) were measured using a spectrophotometer, and statistical analysis was performed with one-way ANOVA and repeated measures ANOVA. Results: The AM group showed significantly higher values than SM and HC groups at all evaluated intervals, whereas no significant differences were observed between SM and HC groups. All groups exhibited significant color changes after staining. In the AM group, values increased significantly with increased immersion time. However, in the SM group, a significant difference was only observed between the 12-day and 36-day intervals, and no significant difference was found in the HC group across durations. Conclusion: Additive manufacturing showed significantly lower color stability compared to subtractive manufacturing and heat-curing methods, while no significant differences were found between subtractive manufacturing and heat-curing methods.

목적: 절삭 가공(SM), 적층 가공(AM) 및 열중합(HC) 방식으로 제작한 의치상 레진을 착색용액에 침전시켜 색 변화를 통해 색안정성을 비교하고자 하였다. 연구 재료 및 방법: 각각의 방식으로 제작한 시편을 착색용액인 커피용액에 12일, 24일, 36일간 침전시킨 후 분광측색계로 색 변화(ΔE*)를 측정하고, 일원배치 분산분석 및 반복측정 분산분석으로 통계 분석하였다. 결과: AM 군은 착색을 시행한 후 모든 시점에서 ΔE*값이 가장 높게 나타났으며, SM 군과 HC 군 간에는 유의한 차이를 보이지 않았다. 모든 군에서 착색 전후 유의한 색 변화가 관찰되었고, AM 군은 착색 기간의 증가에 따라 ΔE*가 지속적으로 상승한 반면, SM 군은 12일과 36일 간 차이만 유의했으며 HC 군은 기간별 차이가 없었다. 결론: 적층 가공 방식은 절삭 가공 방식과 열중합 방식에 비해 색안정성이 유의하게 낮았다. 절삭 가공 방식과 열중합 방식 간에는 유의한 차이가 없었다.

Keywords

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