구강회복응용과학지 (Journal of Dental Rehabilitation and Applied Science)

  • 제37권3호
  • /
  • Pages.111-122
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  • 2021
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  • 2384-4353(pISSN)
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  • 2384-4272(eISSN)
대한턱관절교합학회 (Korean Academy of Stomatognathic Function and Occlusion)
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Translucent zirconia의 layer 간 비교 및 추가적인 소성이 굽힘강도, 투과도에 미치는 영향

The comparisons of layers and the effect of additional firings on flexural strength and translucency of 5Y-ZP

  • 김형준 (단국대학교 치과대학 치과보철학교실) ;
  • 신수연 (단국대학교 치과대학 치과보철학교실)
  • Kim, Hyung-Joon (Department of Prosthodontics, College of Dentistry, Dankook University) ;
  • Shin, Soo-Yeon (Department of Prosthodontics, College of Dentistry, Dankook University)
  • 투고 : 2021.06.21
  • 심사 : 2021.07.20
  • 발행 : 2021.09.30
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초록

목적: 5Y-ZP의 세가지 층 간 굽힘강도, 투과도를 비교하고 추가적인 소성이 미치는 영향을 연구하고자 하였다. 연구 재료 및 방법: 소결한 지르코니아 블록을 세가지 층에 따라 분리한 후 원형 디스크 시편을 제작하였다. 시편의 직경은 15.0 mm이며, 2축굽힘강도와 투과도를 측정하기 위한 시편의 두께는 각각 1.2 mm와 1.0 mm이다. 시편들을 추가적인 소성 횟수(0, 1, 3번)에 따라 세 군으로 분류한 후 추가적인 소성은 900℃ 이하의 온도에서 퍼니스를 사용하여 소성 횟수에 따라 시행하였다. 만능재료시험기와 자외선-가시광선 분광광도계를 사용하여 2축굽힘강도와 투과도를 측정하였다. 상의 변화를 관찰하기 위해 X선 회절 분석을 시행하였다. 측정값은 One-way ANOVA, Tukey HSD test를 통하여 분석하였다(α = 0.05). 결과: 층 간 2축굽힘강도는 유의한 차이가 없었지만(P > 0.05) 투과도는 유의한 차이가 있었다(P < 0.05). 절단 및 전이층은 1번의 추가적인 소성 후 굽힘강도가 유의하게 감소하였으며, 3번의 추가적인 소성 후에는 모든 층의 굽힘강도가 소성 전과 비교하여 유의하게 감소하였다. 몸체 층을 제외한 나머지 층들은 추가적인 소성 후에 투과도가 유의하게 감소하였다. 모든 그룹의 X선 회절 분석 결과는 유사하였다. 결론: 5Y-ZP의 세 층은 투과도의 차이만 존재하였다. 추가적인 소성은 각 층의 굽힘강도와 투과도에 다른 영향을 미쳤으나 상전이는 발견되지 않았다.

Purpose: The purpose of this in vitro study was to investigate the flexural strength and translucency of three layers in 5Y-ZP and to assess the effect of additional firings on these properties. Materials and Methods: Sintered zirconia blocks were sectioned according to three layers : incisal, transition, and body. Disc-shaped specimens were fabricated from each layer. The diameter of specimens was 15.0 mm and each thickness of specimens for biaxial flexural strength test and translucency was 1.2 mm and 1.0 mm. The specimens were classified into subgroups according to the number of firing (0, 1, and 3 times; n = 10/subgroup) and the additional firings were performed under 900℃ using a furnace. Biaxial flexural strength and translucency was measured using universal testing machine and uv-vis spectrophotometer. X-ray diffraction (XRD) analysis was used for measurement of the phase identification. One-way ANOVA, Tukey HSD test were performed (α = 0.05). Results: There was no significant difference in flexural strength between the three layers (P > 0.05), while there was significant difference in translucency between different layers (P < 0.05). The flexural strength of incisal and transition layer was decreased by the single additional firing, and the three additional firings significantly decreased the flexural strength of three layers. The translucency of layer was decreased by additional firings except the body layer. The XRD patterns of all groups were similar. Conclusion: Three layers of 5Y-ZP were different only in translucency. Additional firings affected the flexural strength and translucency differently depending on the layers but crystalline phases were not changed.

키워드

과제정보

This study was financially supported by Department of Prosthodontics, College of Dentistry, Dankook University.

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