Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Adhesion between heat-pressed lithium disilicate veneer and zirconia framework: Shear bond strength evaluation

열가압 리튬 디실리케이트 전장도재와 지르코니아 하부구조의 전단결합강도 평가

  • Kim, Jae-Hong (Department of Dental Laboratory Science, College of Health Science, Catholic University of Pusan)
  • 김재홍 (부산가톨릭대학교 보건과학대학 치기공학과)
  • Received : 2019.11.04
  • Accepted : 2020.03.06
  • Published : 2020.03.31
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Abstract

This study examined the shear bond strength between the zirconia core and pressed lithium disilicate veneering ceramics. The Schmitz-Schulmeyer test method was used to investigate the core-veneer shear bond strength of industrially manufactured zirconia core ceramic (Zirtooth, HASS, Gangneung, Korea) and pressed veneer ceramic (IPS e.max Zirpress, Vita PM9, GC Initial IQ, HASS Rosetta SM) (N=40). Data were statistically analyzed using one-way ANOVA and Tukey's test (a=0.05). The fractured surfaces of the specimens were examined to determine the failure pattern using a digital microscope. The mean ± SD shear bond strength in MPa were 16.69±3.11, 14.21±3.63, 11.17±2.92, and 27.90±5.71 for IPS e.max Zirpress, VITA PM9, GC Initial IQ, and HASS Rosetta SM, respectively. The average shear bond strength was largest for HASS Rosetta SM, followed by IPS e.max Zirpress, Vita PM9, and GC Initial IQ(p<0.05). The digital microscopy examination of the fracture surface showed adhesive and cohesive failure in pressed lithium disilicate veneering ceramics. The use of lithium disilicate veneer ceramic produced a significantly higher shear bond strength.

본 연구의 목적은 shear bond strength을 이용하여 pressed lithium disilicate 전장도재와 zirconia core의 접착을 비교 분석하는 것이다. Zirconia blank(Zirtooth, HASS, Gangneung, Korea)에 각 pressed ceramic(IPS e.max Zirpress, Vita PM9, GC Initial IQ, HASS Rosetta UP)이 적용된 시편을 제작하였다(N=40). 전단결합강도를 비교 평가하기 위해 The Schmitz-Schulmeyer test method을 이용하였고 산출된 파괴하중의 값을 분석했다. 산출된 네 가지 전단결합강도 값들 간의 평균 비교는 일원분산분석(one-way ANOVA)을 통해 이루어졌고, Tukey의 사후검정을 실시하여 서로 간의 평균 차이가 통계적으로 유의함을 검증하였다. 또 파절면의 3D 분석을 통하여 파괴 표면을 관찰하여, 그 파괴 양상도 분류하였다. 실험군별 전단결합강도는 IPS e.max Zirpress 16.69±3.11MPa, VITA PM9 14.21±3.63MPa, GC Initial IQ 11.17±2.92MPa, HASS Rosetta SM 27.90±5.71MPa이었으며, Lithium disilicate ceramic veneer(HASS Rosetta SM)의 결합 강도는 다른 제품들보다 통계적으로 유의하게 높았다(p<0.05). 또, 파괴면의 유형 분류 결과, 모든 시편에서 cohesive 파괴는 관찰되지 않았고 주로 adhesive와 cohesive가 같이 조합된 파괴 유형이 관찰되었다. 본 연구 결과에 의해서 pressed lithium disilicate 전장도재가 기존의 pressed to zirconia system보다 나은 접착력을 보여주었다.

Keywords

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