Restorative Dentistry and Endodontics

  • 제45권3호
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  • Pages.41.1-41.7
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  • 2020
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  • 2234-7658(pISSN)
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  • 2234-7666(eISSN)
대한치과보존학회 (The Korean Academy of Conservative Dentistry)
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Shade reproduction and the ability of lithium disilicate ceramics to mask dark substrates

  • Iravani, Maryam (Department of Restorative, Shahid Beheshti University of Medical Sciences Faculty of Dentistry) ;
  • Shamszadeh, Sayna (Dental Research Center, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences) ;
  • Panahandeh, Narges (Dental Research Center, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences) ;
  • Sheikh-Al-Eslamian, Seyedeh Mahsa (Dental Research Center, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences) ;
  • Torabzadeh, Hassan (Dental Research Center, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences)
  • 투고 : 2019.09.22
  • 심사 : 2020.04.06
  • 발행 : 2020.08.31
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초록

Objectives: This study aimed to evaluate the ability of lithium disilicate ceramics to reproduce the A2 shade and to mask A4 substrates. Materials and Methods: Twenty-four discs (8 mm in diameter, shade A2) of high translucency (groups 1-3) and low translucency (groups 4-6) of IPS e.max ceramic with different thicknesses (0.5, 0.75, and 1 mm) were fabricated as monolithic structures. In addition, discs of medium opacity (group 7-8) with different core/veneer combinations (0.3 mm/0.7 mm and 0.5 mm/0.5 mm) were fabricated as bilayer structures. Specimens were superimposed on an A4 substrate (complex). The color changes of the complex were measured using a spectrophotometer on a black background, and the ΔE values of the complex were compared with either the A4 substrate or the A2 shade tab. One-way analysis of variance, the Tukey honest significant difference test, and the Fisher test were used to analyze the data (p < 0.05). Results: Significant between-group differences were found for comparisons to both the A4 substrate and the A2 shade (p < 0.05). When compared with the A4 substrate, the ΔE values in all groups were in the non-acceptable range. When compared with the A2 shade, the ΔE values in all groups, except groups 2 and 3, were in the clinically acceptable range. Conclusions: All translucencies and thicknesses masked the underlying dark substrate. However, the low-translucency IPS e.max Press better reproduced the A2 shade.

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참고문헌

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피인용 문헌

  1. Effect of CAD/CAM Ceramic Thickness on Shade Masking Ability of Discolored Teeth: In Vitro Study vol.18, pp.24, 2020, https://doi.org/10.3390/ijerph182413359