Shade reproduction and the ability of lithium disilicate ceramics to mask dark substrates
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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.
Abstract
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.
참고문헌 (19)
- Land MF, "Survival rates of all-ceramic systems differ by clinical indication and fabrication method", J Evid Based Dent Pract, 10, pp.37~38 (2010)
- Calamia JR, "Porcelain laminate veneers : reasons for 25 years of success", Dent Clin North Am, 51, pp.399~417 (2007)
- Giordano R, "Ceramics overview : classification by microstructure and processing methods", Compend Contin Educ Dent, 31, pp.682~700 (2010)
- Niu E, "Color match of machinable lithium disilicate ceramics : effects of cement color and thickness", J Prosthet Dent, 111, pp.42~50 (2014)
- Chen XD, "The influence of resin cements on the final color of ceramic veneers", J Prosthodont Res, 59, pp.172~177 (2015)
- Pires LA, "Effects of the type and thickness of ceramic, substrate, and cement on the optical color of a lithium disilicate ceramic", J Prosthet Dent, 117, pp.144~149 (2017)
- Shokry TE, "Effect of core and veneer thicknesses on the color parameters of two all-ceramic systems", J Prosthet Dent, 95, pp.124~129 (2006)
- Son HJ, "Influence of dentin porcelain thickness on layered all-ceramic restoration color", J Dent, 38(Supplement 2), pp.e71~e77 (2010)
- Bagis B, "Optical properties of current ceramics systems for laminate veneers", J Dent, 41(Supplement 3), pp.e24~e30 (2013)
- Lee YK, "Translucency of human teeth and dental restorative materials and its clinical relevance", J Biomed Opt, 20, pp.045002~ (2015)
- Öngül D, "Visual and instrumental evaluation of color match ability of 2 shade guides on a ceramic system", J Prosthet Dent, 108, pp.9~14 (2012)
- Vichi A, "Color related to ceramic and zirconia restorations : a review", Dent Mater, 27, pp.97~108 (2011)
- Dede DO, "Influence of the color of composite resin foundation and luting cement on the final color of lithium disilicate ceramic systems", J Prosthet Dent, 117, pp.138~143 (2017)
- Skyllouriotis AL, "Masking properties of ceramics for veneer restorations", J Prosthet Dent, 118, pp.517~523 (2017)
- Basso GR, "Masking colored substrates using monolithic and bilayer CAD-CAM ceramic structures", Oper Dent, 42, pp.387~395 (2017)
- Chu FC, "Contrast ratios and masking ability of three types of ceramic veneers", J Prosthet Dent, 98, pp.359~364 (2007)
- Vichi A, "Influence of ceramic and cement thickness on the masking of various types of opaque posts", J Prosthet Dent, 83, pp.412~417 (2000)
- Kim SJ, "Translucency and masking ability of various opaque-shade composite resins", J Dent, 37, pp.102~107 (2009)
- Pande N, "Spectrophotometric evaluation of shade reproduction of pressable all-ceramic system on un-stained and stained tooth : an in vitro study", J Indian Prosthodont Soc, 16, pp.63~69 (2016)