1. Culpepper WD. A comparative study of shade-matching procedures. J Prosthet Dent. 1970; 24:166–173.
2. Lombardi RE. The principles of visual perception and their clinical application to denture esthetics. J Prosthet Dent. 1973; 29:358–382.
3. Sproull RC. Color matching in dentistry. 3. Color control. J Prosthet Dent. 1974; 31:146–154.
4. Brodbelt RH, O'Brien WJ, Fan PL. Translucency of dental porcelains. J Dent Res. 1980; 59:70–75.
5. Miyagawa Y, Powers JM, O'Brien WJ. Optical properties of direct restorative materials. J Dent Res. 1981; 60:890–894.
6. O'Keefe KL, Pease PL, Herrin HK. Variables affecting the spectral transmittance of light through porcelain veneer samples. J Prosthet Dent. 1991; 66:434–438.
7. Watts DC, Cash AJ. Analysis of optical transmission by 400-500 nm visible light into aesthetic dental biomaterials. J Dent. 1994; 22:112–117.
8. ten Bosch JJ, Coops JC. Tooth color and reflectance as related to light scattering and enamel hardness. J Dent Res. 1995; 74:374–380.
9. Pecho OE, Ghinea R, Ionescu AM, Cardona JC, Della Bona A, Pérez Mdel M. Optical behavior of dental zirconia and dentin analyzed by Kubelka-Munk theory. Dent Mater. 2015; 31:60–67.
10. Stawarczyk B, Liebermann A, Eichberger M, Güth JF. Evaluation of mechanical and optical behavior of current esthetic dental restorative CAD/CAM composites. J Mech Behav Biomed Mater. 2015; 55:1–11.
11. Johnston WM, Ma T, Kienle BH. Translucency parameter of colorants for maxillofacial prostheses. Int J Prosthodont. 1995; 8:79–86.
12. Ragain JC Jr, Johnston WM. Accuracy of Kubelka-Munk reflectance theory applied to human dentin and enamel. J Dent Res. 2001; 80:449–452.
13. Çömlekoğlu ME, Paken G, Tan F, Dündar-Çömlekoğlu M, Özcan M, Akan E, Aladağ A. Evaluation of different thickness, die color, and resin cement shade for veneers of multilayered CAD/CAM blocks. J Prosthodont. 2016; 25:563–569.
14. Jurišić S, Jurišić G, Zlatarić DK. In vitro evaluation and comparison of the translucency of two different all-ceramic systems. Acta Stomatol Croat. 2015; 49:195–203.
15. Harlow JE, Rueggeberg FA, Labrie D, Sullivan B, Price RB. Transmission of violet and blue light through conventional (layered) and bulk cured resin-based composites. J Dent. 2016; 53:44–50.
16. Pecho OE, Ghinea R, do Amaral EA, Cardona JC, Della Bona A, Pérez MM. Relevant optical properties for direct restorative materials. Dent Mater. 2016; 32:e105–e112.
17. Kim HK, Kim SH, Lee JB, Han JS, Yeo IS, Ha SR. Effect of the amount of thickness reduction on color and translucency of dental monolithic zirconia ceramics. J Adv Prosthodont. 2016; 8:37–42.
18. Harada R, Takemoto S, Hattori M, Yoshinari M, Oda Y, Kawada E. The influence of colored zirconia on the optical properties of all-ceramic restorations. Dent Mater J. 2015; 34:918–924.
19. Hyun HK, Ferracane JL. Influence of biofilm formation on the optical properties of novel bioactive glass-containing composites. Dent Mater. 2016; 32:1144–1151.
20. Lee WS, Kim SY, Kim JH, Kim WC, Kim HY. The effect of powder A2/powder A3 mixing ratio on color and translucency parameters of dental porcelain. J Adv Prosthodont. 2015; 7:400–405.
21. Pop-Ciutrila IS, Dudea D, Eugenia Badea M, Moldovan M, Cîmpean SI, Ghinea R. Shade correspondence, color, and translucency differences between human dentine and a CAD/CAM hybrid ceramic system. J Esthet Restor Dent. 2016; 28:S46–S55.
22. Güth JF, Kauling AE, Ueda K, Florian B, Stimmelmayr M. Transmission of light in the visible spectrum (400-700 nm) and blue spectrum (360-540 nm) through CAD/CAM polymers. Clin Oral Investig. 2016; 20:2501–2506.
23. Özarslan MM, Büyükkaplan UŞ, Barutcigil Ç, Arslan M, Türker N, Barutcigil K. Effects of different surface finishing procedures on the change in surface roughness and color of a polymer infiltrated ceramic network material. J Adv Prosthodont. 2016; 8:16–20.
24. Al Kheraif AA, Qasim SS, Ramakrishnaiah R, Ihtesham ur Rehman . Effect of different beverages on the color stability and degree of conversion of nano and microhybrid composites. Dent Mater J. 2013; 32:326–331.
25. Stawarczyk B, Sener B, Trottmann A, Roos M, Ozcan M, Hämmerle CH. Discoloration of manually fabricated resins and industrially fabricated CAD/CAM blocks versus glass-ceramic: effect of storage media, duration, and subsequent polishing. Dent Mater J. 2012; 31:377–383.
26. Samra AP, Pereira SK, Delgado LC, Borges CP. Color stability evaluation of aesthetic restorative materials. Braz Oral Res. 2008; 22:205–210.
27. Acar O, Yilmaz B, Altintas SH, Chandrasekaran I, Johnston WM. Color stainability of CAD/CAM and nanocomposite resin materials. J Prosthet Dent. 2016; 115:71–75.
28. Ilie N, Hickel R. Correlation between ceramics translucency and polymerization efficiency through ceramics. Dent Mater. 2008; 24:908–914.
29. Ardu S, Braut V, Gutemberg D, Krejci I, Dietschi D, Feilzer AJ. A long-term laboratory test on staining susceptibility of esthetic composite resin materials. Quintessence Int. 2010; 41:695–702.