Article | 12. 2018 Vol. 18, Issue. 6
Effect of translucency on CAD/CAM ceramic according to different core/veneer thickness

Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University1

2018.12. 1037:1045


Objectives: The purpose of this study was to evaluation the effect of translucency on CAD/CAM ceramic according to different core/veneer thicknesses. Methods: A total of 42 samples from 2 groups of 7 ceramic cores, each with 3 thickness values (0.8, 1.0, 1.2 mm) were manufactured. The veneers were also manufactured in 3 thicknesses (0.3, 0.5, 0.7 mm). The group names were based on the name of the ceramic core (IPS e.Max CAD; LD, and IPS Empress CAD; LR). The associated number was determined by the combined thickness of the core and veneer: 1 = (0.8 + 0.7); 2 = (1.0 + 0.5); 3 = (1.2 + 0.3). The translucency was measured using a spectrophotometer and defined via the contrast ratio (CR) and translucency parameter (TP). Two-way ANOVA was performed to compare the 2 groups (material and thickness). Results: As the core thickness increased, the TP value also increased, and the CR value (for LR group) decreased. The results of 2-way ANOVA demonstrated that the thicknesses of different core/veneer combinations significantly affected the translucency (p<0.05). Conclusions: The different core and veneer thicknesses affected the translucency of CAD/CAM ceramic.

1.  [1] Wee AG, Monaghan P, Johnston WM. Variation in color between intended matched shade and fabricated shade of dental porcelain. J Prosthet Dent 2002;87(6):657-66.   

2.  [2] Nakamura T, Satio O, Fuyikawa J, Ishigaki S. Influence of abutment substrate and seramic thickness on the colour of heat-pressed cereamic crowns. J Oral Rehabil 2002;29:805-9.   

3.  [3] Vichi A, Ferrari M, Davidson CL. Influence of ceramic and cement thickness on the masking of various types of opaque posts. J Prosthet Dent 2000;83:412-7.   

4.  [4] Raptis NV, Michalakis KX, Hirayama H. Optical behavior of current ceramic systems. Int J Periodontics Restorative Dent 2006;26:31-41.   

5.  [5] Rosenstiel SF, Land MF, Fujimoto J. Contemporary fixed prosthodontics. 5th ed. St. Louis: Mosby; 2016: 264-5.   

6.  [6] Miyazaki T, Hotta Y, Kunii J, Kuriyama S, Tamaki Y. A review of dental CAD/CAM: current status and future perspectives from 20 years of experience. Dental Mater 2009;28:44-56.   

7.  [7] Guarda GB, Correr AB, Gonçalves LS, Costa AR, Borges GA, Sinhoreti MA, et al. Effects of surface treatments, thermocycling, and cyclic loading on the bond strength of a resin cement bonded to a lithium disilicate glass ceramic. Oper Dent 2013;38:208-17.   

8.  [8] Dozic A, Kleverlaan CJ, Meegdes M, van der Zel J, Feilzer AJ. The influence of porcelain layer thickness on the final shade of ceramic restorations. J Prosthet Dent 2003;90(6):563-70.   

9.  [9] Davins SP, Myslinski NR. Shade selection by color vision-defective dental personnel. J prosthet Dent 1990;63:97-101.   

10.  [10] Turgut S, Bagis B, Turkaslan SS, Bagis YH. Effect of ultraviolet aging on translucency of resin-cemented ceramic veneers: An in vitro study. J Prosthodont 2014;23:39-44.   

11. [11] Wyszecki G, Stiles WS. Color science: concepts and methods, quantitative data and formula. New York: Wiley; 1982: 567-9.   

12. [12] Wang F, Takahashi H, Iwasaki N. Translucency of dental ceramics with different thicknesses. J Prosthet Dent 2013;110:14-20.   

13. [13] Yu B, Ahn JS, Lee YK. Measurement of translucency of tooth enamel and dentin. Acta Odontol Scand 2009;67:57-64.   

14. [14] Spink LS, Rungruanganut P, Megremis S, Kelly JR. Comparison of an absolute and surrogate measure of relative translucency in dental ceramics. Dent Mater 2013;29:70-7.   

15. [15] Bayindir F, Kuo S, Johnston WM, Wee AG. Coverage error of three conceptually different shade guide systems to vital unrestored dentition. J Prosthet Dent 2007;98: 175-85.   

16. [16] Oguro R, Nakajima M, Seki N, Sadr A, Tagami J, Sumi Y. The role of enamel thickness and refractive index on human tooth colour. J Dent 2016;51:36-44.   

17.  [17] Ten Bosch JJ, Coops JC. Tooth color and reflectance as related to light scattering and enamel hardness. J Dent Res 1995;74:374-80.   

18. [18] Stroud JL, Buschang PH, Giaz PW. Sexual dimorphism in mesiodistal dentin and enamel thickness. Dentomaxillofac Radiol 1994;233:169-71.   

19. [19] Holloway JA, Miller RB. The effect of core translucency on the aesthetics of all-ceramic restorations. Pract Periodontics Aesthet Dent 1997;9:567-74.   

20. [20] Kelly JR, Nishimura I, Campbell SD. Ceramics in dentistry: historical roots and current perspectives. J Prosthet Dent 1996;75(1):18-32.   

21. [21] Heffernan MJ, Aquilino SA, Diaz-Arnold AM, Haselton DR, Stanford CM, Vargas MA. Relative translucency of six all-ceramic systems. Part Ⅱ: core and veneer materials. J Prosthet Dent 2002;98:10-15.   

22.  [22] Antonson SA, Anusavice KJ. Contrast ratio of veneering and core ceramics as a function of thickness. Int J Prosthodont 2001;14(4):316-20.   

23. [23] Johnston WM, Ma T, Kienle BH. Translucency parameter of colorants for maxillofacial prostheses. Int J Prosthodont 1995;8(1):79-86.   

24. [24] Zhang Y, Griggs JA, Benham AW. Influence of powder/liquid mixing ratio on porosity and translucency of dental porcelains. Prosthet Dent 2004;91(2):128-35.   

25. [25] O’Brien WJ, Groh CL, Boenke KM. A new, small-color-difference equation for dental shades. J Dent Res 1990;69:1762-4.   

26. [26] Jin HJ. A comparative study on the translucency of various all-ceramic crown materials[Doctoral dissertation]. Seoul: Univ. of Korea, 2006.   

27.  [27] Baltzer A, Kaufmann-Jinoian V. Shading of ceramic crowns using digital tooth shade matching devices. Int J Comput Dent 2005;8(2):129-52.   

28. [28] Bolt RA, Bosch JJ, Coops JC. Influence of window size in small-window colour measurement, particularly of teeth. Phys Med Biol 1994;39:1133-42.   

29. [29] Ragain Jr. JC, Johnston WM. Accuracy of Kubelka-Munk reflectance theory applied to human dentin and enamel. J Dent Res 2001;80:449-52.   

30. [30] Kursoglu P, Motro PFK, Kazazoglu E. Translucency of ceramic material in different core-veneer combinations. J Prosthet Dent 2015;113(1):48-53.   

31. [31] Della Bona A, Nogueira AD, Pecho OE. Optical properties of CAD–CAM ceramic systems. Journal of dentistry 2014;42(9):1202-9.   

32. [32] Ilie N, Hickel R. Correlation between ceramics translucency and polymerization efficiency through ceramics. Dental Mater 2008;24:908-14.   

33. [33] Nogueira AD, Della Bona A. The effect of a coupling medium on color and translucency of CAD–CAM ceramics. J Dent 2013;41:e18-e23.   

online submission
online submission
online submission
online submission
online submission
Sub Menu
Sub Banner
Sub Menu
Sub Banner
Sub Banner
Sub Banner
Sub Banner
Sub Menu
Sub Menu