EFFECT OF REPRESSING ON THE COLOR AND TRANSLUENCY OF LITHIUM DISILICATE PRESSABLE CERAMIC MATERIAL

Document Type : Original Article

Authors

1 Instructor of Fixed Prosthodontics, Department of Conservative Dentistry, Alexandria University, Alexandria, Egypt

2 Professor of Fixed Prosthodontics and former Dean, Department of Conservative Dentistry, Alexandria University, Alexandria, Egypt

3 Lecturer of Fixed Prosthodontics, Department of Conservative Dentistry, Alexandria University, Alexandria, Egypt

Abstract

as chemical composition and thickness. In clinical practice, pressable ceramics were found to be frequently subjected to repressing. Nonetheless, the effect of the repressing on the color stability and translucency have been unknown.
OBJECTIVES: The aim of this study was to investigate the effect of repressing on the color and translucency of a lithium disilicate pressable ceramic material (e.max press).
MATERIALS AND METHODS: twenty-four disc-shaped ceramic specimens (IPS e.max press ingots) 14 mm in diameter and 1.5 mm thick were divided into two parallel groups: press group and repress group. Each group had 12 specimens. Pressing was performed for e.max press ingots. Repressing was performed using the remaining material resulting from the pressing procedure. Color difference and translucency were measured using a portable spectrophotometer (VITA easy shade Advance). Translucency parameter (TP) was measured on black and white backgrounds. The resultant data were analyzed statistically using Kruskal-Wallis non-parametric test.
RESULTS: There was a statistically significant difference in color change after repressing. (p=0.005). e.max pressed group produced color difference (ΔE) values of (3.88±1.12). This (ΔE) values was more than the selected clinical perceptible threshold selected for this study (ΔE=2.6). Moreover, e.max pressed group showed statistically significant decrease in translucency after repressing (p=0.002).
CONCLUSIONS: The color of e.max press was affected by repressing with statistically significant decrease in translucency.

Keywords

Main Subjects

References

1- Shenoy A, Shenoy N. Dental ceramics: An update. J Conserv Dent. 2010;13:195–203.
2- Narasimha RR. Ceramics in Dentistry. In: Lakshmanan A, ed. Sintering of Ceramics - New Emerging Techniques. Vienna, Austria: IntechOpen; 2012:203-26.
3- Ansong R, Flinn B, Chung KH, Mancl L, Ishibe M, Raigrodski AJ. Fracture toughness of heat-pressed and layered ceramics. J Prosthet Dent. 2013;109: 234-40.
4- Denry I, Holloway JA. Ceramics for dental applications: a review. Materials. 2010;3:351-68.
5- Alkadi L, Ruse ND. Fracture toughness of two lithium disilicate dental glass ceramics. J Prosthet Dent [Internet]. 2016;116:591–6.
6- Conrad HJ, Seong WJ, Pesun IJ. Current ceramic materials and systems with clinical recommendations: A systematic review. J Prosthet Dent. 2007;98:389-404.
7- Da Costa GC, Aras MA, Chalakkal P, Da Costa MC. Ocular prosthesis incorporating IPS e-max press scleral veneer and a literature review on non-integrated ocular prosthesis. Int J Ophthalmol. 2017;10:148-56.
8- Albakry M, Guazzato M, Swain MV. Biaxial flexural strength and microstructure changes of two recycled pressable glass ceramics. J Prosthet Dent. 2004;13:141-9.
9- Raigrodski AJ, Chiche GJ, Potiket N, Hochstedler JL, Mohamed SE, Billiot S, et.al. The efficiency of posterior three-unit zirconia –oxide-based ceramic fixed partial dental prostheses: a prospective clinical pilot study. J Prosthet Dent. 2006;96:237-44.
10-Chu FCS, Chow TW, Chai J. Contrast ratios and masking ability of three types of ceramic veneers. J Prosthet Dent. 2007;98:359–64.
11-Vichi A, Louca C, Corciolani G, Ferrari M. Color related to ceramic and zirconia restorations: A review. Dent Mater. 2011;27:97–108.
12-Douglas RD, Steinhauer TJ, Wee AG. Intraoral determination of the tolerance of dentists for perceptibility and acceptability of shade mismatch. J Prosthet Dent. 2007;97:200-8.
13-Hammad IA. Intrarater repeatability of shade selections with two shade guides. J Prosthet Dent. 2003;89:50–3.
14-Heydecke G, Zhang F, Razzoog ME. In vitro color stability of double-layer veneers after accelerated aging. J Prosthet Dent. 2001;85:551-7.
15-Knezović D, Zlatarić D, Illeš IZ, Alajbeg M, Žagar. In Vivo and in Vitro Evaluations of Repeatability and
Accuracy of VITA Easyshade® Advance 4.0 Dental Shade-Matching Device. Acta Stomatol Croat. 2015;49: 112–18.
16-Niu E, Agustin M, Douglas RD. color match of machinable lithium disilicate ceramics: effects of cement color and thickness. J prosthet dent. 2014;111:42-50.
17-O’Brien WJ, Groh CL, Boenke KM. A New, Small-color-difference Equation for Dental Shades. J Dent Research.1990;69:1762-4.
18-Albakry M, Guazzato M, Swain MV. Biaxial flexural strength and microstructure changes of two recycled pressable glass ceramics. J Prosthet Dent. 2004;13:141-9.
19-Heffernan MJ, Aquilino SA, Diaz-Arnold AM, Haselton DR, Stamford CM, Vargas MA. Relative translucency of six all-ceramic systems. Part I: Core materials. J Prosthet Dent. 2002;88:4-9.
20-Johnston WM, O’Brien WJ, Tien TY. The determination of optical absorption and scattering in translucent porcelain. Color Res Appl. 1986;11:125-30.
21-Johnston WM, Reisbick MH. Color and translucency changes during and after curing of esthetic restorative materials. Dent Mater. 1997;13: 89-97.
22-Zaghloul H, Halim C, Ghanim LA. Effect of repeated heat pressing on color, translucency and surface quality of pressable ceramics. E.D.J. 2013;59:2913-31.
23-El-Etreby AS. Effect of repressing and glazing on color reproduction, translucency and surface roughness of lithium disilicate glass-ceramics. E.D.J. 2017;63:79-88.
Alexandria Dental Journal
Volume 46, Issue 1
B (Endodontics, Prosthodontics, Fixed prosthodontics, Conservative dentistry, Dental Biomaterials)
April 2021
Pages 102-105

Files

Share

How to cite

Statistics