The influence of repeated firing on color stability of two porcelain types

Ghanbarzadeh, J. and Sabooni, M. R. and Amiri Tehrani, N. (2008) The influence of repeated firing on color stability of two porcelain types. Journal of Medical Sciences, 8 (1). pp. 77-80.

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Abstract

The aim of this study was to evaluate the effect of repeated firings on the color stability of Vita VMK95 and Ivoclar IPS classic metal ceramic porcelain systems using a colorimetric. In this experimental in vitro study, 24 disc-shaped specimens, 10 mm in diameter with a 0.3 mm base metal alloy (Supercast) thickness were prepared and two types of porcelains, a 0.2 mm opaque and a one millimeter dentine porcelain (Shade A3) thickness, were applied on them. Samples were fired one, three and six times. Color measurement was carried out after each firing using a colorimeter (Minolta, CR-10) and data were expressed in Commission Internationale I'Eclairage (CIE-LAB) system coordinates. In this study, the parametric paired t-test was used to analyze the data. After six times of firing the 1*, a* and b* parameters were significantly different, before and after aging, for Vita VMK95 (respectively p = 0.043, p = 0.002, p<0.001); however for Ivoclar IPS classic, only a* parameter was significant difference before and after aging (p<0.001). After repeated firing, color stability of Ivoclar IPS classic was better than Vita VMK95 porcelain.

Item Type: Article
Additional Information: Export Date: 16 February 2020 Correspondence Address: Ghanbarzadeh, J.; Department of Prosthodontics, Faculty of Dentistry, Mashhad University of Medical Sciences, Vakilabad Blvd, Mashhad 91735, Iran
Uncontrolled Keywords: Color stability Porcelain Repeated firing alloy aging article ceramic prosthesis colorimetry controlled study dentin high temperature in vitro study Student t test tooth color tooth prosthesis
Subjects: WU Dentistry. Oral surgery
Divisions: Mashhad University of Medical Sciences
Depositing User: mr lib3 lib3
Date Deposited: 29 Apr 2020 08:16
Last Modified: 29 Apr 2020 08:16
URI: http://eprints.mums.ac.ir/id/eprint/16827

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