J Adv Prosthodont.  2014 Aug;6(4):309-316. 10.4047/jap.2014.6.4.309.

The effect of repeated firings on the color change and surface roughness of dental ceramics

• Gonuldas F
• Yilmaz K
• Ozturk C

• KMID: 1974851
• DOI: http://doi.org/10.4047/jap.2014.6.4.309

Abstract

PURPOSE
The color of the ceramic restorations is affected by various factors such as brand, thickness of the layered the ceramic, condensation techniques, smoothness of surface, number of firings, firing temperature and thickness of dentin. The aim of this study was to evaluate the color change and surface roughness in dental porcelain with different thicknesses during repeated firings.
MATERIALS AND METHODS
Disc-shaped (N=21) metal-ceramic samples (IPS Classic; Ivoclar Vivadent; Shaar, Liechtenstein) with different thickness were exposed to repeated firings. Color measurement of the samples was made using a colorimeter and profilometer was used to determine surface roughness. ANOVA and Tukey tests with repeated measurements were used for statistical analysis.
RESULTS
The total thickness of the ceramics which is less than 2 mm significantly have detrimental effect on the surface properties and color of porcelains during firings (P<.05).
CONCLUSION
Repeated firings have effects on the color change and surface roughness of the dental ceramics and should be avoided.

Keyword

Repeated firings; Color change; Surface roughness; Dental ceramics

MeSH Terms

Ceramics*
Dental Porcelain
Dentin
Fires*
Surface Properties
Ceramics
Dental Porcelain

Figure

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  Fig. 1 Diagram of CIE L*a*b* system.

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  Fig. 2 Custom made two-pieces teflon mold for standardization.

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  Fig. 3 Colorimeter (Minolta CR 321, Konica Minolta, Tokyo, Japan).

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  Fig. 4 Perthometer M2 (Mahr GmbH, Gottingen, Germany).

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  Fig. 5 ΔE Value changes of different thickness for repeated firings.

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  Fig. 6 Ra values changes of different ceramic thickness for repeated firings.

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