Color Stability of Four Porcelain Materials Against to Staining Agents

Objectives: Dental porcelain restorations should reproduce similar optical effects as natural tooth structure to achieve a good color match. Discoloration of porcelain materials can result in patient dissatisfaction and additional expense for replacement. The purpose of this study was to determine the color stability of 4 different dental porcelain materials against to tea, coffee and cigarette smoke. Methods: A total of 80 disc-shaped specimens ( 12 mm in diameter and 1.5 mm thick) were fabricated with 4 dental porcelain materials (D-Sign, Finesse, Omega 900, VM7) according to manufacturers' instructions (n= 20). Twenty specimens of each group were divided into five specimens containing subgroups for exposure to one of the following four environments: distilled water (control group), tea, coffee, and cigarette smoke. Color value (L*, a*, b*) of each specimen was measured with a colorimeter (Minolta CR 300 Minolta Inc Osaca Japan) in the period of 1 day, 10 days,and 20 days. Color change (DE) was calculated and data were analyzed with 2-way ANOVA. In addition, Clemex Imagining Analyzer was used to determine color change of materials by the time visually. Results: There were no statistically significant differences among porcelain materials (p›0.05), however the difference among staining agents was significant (p‹0.05). Cigarette smoke produced the highest discoloration in all porcelains materials followed by tea and coffee solutions. Tea and coffee solutions were produced the similar discoloration in tested materials. All staining agents were showed much discoloration on porcelain surfaces by the time. Conclusions: Discoloration of porcelain materials against to cigarette smoke at each time period was greater than other staining agent and considered clinically unacceptable.

This study is supported by Selcuk University Scientific Research Coordination (BAP)