Title: 0879 - Effect of Glaze Layer on Colour Stabilty of Ceramic Restorations
VAISHNAVI RAJARAMAN (Presenter)
SAVEETHA DENTAL COLLEGE
SNEHA GADA, SAVEETHA DENTAL COLLEGE
ASHOK VELAYUDHAN, SAVEETHA DENTAL COLLEGE
Objectives: To evaluate effect of staining solutions on ceramic restorations and on glazed ceramic restorations.
Influence of operator controlled factors on color stability of ceramic materials.
Methods: 240 specimens(10×10×1mm) were fabricated in 6 groups:IPS e-max CAD HTA2/I 12 and CEREC CAD each A)Glazed B)Glazed ,roughened by bur C)Glazed, roughened by bur and reglazed. Further 4 subgroups, with staining solution- Distilled water[D],Turmeric [T]; coffee [C]; Black tea [BT]). Specimens were immersed for 8 months ,washed in distilled water, dried with filter paper. The color determination was carried out using spectrometer (Easyshade V, Vita) and CIELab color system. Two-way analysis of variance (ANOVA) was used for analysis of DE (SPSS Statistics v20.0; IBM Corp),and Bonferroni method was used for pair-wise comparisons (a=.05 for all tests). Power analysis concerning differences in DE was performed using software (G*Power v3.1;Heinrich-HeineUniversität Düsseldorf).
Results: Post-hoc power analysis showed that immersion media and material type had significant effect on DE color value (P < 0.0001). One-way ANOVA also indicated that immersion media had significant effect on DE values(P < 0.0001).According to the ANOVA results, porcelain materials, surface polishing procedures, and their interactions were statistically significant (P < 0.05).For IPS Emax porcelain material groups, lowest color difference (DE) value was observed in group of black tea which significantly differed from other groups (P Z 1.000). The highest DE values in IPS Emax groups was observed where ceramic was glazed, trimmed and polished, in turmeric group (4.43), black coffee (4.37), black tea (4.22), which did not significantly differ from each other (P Z 0.435).
Conclusions: Significant differences were found in color change of ceramics with glazing and polishing techniques evaluated at 1 year(P < 0.05). IPS Emax porcelain materials tested were found to be more color-stable than CEREC porcelain. Largest color difference was observed with CEREC porcelain material. Glazed specimens demonstrated less color change than polished specimens for all porcelain materials tested. Glazed and reglazed ceramics showed DE values at an acceptable level for all porcelain materials.
|CERAMIC (TREATMENT DONE )||DISTILLED WATER||TURMERIC||BLACK COFFEE||BLACK TEA|
|GLAZED, TRIMMED , REGLAZED||3.22||4.43||4.37||4.22|
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE