Nauman Ahmed Noor, Aneela Qaisar, Saima Shafiq, Najeeb Ullah, Sanam Ayesha, Kinza Zafar, Maria Asmat, Nazia Yazdanie.
Spectrophotometric Analysis of Color Stability of Three Different Restorative Materials.
J Sharif Med Dent Coll Jan ;6(2):77-82.

Objective: To compare in vitro the color stability of three different restorative materials by spectrophotometric analysis at time intervals of 24 hours, 1 week, 2 weeks, and 4 weeks after exposure to cola drink and tea. Methodology: This in-vitro experimental study was conducted in the Applied Chemistry Research Center at PCSIR laboratory after ethical approval from Institutional Review Board (IRB) of FMH College of Dentistry Lahore. Three different restorative materials [(Biodentine TM, Resin-Modified Glass Ionomer Cement (RMGIC), and Glass Ionomer Cement (GIC)] were evaluated for color stability. Eighteen disc-shaped specimens (20x2 mm) were prepared using an acrylic ring mould. Color coordinates (L*a*b*,4L*, 4a*,46*, and AE*) were measured using a spectrophotometer. All the fabricated specimens were subdivided into two groups; A and B (n=9 each) and immersed in distilled water for 24 hours for baseline color evaluation. Thereafter, the specimens of group A and B were immersed in two different beverages i.e. cola drink (n=9) and tea (n=9), respectively. The restorative materials were evaluated at intervals of 1 week, 2 weeks, and 4 weeks of storage. These specimens were subjected to pH cycling by immersion in demineralizing and remineralizing solution and immersed in cola drink and tea for 30 minutes for the entire duration of the study. Data was analyzed using Statistical Package for the Social Sciences (SPSS) version 20. The color changes (SE) were calculated and analyzed by Friedman's test to identify the significant group at a 5% confidence level. Results: At 24 hours interval, the 4E of all the restorative materials was statistically insignificant. The statistical analysis depicted that the AE of group B (tea) was significantly lesser than that observed with group A (cola drink) for Biodentine TM and RMGIC. On the contrary, 4E of group A (cola drink) was observed to be lesser for GIC in comparison to group B (tea). The color change gradually decreased over the period of 4 weeks in both groups for all the restorative materials, Conclusions: Mean color change after 4 weeks of immersion in cola drink and tea was most significant for Biodentine TM in comparison to RMGIC and GIC. However, RMGIC depicted better mean color stability than other restorative materials. Keywords: Color Stability. Spectrophotometer. Biodentine'. Glass Ionomer Cement (GIC). Resin-Modified Glass Ionomer Cement (RMGIC).

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