Khurram Parvez Sardar, Syed Yawar Ali Abidi, Nadeem Hafeez Khokhar, Noor-ul ain Jawaed.
Comparison of Colour Stability of Two Composite Resins After Immersion in Coffee Solution.
J Pak Dent Assoc Jan ;22(1):27-32.

OBJECTIVE: Discoloration is one of the main reasons of replacement of anterior composite restorations. The aim of this in-vitro study was to evaluate the colour stability of two composite resins after being immersed in a coffee solution. METHODOLOGY: One hundred and twenty discs samples (10 mm in diameter & 2mm thickness) were prepared and divided into two groups according to restorative material used. For group 1 (n=60) Filtek Z350 nanocomposite was used and Spectrum TPH sub-micron hybrid was used for Group 2 (n=60). All discs were polymerized by a LED light-curing unit according to manufacturer’s instructions. All discs were initially placed in an incubator containing distilled water at 37°C for 24 hours. After 24 hours baseline colorimetric evaluation of specimens was measured with a SF 600 Datacolor Spectrophotometer using CIE L*a*b* system. All the samples in the two groups were immersed in a coffee solution for 7 days in incubator at 37°C. On the 8th day, post immersion colorimetric reading were taken and color change ( E) was measured. SPSS. 16.0 was used for statistical analysis. Descriptive statistics were shown as Mean ±SD. Student ‘t’ test was applied at a significance level of p=0.05. RESULTS: Post immersion discoloration of FiltekTM Z350 ( E=2.78(±0.72) was significantly greater (p<0.001) than spectrum TPH3 ( E=1.96(±0.79). Between the solutions tested, the dis-coloration caused by coffee ( E=2.3(±0.85) was greater (p<0.001) than distilled water ( E=1.0(±0.51). CONCLUSION: One week immersion in coffee resulted in significant discoloration in Filtek Z350 Nano-composite restorative material.

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