Spectrophotometric Analysis of Color Stability of Omnichroma Composite and Multi-Shade Composite Material Under The Effect Of Chlorhexidine in the Presence and Absence of Anti-Discoloration System –an in-Vitro Study

Abstract

Introduction: Omnichroma, a single-shade composite is commonly used for aesthetic restorations due to its notable color-matching properties. However, studies have indicated that some modern universal composite resins may exhibit suboptimal color stability.

Aim: The aim of the study was to assess the colour stability of single shade omnichroma and multi-shade composite restorative materials.

Methods and Material: 40 specimens of dimension 7*7mm were prepared. 20 specimen of Omnichroma (Tokuyama) and 20 specimens of Tetric n ceram (Ivoclar,vivadent) were prepared using composite filling instrument.Each group was further subdivided into 2 subgroups. 1 subgroup from each group was exposed to CHX with an ADS while the other subgroup was exposed to CHX without ADS. Specimens were then cured for 20 seconds with light curing unit and were polished with composite polishing disks. Color values of the prepared samples were recorded. All the samples were then subjected to mouthrinses. Post immersion sample’s color values were noted with the similar spectrophotometer. Statistical analysis: Paired and unpaired t test were used to statistically analyse the data.

Results:  For the single-shade samples, there was no statistically significant difference in light reflectance values between the baseline and after exposure to mouthrinses. In contrast, the multi-shade samples showed a statistically significant difference in light reflectance values between the baseline and post-exposure to mouthrinses when treated with both CHX with ADS and CHX without ADS.

Conclusions: Based on the findings of this study, although both composites exhibited discoloration, Omnichroma demonstrated superior color stability compared to Tetric N-Ceram Ivoclar.