الفهرس 
Shade Matching Of Omnichroma (One Shade Universal Composite) Versus A Microhybrid Composite In Class V Restorations : A Randomized Clinical Trial
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Abstract
Aim: The aim of this study is to evaluate the shade matching ability of a new single shade universal
microhybrid composite Omnichroma (Tokuyama Dental, Tokyo, Japan) compared to a conventional
multiple shade microhybrid composite in the restoration of class V restorations using USPHS criteria
and image analysis.
Methods and Materials: In two parallel groups (n= 38 restorations), 38 participants with class V
anterior carious lesions were enrolled in this study and randomly allocated. The intervention group
received Omnichroma single shade universal composite (Tokuyama Dental, Tokyo, Japan) and the
control group received a universal microhybrid multiple shade composite, 3M Z250(3M ESPE, St.
Paul, USA). Shade selection was carried out preoperatively. All cavities and restorations were done
under rubber dam isolation. Shade matching was evaluated visually by 1 blinded assessor using
Modified USPHS criteria. Calibrated photography was used to record CIELAB color coordinates and
calculate color difference using △E formula. Visual and instrumental evaluation were done at baseline
(1 week), after 3 months, and after 6 months.
Results: There was no statistically significant difference between the tested materials in shade
matching both visually using Modified USPHS criteria and instrumentally using calibrated
photography.
Conclusions: Within the limitations of this study, it could be concluded that using a single shade
composite with a structural coloring concept could be promising in the future of esthetic dentistry.
Also, eliminating the shade matching procedure could eliminate the errors in shade selection
providing a more predictable esthetic outcome, simplify the restorative procedures and save clinical
chairside time. Calibrated photography can be a useful and reliable tool for shade evaluation,
matching and analysis