46 chromosomes , about 20000 protein coding genes , thousands of mutations , giving human being all his physical & non-physical traits , including teeth (color , shape , alignment , thickness of enamel etc.) every tooth has its own DNA blueprint , concerning shade (hue , chroma , value ) it can be expressed and perceived differently apicocoronally & mesiodistally within the same tooth . Comprehensive shade mapping is a time-consuming process no single base shade can provide an adequate esthetic match , using universal single shade composite like Omnichroma to restore all teeth , all cavities seems to be disrespecting to this God made uniqueness , maybe the only advantage they offer is saving humanity time (the dentist & patient ).
First sight , discolored incisor with old monoshade composite restoration .
Old composite removed , RCT redone and internally bleached .
The perceived color of a tooth is actually a combination of inner and outer substrates (enamel and dentin ) each of them has its own intrinsic optical and physical properties which should be understood individually and collectively , Enamel is much likely a fiber optic layer that modulates the perception of the underlying dentin color , The degree of translucency/opacity of enamel can vary according to natural factors such as thickness, genetics, and age as well as operative induced factors such as tooth bleaching , Such variations can determine one’s perception of the underlying dentin color, thereby altering its chroma and value, Highly translucent enamel permits light to be transmitted through it to reach deeper , to the high-chroma dentin substrate and reflects most of its hue without much change in color saturation.
Finishing and polishing show the final face of the restoration where light-reflecting and light-deflecting zones intentionally created to mimic as possible the adjacent tooth reflective areas .
Every case has its own recipe , no two identical teeth exist so every case should be assessed and planned differently .
