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composite discolouration

 
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Pcus



Joined: 17 May 2005
Posts: 434
Location: toronto

PostPosted: Fri Oct 30, 2015 9:30 am    Post subject: composite discolouration Reply with quote

I got a sample of this Z nano composite material

Its kinda weird the A2 Opaque is a nice shade and the stuff polishes almost like a microfill when you take it out of the compule, its almost like an A 3.5 shade but when you cure it, it pops up to a perfect A2

however I have had two occasions when after applying and curing a few days later the colour changed back to the original darker shade that it was prior to curing

any idea how this could possibly happen
I am using Valo light so I am not undercuring
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john kanca



Joined: 14 May 2005
Posts: 6342

PostPosted: Wed Nov 11, 2015 6:30 pm    Post subject: Reply with quote

As resins polymerize, they typically darken as the photochemistry is consumed. I suspect that that is what is happening here, just over a prolonged period.
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