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What is Cervident is an example of which generation bonding agent? and explain in detail?
FIRST – Contains NPG GMA-N phenyl glycine glycidyl meth acrylate. 
Mechanism of bonding is by chelating with calcium.

Eg cervident ,cosmic bond. 

Disadvantage; poor bond strength 1-3 MPA. 
Hydrolysis of bond in oral environment and poor clinical results.