NUVA SEAL is:
First Generation Sealants:

Polymerized with UV light at a wavelength of 365 nm – cyanoacrylate based material.
Classified as ‘accepted’ by ADA in 1976.
Eg: Alpha seal, Nuva Seal

Failed due to:

Excessively absorbed UV light-prevented complete polymerization of sealant at its depth.
Inconsistency of wavelength from the UV light source.
The potential for retinal damaged with long term exposure to UV light.
UV activated sealant
Self-cure sealant
Light cure sealant
Flouride releasing sealant