- For resins that require the narrower spectrum.
- Complete post-curing — crucial for biocompatible materials.
- Consumable — replace at cracks or discolouration.
Some resins post-cure best without the shortest UV band, and then 360N2 is the right tray. Follow the material manufacturer's instructions — Keystone and Asiga recommend 280N2. Change the tray in good time either way: a discoloured tray lets through less light, and an incomplete post-cure leaves residual monomer in a construction that is going to sit in the mouth.