eli5: How does dental filling become hard under UV light?
In: 17
The chemicals inside it enter a reaction, which results in new material that is solid. Much like when you take a glowstick and “activate” it (by breaking glass vial inside and mixing two liquids), the chemical reaction causes it to start glowing.
UV reactive materials can be found in many parts of our world. UV reactive resin, for example, is used in construction or (more recently) 3D printing.
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