Which device is used to cure or harden resin and some sealants?

The device used to cure or harden resin and some sealants is a curing light. This instrument emits a specific wavelength of light, typically in the blue spectrum, which activates photo-initiators in light-curable dental materials. When the resin or sealant is exposed to this light, a chemical reaction occurs that transforms the material from a soft, malleable state into a hard, durable structure. This process is critical in various dental procedures to ensure proper bonding and strength of materials used in fillings, sealants, and other restorative applications.

Micro brushes, on the other hand, are used for applying or dispensing dental materials or agents but do not serve to cure or harden them. A matrix retainer is employed to hold a matrix band in place during restorative procedures and is not associated with curing materials. A shade guide is utilized to match the color of restorative materials to the natural teeth but does not involve the curing process. Therefore, the curing light is the essential device for hardening resins and sealants in dental practice.