MODEL RELEASED. Dental treatment. Ultraviolet lamp tool being used by a dentist to set the cement being used for the implants in a patient's teeth. The blue light seen is used to guide the dentist's use of the lamp, as the ultraviolet light is not visible. A clamp is being used to hold open the patient's mouth. The ultraviolet light provides energy to break chemical bonds, causing the cement to set. Sometimes the technique is used for some types of dental filling materials.