Learn About Your Oral Health. Delta Dental recently conducted the Preventive Dental Care Study, the largest claims study of its kind. We found that even among insured individuals, many people at higher risk for tooth decay or gum disease aren't getting proper preventive dental care. Are you or your family members at higher-risk?
- Straight photography-term used to describe picture making with minimal manipulation of the photograph ic process. -Stress marks-black lines on a photograph ic emulsion caused by friction or pressure.
Physics, Optics. 1  any of the lines or streams in which light appears to radiate from a luminous body. 2  the straight line normal to the wave front in the propagation of radiant energy.  a stream of material particles all moving in the same straight line.