"Dental X-Rays" "Dental X-Rays" http://www.physics.isu.edu/radinf/dental.htm "Dental X-Rays" "Dental X-Rays" "Dental X-Rays" "Dental X-Rays" "Dental X-Rays" "Dental X-Rays" "Dental X-Rays" outweigh outweigh "Dental X-Rays" "Dental X-Rays" "Dental X-Rays" "Dental X-Rays"