In dental radiography, a blurred image is most likely caused by which factor?

• A. Patient moved
• B. Overdeveloped
• C. Dark film
• D. Blank film

Answer: (A)

Motion during exposure is what creates a blurred dental radiograph. If the patient moves while the x-ray beam is captured, the shadows from teeth and surrounding structures smear across the film, so edges lose sharpness and fine details become unclear. This smearing is the hallmark of blur and directly affects diagnostic readability. Other issues, like overdevelopment or a film that’s too dark, change overall density or create a uniformly dark image rather than producing a smeared, indistinct outline. Prevent blur by stabilizing the patient with proper support, using bite blocks, giving clear instructions, and opting for shorter exposure times or faster sensors to minimize movement.