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DHA Dental Technician (DHA-DT) Practice Tests & Test Prep by Exam Edge - Topics



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Understanding what is on the DHA Dental Technician exam is crucial step in preparing for the exam. You will need to have an understanding of the testing domain (topics covered) to be sure you are studying the correct information.

  • Directs your study efforts toward the most relevant areas.
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  • Keeps you informed about your field's current demands and standards.
There is no doubt that this is a strategic step in achieving certification and advancing your career.

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DHA Dental Technician Exam Blueprint

DHA Dental Technician - Exam Topics Sample Questions

Which of the following is used to control chemical agents from developing unexposed silver halide crystals?

Correct Answer:
potassium bromide. 


in the photographic development process, particularly in black and white photography, the control of chemical reactions is crucial to achieving the desired image quality. one of the key components used in this process is potassium bromide. it serves a specific and important role in the development of photographic films and papers.

photographic films are coated with an emulsion layer that contains silver halide crystals. these crystals are sensitive to light; when exposed to light, they undergo a chemical change. however, not all crystals are exposed to light. during the development process, it is essential to ensure that only those silver halide crystals which have been exposed to light are developed (i.e., reduced to black metallic silver), while those that have not been exposed remain unaffected and are later removed from the film.

potassium bromide is used in the developer solution as a restrainer or an antifoggant. its primary role is to prevent the development of the unexposed silver halide crystals. without such a restrainer, the developing agents in the solution might reduce all the silver halide crystals, both exposed and unexposed, leading to a fogged or overly dense image. this fogging is undesirable as it reduces the contrast and clarity of the final photographic image.

the way potassium bromide works is by competing with the developing agents for the unexposed silver halide crystals. it effectively inhibits or slows down the reduction process of these unexposed crystals without affecting the already exposed crystals that are undergoing development. this selective action helps maintain the integrity of the image being developed, ensuring that only the desired parts of the image are highlighted.

in summary, potassium bromide is crucial in the photographic development process for its ability to control and restrain the development of unexposed silver halide crystals. this ensures that the final image maintains high quality with clear distinctions between the light-exposed and unexposed areas, essential for producing accurate and visually pleasing black and white photographs.