National Dental Examining Board of Canada (NDEB) Practice Exam

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Master your National Dental Examining Board of Canada (NDEB) exams with our comprehensive practice guide. Achieve excellence in your dental certification with expertly crafted questions and detailed explanations.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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Doubling the diameter of a round SS orthodontic wire decreases its springiness by how many times?

The correct answer is: 8

When the diameter of a round SS orthodontic wire is doubled, its cross-sectional area is quadrupled, which means that the wire is now four times stiffer. This decrease in flexibility reduces its springiness by 8 times, making option D the correct answer. Option A, 2 times, is incorrect as doubling the diameter does not have a linear effect on the stiffness and springiness of the wire. Option B and C, which suggest a decrease by 4 or 6 times, are also incorrect as they do not accurately reflect the increase in stiffness and decrease in springiness that occurs when the diameter is doubled. Option D is the best and most accurate choice.