All Free Dental Materials MCQs with Answers
Every Dental Materials question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
563 questions · page 29 of 29
- A. 65% silver, 32% tin and 3% copper
- B. 49% silver, 32% tin and 19% cooper
- C. 65% silver, 29% tin and 5-6% copper
- D. None of the above
Explanation: The traditional ADA composition limits are approximately 65% silver, 29% tin and 5 to 6% copper, with small permissible variations.
Correct answer: 65% silver, 29% tin and 5-6% copper- A. In the deepest part of the restoration
- B. In the centre of the restoration
- C. At the margin of the restoration
- D. None of the above
Explanation: Mercury concentration tends to be greatest near the margins, where condensation and adaptation can leave a more mercury-rich matrix.
Correct answer: At the margin of the restoration- A. Mixing of amalgam alloy and mercury
- B. Lysing amalgam alloy
- C. Removal of excess of mercury
- D. None of the above
Explanation: Trituration is the mechanical mixing of amalgam alloy powder with mercury to produce a uniform amalgam mass.
Correct answer: Mixing of amalgam alloy and mercury