EFDA Ch 46 Impression Materials Exam Questions & Answers (Grade A+).docx

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EFDA Ch 46 Impression Materials Exam Questions & Answers (Grade A+).docx

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EFDA Ch 46 Impression Materials Exam Questions & Answers (Grade A+).docx

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EFDA Ch 46 Impression Materials
Exam Questions & Answers (Grade
A+)
Is an impression a negative or a positive reproduction? -
correct answer ✅negative

Of the three classifications of impressions, which can the EFDA
legally take? -
correct answer ✅The EFDA can legally take preliminary
impressions and bite registrations.

Which of the three classifications of impressions is used for occlusal
relationships? -
correct answer ✅The bite registration is used for occlusal
relationships.

Which type of impression tray covers half the arch? -
correct answer ✅A quadrant tray

Which type of tray allows impression material to lock on
mechanically? -
correct answer ✅A perforated tray

, EFDA Ch 46 Impression Materials
Exam Questions & Answers (Grade
A+)
Which type of tray is designed to fit a specific patient? -
correct answer ✅A custom tray

What is used to extend the length of a tray? -
correct answer ✅Utility wax

What is the most widely used irreversible hydrocolloid for
preliminary impressions? -
correct answer ✅alginate

What is the organic substance within hydrocolloid materials? -
correct answer ✅alginate, which is derived from seaweed

Why would you select a fast-set alginate over a normal-set
alginate? -
correct answer ✅if the patient had a strong gag reflex

What is the water-to-powder ratio for taking a maxillary
impression? -
correct answer ✅three scoops of powder to three

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Uploaded on: August 11, 2026
Number of pages: 5
Written in: 2026/2027
Type: Exam (elaborations)
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