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
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
