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Final Impression in FPD: Conventional vs Digital

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Final Impression in FPD: Conventional vs Digital

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Questions and Answers

What is a key characteristic of hydrophobic impression materials?

High affinity for moisture
Low contact angle
Strict moisture control (correct)
Excellent surface wetting

Why is tear resistance important for impression materials?

To resist tearing during removal from the mouth (correct)
To improve accuracy of the details
To reduce dimensional stability
To increase surface wetting

What is critical for accurate replication of intraoral structures?

Strict moisture control
Dimensional stability (correct)
Poor surface wetting
High contact angle

Which factor may lead to dimensional changes in impression materials?

Absorption of moisture from the environment (D) Signup and view all the answers

Why is accurate reproduction of details essential for impression materials?

To have an exact negative imprint of teeth (C) Signup and view all the answers

What is the main purpose of an impression in crown and bridge prosthodontics?

To provide a negative likeness of the form and relationship of teeth and oral tissues (A) Signup and view all the answers

Why is it essential for an impression to include enough uncut tooth surface beyond the preparation?

To ensure accurate reproduction and location of the finish line (A) Signup and view all the answers

What role does the hydrophilicity of impression material play in final impressions for crowns and bridges?

It enhances surface detail reproduction due to good wetting properties (A) Signup and view all the answers

Why should an impression be bubble free according to the text?

To prevent distortion and fracture during removal from undercut regions (B) Signup and view all the answers

What is meant by the requirement for an impression to be elastic after placement in the mouth?

The impression must allow for withdrawal from undercut regions without distortion (C) Signup and view all the answers

Why is it crucial for an impression to accurately reproduce adjacent teeth and tissues?

To allow proper contouring of the restoration (C) Signup and view all the answers