40 Questions
What is the primary purpose of impression materials?
To record accurately the shape and dimensions of oral tissues
What is obtained by pouring mixed plaster or stone into the impression?
A positive reproduction of oral tissues
What is the term for a positive reproduction of oral tissues involving a single tooth?
Die
What is a critical requirement for an ideal impression material?
Accuracy and stability
What is the ability to record fine details?
Accuracy
What is a requirement for an ideal impression material during removal from undercut areas?
Not to tear or permanently deform
Impression materials should be what to ensure patient acceptance?
Safe, with good odor, color, and taste
Why is it important for impression materials to be dimensionally stable?
To allow at least enough time to pour the plaster or stone
What is NOT a requirement for an ideal impression material?
Toxicity
What is the purpose of impression materials in dentistry?
To record accurately the shape and dimensions of oral tissues
What must be compatible with die and model materials?
Impression materials
Which material is poured into the impression to obtain a positive reproduction of the oral tissues?
Mixed plaster or stone
What is the term used for a positive reproduction when large areas of oral tissue are involved?
Model
What is the main factor that determines the quality of an ideal impression material?
Accuracy
Why is it important for impression materials to be safe and acceptable to the patient?
To prevent allergic reactions in patients
Which requirement ensures that an impression material is easy to remove from undercut areas of the mouth?
Mechanical properties
What role does stability play in the usefulness of impression materials?
It helps maintain recorded fine details
Which property of an ideal impression material allows for accurate reproduction of fine details?
Dimensional stability
Why is the compatibility with die and model materials important for impression materials?
To avoid the need for a separating medium
What is the most important requirement for an ideal impression material according to the text?
Stability
What is the purpose of pouring mixed plaster or stone into an impression?
To obtain a positive reproduction
Why is it crucial for impression materials to be dimensionally stable?
To ensure accurate reproduction of fine details
Which factor is critical for ensuring patient acceptance of impression materials?
Color
What is the term for the positive reproduction obtained when only a single tooth is involved?
Die
Which property of an ideal impression material ensures it can be easily removed from undercut areas of the mouth?
Sufficient mechanical properties
Why should impression materials be easy to manipulate and inexpensive?
For cost-effectiveness
Which requirement ensures that an impression material does not require a separating medium that would obscure fine details?
Compatibility with die and model materials
What is the most critical quality that an ideal impression material should possess?
Dimensional stability
Which property of an ideal impression material allows it to record fine details effectively?
Sufficient fluidity
Why must impression materials be safe and free from irritation?
To ensure patient acceptance
What is the main purpose of impression materials in dentistry?
To record oral tissue shape and dimensions
What is obtained by pouring mixed plaster or stone into the impression?
A positive reproduction of the oral tissues
What is the term used for a positive reproduction when large areas of oral tissue are involved?
Model
Which of the following is NOT a requirement for an ideal impression material?
Must be radioactive
What is the most important requirement for an ideal impression material?
Accuracy and stability
What is the purpose of impression materials in making a cast?
To record accurately the shape and dimensions of the oral tissues
Which of the following is a critical requirement for an ideal impression material?
Compatibility with die and model materials
What is the term used for a positive reproduction when only a single tooth is involved?
Die
What mechanical properties are required for an ideal impression material to have?
Not to tear or permanently deform during removal from undercut areas of the mouth
What is the role of stability in the usefulness of impression materials?
It maintains the recorded fine details
Study Notes
Impression Materials
- Used to record accurately the shape and dimensions of the oral tissues.
- A mixed material in the soft state is placed against the oral tissues to set.
- After setting, the impression gives a negative reproduction of the oral tissues.
Requirements for an Ideal Impression Material
- Safe (not toxic or irritant).
- Acceptable to the patient (good odor, color, and taste).
- Sufficiently fluid to reproduce all fine details.
- Suitable setting time.
- Sufficient mechanical properties (not to tear or permanently deform during removal from the undercut areas of the mouth).
- Dimensionally stable to allow at least enough time to pour the plaster or stone.
- Compatible with die and model materials (no need for a separating medium that obliterates the recorded fine details).
- Long shelf life (no deterioration in the dental office).
- Easy to manipulate and inexpensive.
- Disinfected without affecting its accuracy or stability.
Key Requirements
- Accuracy: the ability to record fine details.
- Stability: the ability to maintain the recorded fine details.
Learn about the materials used to accurately record the shape and dimensions of oral tissues in dentistry. Understand the process of creating negative impressions and positive reproductions for dental models.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
