Questions and Answers
What is the purpose of an impression material in dentistry?
To obtain a negative reproduction of the oral tissues
Which requirement for an ideal impression material focuses on the ability to maintain recorded fine details?
Stability
What is the term used for the positive reproduction obtained by pouring plaster or stone into the impression?
Model
Which property is NOT listed as a requirement for an ideal impression material?
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What is the main difference between a model and a die in dentistry?
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Which term describes the ability of an impression material to not permanently deform during removal from undercut areas of the mouth?
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What is the main purpose of impression materials in dentistry?
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Which requirement for an ideal impression material focuses on its ability to be disinfected without affecting accuracy or stability?
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What property is crucial in impression materials to prevent tearing or permanent deformation during removal from undercut areas of the mouth?
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Which term describes the ability of an impression material to reproduce all fine details accurately?
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In dentistry, what is the positive reproduction called that is obtained by pouring mixed plaster or stone into an impression?
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Which aspect is vital in impression materials to allow enough time for pouring plaster or stone before hardening?
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What is the main purpose of pouring mixed plaster or stone into an impression in dentistry?
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Which requirement for an ideal impression material focuses on its shelf life in the dental office?
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In dentistry, what is the ability of an impression material to maintain recorded fine details known as?
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What important aspect ensures that an impression material does not permanently deform during removal from undercut areas of the mouth?
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Which property is crucial for an ideal impression material to accurately record fine details?
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What is the primary role of impression materials in dentistry?
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What property of an ideal impression material ensures that it is acceptable to the patient?
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Which requirement for an ideal impression material focuses on its dimensional stability?
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In dentistry, what is the primary purpose of obtaining a positive reproduction from an impression?
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Which aspect of impression materials is crucial to ensure they do not tear during removal from undercut areas?
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What is the ability of an ideal impression material to record fine details accurately known as?
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Which requirement for an ideal impression material focuses on its ease of manipulation and cost-effectiveness?
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What term is used to describe the ability of an impression material to prevent tearing or permanent deformation during removal from undercut areas of the mouth?
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Which attribute of an ideal impression material focuses on its ability to maintain the recorded fine details?
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In impression materials, what is the term used to describe the ability to record all fine details accurately?
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Which requirement for an ideal impression material focuses on its compatibility with die and model materials?
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What is the main purpose of allowing sufficient setting time for an impression material before pouring plaster or stone?
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Which property of an ideal impression material ensures that it is safe for use and does not cause irritation?
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What is the primary purpose of pouring mixed plaster or stone into an impression in dentistry?
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Which requirement for an ideal impression material focuses on its compatibility with die and model materials?
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Which property is crucial for an ideal impression material to accurately record fine details?
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What term is used in dentistry to describe the positive reproduction obtained by pouring mixed plaster or stone into an impression?
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Which aspect is vital in impression materials to allow enough time for pouring plaster or stone before hardening?
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What is the most crucial requirement for an ideal impression material in terms of ensuring it does not tear or permanently deform during removal from undercut areas of the mouth?
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What is the term used in dentistry for the positive reproduction obtained by pouring mixed plaster or stone into an impression?
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Which property is crucial for an ideal impression material to accurately record fine details?
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What is the primary purpose of pouring mixed plaster or stone into an impression in dentistry?
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Which requirement for an ideal impression material focuses on its compatibility with die and model materials?
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What important aspect ensures that an impression material does not permanently deform during removal from undercut areas of the mouth?
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In dentistry, what is the ability of an ideal impression material to record fine details accurately known as?
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What term is used to describe the positive reproduction obtained by pouring mixed plaster or stone into an impression in dentistry?
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Which requirement for an ideal impression material focuses on its dimensional stability?
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What is the term used for the ability of an impression material to not permanently deform during removal from undercut areas of the mouth?
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Which property is crucial for an ideal impression material to accurately record fine details?
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In dentistry, what is the primary role of obtaining a positive reproduction from an impression?
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Which requirement for an ideal impression material focuses on its compatibility with die and model materials?
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What is the most crucial requirement for an ideal impression material in terms of ensuring it is safe for use and does not cause irritation?
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Which aspect is essential in impression materials to allow enough time for pouring plaster or stone before hardening?
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Which requirement for an ideal impression material ensures that it is easy to manipulate and inexpensive?
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In dentistry, what is the term used for the positive reproduction obtained by pouring mixed plaster or stone into an impression?
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Study Notes
Impression Materials
- Impression materials are used to record accurately the shape and dimensions of oral tissues.
- A mixed material in the soft state is placed against oral tissues to set, giving a negative reproduction of the oral tissues.
- A positive reproduction is obtained by pouring mixed plaster or stone into the impression, which is called a model when large areas of oral tissue are involved or a die when a single tooth is prepared.
Requirements for 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 tear or permanently deform during removal from undercut areas)
- Dimensionally stable to allow enough time to pour plaster or stone
- Compatible with die and model materials (no need for separating medium)
- Long shelf life (no deterioration in the dental office)
- Easy to manipulate and inexpensive
- Disinfected without affecting accuracy or stability
Key Requirements
- Accuracy: the ability to record fine details
- Stability: the ability to maintain the recorded fine details
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