Podcast
Questions and Answers
What are the key properties of ideal impression materials used in Fixed Prosthodontics?
What are the key properties of ideal impression materials used in Fixed Prosthodontics?
- High cost, easy availability, and quick setting time
- Dimensional stability, tear resistance, and ability to reproduce fine details (correct)
- Color variety, tastelessness, and high viscosity
- Low cost, flexibility, and easy disinfection
Why is it important to add perforations to custom trays for dentate patients?
Why is it important to add perforations to custom trays for dentate patients?
- To increase the rigidity of the tray
- To reduce the weight of the tray
- To help in mechanical retention of impression material (correct)
- To improve the aesthetics of the tray
What are the learning objectives related to impression materials in Fixed Prosthodontics?
What are the learning objectives related to impression materials in Fixed Prosthodontics?
- Classify impression materials, identify the features of ideal and unacceptable impressions, compare different types of impression trays, list disinfection methods, identify impression techniques, and explain properties of ideal impression materials. (correct)
- Discuss the cost of impression materials, compare impression materials with orthodontic materials, and list the side effects of impression materials.
- List the names of impression materials, explain the history of impression materials, and discuss the future of impression materials.
- Compare impression materials with restorative materials, identify the color of impression materials, and explain the manufacturing process of impression materials.
What are the key terms related to impression materials in Fixed Prosthodontics?
What are the key terms related to impression materials in Fixed Prosthodontics?
What are the specifications of a custom tray for dentate patients?
What are the specifications of a custom tray for dentate patients?
What are the advantages of elastomeric impression materials?
What are the advantages of elastomeric impression materials?
Which characteristic of ideal impression material is related to the material's ability to flow without slumping?
Which characteristic of ideal impression material is related to the material's ability to flow without slumping?
What is the primary purpose of using two different materials with different viscosities in full coverage restorations?
What is the primary purpose of using two different materials with different viscosities in full coverage restorations?
Which characteristic is NOT considered an ideal impression material characteristic?
Which characteristic is NOT considered an ideal impression material characteristic?
What is the primary purpose of measuring wettability in impression materials?
What is the primary purpose of measuring wettability in impression materials?
Which characteristic is critical for addressing troubleshooting in impression making?
Which characteristic is critical for addressing troubleshooting in impression making?
What is the purpose of using hydrophilic impression materials despite their requirement for good moisture control?
What is the purpose of using hydrophilic impression materials despite their requirement for good moisture control?
What is the purpose of a stopper and wax spacer in dental impression techniques?
What is the purpose of a stopper and wax spacer in dental impression techniques?
Why are custom trays preferred over stock trays for multiple teeth restoration?
Why are custom trays preferred over stock trays for multiple teeth restoration?
What is the advantage of using custom metal trays for dental impressions?
What is the advantage of using custom metal trays for dental impressions?
Why is tray adhesive added to the impression tray?
Why is tray adhesive added to the impression tray?
What is the purpose of capturing preparation stress with a spacer in the impression material?
What is the purpose of capturing preparation stress with a spacer in the impression material?
What is the significance of pouring elastomeric impression materials within 30 minutes of setting?
What is the significance of pouring elastomeric impression materials within 30 minutes of setting?
Which impression material undergoes cationic polymerization with no by-product formation?
Which impression material undergoes cationic polymerization with no by-product formation?
What is the main disadvantage of using latex gloves when mixing PVS putties?
What is the main disadvantage of using latex gloves when mixing PVS putties?
What is the main advantage of polyether over addition silicone?
What is the main advantage of polyether over addition silicone?
What is the main reason for difficulties in removal from undercut areas when using addition silicones?
What is the main reason for difficulties in removal from undercut areas when using addition silicones?
What type of gloves should be used to avoid contamination when handling condensation silicones?
What type of gloves should be used to avoid contamination when handling condensation silicones?
What is the shelf life of condensation silicones?
What is the shelf life of condensation silicones?
What is the working time for addition silicone (PVS) impression materials?
What is the working time for addition silicone (PVS) impression materials?
What is the setting time for polysulfide impression materials?
What is the setting time for polysulfide impression materials?
What is the required detail reproduction level for putty impression materials?
What is the required detail reproduction level for putty impression materials?
What is the nature of surfactants added to hydrophobic silicones in dental impression materials?
What is the nature of surfactants added to hydrophobic silicones in dental impression materials?
What is the nature of die stones in reproducing detail in dental impressions?
What is the nature of die stones in reproducing detail in dental impressions?
What is the shelf-life limitation of condensation silicone impression materials?
What is the shelf-life limitation of condensation silicone impression materials?
Study Notes
Dental Impression Materials Overview
- Dental impression materials capture details with low viscosity and must be removed from the patient's mouth without distortion
- Surfactants are added to hydrophobic silicones to combat their nature and improve wettability
- Elastomeric impression materials are required to record detail down to 20 microns
- Die stones are required to reproduce detail down to 50 microns
- Putty captures details down to 75 microns
- Working time for elastomeric impression materials is approximately 2 minutes, and setting time is 2-6 minutes
- Elastomeric impression materials have three types of viscosity: low, medium, and heavy
- Polysulfide materials have a thixotropic property and are supplied as two pastes: base and catalyst
- Polysulfide materials have a working time of 5-7 minutes and a setting time of 8-14 minutes
- Condensation silicone undergoes a condensation reaction that produces ethyl alcohol as a by-product, causing high shrinkage
- Addition silicone, also known as polyvinylsiloxanes (PVS), have a working time of 5 minutes and a setting time of 10-12 minutes
- Shelf-life of condensation silicone is limited due to its sensitivity to heat and moisture
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Description
Test your knowledge of dental impression materials with this overview quiz. Explore topics such as elastomeric materials, die stones, putty, polysulfide materials, condensation silicone, and addition silicone. Gain insight into working time, setting time, viscosity, and other essential characteristics of these materials.
