Podcast
Questions and Answers
What is the first elastomeric impression material introduced?
What is the first elastomeric impression material introduced?
What is the essential component of polysulfide?
What is the essential component of polysulfide?
Mercaptan
What oxidizing agent is used in polysulfide?
What oxidizing agent is used in polysulfide?
Lead Peroxide
Elastomers exhibit syneresis and imbibition.
Elastomers exhibit syneresis and imbibition.
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Which of the following is not a type of elastomer?
Which of the following is not a type of elastomer?
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The setting reaction of polysulfide produces __________ as a by-product.
The setting reaction of polysulfide produces __________ as a by-product.
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What is the working time for polysulfide materials?
What is the working time for polysulfide materials?
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What is the setting time for polysulfide materials?
What is the setting time for polysulfide materials?
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Which property describes elastomers?
Which property describes elastomers?
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What is the first elastomeric impression material introduced?
What is the first elastomeric impression material introduced?
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What are the three types of elastomers mentioned?
What are the three types of elastomers mentioned?
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Elastomers undergo syneresis and imbibition.
Elastomers undergo syneresis and imbibition.
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The setting time for Polysulfide is known as ________ Time.
The setting time for Polysulfide is known as ________ Time.
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What is the essential component of Polysulfide?
What is the essential component of Polysulfide?
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What is one disadvantage of Polysulfide?
What is one disadvantage of Polysulfide?
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What is the role of lead dioxide in Polysulfide?
What is the role of lead dioxide in Polysulfide?
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Rubber impression materials are hydrophobic.
Rubber impression materials are hydrophobic.
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The setting reaction of Polysulfide yields ________ as a by-product.
The setting reaction of Polysulfide yields ________ as a by-product.
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What is the working time for Polysulfide?
What is the working time for Polysulfide?
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What are the two roles of plasticizers in Polysulfide?
What are the two roles of plasticizers in Polysulfide?
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Study Notes
Elastomers in Dentistry
- Elastomers are synthetic polymer-based impression materials with elastic properties similar to natural rubber.
- Common types of elastomers include Polysulfide, Polyether, and Silicone (condensation and addition).
- Used for making impressions in dentistry, particularly for partial and complete edentulous cases.
Polysulfide Impression Material
- First elastomeric impression material introduced, made from polysulfide polymer (mercaptan).
- Polymerization time (curing time) defines the time needed for the material to harden.
- Setting conditions lead to a flexible and paste-like state.
Composition of Polysulfide
- Base: Polysulfide polymer (contains mercaptan) which is cross-linked via oxidizing agents.
- Catalyst: Typically lead dioxide, which acts as an accelerator and is brown in color.
- Fillers: Lithopone or titanium dioxide enhance strength and prevent stickiness.
- Plasticizers: Include oleic or stearic acid (retarders) and dibutyl phthalate to adjust viscosity and workability.
- Sulfur: Present at 0.5%, enhances the reaction during curing.
Setting Reaction
- Chemical reaction involves lead dioxide and polysulfide polymer, producing polysulfide and water as a by-product.
- Working time for the material is approximately 4-7 minutes, with a setting time of 7-10 minutes.
Characteristics of Polysulfide
- No syneresis or imbibition occurs, maintaining the integrity of impressions.
- Hydrophobic nature ensures no change to the dental model, although it leads to longer setting times than other impression materials.
Advantages and Disadvantages
- Advantages: Long working time allows for detail capture; good for fixed appliances capturing necessary landmarks.
- Disadvantages: Requires a custom tray for application and has a longer setting time.
Elastomers in Dentistry
- Elastomers are synthetic polymer-based impression materials with elastic properties similar to natural rubber.
- Common types of elastomers include Polysulfide, Polyether, and Silicone (condensation and addition).
- Used for making impressions in dentistry, particularly for partial and complete edentulous cases.
Polysulfide Impression Material
- First elastomeric impression material introduced, made from polysulfide polymer (mercaptan).
- Polymerization time (curing time) defines the time needed for the material to harden.
- Setting conditions lead to a flexible and paste-like state.
Composition of Polysulfide
- Base: Polysulfide polymer (contains mercaptan) which is cross-linked via oxidizing agents.
- Catalyst: Typically lead dioxide, which acts as an accelerator and is brown in color.
- Fillers: Lithopone or titanium dioxide enhance strength and prevent stickiness.
- Plasticizers: Include oleic or stearic acid (retarders) and dibutyl phthalate to adjust viscosity and workability.
- Sulfur: Present at 0.5%, enhances the reaction during curing.
Setting Reaction
- Chemical reaction involves lead dioxide and polysulfide polymer, producing polysulfide and water as a by-product.
- Working time for the material is approximately 4-7 minutes, with a setting time of 7-10 minutes.
Characteristics of Polysulfide
- No syneresis or imbibition occurs, maintaining the integrity of impressions.
- Hydrophobic nature ensures no change to the dental model, although it leads to longer setting times than other impression materials.
Advantages and Disadvantages
- Advantages: Long working time allows for detail capture; good for fixed appliances capturing necessary landmarks.
- Disadvantages: Requires a custom tray for application and has a longer setting time.
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Description
Explore the essential concepts of dental materials, focusing specifically on elastomers and hydrocolloids in the context of DMD-3L. This quiz will test your knowledge of polysulfide materials and their applications in dentistry.
