Podcast
Questions and Answers
What is the purpose of using non-eugenol containing paste?
What is the purpose of using non-eugenol containing paste?
- To improve the impression detail
- To reduce irritation (correct)
- To accelerate the setting reaction
- To increase the thermal conductivity
What is the function of potassium sulfate in impression materials?
What is the function of potassium sulfate in impression materials?
- To reduce the thermal conductivity
- To improve the impression detail
- To increase the strength of the material
- To accelerate the setting reaction (correct)
Which impression material is commonly used for making primary casts?
Which impression material is commonly used for making primary casts?
- Thermoplastic material
- Zinc oxide pastes
- Impression plaster (correct)
- Impression compound
Why is it necessary to pour the impressions immediately?
Why is it necessary to pour the impressions immediately?
What type of impression material is used for border molding?
What type of impression material is used for border molding?
What is the characteristic of zinc oxide pastes?
What is the characteristic of zinc oxide pastes?
What is the main advantage of using β CaSO₄.½ H₂O over ᾁ-hemihydrate in impression plaster?
What is the main advantage of using β CaSO₄.½ H₂O over ᾁ-hemihydrate in impression plaster?
What is the purpose of using Zincoxide and Eugenol (ZnO/E) in impression materials?
What is the purpose of using Zincoxide and Eugenol (ZnO/E) in impression materials?
What is the composition of impression plaster?
What is the composition of impression plaster?
What is the primary use of impression plaster in dentistry?
What is the primary use of impression plaster in dentistry?
What is the setting time of impression plaster?
What is the setting time of impression plaster?
Why is a separating medium required when using impression plaster?
Why is a separating medium required when using impression plaster?
What is the dimensional stability of impression plaster?
What is the dimensional stability of impression plaster?
What type of tray is recommended for use with impression plaster?
What type of tray is recommended for use with impression plaster?
What is the main reason for the dry mouth sensation during impression taking?
What is the main reason for the dry mouth sensation during impression taking?
What is the characteristic of Type I Impression Compound?
What is the characteristic of Type I Impression Compound?
What is the purpose of adding a plasticizer to the impression compound?
What is the purpose of adding a plasticizer to the impression compound?
What is the primary role of inert oil in the Zinc Oxide Eugenol impression material?
What is the primary role of inert oil in the Zinc Oxide Eugenol impression material?
What is the essential component for the hydrolysis of Zinc Oxide to its hydroxide?
What is the essential component for the hydrolysis of Zinc Oxide to its hydroxide?
What happens to the impression compound when it is heated to 45-55°C?
What happens to the impression compound when it is heated to 45-55°C?
What is the result of the reaction between Zinc Oxide and Eugenol?
What is the result of the reaction between Zinc Oxide and Eugenol?
What is the purpose of kneading the impression compound outside the water bath?
What is the purpose of kneading the impression compound outside the water bath?
Why is it necessary to allow time for cooling during impression taking?
Why is it necessary to allow time for cooling during impression taking?
What is the effect of adding a drop of water to the Zinc Oxide Eugenol mixture?
What is the effect of adding a drop of water to the Zinc Oxide Eugenol mixture?
What is the characteristic of Type II Impression Compound?
What is the characteristic of Type II Impression Compound?
What is a disadvantage of impression compound?
What is a disadvantage of impression compound?
Why is Type II Impression Compound used as a tray material?
Why is Type II Impression Compound used as a tray material?
What is the characteristic of the Zinc Oxide Eugenol impression material that makes it suitable for edentulous patients?
What is the characteristic of the Zinc Oxide Eugenol impression material that makes it suitable for edentulous patients?
What is the purpose of applying Vaseline paste to the skin around the lips before taking an impression?
What is the purpose of applying Vaseline paste to the skin around the lips before taking an impression?
What is the characteristic of the Zinc Oxide Eugenol impression material that allows it to accurately register surface details?
What is the characteristic of the Zinc Oxide Eugenol impression material that allows it to accurately register surface details?
What is the advantage of using a cool glass slab for mixing the Zinc Oxide Eugenol pastes?
What is the advantage of using a cool glass slab for mixing the Zinc Oxide Eugenol pastes?
Why should impression compound be poured within one hour?
Why should impression compound be poured within one hour?
What is a use of zinc oxide eugenol impression material?
What is a use of zinc oxide eugenol impression material?
What is a component of zinc oxide eugenol impression material?
What is a component of zinc oxide eugenol impression material?
What is a component of the base paste in zinc oxide eugenol impression material?
What is a component of the base paste in zinc oxide eugenol impression material?
What is a use of sheets of impression compound?
What is a use of sheets of impression compound?
What is a characteristic of impression compound?
What is a characteristic of impression compound?
What is the purpose of the catalyst reactor paste in zinc oxide eugenol impression material?
What is the purpose of the catalyst reactor paste in zinc oxide eugenol impression material?
Flashcards
Zinc Oxide Pastes
Zinc Oxide Pastes
Impression material used to make impressions for edentulous patients, and in various dental procedures.
Edentulous patients
Edentulous patients
Patients missing teeth.
Surgical pack
Surgical pack
A temporary material used in periodontal treatments or surgeries.
Eugenol sensitivity
Eugenol sensitivity
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Chelation reaction
Chelation reaction
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Impression Plaster
Impression Plaster
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Impression Compound
Impression Compound
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Manipulation (ZnO Paste)
Manipulation (ZnO Paste)
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Setting time (ZnO Paste)
Setting time (ZnO Paste)
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Setting time (Impression Plaster)
Setting time (Impression Plaster)
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Dimensional stability
Dimensional stability
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Acrylic special tray
Acrylic special tray
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Separating medium
Separating medium
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Rigid material
Rigid material
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Undercut areas
Undercut areas
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Low viscosity
Low viscosity
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High flow
High flow
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Hydrophilic
Hydrophilic
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Tray Compound
Tray Compound
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Study Notes
Zinc Oxide Pastes
- Used for making impressions for edentulous patients
- Can be used as a surgical pack in periodontal treatments, temporary filling material, surgical pack in dental surgeries, insulating base in deep cavities, temporary relining of dentures, and root-canal filling material
- Can be used for occlusal bite registration
- Require a non-eugenol containing paste in case of eugenol sensitivity
- Where ZnO reacts with carboxylic acid instead of eugenol oil
Properties of Zinc Oxide Pastes
- Rigid material, cannot record undercut areas
- Adheres to acrylic tray material, no need for adhesive
- Adheres to skin around lips, requires Vaseline paste protection
- No separating medium required before pouring the cast material
- Sufficient flow, accurate registration of surface details
- Most dimensionally stable rigid impression material (less than 0.1% shrinkage on hardening)
Manipulation and Setting Reaction of Zinc Oxide Pastes
- Equal lengths of each paste mixed on a glass slab or oil-resistant paper pad
- Mixing time: 1 minute
- Factors controlling setting time: drop of water, high temperature and humidity, smaller particle size of Zinc-oxide powder, prolonged mixing of both pastes, drop of oil, and cool glass slab for mixing
- Setting reaction: chelation reaction
Impression Plaster
- Used to make secondary impressions for edentulous patients without bony undercut
- Powder mixed with water in a rubber bowl, low viscosity and high flow
- Hydrophilic, good adaptation to soft tissues, perfect recording of fine details
- Setting time: 5 minutes, rigid after setting, cannot record undercut areas
- Very good dimensional stability (0.06% change on setting)
- Should be used in acrylic special tray (1.5 spacer)
- Requires separating medium
Impression Compound
- Definition: rigid impression material that sets by a physical reaction, reversible, and thermoplastic
- Composition: natural resin and waxes, plasticizer, filler, and coloring agent
- Types: Type I (Low-fusing Impression Compound) and Type II (Tray Compound)
- Manipulation: sheets inserted in hot water bath, kneaded outside water bath to avoid leaching out of constituents
- Setting mechanism: physical process, reversible, changes its physical state by temperature change
- Properties: rigid impression material, muco-compressive, high viscosity and low flow, poor thermal conductivity, and poor dimensional stability
- Advantages: can be reused several times to correct mistakes and inaccuracies during impression taking
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