Podcast
Questions and Answers
What is the primary purpose of using a light consistency impression material?
What is the primary purpose of using a light consistency impression material?
- To inject over the prepared teeth and remaining dental arch (correct)
- To act as a catalyst for the base material
- To provide a heavy consistency for the final impression
- To use as a tray material for seating the final impression
What is the main advantage of polysulfide impression materials?
What is the main advantage of polysulfide impression materials?
- Long working time for multiple preparations (correct)
- Excellent dimensional stability after setting
- Minimal shrinkage towards the tray
- Short working time for single preparations
Which statement about polyether impression materials is true?
Which statement about polyether impression materials is true?
- They are supplied as a single paste system
- They have excellent dimensional stability upon polymerization (correct)
- They have poor dimensional stability upon polymerization
- They are recommended for use with a spacer-less tray
What is a disadvantage of polysulfide impression materials?
What is a disadvantage of polysulfide impression materials?
Which impression material is recommended for use with a special tray with a 4 mm spacer?
Which impression material is recommended for use with a special tray with a 4 mm spacer?
What is the recommended method for removing a polysulfide impression from the mouth?
What is the recommended method for removing a polysulfide impression from the mouth?
Which statement about polysulfide impression materials is true?
Which statement about polysulfide impression materials is true?
What is the recommended viscosity of impression material to use as a tray material during the final impression procedure?
What is the recommended viscosity of impression material to use as a tray material during the final impression procedure?
What is the main advantage of the Direct (intra oral) digital impression method?
What is the main advantage of the Direct (intra oral) digital impression method?
What is the primary disadvantage of the Direct (intra oral) digital impression method?
What is the primary disadvantage of the Direct (intra oral) digital impression method?
What is the term used to describe the process of fabricating a restoration using digital impression data and CAD/CAM technology?
What is the term used to describe the process of fabricating a restoration using digital impression data and CAD/CAM technology?
In the context of digital impressions, what does the acronym 'CAD' stand for?
In the context of digital impressions, what does the acronym 'CAD' stand for?
Which system is mentioned in the text as being widely used for Direct (intra oral) digital impressions?
Which system is mentioned in the text as being widely used for Direct (intra oral) digital impressions?
What is the term used to describe the process of capturing a digital impression directly from the prepared tooth?
What is the term used to describe the process of capturing a digital impression directly from the prepared tooth?
Where can the digital impression data be transferred after capture?
Where can the digital impression data be transferred after capture?
What is the term used to describe the method of taking a physical impression and fabricating a cast?
What is the term used to describe the method of taking a physical impression and fabricating a cast?
What is the first step in the spaced putty-wash impression technique?
What is the first step in the spaced putty-wash impression technique?
How is the space created inside the putty impression for the wash (light body) layer?
How is the space created inside the putty impression for the wash (light body) layer?
What is the purpose of creating a space inside the putty impression?
What is the purpose of creating a space inside the putty impression?
What is the difference between an unspaced putty impression and a spaced putty impression?
What is the difference between an unspaced putty impression and a spaced putty impression?
When should the putty impression be taken in relation to tooth preparation?
When should the putty impression be taken in relation to tooth preparation?
What is the purpose of the wash (light body) impression material in this technique?
What is the purpose of the wash (light body) impression material in this technique?
What is the purpose of using a polyethylene spacer in the spaced putty impression technique?
What is the purpose of using a polyethylene spacer in the spaced putty impression technique?
What is the difference between the spaced putty impression technique and the unspaced putty impression technique?
What is the difference between the spaced putty impression technique and the unspaced putty impression technique?
What does the image on the monitor show?
What does the image on the monitor show?
What allows the laboratory technician to fabricate a restoration with excellent marginal fit and accurate occlusion?
What allows the laboratory technician to fabricate a restoration with excellent marginal fit and accurate occlusion?
What advantage of digital impressions is mentioned in the text?
What advantage of digital impressions is mentioned in the text?
How are digital impressions stored according to the text?
How are digital impressions stored according to the text?
What issue is eliminated with a digital impression system?
What issue is eliminated with a digital impression system?
What is a disadvantage of digital impression systems mentioned in the text?
What is a disadvantage of digital impression systems mentioned in the text?
What is required to operate and maintain a digital impression system according to the text?
What is required to operate and maintain a digital impression system according to the text?
What is mentioned as a disadvantage of digital impression systems in the text?
What is mentioned as a disadvantage of digital impression systems in the text?
What is the main purpose of a conventional impression in crown and bridge prosthodontics?
What is the main purpose of a conventional impression in crown and bridge prosthodontics?
Why is it important for an impression in crown and bridge prosthodontics to include uncut tooth surface beyond the preparation?
Why is it important for an impression in crown and bridge prosthodontics to include uncut tooth surface beyond the preparation?
What role does the hydrophilicity of impression material play in crown and bridge prosthodontics?
What role does the hydrophilicity of impression material play in crown and bridge prosthodontics?
Why must the impression material used for crowns and bridges be elastic?
Why must the impression material used for crowns and bridges be elastic?
The spacer is removed before taking the putty impression in the spaced putty-wash technique.
The spacer is removed before taking the putty impression in the spaced putty-wash technique.
In the unspaced putty-wash technique, a space is created after teeth preparation.
In the unspaced putty-wash technique, a space is created after teeth preparation.
The light body impression material is injected before the heavy body impression material in the putty-wash technique.
The light body impression material is injected before the heavy body impression material in the putty-wash technique.
A spacer is used when taking impressions for post crowns to facilitate insertion into tiny canals.
A spacer is used when taking impressions for post crowns to facilitate insertion into tiny canals.
The light body impression material is removed from the patient's mouth before it is completely set.
The light body impression material is removed from the patient's mouth before it is completely set.
Impression materials for crowns and bridges need to be rigid to prevent distortion during removal.
Impression materials for crowns and bridges need to be rigid to prevent distortion during removal.
The putty impression should not include uncut tooth surfaces beyond the preparation.
The putty impression should not include uncut tooth surfaces beyond the preparation.
Digital impressions are typically stored in physical storage units according to the text.
Digital impressions are typically stored in physical storage units according to the text.
In crown and bridge prosthodontics, a good impression should only include the prepared tooth without considering the surrounding teeth and tissues.
In crown and bridge prosthodontics, a good impression should only include the prepared tooth without considering the surrounding teeth and tissues.
Bubble-free impressions are crucial in crown and bridge work to ensure accuracy, especially at the area of the finish line.
Bubble-free impressions are crucial in crown and bridge work to ensure accuracy, especially at the area of the finish line.
The material used for final impressions in crown and bridges should not be elastic after placement in the mouth.
The material used for final impressions in crown and bridges should not be elastic after placement in the mouth.
Hydrophilic impression materials have a low affinity for moisture and do not provide good surface wetting.
Hydrophilic impression materials have a low affinity for moisture and do not provide good surface wetting.
Digital impressions are stored in physical trays according to the text.
Digital impressions are stored in physical trays according to the text.
Polysulfide impression materials are not suitable for crown and bridge prosthodontics.
Polysulfide impression materials are not suitable for crown and bridge prosthodontics.
A light body impression material is primarily used for creating the main body of the impression in crown and bridge work.
A light body impression material is primarily used for creating the main body of the impression in crown and bridge work.
Accurate articulation of the cast is not important when taking impressions for crown and bridge prosthetics.
Accurate articulation of the cast is not important when taking impressions for crown and bridge prosthetics.
A plastic post can be used as reinforcement for the impression material.
A plastic post can be used as reinforcement for the impression material.
Air bubble presence in the area of preparation is not a concern when inspecting the impression.
Air bubble presence in the area of preparation is not a concern when inspecting the impression.
To obtain a good final impression, a wet field of operation is recommended.
To obtain a good final impression, a wet field of operation is recommended.
Digital impressions represent an outdated development in Dentistry.
Digital impressions represent an outdated development in Dentistry.
Digital impressions convert the shape of prepared teeth into two-dimensional images.
Digital impressions convert the shape of prepared teeth into two-dimensional images.
Hydrocolloids are hydrophobic and displace moisture.
Hydrocolloids are hydrophobic and displace moisture.
The main purpose of using a light consistency impression material is to create voids in the impression.
The main purpose of using a light consistency impression material is to create voids in the impression.
A special tray is not required when obtaining a good final impression.
A special tray is not required when obtaining a good final impression.
Polyether and hydrophilic addition silicon impression materials should be submerged in a glutaraldehyde solution for disinfection.
Polyether and hydrophilic addition silicon impression materials should be submerged in a glutaraldehyde solution for disinfection.
Impression material should be immediately rinsed with tap water after removal from the patient's mouth.
Impression material should be immediately rinsed with tap water after removal from the patient's mouth.
It is necessary to follow the manufacturer's recommendations when using disinfecting solutions or sprays on impression material.
It is necessary to follow the manufacturer's recommendations when using disinfecting solutions or sprays on impression material.
All impression materials come in contact with body fluid when removed from the patient's mouth.
All impression materials come in contact with body fluid when removed from the patient's mouth.
Glutaraldehyde Solution 10 should not be used for disinfection of impression materials.
Glutaraldehyde Solution 10 should not be used for disinfection of impression materials.
Disinfecting impression materials for too long can lead to dimensional and surface changes, affecting accuracy in dies and models.
Disinfecting impression materials for too long can lead to dimensional and surface changes, affecting accuracy in dies and models.
Polyether and hydrophilic addition silicon impression materials are not suitable for being sprayed and stored in a plastic bag for disinfection.
Polyether and hydrophilic addition silicon impression materials are not suitable for being sprayed and stored in a plastic bag for disinfection.
The impression material used for crowns and bridges should not be elastic.
The impression material used for crowns and bridges should not be elastic.
CAD-CAM stands for Computer Aided Designing - Computer Aided Milling.
CAD-CAM stands for Computer Aided Designing - Computer Aided Milling.
CAD/CAM systems consist of scanning, designing, and casting phases.
CAD/CAM systems consist of scanning, designing, and casting phases.
Digital scanning can be divided into Direct (intra oral) and Indirect (extra oral) digital impressions.
Digital scanning can be divided into Direct (intra oral) and Indirect (extra oral) digital impressions.
The introduction of CAD/CAM systems to dental field was in the 1990s.
The introduction of CAD/CAM systems to dental field was in the 1990s.
Indirect digital impression systems scan a stone cast or die of the prepared tooth in the patient's mouth.
Indirect digital impression systems scan a stone cast or die of the prepared tooth in the patient's mouth.
Direct digital impression systems require the dental technician to add porcelain for individualization of restorations.
Direct digital impression systems require the dental technician to add porcelain for individualization of restorations.
Master cast fabrication is a quick and error-free method in digital scanning.
Master cast fabrication is a quick and error-free method in digital scanning.
CAD CAM systems eliminate the need for preparation of abutment teeth in traditional impression techniques.
CAD CAM systems eliminate the need for preparation of abutment teeth in traditional impression techniques.
Study Notes
Impression Materials and Techniques
- Shadowing effect limits the use of extra-oral digitization methods.
- Direct (intra-oral) digital impression:
- Uses an intra-oral camera (scanner) to capture the desired image (optical impression).
- Transfers the image electronically to CAD/CAM for fabrication.
- Advantages: takes data directly from prepared tooth, eliminates need for impression and cast fabrication.
- Disadvantage: tongue and saliva may pose problems.
- Polysulfide impression material:
- Supplied as a two-paste system (base and catalyst).
- Available in various viscosities (light, medium, heavy).
- Advantages: accurate, long working time, excellent tear resistance.
- Disadvantages: messy, objectionable odor, long setting time, shrinkage towards tray.
- Polyether impression material:
- Excellent dimensional stability.
- Techniques: spaced putty impression, un-spaced putty impression.
- Advantages: high accuracy, minimal distortion.
- Disadvantages: complex procedure, operator skill required.
Digital Impression
- Advantages:
- Allows for single-appointment restoration fabrication.
- Eliminates impression fabrication and disinfection steps.
- Enables digital record-keeping and storage.
- Reduces chairside time.
- Disadvantages:
- Large camera size and weight.
- Complex equipment requires trained operator.
- High cost.
Conventional Impression
- Requirements for a good impression in crown and bridge prosthodontics:
- Accurate duplication of prepared tooth and surrounding tissues.
- Bubble-free impression.
- Registration of undercut surfaces without distortion or fracture.
- Properties of material used for final impression in crowns and bridges:
- Elastic after placement in the mouth.
- Hydrophilicity for good surface wetting and detail.
Impression Procedure
- Spaced putty wash technique:
- Record putty impression of dental arch, including prepared tooth.
- Create space inside impression using a spacer or scalpel.
- Mix light body impression material and inject around preparation and dental arch.
- Un-spaced putty wash technique:
- Record putty impression after teeth preparation.
- No space creation, direct injection of light body material.
Post-Crown Impression
- Requires impression for root canal space.
- Difficulty in inserting and removing impression material from canal.
- Use of reinforcement (plastic post or stainless wire) to support impression material.
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Description
Test your knowledge on final impressions in prosthodontics, focusing on conventional and digital impression techniques. Learn about the requirements for a good impression in crown and bridge prosthodontics.
