35 Questions
Which statement about natural teeth and implants is true?
Natural teeth have a PDL to compensate for minor inaccuracies
What is the primary reason for making an accurate implant impression?
To ensure a proper support for the definitive restoration
What is a characteristic of poly-vinyl siloxane impression material?
Multiple viscosities are available and is relatively stable
What is a disadvantage of using hydrocolloid impression material?
It has a low tear strength
Why is it critical to record the 3-dimensional position of implants?
Because implants do not have a PDL to compensate for minor inaccuracies
What is the primary advantage of using the Closed Tray Impression Technique?
Easier to perform with short inter-arch distance
What is the main reason for splinting multiple implant impressions using acrylic resin?
To stabilize the copings against rotation during fixture or abutment analog fastening
According to Liou Ad (1993), which of the following is a limitation of the Closed Tray Impression Technique?
All of the above
What is the primary disadvantage of using the Open Tray Impression Technique for multi-unit cases?
Less accurate for multi-unit impressions
Which of the following is NOT a characteristic of the Closed Tray Impression Technique?
Suitable for deeply placed implants
According to the studies, which technique was found to be significantly more accurate?
Splinting technique
What is the primary advantage of using the splinting technique in multiple implants?
It reduces the effect of implant angulation
What is a potential disadvantage of using the All on Six technique?
It may result in a misfit when securing the implant analog
What is the primary indication for using the All on Six technique?
When the implants are very closely located
Which of the following materials can be used at the time of impression in the splinting technique?
Autopolymerising resin
What is the purpose of a diagnostic wax up in implant level impressions?
To design the prosthetic restoration
What should be included in a lab prescription for an implant level impression?
The impression, implant analog, and detailed prosthetic design
What is the purpose of mounting models in laboratory procedures?
To select an abutment
What is necessary to send to the laboratory for an implant level impression?
Impression, implant analog, and abutment screws
What can minimize probable errors in implant level impressions?
Recording the 3-dimensional position of implants accurately
What is the consequence of imprecise superstructure fit in dental implants?
Biologic consequences that disrupt the function of dental implants
Which of the following is a benefit of precise impression methodology in dental implants?
Decreased failures related to supra structure fabrication
What is the significance of verifying the seating of components in implant impression making?
To prevent errors in impression making
What is the finding of a study comparing different impression methods in implant dentistry?
No significant difference in marginal discrepancy between different impression methods
What is the consequence of non-uniform thickness of impression material in implant impression making?
Errors in impression making
What is the primary consequence of inaccurate impression methodology in implant dentistry?
Mechanical and biologic consequences
What is the significance of verifying the seating of components in implant impression making?
To prevent component errors in impression making
Which of the following is a characteristic of implant level impressions?
Verification of component seating
What is the primary advantage of precise impression methodology in dental implants?
Decreased fabrication failures
What is the main consequence of non-uniform thickness of impression material in implant impression making?
Imprecise superstructure fit
What is the primary finding of a study comparing different impression methods in implant dentistry?
No significant difference was noted between methods
What is the primary consequence of imprecise superstructure fit in dental implants?
Mechanical and biologic consequences
What is the significance of three-dimensional accuracy in implant and abutment level impression techniques?
To minimize the effect of marginal discrepancy
What is the primary advantage of using precise impression methodology in implant dentistry?
Decreased fabrication failures
What is the consequence of inaccurate component seating in implant impression making?
Component errors in impression making
Study Notes
Impression Techniques for Implant Prostheses
- Accurate recording of spatial implant position is required to obtain a proper support to definitive restoration with passive fitting.
Importance of Implant Impressions
- In implants, there is no PDL to compensate for minor inaccuracies like in natural teeth.
- The 3-dimensional position of the implants must be recorded accurately.
Materials Required for Implant Impressions
- Various impression materials are available, including polyvinyl siloxane, polyether, and polysulfide.
- Each material has its own advantages and disadvantages, such as toxicity, stability, and tear strength.
Impression Techniques for Implant Prostheses
- There are two main impression techniques: implant level and abutment level.
- Implant level impressions can be further divided into open tray and closed tray techniques.
Implant Level Impressions
- Open tray impressions are more accurate for multi-unit cases, but less accurate for cases with implant/abutment angulations and path of insertion withdrawal.
- Closed tray impressions are easier and more suitable for short inter-arch distances, but may have inaccuracies with recovery and subsequent deformation of the impression material.
Open Tray Impression Technique
- This technique is more accurate, but may have limitations for cases with implant/abutment angulations and path of insertion withdrawal.
Closed Tray Impression Technique
- This technique is easier and more suitable for short inter-arch distances, but may have inaccuracies with recovery and subsequent deformation of the impression material.
Splinting for Multiple Implant Impressions
- Splinting is a technique used to stabilize the copings against rotation during fixture or abutment analog fastening and control the relationship between implants in a rigid fashion.
- Studies have shown that splinting technique is significantly more accurate than unsplinted techniques.
Steps in Splinting Multiple Implants for Impression
- The steps include using autopolymerising resin, impression plaster, and polyether, and reconnecting the copings.
All on Six
- This technique is used for very closely located implants, reduces the effect of movement of the impression coping, and removes the concern for replacing the coping back into its respective space in the impression.
Abutment Level Impressions
- Abutment level impressions are used for custom-made abutments and selecting abutments in the laboratory.
Direct-Abutment Level Impression Technique
- This technique is used for provisional restoration fabrication and is simple and quick.
Indirect-Abutment Level Impression Technique
- This technique is used for custom-made abutments and selecting abutments in the laboratory.
Gingival Masking
- This technique is used to mask the gingival area and create a more accurate impression.
What to Send to the Lab?
- The necessary information and materials to send to the lab include lab prescription, accurate impressions, mounted models, and implant analog.
Probable Errors and Minimization
- Errors can occur during impression making, including improper interface between impression post and implant analogue, and non-uniform thickness of material.
- These errors can be minimized by verifying the seating of components and using latex gloves with PVS impression material.
Literature Review
- A study found that there is no significant difference between abutment level and implant level (closed tray and open tray) impression techniques in terms of marginal discrepancy.
Conclusion
- Precise impression methodology is crucial to decrease failures related to suprastructure fabrication.
- Imprecise superstructure fit can result in mechanical and biologic consequences that disrupt the function of dental implants.
Impression Techniques for Implant Prostheses
- Accurate recording of spatial implant position is required to obtain a proper support to definitive restoration with passive fitting.
Importance of Implant Impressions
- In implants, there is no PDL to compensate for minor inaccuracies like in natural teeth.
- The 3-dimensional position of the implants must be recorded accurately.
Materials Required for Implant Impressions
- Various impression materials are available, including polyvinyl siloxane, polyether, and polysulfide.
- Each material has its own advantages and disadvantages, such as toxicity, stability, and tear strength.
Impression Techniques for Implant Prostheses
- There are two main impression techniques: implant level and abutment level.
- Implant level impressions can be further divided into open tray and closed tray techniques.
Implant Level Impressions
- Open tray impressions are more accurate for multi-unit cases, but less accurate for cases with implant/abutment angulations and path of insertion withdrawal.
- Closed tray impressions are easier and more suitable for short inter-arch distances, but may have inaccuracies with recovery and subsequent deformation of the impression material.
Open Tray Impression Technique
- This technique is more accurate, but may have limitations for cases with implant/abutment angulations and path of insertion withdrawal.
Closed Tray Impression Technique
- This technique is easier and more suitable for short inter-arch distances, but may have inaccuracies with recovery and subsequent deformation of the impression material.
Splinting for Multiple Implant Impressions
- Splinting is a technique used to stabilize the copings against rotation during fixture or abutment analog fastening and control the relationship between implants in a rigid fashion.
- Studies have shown that splinting technique is significantly more accurate than unsplinted techniques.
Steps in Splinting Multiple Implants for Impression
- The steps include using autopolymerising resin, impression plaster, and polyether, and reconnecting the copings.
All on Six
- This technique is used for very closely located implants, reduces the effect of movement of the impression coping, and removes the concern for replacing the coping back into its respective space in the impression.
Abutment Level Impressions
- Abutment level impressions are used for custom-made abutments and selecting abutments in the laboratory.
Direct-Abutment Level Impression Technique
- This technique is used for provisional restoration fabrication and is simple and quick.
Indirect-Abutment Level Impression Technique
- This technique is used for custom-made abutments and selecting abutments in the laboratory.
Gingival Masking
- This technique is used to mask the gingival area and create a more accurate impression.
What to Send to the Lab?
- The necessary information and materials to send to the lab include lab prescription, accurate impressions, mounted models, and implant analog.
Probable Errors and Minimization
- Errors can occur during impression making, including improper interface between impression post and implant analogue, and non-uniform thickness of material.
- These errors can be minimized by verifying the seating of components and using latex gloves with PVS impression material.
Literature Review
- A study found that there is no significant difference between abutment level and implant level (closed tray and open tray) impression techniques in terms of marginal discrepancy.
Conclusion
- Precise impression methodology is crucial to decrease failures related to suprastructure fabrication.
- Imprecise superstructure fit can result in mechanical and biologic consequences that disrupt the function of dental implants.
Learn about the importance of accurate impression recording in implant prostheses, including materials required, different techniques, and common errors. Compare implants with crowns and bridges.
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