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Questions and Answers
What is the primary function of a transfer coping in implant overdenture procedures?
What is the primary function of a transfer coping in implant overdenture procedures?
- To determine the final shade of the restoration.
- To transfer the position and orientation of the implant or abutment to a master cast. (correct)
- To measure the interocclusal distance for proper denture height.
- To act as a temporary crown during the healing phase.
In the context of impression techniques for implant overdentures, what is a key difference between direct and indirect transfer copings?
In the context of impression techniques for implant overdentures, what is a key difference between direct and indirect transfer copings?
- Direct transfer copings are used with closed trays, while indirect transfer copings are used with open trays.
- Direct transfer copings are made of metal, while indirect transfer copings are made of plastic.
- Direct transfer copings are screwed into the abutment or implant body and removed after the impression, while indirect remain in place during impression removal. (correct)
- Direct transfer copings are only used for single implants, while indirect transfer copings are for multiple implants.
Which of the following is a characteristic property of transfer copings used in the indirect impression technique for implant overdentures?
Which of the following is a characteristic property of transfer copings used in the indirect impression technique for implant overdentures?
- Flat sides or smooth undercuts to aid in retention within the impression. (correct)
- A tapered design for easy insertion into the implant.
- Color-coding for easy identification.
- A hollow central screw to secure it to the abutment.
What is the primary advantage of using a direct transfer coping technique in implant overdenture impressions?
What is the primary advantage of using a direct transfer coping technique in implant overdenture impressions?
An implant analog is used in the fabrication of implant overdentures to:
An implant analog is used in the fabrication of implant overdentures to:
In the classification of impression techniques, what characterizes the "closed tray technique" for implant overdentures?
In the classification of impression techniques, what characterizes the "closed tray technique" for implant overdentures?
Which of the following impression techniques involves using a custom tray with openings to allow access to the transfer copings?
Which of the following impression techniques involves using a custom tray with openings to allow access to the transfer copings?
Functional impression techniques for implant overdentures are often used with what type of tray?
Functional impression techniques for implant overdentures are often used with what type of tray?
When fabricating a custom tray for a dual impression technique in an implant overdenture case, what is a critical consideration regarding the edentulous areas?
When fabricating a custom tray for a dual impression technique in an implant overdenture case, what is a critical consideration regarding the edentulous areas?
During the custom tray evaluation step for a dual impression technique, what characteristic should the tray exhibit?
During the custom tray evaluation step for a dual impression technique, what characteristic should the tray exhibit?
In the context of custom tray fabrication for selective pressure impression techniques, what is the purpose of creating relief over the residual ridge?
In the context of custom tray fabrication for selective pressure impression techniques, what is the purpose of creating relief over the residual ridge?
In the selective pressure impression technique, what material is typically used for border molding the tray distal to the abutments?
In the selective pressure impression technique, what material is typically used for border molding the tray distal to the abutments?
During the final impression stage of a selective pressure technique, why are holes created on the anterior portion of the custom tray?
During the final impression stage of a selective pressure technique, why are holes created on the anterior portion of the custom tray?
What type of pressure is applied during the selective pressure impression technique when injecting elastomeric material through the holes in the custom tray?
What type of pressure is applied during the selective pressure impression technique when injecting elastomeric material through the holes in the custom tray?
What is the significance of the force direction and distribution in implant-retained overdentures as compared to traditional dentures?
What is the significance of the force direction and distribution in implant-retained overdentures as compared to traditional dentures?
In comparison to traditional complete dentures, what is a primary factor influencing the selection of special impression techniques for implant overdentures?
In comparison to traditional complete dentures, what is a primary factor influencing the selection of special impression techniques for implant overdentures?
During the alginate primary impression for a dual impression technique, what structures should already be in place?
During the alginate primary impression for a dual impression technique, what structures should already be in place?
What is the correct sequence of steps for dual impression techniques?
What is the correct sequence of steps for dual impression techniques?
What is the rationale behind using light body elastomeric material around the impression copings near the gingival tissues?
What is the rationale behind using light body elastomeric material around the impression copings near the gingival tissues?
What is a key consideration when making an impression over two implants?
What is a key consideration when making an impression over two implants?
Flashcards
Implant Overdenture Force
Implant Overdenture Force
Force direction and distribution of implant-retained overdentures are similar to bilateral distal extension removable partial dentures.
Transfer Coping
Transfer Coping
A device used to transfer the position and orientation of the implant or abutment to a master cast.
Indirect Transfer Coping Technique
Indirect Transfer Coping Technique
Screwed into implant body; remains in place when the impression sets. Removed from the mouth, reoriented in impression after removal.
Direct Transfer Coping Technique
Direct Transfer Coping Technique
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Implant Analog
Implant Analog
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Closed Tray Technique
Closed Tray Technique
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Open Tray Technique
Open Tray Technique
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Single Phase Impression
Single Phase Impression
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Selective Pressure Technique
Selective Pressure Technique
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Functional Impression Technique
Functional Impression Technique
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Dual Impression Technique
Dual Impression Technique
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Study Notes
- Implant overdenture impressions are similar to bilateral distal extension removable partial dentures (RPDs), Kennedy Class I.
- The difference lies in the resilience of the mucosa versus the rigidity of the implants, necessitating special impression techniques.
Definitions
- A transfer coping is used to transfer the implant or abutment's position and orientation to create a master cast.
- An implant analog replicates the implant body on the master cast.
- The analog attaches to the transfer coping after the master impression, and the assembly is poured in stone to fabricate the master cast.
Transfer Coping: Indirect vs. Direct
- Indirect transfer copings are used with a closed tray technique
- Direct transfer copings are used with an open tray technique.
Indirect Transfer Coping
- Tray used: Closed tray.
- Technique: Coping is screwed into the implant body and remains in place as the impression sets and is removed from the mouth. The coping is then reoriented in the impression.
- Properties: Has flat sides or smooth undercuts.
Direct Transfer Coping
- Tray used: Open tray.
- Technique: Coping is screwed into the abutment or implant body. After the impression sets, it is unscrewed to allow removal of the impression and eliminates error of deformation
- Properties: Hollow with a long central screw to secure it to the abutment or implant body.
Impression Technique Classifications
- According to the tray used
- Closed tray technique (indirect transfer coping).
- Open tray technique (direct transfer coping).
- According to Phase
- Single-phase impression technique.
- Dual impression technique (double phase impression).
- Types
- Functional impression techniques (used with open tray).
- Selective pressure techniques (used with open tray).
Dual Impression Techniques
- Functional impression technique
Steps for Functional Impression Technique
- Alginate primary impression is made with healing abutments in place.
- A custom tray is fabricated with openings opposite the implant areas and without openings opposite edentulous areas.
- Custom tray evaluation:
- The tray should be well adapted.
- Impression copings project through the openings without contacting the acrylic resin tray.
- Border molding and functional impression of alveolar mucosa using Zn oxide eugenol under compression.
- Light body elastomeric material is injected around the impression copings near the gingival tissues.
Selective Pressure Impression Technique
- Custom tray fabrication:
- A relief is created over the residual ridge, except on primary stress-bearing areas (buccal shelves).
- One or two layers of baseplate wax are adapted to the abutments.
- Holes are made on the anterior portion for injection of elastomeric impression material.
- Border molding to the tray distal to the abutments using green modeling compound, followed by a secondary ZOE (zinc oxide eugenol) impression,
- Any excess material extending into the abutment region is removed.
- An impression over two implants is made by injecting elastomeric impression material through the holes while applying finger pressure to the distal portion of the tray.
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