38 Questions
What is the difference between tissue level and bone level implants?
The neck of bone level implant is at the level of bone, while the neck of tissue level implant is moved 2-3 mm coronally near the gingival margin
What are the two options for obtaining fixed retention systems for fixed implant-supported prostheses?
Screw retaining or through cementation
Which type of prosthesis is suitable for a partially edentulous patient in implant dentistry?
Implant supported prosthesis
What are the components involved in fabricating a single implant-supported crown?
Implant, abutment, and crown
What is the recommended torque for inserting the abutment for a cement retained crown?
35N
How often should a recall visit be scheduled for an implant-supported single crown?
Every 3-6 months
What should be monitored to ensure proper maintenance of an implant-supported single crown?
All of the above
What should be checked during maintenance of an implant-retained overdenture?
All of the above
What should be done if traumatized gingiva is detected during maintenance of an implant-retained overdenture?
Reduce and smooth the relevant area on the denture
What is the recommended follow-up period after delivery of an implant-supported single crown?
One month
What is the purpose of probing gently during maintenance of implant-supported restorations?
To ensure there is no bleeding on probing
What should be evaluated on a routine basis for the occlusal status of an implant-supported crown?
Both verbal verification and intra-oral evaluation
What is the purpose of standard abutments in dental implants?
To be used when the implant is almost ideally placed
What is the main difference between screw-retained and cement-retained implant supported crowns?
The method of joining the prosthesis to the implants
Why are cover screws used in dental implants?
For subgingival healing
What is the purpose of custom abutments in dental implants?
To join the prosthesis to the implants in complicated cases
What issue was reported with the external hexagon configuration implant-abutment connection interface introduced by Branemark?
Screw loosening
What was developed to address the issue of screw loosening associated with the external hexagon configuration implant-abutment connection interface?
Internal connection implants
What are the two basic implant connection geometries?
External and Internal
What type of connections can external connections have on the implant platform?
Hexagons, Octagons, Tri-lobe, and Tapers
What is the purpose of internal connection design enhancements?
Improve connection stability, simplify clinician's armamentarium, and provide preciseness of fit for stability and screw tightening
What are the three types of prosthetic platforms mentioned in the text?
Small, Narrow, and Regular
What is used to transfer 3D implant position and design the crown and abutment?
Impression coping and analog
Which factor can impact the design of the crown and abutment?
Implant angulation
What defines the length of the abutment and influences the choice between screw-retained and cement-retained restorations?
Interocclusal distance
Which impression technique impacts the ease of removal and replacement of the impression copings?
Open tray
What is used to counteract screw loosening?
Screw preload
What is used to transfer 3D implant position and design the crown and abutment?
Impression coping and analog
What is used to transfer 3D implant position and design the crown and abutment?
Impression coping and analog
What is used to counteract screw loosening?
Screw preload
Which impression technique involves unscrewing the impression coping to remove the tray from the mouth?
Open tray impression technique
What type of abutment has a locator denture cap, male processing nylon locator abutment, and tissue depth for proper positioning and seating?
CAD / CAM abutment
For which type of prostheses do gold abutments with custom-designed metal alloy framework and porcelain for esthetics and hygiene access work best?
Cement-retained implant-supported crowns
What is the minimum requirement for interarch space in standard abutments?
2mm
Which format is used by intraoral scanners to record the three-dimensional geometry of objects in the mouth?
STL format
What is the correct torque for tightening Straumann abutments?
$35 Ncm$
What should be checked through an x-ray when using bone-level open tray impression copings?
Implant angulation and position
Which type of impression technique captures the implant's position and orientation with a scan body engaged to the implant and scanner?
$Digital$ impression using intraoral scanners
Study Notes
- Impression copings remain embedded in the impression during the process of making a definitive cast
- In closed tray technique, copings stay attached to implants during impression retrieval and are placed back into impression with implant analogs
- Impression copings for bone-level open tray have a screw that attaches them to the implant, and an x-ray should be taken to check the correct seating
- Open tray impression technique involves unscrewing the impression coping to remove the tray from the mouth
- The closed tray concept includes a snap-on impression cap with a polymer cap, metal post, and metal screw
- Digital impression using intraoral scanners captures the implant's position and orientation with a scan body, which is engaged to the implant and scanner to take a direct optical impression
- Intraoral scanners use the open STL format and record the three-dimensional geometry of the object in the mouth
- Standard abutment requirements include a minimum interarch space, consistent implant angulation and position, and a distance between the gingival margin and implant platform of 2mm or less
- Custom abutment considerations include a distance between the gingival margin and implant platform more than 5mm, excessive implant angulation, patient's restoration needs, and for all screw-retained prostheses
- Prefabricated abutments like Synocta come with three units for cement-retained implant-supported crowns, and gold abutments have a custom-designed metal alloy framework with porcelain for esthetics and hygiene access
- CAD / CAM abutments have a locator denture cap, male processing nylon locator abutment, tissue depth, and abutment height to ensure proper positioning and seating
- Abutment seating requires positioning into the implant head, making sure the connection extension engages properly, and tightening the screw to the correct torque, which is 35 Ncm for Straumann abutments.
Test your knowledge on the advantages and disadvantages of external and internal connection types in dental implants. Explore the shift from external to internal connections and the key geometric features that distinguish the two types.
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