Questions and Answers
The internal connection is reported to have worse resistance to torque loss compared to external connections.
False
A dull sound during percussion indicates screw loosening rather than implant failure.
False
Platform switching involves using an abutment that is larger than the implant platform to prevent bone loss.
False
The preload created by applying torque leads to elongation of the screw and places it in tension.
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The strongest connection in implant systems is considered to be the conical connection.
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The emergence profile consists solely of the aesthetic zone.
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A deeper margin in a cemented abutment leads to less undetected cement around the implant.
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Cast customizable abutments are known for their precise fit and smooth surfaces to minimize bacterial colonization.
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Stock abutments are characterized by their simple use, low cost, and precision fit to the implant.
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The curvature of the emergence profile should primarily be convex to support the gingival health.
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Study Notes
Connection
- Flexion of the abutment under applied forces can create micro-gaps, allowing bacteria to enter through a pumping action during loading.
Internal vs External Connection
- Internal connections provide better implant-abutment stability and resist screw loosening and torque loss effectively.
- They require reduced vertical height from the implant platform to the abutment top, improving aesthetics and function.
- Lateral loading is distributed deep within the implant, better protecting the abutment screw.
- Long internal wall engagement results in a stiff body, minimizing micromovement and joint opening.
Engaging vs Non-Engaging Abutments
- Engaging abutments have a single path of insertion essential for cemented restorations and utilize anti-rotation indexing.
Identifying Screw Loosening vs Implant Failure
- X-ray imaging can help assess the condition of the implant.
- Pain during or after loading may indicate issues.
- Percussion test: a dull sound typically signifies implant failure, while a metallic sound indicates screw loosening.
- Loose screws will not rotate due to their indexed design.
Factors Affecting Screw Loosening
- Preload: The initial load from torque application leads to screw elongation and tension, enhancing screw stability and fatigue resistance.
- Component Fit: Poor fit, often due to high bone around the implant, can lead to issues.
- Platform Switching: Using a smaller abutment diameter than the implant platform can prevent bone loss and promote healthier tissue.
- Platform Dimension: Wider platforms correlate with reduced screw loosening incidents.
- Hex Height: Increased height enhances screw resistance to loosening.
Strongest Connection
- The conical connection is noted as the most robust type.
Transmucosal Area
- The region between the implant shoulder and mucosal margin is vital for the support and stability of peri-implant soft tissues.
- The emergence profile includes a biological zone (supports tissues) and an aesthetic zone (natural appearance).
- The abutment emergence should feature mixed curvature: concave for gingival support and convex for aesthetic purposes.
Retentive Part and Cemented Abutments
- Deeper margins on the abutment lead to an increase in undetected cement around the implant.
Types of Cemented Abutments
- Cast Customizable Abutments: Often lack precision leading to rough surfaces, increasing bacterial colonization and potential bone loss.
- CAD/CAM Customizable Abutments: Offer higher precision and adaptability.
-
Stock Abutments (Prefabricated):
- Easy to use and low cost.
- Provide a precision fit to the implant.
- Available in various gingival heights for optimal aesthetics and function.
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Description
This quiz focuses on the differences between internal and external connections in dental implants. It explores the advantages of internal connections, including stability and resistance to torque loss. Assess your understanding of these concepts related to dental implant design.
