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Questions and Answers
What is the main purpose of retention form in tooth preparation?
What is the main purpose of retention form in tooth preparation?
- To prevent dislodgement of the restoration (correct)
- To enhance the strength of the tooth structure
- To allow for easy removal of the restoration when necessary
- To ensure aesthetic appearance of the restoration
Which factor does NOT influence retention form?
Which factor does NOT influence retention form?
- Roughness of the restoration fitting surface
- Magnitude of dislodging forces
- Color matching of the restoration (correct)
- Film thickness of the luting agent
How does the geometry of a tooth preparation affect retention form?
How does the geometry of a tooth preparation affect retention form?
- It affects friction between the restoration and tooth surface (correct)
- It determines the required luting agent
- It enhances the aesthetic quality of the restoration
- It provides a better color match for the restoration
What is meant by 'taper' in tooth preparation geometry?
What is meant by 'taper' in tooth preparation geometry?
Which of the following is a characteristic of traditional cements used in fixed prosthodontics?
Which of the following is a characteristic of traditional cements used in fixed prosthodontics?
Which of these best describes a critical mechanical consideration in tooth preparation?
Which of these best describes a critical mechanical consideration in tooth preparation?
What forces are typically smaller in comparison to the forces that attempt to seat a fixed dental prosthesis?
What forces are typically smaller in comparison to the forces that attempt to seat a fixed dental prosthesis?
Which of the following describes an aspect of resistance form in tooth preparation?
Which of the following describes an aspect of resistance form in tooth preparation?
What is the recommended convergence angle between opposing walls in tooth preparation?
What is the recommended convergence angle between opposing walls in tooth preparation?
How does the height of axial walls affect the retention of a crown?
How does the height of axial walls affect the retention of a crown?
What can be done to increase retention in an excessively tapered preparation?
What can be done to increase retention in an excessively tapered preparation?
What should be done to sharp occlusoaxial line angles during tooth preparation?
What should be done to sharp occlusoaxial line angles during tooth preparation?
Which restoration typically has the highest retention value?
Which restoration typically has the highest retention value?
How does surface roughness affect retention in dental restorations?
How does surface roughness affect retention in dental restorations?
Which material generally provides better retention when cemented?
Which material generally provides better retention when cemented?
Which statement about the cement adherence property is true?
Which statement about the cement adherence property is true?
What is the primary purpose of resistance form in tooth preparation?
What is the primary purpose of resistance form in tooth preparation?
Which factor is NOT involved in affecting the resistance form of a cemented restoration?
Which factor is NOT involved in affecting the resistance form of a cemented restoration?
Which alloy thickness is recommended over functional cusps to prevent deformation in restorations?
Which alloy thickness is recommended over functional cusps to prevent deformation in restorations?
What is the minimum alloy thickness suggested for nonfunctional cusps in a dental restoration?
What is the minimum alloy thickness suggested for nonfunctional cusps in a dental restoration?
What should be considered in margin design to prevent distortion of dental restorations?
What should be considered in margin design to prevent distortion of dental restorations?
Which type of restoration is noted for optimal esthetics due to its minimal material thickness requirement?
Which type of restoration is noted for optimal esthetics due to its minimal material thickness requirement?
Which of the following factors influences the ability of a restoration to resist deformation during function?
Which of the following factors influences the ability of a restoration to resist deformation during function?
Why is adequate tooth reduction important in the context of preventing deformation?
Why is adequate tooth reduction important in the context of preventing deformation?
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Study Notes
Mechanical Considerations
- Retention Form: The ability of a preparation to resist forces trying to remove the restoration parallel to the path of placement.
- Factors Affecting Retention Form:
- Magnitude of Dislodging Forces: Forces working to dislodge a fixed prosthesis when pulling with floss or eating sticky food.
- Geometry of the Tooth Preparation:
- Taper: The convergence of opposing preparation walls, ideally 6 degrees.
- Surface Area: Larger surface area (tall axial walls, molar crowns) provide higher retention.
- Grooves: Can enhance retention in excessively tapered preparations.
- Stress Concentration: Rounded occlusoaxial line angles minimize stress on the preparation.
- Type of Preparation: Complete crowns have higher retention than partial coverage restorations.
- Roughness of Surfaces Being Cemented: Smooth internal restoration surfaces increase the risk of failure at the cement-restoration interface.
- Materials Being Cemented: Different materials (cast gold, amalgam, composite resin) have varying adhesion to cements.
- Factors Affecting Retention Form:
- Resistance Form: The ability of the restoration to resist lateral forces.
- Factors Affecting Resistance Form:
- Magnitude and Direction of Dislodging Forces: The forces pushing the restoration away from its path of placement.
- Geometry of the Tooth Preparation: The shape of the preparation influences its ability to withstand lateral forces.
- Physical Properties of the Luting Agent: The cement’s strength and ability to bond to the surfaces play a role in the resistance form.
- Factors Affecting Resistance Form:
- Preventing Deformation: Ensures the restoration has enough strength to prevent permanent changes in shape during function.
- Factors Affecting Deformation:
- Alloy Selection: Choosing an appropriate alloy for the desired strength and resistance to deformation.
- Adequate Tooth Reduction: Minimum metal thickness over functional cusps (1.5 mm) is essential, while less stressed cusps can be protected with 1 mm.
- Margin Design: Sufficient space for metal at the margin is needed to prevent distortion.
- Factors Affecting Deformation:
Esthetic Considerations
- The goal of esthetic restorations is to appear natural and pleasing.
- All-Ceramic Restorations: Offer the most desirable esthetic appearance. A minimum thickness of 1 to 1.2 mm is needed to achieve optimal esthetics.
- Metal-Ceramic Restorations: Less esthetically appealing due to the opaque metal substructure.
- Partial-Coverage Restorations: Esthetics are influenced by the type of preparation and the materials used.
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