Podcast
Questions and Answers
Which of the following is NOT a synonym for a full metal crown?
Which of the following is NOT a synonym for a full metal crown?
What is the main purpose of placing a crown on a tooth with a large filling?
What is the main purpose of placing a crown on a tooth with a large filling?
Which of these crown types has the highest percentage of noble elements?
Which of these crown types has the highest percentage of noble elements?
What is a disadvantage of using a full metal crown over a partial crown?
What is a disadvantage of using a full metal crown over a partial crown?
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According to the content, what is a common reason to place a full metal crown?
According to the content, what is a common reason to place a full metal crown?
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Which of the following correctly states the composition of a Noble metal crown?
Which of the following correctly states the composition of a Noble metal crown?
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Based on the content, what is a major advantage of metal crowns compared to other types of crowns?
Based on the content, what is a major advantage of metal crowns compared to other types of crowns?
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Which of the following is NOT a typical indication for a full metal crown?
Which of the following is NOT a typical indication for a full metal crown?
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What does the content suggest about using an electrical pulp tester on a tooth restored with a full metal crown?
What does the content suggest about using an electrical pulp tester on a tooth restored with a full metal crown?
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When preparing a tooth for a full metal crown, the axial reduction should ideally be:
When preparing a tooth for a full metal crown, the axial reduction should ideally be:
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Which of the following burs is LEAST appropriate for the initial tooth preparation steps of a full metal crown?
Which of the following burs is LEAST appropriate for the initial tooth preparation steps of a full metal crown?
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Which of the following is NOT included in the general steps for tooth preparation for a full metal crown?
Which of the following is NOT included in the general steps for tooth preparation for a full metal crown?
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For occlusal reduction, what is the recommended depth for the initial depth holes?
For occlusal reduction, what is the recommended depth for the initial depth holes?
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A functional cusp bevel is primarily intended to:
A functional cusp bevel is primarily intended to:
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Which of these cusps is considered a non-functional cusp on a maxillary tooth?
Which of these cusps is considered a non-functional cusp on a maxillary tooth?
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What is the recommended taper for axial reduction of a tooth for a full metal crown?
What is the recommended taper for axial reduction of a tooth for a full metal crown?
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What is the primary purpose of using guiding grooves during occlusal reduction?
What is the primary purpose of using guiding grooves during occlusal reduction?
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When making depth orientation grooves, according to the content, where should grooves be placed on a cusp?
When making depth orientation grooves, according to the content, where should grooves be placed on a cusp?
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According to the content, what tool is suggested for creating depth orientation grooves on a tooth?
According to the content, what tool is suggested for creating depth orientation grooves on a tooth?
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What is the recommended depth of reduction on the functional cusps?
What is the recommended depth of reduction on the functional cusps?
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What tool is recommended for precisely judging the depth of grooves after they are made?
What tool is recommended for precisely judging the depth of grooves after they are made?
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How should the tooth structure be removed between the depth orientation grooves according to the content?
How should the tooth structure be removed between the depth orientation grooves according to the content?
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What type of bur is mentioned for planar occlusal reduction, in addition to the round tapered diamond bur?
What type of bur is mentioned for planar occlusal reduction, in addition to the round tapered diamond bur?
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What material is used to check occlusal clearance after tooth preparation according to the content?
What material is used to check occlusal clearance after tooth preparation according to the content?
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During axial reduction, how should the diamond bur shank be oriented?
During axial reduction, how should the diamond bur shank be oriented?
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When placing guiding grooves during axial reduction, the diamond bur should NOT cut:
When placing guiding grooves during axial reduction, the diamond bur should NOT cut:
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What type of diamond bur is primarily recommended for facial and lingual axial reduction?
What type of diamond bur is primarily recommended for facial and lingual axial reduction?
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Ideally, how far interproximally should the facial axial reduction be extended?
Ideally, how far interproximally should the facial axial reduction be extended?
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How far interproximally should lingual axial reduction ideally extend?
How far interproximally should lingual axial reduction ideally extend?
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What is observed in the occlusal view after axial reduction, but prior to proximal reduction?
What is observed in the occlusal view after axial reduction, but prior to proximal reduction?
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Which type of diamond bur is recommended for the proximal reduction?
Which type of diamond bur is recommended for the proximal reduction?
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When accessing tight areas during proximal reduction, which part of the thin needle diamond may be employed?
When accessing tight areas during proximal reduction, which part of the thin needle diamond may be employed?
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What is the function of a torpedo diamond bur in crown preparation?
What is the function of a torpedo diamond bur in crown preparation?
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Where should the seating groove be placed relative to the chamfer line in a full veneer crown preparation?
Where should the seating groove be placed relative to the chamfer line in a full veneer crown preparation?
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What is the primary function of the alignment grooves during axial reduction?
What is the primary function of the alignment grooves during axial reduction?
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Which of the following is a critical area during crown preparation?
Which of the following is a critical area during crown preparation?
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What is the purpose of breaking the proximal contact in crown preparation?
What is the purpose of breaking the proximal contact in crown preparation?
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Which of the following follows the breaking of proximal contacts?
Which of the following follows the breaking of proximal contacts?
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What is the sequence of preparation steps, based on the provided review?
What is the sequence of preparation steps, based on the provided review?
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What is the final step in full veneer crown preparation based on the review?
What is the final step in full veneer crown preparation based on the review?
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Study Notes
Extra-Coronal Full Coverage Tooth
- Presentation by Dr. Hala M. Alhawij, BDS, MSc, University of Tripoli, 2024
- Topics covered include various types of dental crowns, their advantages, disadvantages, indications, contraindications, and tooth preparation procedures
- Crown types: full metal, all ceramic, metal ceramic, zirconia
Types of Crowns
- Different types of crowns are used for various dental purposes, including protecting or repairing damaged teeth
- Full metal, porcelain fused to metal, all-ceramic/all-porcelain, and zirconia are mentioned as examples
Need for Crowns
- Protect weakened teeth from breakage, repair cracked teeth, restore misshapen or discolored teeth
- Repair broken teeth
- Used to support teeth with large fillings
- Used to cover teeth that have undergone root canal treatment
- Cover dental implants
Definition of All-Metal Crown
- Metallic artificial restoration for the coronal portion of the tooth, maintaining function
- Contour and anatomical replication
- Gold crowns historically represent wealth and luxury in some cultures
Synonyms for Crowns
- Full cast crown
- Complete cast crown
- All metal crown
- Full veneer crown
Types of Metal Crowns
- High noble metal crown: Contains 60% noble elements, with 40% gold
- Noble metal crown: Contains at least 25% noble elements
- Base metal crown: Contains less than 25% noble elements
Advantages of Metal Crowns
- Exceptional strength compared to other crown types
- High quality material
- Durability, lasting longer than other crowns
- Great retention, securely maintaining the crown
- Suitable for repairing hidden teeth
Disadvantages of Metal Crowns
- Removing extensive tooth structure
- Difficulty evaluating tooth vitality with electrical pulp testers
- May affect taste perception
- Visible metal appearance
Indications of Full Metal Crown
- Teeth with considerable destruction (caries or trauma) to hold the remaining structure intact
- Teeth with existing large amalgam restorations to strengthen the remaining structure
- Endodontically treated teeth
- Teeth requiring maximum retention and resistance, often in cases of short crowns
- Recontouring teeth prior to supporting removable partial dentures
- Used as retainer for bridges
Contraindications of Full Metal Crowns
- High aesthetic needs
- Insufficient retention and resistance
- Cases where a conservative crown type (e.g., 3/4 crown) is a more suitable option, especially for teeth with limited buccal surface or shorter bridge spans
- Low caries index
Tooth Preparation Steps
- Occlusal surface preparation
- Buccal surface preparation
- Lingual surface preparation
- Proximal surfaces preparation
Armamentarium
- Handpiece
- Coarse-grit round-end tapered diamond
- Fine-grit round-end tapered diamond
- Medium-grit short needle diamond
- Coarse-grit tapered torpedo diamond
- Fine-grit tapered torpedo diamond
- No. 17l bur
- Red utility wax
Criteria of Tooth Preparation
- Occlusal reduction: Involves depth orientation grooves
- Axial reduction: Placement parallel to the long axis of the tooth, following recommended 6-degree taper
Occlusion Reduction
- Methods for reducing the occlusal surface
- Round-end tapered diamond for creating depth grooves
- Functional and nonfunctional cusps, measuring depth for grooves
Guiding Grooves for Occlusal Reduction
- Placement of depth holes and connecting them
- Guiding grooves in the buccal and lingual development grooves
- Use of guiding grooves for proper occlusal reduction
- High and low points of each cusp, including the triangular ridges on the tooth's surface
Occlusion Reduction (Alternative Descriptions):
- Using a 1.5mm deep depth for functional cusps and 1mm on nonfunctional cusps
- Using enamel chisels can help determine the depth of grooves in the occlusal reduction process
Additional Tooth Preparation Details (Various Aspects)
- Removal of tooth structure between grooves using an inclined manner
- Utilizing round-end tapered diamonds to create orientation grooves on triangular ridges
- Application of functional cusp bevels
- Using no. 17 bur
- Checking occlusal clearance
- Measurement of occlusal clearance using RGS 3, ensuring loose instrument fit
- Placement of seating grooves (0.5mm above chamfer)
- Distinguishing complete full veneer crown preparation, features, functions, and considerations for each
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Description
Test your knowledge on dental crowns with this quiz focusing on full metal crowns, their advantages, indications, and preparation techniques. From understanding noble metals to the specific application of electric pulp testers, see how well you grasp the intricacies of dental crown placement.
