Tooth Restoration Methods Quiz

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Questions and Answers

What are two types of materials used for veneers?

Porcelain and acrylic

Composite and porcelain (correct)

Composite and glass ionomer

Ceramic and resin

Which of the following is NOT a benefit of veneers?

High strength against fractures (correct)

Improvement in shape

Conservative approach

Improvement in color

Which procedure does NOT typically require preparation for direct veneers?

Composite applied directly to the teeth (correct)

Porcelain layered over existing structure

Making a splint from a wax-up

Traditional crowns placement

Which of the following is a contraindication for the use of veneers?

Excessive interdental spacing (D) Signup and view all the answers

Which statement is true about indirect veneers compared to direct veneers?

Indirect veneers are usually more accurate in shape. (D) Signup and view all the answers

What is a characteristic of inlays?

They replace proximal and occlusal surfaces only. (A) Signup and view all the answers

Which of the following conditions may indicate the use of veneers?

Discolored teeth (C) Signup and view all the answers

What is one negative aspect of indirect veneers?

They may require tooth preparation. (C) Signup and view all the answers

What is the primary function of a crown in dental restoration?

To fully cover the coronal aspect of the tooth (B) Signup and view all the answers

Which angle represents a bevel on cavo-surface margins for metal onlays?

20-30 degrees (D) Signup and view all the answers

What type of tooth structure is typically prepared with a 4-6 degree tapered wall?

Onlay (A) Signup and view all the answers

Which of the following is NOT an indication for a crown?

Mild tooth sensitivity (C) Signup and view all the answers

What material is commonly used for inlays and onlays?

Ceramic (A) Signup and view all the answers

What can excessive tapering of cavo-surface margins in crown preparation lead to?

Decreased retention (A) Signup and view all the answers

What is the minimum proposed height necessary for molars to be suitable for crown placement?

4 mm (C) Signup and view all the answers

Which of the following is a positive aspect of metal ceramic crowns?

Flexible use (A) Signup and view all the answers

What does an axial shoulder or chamfer reduction of 1 mm refer to?

Preparation for a crown (A) Signup and view all the answers

What is defined as a narrow ribbon-shaped communication between two root canals?

Isthmus (B) Signup and view all the answers

Which of the following is a negative aspect of all ceramic crowns?

Reduced crown strength (A) Signup and view all the answers

What should be measured to evaluate occlusal reduction when preparing teeth for crowns?

At the reduced cusp tips to the opposing fossa or marginal ridge (B) Signup and view all the answers

What are the three general principles of tooth preparation?

Biological, Mechanical, Aesthetic (C) Signup and view all the answers

What is one of the primary advantages of all ceramic crowns?

Provides the best and most natural look (B) Signup and view all the answers

Which situation is contraindicated for the use of all ceramic crowns?

Insufficient healthy tooth structure support (B) Signup and view all the answers

What is a disadvantage of metal ceramic crowns?

Dark metal edge visible at the gumline (A) Signup and view all the answers

For which patient group should zirconia crowns be used with caution?

Patients with metal sensitivities (C) Signup and view all the answers

What is the main aesthetic benefit of E-MAX: Lithium Disilicate crowns?

Looks natural and attractive (B) Signup and view all the answers

What is a key advantage of using composite crowns?

Less reactivity compared to metals (C) Signup and view all the answers

What is a significant disadvantage of zirconia crowns?

May cause allergic reactions (A) Signup and view all the answers

Which crown type is noted for being the weakest restorative material?

Composite crowns (C) Signup and view all the answers

What is the main reason for recommending metal ceramic crowns over all ceramic crowns?

Higher strength and durability (B) Signup and view all the answers

Which statement correctly indicates a use case for E-MAX crowns?

Ideal for both front and back teeth (D) Signup and view all the answers

When should patients suffering from bruxism avoid ceramic or porcelain crowns?

For any front tooth restoration (C) Signup and view all the answers

What is one of the limitations that patients must consider when opting for composite crowns?

Requires frequent replacements (C) Signup and view all the answers

What is a significant disadvantage of all ceramic crowns compared to metal crowns?

Higher risk of fractures (C) Signup and view all the answers

Why might a patient choose PFM crowns over all ceramic crowns?

Better strength and durability (B) Signup and view all the answers

What is a significant advantage of gold crowns in dental restorations?

They allow for easy modification of occlusion. (D) Signup and view all the answers

Which of the following is NOT a contraindication for using gold crowns?

Seeking a highly aesthetic restoration (A) Signup and view all the answers

Which statement correctly describes the total occlusal convergence (TOC) for gold crowns?

A TOC of 4-10 degrees is difficult to achieve clinically. (A) Signup and view all the answers

What characteristic helps achieve resistance in gold crown preparations?

Total occlusal convergence (TOC) (A) Signup and view all the answers

In which scenario would gold crowns be particularly indicated?

For patients with a history of clenching and grinding (D) Signup and view all the answers

What is a disadvantage of gold crowns compared to other restoration types?

Possible allergic reactions in some patients (A) Signup and view all the answers

The functional cusp bevel in gold crown preparations is designed to:

Provide thickness over the functional cusp for strength. (D) Signup and view all the answers

What is a key reason for the conservative tooth preparation associated with gold crowns?

Gold crowns require minimal reduction of tooth structure. (D) Signup and view all the answers

What is an example of a situation where gold crowns would be contraindicated?

An anterior tooth of a young adult. (C) Signup and view all the answers

How do occlusal offset grooves relate to gold crown preparations?

They are generally not necessary for full coverage crowns. (D) Signup and view all the answers

Why might gold crowns lead to initial sensitivity in some patients?

They conduct temperature changes rapidly. (A) Signup and view all the answers

What defines adequate taper in the walls of gold crown preparations?

10-20 degrees is commonly suggested, but more than 5 degrees is not ideal. (D) Signup and view all the answers

Which of the following is an advantage of a complete cast crown preparation?

It has greater retention compared to partial restorations. (B) Signup and view all the answers

In treatment planning, which of the following conditions would suggest a gold crown as a suitable choice?

Managing occlusal wear from heavy grinding habits (D) Signup and view all the answers

What feature enhances the retention form in gold crown preparations?

Greater occluso-gingival height in relation to width (D) Signup and view all the answers

Study Notes

Anterior Tooth Restoration Options

Veneers are a conservative option, potentially requiring no tooth reduction. They improve colour and shape. Types include composite and porcelain.
Crowns (complete) are another option, including metal ceramic crowns (MCC) and all-porcelain crowns.

Posterior Tooth Restoration Options

Composite inlays/onlays are an option.
Porcelain inlays/onlays are another alternative. Partial crowns (excluding metal) are also an option.
Complete crowns (MCC and all-porcelain) are another option.

Veneers - Advantages

Conservative restoration approach
Sometimes no tooth reduction is necessary
Supragingival margins (above the gumline)
Improved colour
Improved shape
Potentially lower cost in some cases

Veneer Types

Direct veneers are applied directly to the tooth, adjusting them easily, but fitting may not be as accurate.
Indirect veneers are more precise but require tooth preparation and are more expensive.

Direct Veneers - Advantages

Easy and quick application
Easily adjustable
No preparation needed
Potentially lower cost for the patient but costly for dentist time
No impressions or lab required

Direct Veneer Construction

Composite is applied directly to the tooth, or a diagnostic wax-up splint is first created.

Indirect Veneers - Advantages and Disadvantages

Advantages: More accurate fitting
Disadvantages: May require preparation, especially for porcelain, and are more expensive.

Composite vs. Porcelain Indirect Veneers

Composite: Easily adjustable, stains, and may be preferred for lower teeth due to heavy loading.
Porcelain: Better aesthetics; less likely to stain, especially for smokers; replacement needed if fracture occurs.

Indications for Veneers

Stained or darkened teeth
Hypocalcification (weak enamel)
Diastemas (gaps between teeth)
Peg laterals (small, pointed teeth)
Chipped teeth
Lingually positioned teeth (teeth that are too far back)
Malposed teeth (without needing orthodontics)

Contraindications for Veneers

Insufficient tooth structure for bonding
Excessive interdental spacing
Poor oral hygiene/caries
Parafunctional habits (clenching, grinding)
Moderate/severe malposition or crowding

Inlays and Onlays - Definitions

Inlay: An intra-coronal restoration (within the crown) that replaces proximal and occlusal surfaces and doesn't cover the cusps.
Onlay: An intra- and extra-coronal restoration (beyond the crown) that replaces proximal surfaces and covers the cusps.

Tooth Preparation for Inlays

Isthmus width 1.5-2mm
Axial walls tapered 4-6 degrees
Flat pulpal floor
Butt-joint cavo-surface margin angle for ceramic
20-30 degree bevel for metal
Rounded line angles
Proximal contact point clearance

Tooth Preparation for Onlays

Isthmus following restoration pattern
Flat pulpal floor
4-6 degree tapered walls
Butt joint for ceramic
Contact points cleared proximally only
Rounded internal angles
Axial shoulder/chamfer (1mm reduction)
Ceramic: functional cusp (2mm reduction), non-functional cusp (1.5mm reduction)
Gold Type III: functional cusp (1mm reduction), non-functional cusp (0.5mm reduction)

Indications for Inlays

Occlusal and/or proximal cavities
Replacement of failed direct restorations

Indications for Onlays

Cusp fractures
Tooth wear
Weakened tooth structures due to caries
Replacing failed restorations with large istmi
Restoration of root canal treated teeth

Inlay/Onlay Materials

Gold
Composite
Porcelain

Crowns - Definition

A complete restoration covering the coronal aspect of the tooth.

Metal Ceramic Crowns (MCCs) - Advantages and Disadvantages

Advantages: Flexible use, good colour match, moderate cost.
Disadvantages: Destructive, opaque.

Tooth Preparation for Crowns

General principles apply for all crown types:
- Flat pulpal floor
- Tapered walls (4-6 degrees)
- Rounded line angles
- Avoidance of undercuts
Ceramic: Functional cusp (2mm reduction), non-functional cusp (1.5mm reduction)
Gold Type III: Functional cusp (1mm reduction), non-functional cusp (0.5mm reduction)
Margin reduction is critical
Minimum height for crowns varies by tooth type (3mm anterior/premolars, 4mm molars).

Indications for Crowns

Cusp fractures
Tooth wear
Caries-weakened tooth structures
Failed restorations with large istmi
Root canal treated teeth restoration
High aesthetic demand
Onlay not possible

Crown Considerations

Measuring gingival extension from bevel to gumline
Occlusal reductions from cusp tips to opposing structures
Margin reduction, maintaining minimal thickness
Overtapered preparations reduce retention
Lips in preparation lead to increased fracture risk and poor fit

All-Ceramic Crowns - Advantages and Disadvantages

Advantages: Best aesthetics for anterior teeth, biocompatible, less temperature sensitivity
Disadvantages: More likely to fracture than metal crowns, may require more tooth reduction, and can be a more expensive option.

Metal Ceramic Crowns (MCCs) - Advantages, Disadvantages, Indications, and Contraindications

Advantages: Excellent aesthetics and durability, lower cost than all-ceramic crowns, durable, good cosmetic option.
Disadvantages: Some opacity, may show dark metal line at gumline, can fracture.
Indications: Matching existing MCCs, better cosmetics than full metal crowns but not suitable for all cases ideal for back or front teeth
Contraindications: Strong sensitivities to metal components or extreme grinding needs

Zirconia Crowns - Advantages, Disadvantages, Indications, and Contraindications

Advantages: Strong, durable, and cosmetically appealing translucent alternative to metal crowns, milled with greater precision.
Disadvantages: Not ideal for veneers or partial restorations, solid zirconia can be challenging to adjust.
Indications: High aesthetic demand, durability required
Contraindications: Specific metal sensitivities

E-MAX Lithium Disilicate Crowns - Advantages and Disadvantages

Advantages: Excellent aesthetics, potentially strong.
Disadvantages: Potential for high cost and some failure reports. Suitable for full crowns (both anterior and posterior)

Composite Crowns - Advantages, Disadvantages, Indications, and Contraindications

Advantages: Soft, less reactive, good for temporary restorations, possibly lower cost.
Disadvantages: Weakest, requires replacement more often
Indications: Patients with extreme metal sensitivities and for interim/temporary placements, or where multiple restorations are needed
Contraindications: Patients who can tolerate more durable materials.

Tooth Preparation Principles

Biologic: Preserve and protect the pulp
Mechanical: Design for strength and retention on the remaining tooth structure
Aesthetic: Achieve the best final result for the patient.

Gold Crowns - Advantages and Indications

Advantages: Durable, wear-resistant, gentle on opposing teeth, ideal for posterior teeth.
Indications: Posterior teeth, heavy clenching/grinding habits, repeated failures of other restorations, retainers for prostheses, minimizing tooth fracture risk, modifications for metal bases.

Gold Crowns - Disadvantages and Contraindications

Disadvantages: Poor aesthetics, potential for allergies/sensitivity to metal, heat/cold sensitivity.
Contraindications: Metal sensitivities, front teeth, extreme sensitivity to heat/cold, certain lifestyles impacting oral health, less necessary situations where a more conservative restoration is appropriate. Preparation parameters required: TOC, taper, resistance form, and retention form.

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Description

Test your knowledge on anterior and posterior tooth restoration options, including veneers and crowns. Explore the various types, advantages, and disadvantages of each method. This quiz covers essential information for dental students and professionals alike.