Dental Crowns and Their Applications

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What is a primary benefit of metal crowns regarding their longevity?

They have improved color matching

They require less tooth preparation

They resist breaking or chipping more than other crowns (correct)

They are easier to adjust

Why might it be challenging to assess tooth vitality using an electrical pulp tester when a metal crown is present?

The metal crown is usually too far from the pulp

The metal reflects the electrical signal

The metal crown interferes with the test (correct)

The metal crown acts as an insulator

Which of the following is a significant drawback of using metal crowns from an esthetic standpoint?

They tend to easily fracture

They are prone to staining

They often cause allergic reactions

They can display a metallic appearance (correct)

What is a primary reason why metal crowns are favored for restoring hidden teeth?

Their superior strength and durability (A) Signup and view all the answers

Why might a dentist need to remove more tooth structure when preparing a tooth for a metal crown compared to a three-quarter crown?

Metal crowns are bulkier and require a different preparation design. (C) Signup and view all the answers

What is a primary reason for placing a full metal crown on a tooth with extensive caries?

To protect the remaining tooth structure from fracture (A) Signup and view all the answers

For which of the following situations is a full metal crown NOT typically indicated?

An anterior tooth with minimal damage and no functional issues (D) Signup and view all the answers

In addition to protecting the tooth structure, what is another purpose of a full metal crown when used with a large amalgam restoration?

To prevent fracture of the remaining tooth and the amalgam (B) Signup and view all the answers

When might a full metal crown be utilized to address issues with tooth anatomy or alignment?

To recontour the tooth, especially for a removable partial denture clasp (D) Signup and view all the answers

In the context of full metal crowns, what does the term 'bridge retainer' refer to?

A crown used as an anchor for a fixed dental prosthesis (B) Signup and view all the answers

A full metal crown is indicated for which of the following situations?

To correct a minor inclination of a tooth. (C) Signup and view all the answers

When would the use of a full metal crown be contraindicated?

In cases where esthetics are a high priority. (D) Signup and view all the answers

Which of the following is a reason to consider not using a full metal crown?

If a more conservative option, such as a 3/4 crown, is applicable. (A) Signup and view all the answers

A patient presents with a high caries index. How does this influence the decision to use a full metal crown?

It is an indication. (B) Signup and view all the answers

Which of these findings would indicate a need for a full metal crown?

The patient needs a slight mesiodistal adjustment. (C) Signup and view all the answers

Which sequence accurately represents the order of tooth preparation?

Occlusal, buccal, lingual, proximal (D) Signup and view all the answers

A coarse-grit round-end tapered diamond bur would most likely be used for which part of tooth preparation?

Initial gross reduction of tooth structure (A) Signup and view all the answers

Which bur is specifically NOT a round-end tapered diamond?

Medium-grit short needle diamond (D) Signup and view all the answers

What is the purpose of the No. 171L bur in tooth preparation?

The text doesn't specify the exact purpose (C) Signup and view all the answers

Which material listed in the armamentarium is NOT a rotary cutting instrument?

Red utility wax (A) Signup and view all the answers

What is the primary purpose of the guiding grooves created in the axial reduction process?

To facilitate the placement of the final restoration. (B) Signup and view all the answers

Why is it important to keep the diamond shank parallel to the proposed path of withdrawal while creating the guiding grooves?

To allow for proper clearance during the crown placement process. (C) Signup and view all the answers

What is the recommended depth of the cuts made by the diamond during axial reduction?

Up to the midpoint of the tooth. (D) Signup and view all the answers

Which of the following is NOT a characteristic of the torpedo diamond used for axial reduction?

It is specifically designed for cutting enamel. (A) Signup and view all the answers

What is the primary purpose of axial reduction in crown preparation?

To reduce the size of the tooth to accommodate the crown. (B) Signup and view all the answers

What is the main goal of occlusal reduction in tooth preparation for a complete cast crown?

To establish depth orientation, grooves, and a geometric incline configuration. (D) Signup and view all the answers

Which of the following best describes the ideal orientation of axial reduction relative to the tooth?

Parallel to the long axis of the tooth. (C) Signup and view all the answers

What is the recommended degree of taper or included convergence for axial reduction in tooth preparation?

6 degrees. (C) Signup and view all the answers

Which location is preferred for the preparation margin when preparing a tooth for a complete cast crown?

Supra-gingival. (A) Signup and view all the answers

What is the purpose of a functional cusp bevel?

To provide space for the opposing cusp and avoid occlusal interference. (A) Signup and view all the answers

Where are depth holes initially placed when preparing guiding grooves for occlusal reduction?

In the central, mesial, and distal fossae. (D) Signup and view all the answers

What is the primary purpose of creating a functional cusp bevel?

To protect the centric or functional cusp. (D) Signup and view all the answers

According to the guidelines, which tool is recommended for creating depth orientation grooves during occlusal reduction?

A round-end tapered diamond. (B) Signup and view all the answers

Guiding grooves are created by carving the tooth on which of the following locations?

In the buccal and lingual developmental grooves and on each triangular ridge. (C) Signup and view all the answers

Where are the low points typically located when marking the height of the cusps?

In the central and developmental grooves. (C) Signup and view all the answers

In the context of occlusion reduction, what does 'removal of tooth structure between the grooves in an inclined manner' describe?

A method designed to eliminate interferences (B) Signup and view all the answers

What is a specific instrument mentioned in 'description 2' for planar occlusal reduction?

A no. 17 bur (A) Signup and view all the answers

What kind of instrument is used in 'description 2' to achieve a planar occlusal reduction?

A round tapered diamond bur (B) Signup and view all the answers

What does removing tooth structure between grooves in an 'inclined manner' suggest about the reduction?

It is beveled across the tooth structure (C) Signup and view all the answers

In the provided descriptions, which approach involves using instruments that appear slender and pointed?

Description 2, for planar reduction (A) Signup and view all the answers

What is the primary purpose of the instrument described in axial reduction?

To create a chamfer finish line (B) Signup and view all the answers

During the facial axial reduction procedure, what should be avoided to protect adjacent teeth?

Nicking or damaging (A) Signup and view all the answers

Which part of the tooth does the torpedo diamond reduce in the axial reduction procedure?

Buccal surface (C) Signup and view all the answers

What type of finish line is created during the buccal reduction using the instrument?

Chamfer finish line (D) Signup and view all the answers

How far should the instrument be moved into the interproximal embrasures during facial axial reduction?

As far as possible (B) Signup and view all the answers

What is the primary motion used when operating the short thin needle diamond during proximal reduction?

Up-and-down motion (B) Signup and view all the answers

Which of the following actions is NOT part of the proximal reduction procedure?

Applying pressure with a pivoting motion (D) Signup and view all the answers

When working in tight areas during proximal reduction, how should the short thin needle diamond be utilized?

Utilizing the tip of the instrument (A) Signup and view all the answers

What is the initial step in the procedure for proximal reduction using the diamond instrument?

Placing the instrument against the tooth structure (D) Signup and view all the answers

What is the purpose of sweeping the diamond instrument during proximal reduction?

To effectively reshape the tooth structure (D) Signup and view all the answers