Cavosurface Angle: Final Stages of Tooth Preparation Quiz and Flashcards

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Questions and Answers

What is the primary purpose of finishing the external walls of a tooth preparation?

To minimize the risk of tooth sensitivity

To create a smooth surface for the restoration (correct)

To ensure a proper fit of the restoration

To increase the strength of the restoration

When is beveling of the cavosurface angle recommended for an amalgam restoration?

Always, to improve the aesthetics of the restoration

On the gingival floor of a Class II preparation when enamel is still present (correct)

On the occlusal surface to increase the strength of the restoration

Beveling is never recommended for amalgam restorations

What is the recommended cavosurface angle for amalgam and ceramic restorations?

A 90-degree angle (correct)

A beveled angle

A 45-degree angle

A 60-degree angle

What is the primary factor that determines the design of the cavosurface angle?

The restorative material being used Signup and view all the answers

What is the secondary feature of finishing the external walls of a tooth preparation?

The degree of smoothness or roughness of the wall Signup and view all the answers

What is the primary purpose of removing remaining enamel pits, fissures, infected dentin, or old restorative material during the final tooth preparation stage?

All of the above Signup and view all the answers

Which of the following conditions would not necessitate the removal of old restorative material during the final tooth preparation stage?

Radiographic evidence indicates no caries under the old material Signup and view all the answers

What is the purpose of placing liners and bases during the final tooth preparation stage?

To protect the pulp and aid in pulpal recovery Signup and view all the answers

If the periphery of the remaining old restorative material is intact, what should be done during the final tooth preparation stage?

Leave the old restorative material in place Signup and view all the answers

During the final tooth preparation stage, what should be done if radiographic evidence indicates caries under the old restorative material?

Remove the old restorative material Signup and view all the answers

What are the two types of secondary retention and resistance forms mentioned in the text?

Mechanical preparation features and micromechanical treatments Signup and view all the answers

Which of the following is NOT mentioned as a factor contributing to pulpal irritation during or after operative procedures?

Improper isolation techniques Signup and view all the answers

What is the ideal method for removing any remaining enamel pit or fissure, infected dentin, or old restorative material?

Using a round carbide bur with air coolant and slow speed Signup and view all the answers

What is the purpose of secondary resistance and retention forms in tooth preparation?

To enhance the retention of the restorative material Signup and view all the answers

Which of the following statements about mechanical preparation features is NOT true according to the text?

They involve etching and priming of the preparation walls Signup and view all the answers

Which of the following factors should be considered when removing remaining enamel, dentin, or restorative material?

Minimizing frictional heat and maintaining instrument control Signup and view all the answers

Which of the following is the correct order of steps in the initial tooth preparation stage?

Step 1: Outline form and initial depth, Step 2: Primary resistance form, Step 3: Primary retention form, Step 4: Convenience form Signup and view all the answers

What is the purpose of Step 5 in the final tooth preparation stage?

To remove any remaining infected dentin or old restorative material Signup and view all the answers

Which of the following statements about carious dentin is true?

Carious dentin consists of two distinct layers: an outer infected layer and an inner affected layer Signup and view all the answers

What is the purpose of Step 8 in the final tooth preparation stage?

To create procedures for finishing external walls Signup and view all the answers

Which of the following is the correct order of steps in the final tooth preparation stage?

Step 5: Removal of remaining dentin/material, Step 6: Pulp protection, Step 7: Secondary resistance and retention forms, Step 8: Procedures for finishing walls, Step 9: Final procedures Signup and view all the answers

What is the purpose of Step 9 in the final tooth preparation stage?

To perform the final procedures of cleaning, inspecting, and desensitizing Signup and view all the answers

What is the recommended procedure for beveling the gingival floor in a Class II preparation when enamel is still present?

Do not bevel the gingival floor Signup and view all the answers

If a preparation extends onto the root surface (no enamel present), what should the root-surface cavosurface angle be for amalgam and composite restorations?

90 degrees Signup and view all the answers

When is beveling enamel margins indicated for composite preparations?

Primarily for larger restorations that have increased retention needs and increased surface area for bonding Signup and view all the answers

Which of the following is the usual procedure for cleaning a tooth preparation?

Free the preparation of visible debris with water from the syringe, then remove visible moisture with air bursts Signup and view all the answers

Which solution may be used for disinfecting a tooth preparation?

Chlorhexidine (2 wt%) Signup and view all the answers

What is the recommended angle for the root-surface cavosurface when preparing a tooth for an amalgam restoration?

90 degrees Signup and view all the answers

Study Notes

Tooth Preparation Stages

Initial tooth preparation stage consists of 4 steps: outline form and initial depth, primary resistance form, primary retention form, and convenience form.

Final Tooth Preparation Stage

Consists of 5 steps: removal of remaining infected dentin or old restorative material, pulp protection, secondary resistance and retention forms, finishing external walls, and final procedures.

Removal of Remaining Infected Dentin or Old Restorative Material

Definition: Elimination of any infected carious tooth structure or faulty restorative material left in the tooth after initial tooth preparation.
Conditions for removal: affecting esthetic result, compromising retention, radiographic evidence of caries, symptomatic tooth pulp, or periphery of remaining old restorative material is not intact.

Pulp Protection

Definition: Placement of liners and bases to protect the pulp or aid pulpal recovery or both.
A step in adapting the preparation for receiving the final restorative material.

Secondary Resistance and Retention Forms

Mechanical preparation features (amalgam) and micromechanical treatments (composite).
No bevels are placed at the cavosurface margin.

Finishing External Walls

Design of cavosurface angle depends on the restorative material being used.
90-degree cavosurface angle produces maximal strength for amalgam and ceramic materials.
Beveling is contraindicated except on the gingival floor of a Class II preparation when enamel is still present.
Beveling enamel margins in composite preparations is indicated for larger restorations with increased retention needs and surface area for bonding.

Final Procedures

Cleaning: freeing the preparation of visible debris with water and removing moisture with air.
Disinfection: using Chlorhexidine (2 wt%) solutions.
Inspection and desensitizing.

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Description

Learn about the final stage of tooth preparation in dental restoration, which involves the removal of any remaining enamel pit or fissure, infected dentin, or old restorative material. Understand the conditions that indicate the need for removal of old restorative material for successful restoration outcomes.

Dental Restoration: Final Stage Tooth Preparation