Cavity Preparation Principles

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Questions and Answers

What is the main purpose of designing the outline of a cavity with minimum exposure to occlusal forces?

To enhance the aesthetic quality of the restoration.

To facilitate quicker restoration procedures.

To reduce the likelihood of restoration failure. (correct)

To increase the size of the cavity for easier filling.

Which of the following is a principal means of retention in cavity preparations?

Pins

Etching

Beveling

Frictional retention (correct)

What is the purpose of creating definite and rounded internal line angles in cavity preparation?

To enhance the color of the restoration.

To minimize the bulk of the restoration.

To maximize tooth sensitivity during procedure.

To reduce stresses on both the restoration and the tooth. (correct)

Which area is NOT considered a stress-bearing area during cavity preparation?

Buccal surface (A) Signup and view all the answers

What is the significance of the occluso-cervical length in cavity retention?

It affects the resistance to lateral displacements. (C) Signup and view all the answers

In cavity preparation, why are grooves or boxes considered auxiliary means of retention?

They provide additional surface area for bonding. (D) Signup and view all the answers

What is the primary goal of finishing and smoothing the enamel margins in cavity restoration?

To ensure a tight marginal seal. (D) Signup and view all the answers

Which of the following is true regarding the removal of caries during cavity preparation?

Soft caries require the use of large blunt low-speed round burs. (A) Signup and view all the answers

What is the primary focus of the resistance form in cavity preparation?

Allowing the restoration to withstand masticatory forces (C) Signup and view all the answers

Which factor does NOT influence the outline form during cavity preparation?

Mechanical principles of occlusion (C) Signup and view all the answers

In cavity preparation, what is the significance of having parallel cavity walls?

They help in distributing occlusal forces evenly. (D) Signup and view all the answers

What aspect of the cavity preparation's outline form helps to facilitate self-cleansing?

Extending margins to areas that can facilitate cleansing (C) Signup and view all the answers

Which of the following principles is most likely to affect the type of materials selected for a restoration?

Esthetics of the restoration (A) Signup and view all the answers

What is a mechanical principle that enhances resistance to occlusal forces during cavity preparation?

Using a flat horizontal surface at a right angle to the occlusal force (C) Signup and view all the answers

In the context of cavity preparation, what is the purpose of debridement?

To remove all remaining decay and debris from the cavity (B) Signup and view all the answers

Which of the following is true about the convenience form in cavity preparation?

It facilitates ease of access for tooth preparation and restoration placement. (B) Signup and view all the answers

Study Notes

Principles of Cavity Preparation

The principles of cavity preparation, outlined by G.V. Black, consist of both mechanical and biological principles.
Mechanical principles involve specific steps in preparing a tooth for a restoration.

Mechanical Principles

Outline Form: This defines the perimeter of the preparation.
- Includes all pits and fissures
- Removes decalcified enamel
- Extends margins to self-cleansing areas
- Avoids seating the restoration on sensitive dentin-enamel junction (DEJ)
- Connects two cavities within 0.5mm
Resistance Form: Provides strength to the prepared tooth and restoration against the forces of mastication.
- Flat horizontal surfaces are more resistant to occlusal forces.
- Box-shape helps resist occlusal forces.
- Inverted truncated forms are more resistant.
- Cavity walls must be parallel.
Retention Form: Prevents the restoration from being displaced or lifted from the prepared tooth.
- Principle means of retention: frictional retention, elastic deformation of dentin, inverted truncated cones, definite point and line angles, depth of the cavity.
- Auxiliary means of retention: grooves, boxes, posts, pins, etching, bevelling.
- Retention can be intracoronal, extracoronal, intraradicular, or extra means of retention.
Convenience Form: Widens the walls of the cavity for convenient access, examination, and restoration.
Removal of Decay: Excavation of soft caries and large blunt low speed round bur for hard, chronic caries.
Finishing Enamel Margins: Smoothing the enamel wall and margin for a marginal seal.

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Description

This quiz covers the fundamental principles of cavity preparation as outlined by G.V. Black. It includes insights into the mechanical principles such as outline form, resistance form, and retention form, essential for creating durable dental restorations. Test your knowledge on these vital concepts in dental education!