Sturdevant 6th Edition Chapter 5 Tooth Preparation Quiz

What is the primary objective of tooth preparation?

To remove all defects and protect the pulp
To form the tooth preparation so that the tooth or restoration will not fracture under mastication forces
To allow for the esthetic and functional placement of a restorative material
All of the above (correct)

Which wall of the cavity is formed only by dentin?

Pulpal wall (correct)
External wall
Internal wall
Axial wall

What is the purpose of the external wall of the cavity preparation?

To be parallel to the long axis of the tooth
To extend the prepared surface to the external tooth surface (correct)
To be perpendicular to the long axis of the tooth
To provide protection to the pulp

What is the primary function of the axial wall in a tooth preparation?

To be parallel to the long axis of the tooth (D) Signup and view all the answers

What is the purpose of the internal walls in a tooth preparation?

To not extend to the external tooth surface (D) Signup and view all the answers

Which step in tooth preparation is considered the initial step?

Altering the defective, injured, or diseased tooth (D) Signup and view all the answers

What is the purpose of the pulpal wall in a tooth preparation?

To be perpendicular to the long axis of the tooth and occlusal of the pulp (A) Signup and view all the answers

Which tooth structure forms the walls of the cavity, except for the pulpal floor?

Both enamel and dentin (B) Signup and view all the answers

What is the main purpose of the initial tooth preparation stage STEP 2: PRIMARY RESISTANCE FORM?

To preserve the strength of cusps and marginal ridges (A) Signup and view all the answers

Why is it important to have a slight rounding of internal line angles in the tooth preparation?

To reduce stress concentrations in the tooth structure (D) Signup and view all the answers

What is the purpose of rounding the external (axiopulpal) line angles within the tooth preparation?

To reduce the stress on some restorative materials (C) Signup and view all the answers

What is the typical feature of the initial depth of the tooth preparation?

Preparing a relatively horizontal pulpal wall of uniform depth (C) Signup and view all the answers

Which of the following is NOT a typical feature of establishing proper outline form and initial depth in the tooth preparation?

Maximizing faciolingual extensions (A) Signup and view all the answers

How does connecting two close features help the tooth resist occlusal loading?

It is at right angles to the forces of mastication directed in the long axis of the tooth (C) Signup and view all the answers

What is the purpose of restricting the extension of the external walls in the tooth preparation?

To allow strong cusp and ridge areas to remain with sufficient dentin support (D) Signup and view all the answers

What is the main purpose of the initial tooth preparation stage?

To establish proper outline form and initial depth (B) Signup and view all the answers

What is the cavosurface angle?

The angle of tooth structure formed by the junction of a prepared wall and the external surface of the tooth (D) Signup and view all the answers

What is an external line angle?

A line angle whose apex points away from the tooth (B) Signup and view all the answers

What is the purpose of the initial tooth preparation stage?

To reach the peripheral sound tooth structure (D) Signup and view all the answers

What should be done to resist fracture of the tooth or restorative material from masticatory forces?

Place and orient preparation walls correctly (C) Signup and view all the answers

What is an internal line angle?

The angle that points into the tooth (A) Signup and view all the answers

Which principle involves extending the restoration conservatively?

Providing necessary protection to the pulp (D) Signup and view all the answers

What does a point angle represent?

A junction of three planal surfaces (A) Signup and view all the answers

Which stage involves cleaning of the cavity?

Mechanical principles stage (C) Signup and view all the answers

What is the purpose of reducing and covering weak cusps during initial tooth preparation in extensive tooth preparations?

To prevent or resist fracture of the tooth (C) Signup and view all the answers

When should cusp reduction be considered during initial tooth preparation according to the text?

When the outline form has extended half the distance from a primary groove to a cusp tip (B) Signup and view all the answers

What is the minimal occlusal thickness for amalgam needed for appropriate resistance to fracture according to the text?

1.5 mm (D) Signup and view all the answers

Which design feature enhances primary resistance form during tooth preparation?

Box-like shape (D) Signup and view all the answers

What is recommended for internal line angles during tooth preparation to enhance primary resistance form?

Rounded internal line angles (C) Signup and view all the answers

In what shape should the gingival wall (floor) be prepared in the proximal portion of conventional Class II preparations?

Horizontal and relatively perpendicular to forces (D) Signup and view all the answers

What should be included within the restoration in extensive tooth preparations according to the text?

Enough of a weakened tooth structure (C) Signup and view all the answers

What guides the reduction of cusps during initial tooth preparation?

The distance from a primary groove to a cusp tip (B) Signup and view all the answers

What is the primary purpose of the primary retention form in tooth preparation?

To prevent displacement or removal of the restoration by tipping or lifting forces (C) Signup and view all the answers

How does the primary retention form differ between amalgam and composite restorations?

Amalgam relies on external convergent tooth walls, while composites rely on micromechanical bonding (B) Signup and view all the answers

What is the main purpose of the convenience form in tooth preparation?

To provide adequate observation, accessibility, and ease of operation in preparing and restoring the tooth (B) Signup and view all the answers

What is an example of a convenience form procedure?

Extending proximal preparations beyond proximal contacts (C) Signup and view all the answers

Which of the following is NOT a principle of the primary retention form?

The primary retention form should provide adequate thickness of the restorative material (B) Signup and view all the answers

What is the main difference between the primary retention form and the convenience form in tooth preparation?

The primary retention form is for ensuring adequate thickness of the restorative material, while the convenience form is for providing access and ease of operation (A) Signup and view all the answers

Which of the following is NOT a principle of the primary retention form for amalgam restorations?

Creating a micromechanical bond between the restoration and tooth structure (B) Signup and view all the answers

What is the primary purpose of the micromechanical bond in composite restorations?

To retain the composite restoration in the tooth (B) Signup and view all the answers

How does the convenience form differ between amalgam and composite restorations?

There is no difference in the convenience form between amalgam and composite restorations (B) Signup and view all the answers

What is the main difference between the primary retention form and the convenience form in terms of their objectives?

The primary retention form is for preventing displacement or removal of the restoration, while the convenience form is for providing adequate access and ease of operation (B) Signup and view all the answers