Full Metal Crown Preparation Quiz

What is the definition of a full metal crown restoration?

• A. A metal restoration that covers only the occlusal surface of a tooth

• B. A metal restoration that covers all aspects of a prepared abutment

• C. A ceramic restoration that covers the entire tooth structure

• D. A composite restoration that covers the proximal surfaces of a tooth

What are the indications for using a full metal crown?

• A. High esthetic need exists

• D. Whenever treatment objectives can be met with a more conservative restoration

• C. Short clinical crowns

• B. Extensively damaged tooth

What is one of the advantages of a full metal crown?

• C. Easy modification of occlusion

• A. Great retention and resistance

• D. Allows pulp vitality testing

• B. High esthetics

Why is preservation of tooth structure important in restorative dentistry?

• B. To reduce the harmful pulpal responses

• A. To increase the risk of pulp injury

• D. To decrease the retention and resistance of the restoration

• C. To create a more esthetic restoration

What is the recommended degree of taper on the axial walls for optimum retention and resistance in full metal crown preparation?

• B. 4 degrees

• D. 8 degrees

• C. 6 degrees

• A. 2 degrees

Why is structural durability important in a full metal crown restoration?

• A. To increase the risk of perforation during function

• D. To decrease the retention and resistance of the restoration

• B. To withstand the forces of occlusion

• C. To allow for easy modification of axial walls

What is the main disadvantage of a sub-gingival finish line in full metal crown preparation?

• C. Allows for better evaluation of margins

• B. Increases the ease of finishing and cleaning

• D. Decreases the risk of recurrent caries

• A. Causes periodontitis

What is the purpose of the functional cusp bevel in occlusal reduction?

• B. To increase the risk of perforation

• A. To decrease the restoration bulk

• D. To avoid axial reduction errors

• C. To provide enough restoration bulk at areas of heavy occlusal contact

Why is the finish line of a full metal crown recommended to be located supra-gingivally?

• D. To decrease the risk of recurrent caries

• C. To allow for easy cleaning and finishing

• B. To increase the risk of periodontitis

• A. To make it difficult to evaluate margins

What is the purpose of the wax technique in occlusal clearance checking?

• C. To smooth out unwanted ripples

• A. To evaluate the amount of reduction

• D. To avoid axial reduction errors

• B. To check occlusal clearance in maximum intercuspation