Dental Cast and Die Preparation Quiz

What should a Master Cast reproduce?

What should the unprepared teeth be free of on the Master Cast?

What must be present on the Master Die to help establish correct cervical contour of the restoration?

What is important for the Master Die?

What should the Master Die provide adequate access to?

What should the Deﬁnitive Cast reproduce?

What must the Deﬁnitive Cast allow for in the occlusal surfaces of unprepared teeth?

What is the main reason why stone is stronger than plaster?

Which type of stone is best for polyether or polyvinyl impression materials?

What is the main difference between Type IV and Type V stone?

Why is vacuum mixing required for Type IV and Type V stone?

Which type of plaster is used for mounting casts in the lab?

What is the main reason for the weakness of plaster compared to stone?

What is the primary use of Type IV High-strength, Low-expansion stone?

What is the main advantage of stone over plaster in terms of mixing?

Master Cast and Die Requirements

A Master Cast should accurately reproduce the prepared teeth and surrounding tissues.
The unprepared teeth on the Master Cast should be free of wax, debris, and other obstructions.
The Master Die must have a rounded, smooth, and continuous cervical area to help establish the correct cervical contour of the restoration.

Master Die Requirements

The Master Die should provide adequate access to the margin for finishing and inspection.
The Master Die is important for accurate Marginal adaptation and fit of the final restoration.

Definitive Cast Requirements

The Definitive Cast should accurately reproduce the unprepared teeth and surrounding tissues in high detail.
The Definitive Cast must allow for precise registration of the occlusal surfaces of the unprepared teeth.

Stone and Plaster Properties

Stone is stronger than plaster because of its lower water-to-powder ratio and higher compressive strength.
Type III stone (dental stone) is best for polyether or polyvinyl impression materials.
The main difference between Type IV and Type V stone is their compressive strength, with Type V having a higher compressive strength.

Mixing and Applications

Vacuum mixing is required for Type IV and Type V stone to minimize air bubbles and maximize strength.
Type I plaster is used for mounting casts in the laboratory.
The main reason for the weakness of plaster compared to stone is its higher water-to-powder ratio and lower compressive strength.
Type IV High-strength, Low-expansion stone is primarily used for fabricating dentures and other restorations that require high accuracy and detail.
The main advantage of stone over plaster is its more consistent and predictable mixing properties.

Test your knowledge of dental cast and die preparation with this quiz. Explore topics such as master, definitive, and working casts, as well as the reproduction of prepared and unprepared tooth surfaces. Perfect for dental students and professionals looking to sharpen their skills.