Prosthetic Dentistry II: Impression and Boxing

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Questions and Answers

What is the purpose of border molding in dental impressions?

To create a master impression for prosthesis

To shape the residual ridge areas

To replicate the contour and size of the vestibule (correct)

To apply a layer of rubber base adhesive

Which materials are commonly used for final impressions in dentistry?

Plaster and pumice

Wax and plaster mixture

Rubber base adhesive

Zinc oxide eugenol impression paste (correct)

What is the purpose of a definitive cast in dentistry?

To create rounded notches on the bottom of the master cast

To replicate the residual ridge areas

To pour plaster into a wax container

To fabricate a prosthesis (correct)

What is the wax boxing method used for in dentistry?

Creating a dental cast by applying and sealing wax to the impression to form a container Signup and view all the answers

What is the process of cast pouring in dentistry?

Carefully preparing and pouring a dense mix of yellow stone into the impression to create a cast Signup and view all the answers

What is done during mandibular impression in dentistry?

Applying a layer of rubber base adhesive or hot sticky wax to create a land area, then boxing with plaster and pumice or wax to create an enclosure Signup and view all the answers

What is the purpose of marking the anticipated final extensions of the denture with a red pencil on the cast?

To identify areas for tray extension Signup and view all the answers

What is the function of a spacer in impression making?

To provide room for the impression material Signup and view all the answers

What is the purpose of applying separating media on the cast?

To prevent acrylic resin from sticking to the cast Signup and view all the answers

What is the composition of separating media used to prevent acrylic resin from sticking to the cast?

$\text{Sodium Alginate} + \text{calcium sulfate} = \text{insoluble calcium alginate}$ Signup and view all the answers

What is the purpose of trimming the tray periphery to be 2-3 mm thick with rounded edges?

To provide room for impression material Signup and view all the answers

What is the role of tray handles in impression making?

Facilitating loading, placing, and orienting custom trays in mouth Signup and view all the answers

What is meant by 'undercut' in dental prosthesis?

The contour of a cross-sectional portion of a residual ridge that prevents insertion of a dental prosthesis Signup and view all the answers

What is recommended when blocking out undercuts with modeling wax?

Apply separating media on cast before blocking out undercuts Signup and view all the answers

What should be done with black pencil markings on the tray extension?

They indicate areas for tray extension Signup and view all the answers

What do finger rests assist with during impression making?

Loading, placing, and orienting custom trays in mouth Signup and view all the answers

Study Notes

Border Molding: shaping the borders of dental impressions using low fusing compound, elastomeric materials, or manual manipulation of soft tissues to replicate the contour and size of the vestibule.
Final Impression: an impression that represents the completion of the registration of the surface or object, used as a master impression for creating a prosthesis.
Materials for Final Impression: zinc oxide eugenol impression paste, elastomeric impression materials.
Definitive Cast: a replica of the residual ridge areas and other parts of the dental arch used to fabricate a prosthesis.
Wax Boxing Method: a technique for creating a dental cast by applying and sealing wax to the impression to form a container, then pouring plaster into the wax container.
Plaster of Paris and Pumice Method: a technique for creating a dental cast by setting the impression in a mixture of plaster and pumice, then wrapping the impression in wax and pouring plaster into the wax container.
Cast Pouring: carefully preparing and pouring a dense mix of yellow stone into the impression to create a cast.
Mandibular Impression: applying a layer of rubber base adhesive or hot sticky wax to the impression to create a land area, then boxing the entire impression with plaster and pumice or wax to create the enclosure.
Cast Trimming: trimming the cast to ensure proper fit within the denture flask, and creating rounded notches on the bottom of the master cast for remounting the processed denture onto the articulator.
Technique Videos: available for border molding, wax and plaster pumice boxing, and fabricating a master cast using dental stone.

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Description

Test your knowledge on impression and boxing in prosthetic dentistry with this quiz. Learn about marking anticipated final extensions of the denture and tray extension techniques.