Dental Assisting Chapter 49 Quiz & Flashcards

Questions and Answers

What cavity classifications use a posterior matrix system? (Select all that apply)

Class IV (correct)

Class I

Class III (correct)

Class II (correct)

What is the plural of matrix?

Matrices

What is used to hold a posterior matrix band in place intraorally?

Universal retainer aka the Tofflemire retainer

When a matrix band is placed on the tooth, where is the smaller circumference of the band placed?

Towards the gingiva Signup and view all the answers

What instrument is commonly used to contour the matrix band?

The burnisher or the end of a mirror handle Signup and view all the answers

What additional item is used in the matrix system to reestablish proper contact with an adjacent tooth?

Wedges Signup and view all the answers

What can result from improper wedge placement?

Overhang or cupping Signup and view all the answers

Why can't a stainless steel matrix band be used with composites?

Composite resins have inorganic filler particles that can be scratched or marked by stainless steel. Composites can also cause the materials to set improperly. Signup and view all the answers

What is another term for clear plastic matrix?

Celluloid strip or mylar strip Signup and view all the answers

What matrix system is an alternative to the universal retainer?

Automatrix system Signup and view all the answers

What type of matrix system uses a spot welder to fuse the ends together?

The spot welded band Signup and view all the answers

What is another term for a thin polished matrix band used for posterior composites?

Palodent type matrix band Signup and view all the answers

Study Notes

Posterior Matrix Systems

Class II, III, & IV cavity classifications utilize a posterior matrix system.
To hold a posterior matrix band intraorally, a universal retainer, also known as a Tofflemire retainer, is employed.

Matrix Band Placement

The smaller circumference of the matrix band is positioned towards the gingiva when placed on the tooth.
Common instruments for contouring the matrix band include a burnisher or the end of a mirror handle.

Wedge Usage

Wedges are incorporated in the matrix system to restore proper contact with adjacent teeth.
Improper placement of wedges can lead to complications such as overhang or cupping.

Material Compatibility

Stainless steel matrix bands are unsuitable for use with composites because the inorganic filler particles can mark or scratch the band, potentially affecting the setting of the materials.

Types of Matrix

Clear plastic matrices are also referred to as celluloid strips or mylar strips.
An alternative to the universal retainer is the automatrix system.

Specialized Matrix Systems

The spot welded band matrix system employs a spot welder to fuse the ends together.
The palodent type matrix band is a thin, polished matrix band specifically designed for posterior composites.

Description

Test your knowledge on Chapter 49 of Modern Dental Assisting with these recall flashcards. Focused on key concepts like cavity classifications and matrix definitions, this quiz will help reinforce your understanding of essential dental assisting terminology.