Title: Module 5 - Matrices
Course: DEH 2530 Expanded Duties > Section: Module 5 - Matrices

Introduction

Severely damaged teeth, whether from dental caries or trauma, pose unique challenges to the restorative dentist. One challenge is confining the restorative filling material in a badly mutilated tooth during the procedure. This situation is particularly acute when using amalgam as a restorative, though it is present in the case of composite resin and glass ionomer restorations, as well. Matrices were developed as a temporary means of confining and shaping the restorative material. Placement and removal of a matrix is considered an expanded function in the state of Florida that can be delegated to a trained dental auxiliary.

In this module, we will focus primarily on the Tofflemire retainer and matrix, its indications for use and the procedural steps for its application and removal. In addition, alternate matrix systems will be presented and described with the situations that benefit from their utilization.

Objectives

Upon completion of this module, the student will be able to:

- Discuss the purpose of the matrix, Tofflemire retainer and wedge.
- Name two styles of Tofflemire matrix retainers and their uses.
- Identify the parts of a Tofflemire retainer and the function of each part.
- List the characteristics of a well-placed matrix.
- List the steps for placement and removal of a matrix, retainer and wedge.
- Discuss alternate forms of matrices and their indications for use.

Readings & Resources

Robinson, Debbie, Doni Bird. Essentials of Dental Assisting, 5th Edition. Saunders, 2013. Chapter 21, pages 329-332 and 334-6 and video

Matrix Band Placement - http://www.columbia.edu/itc/hs/dental/operative/matrixband.html

UMichigan Packing of Class II Amalgam for Hygienists - https://www.youtube.com/watch?v=gyRWF90d8pU  This excellent 70’s era video demonstrates the use of the Tofflemire retainer and matrix in the placement of a class II amalgam restoration.

Triodent V3 Sectional Matrix System - https://www.youtube.com/watch?v=GB7Wy4OSaNk  This animation demonstrates one of the many alternate matrix systems that have been introduced in the last 30 years, many providing far better results than the standard Tofflemire retainer and matrix band.

Assignments & Activities
- Post in the Module 5 Discussion board
- Complete the Module 5 Presentation Assignment
- Complete the Module 5 Quiz