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

Q: A matrix must be used to create a temporary wall for which of the following classifications of tooth restoration?
- class I and class V
- class II and class IV
- class II and class III
- both B and C
A: both B and C

Q: A wedge is required on each proximal surface that is to be restored, regardless of whether there is an adjacent tooth present.
- True
- False
A: False

Q: For posterior restorations, the wedge is positioned from the ________ side
- facial
- buccal
- lingual
- labial
A: lingual

Q: The _____ matrix is used for anterior composite resin or glass ionomer restorations.
- automatrix
- clear plastic
- Tofflemire
- T-band
A: clear plastic

Q: The most common matrix system used for class II posterior restorations is the _____.
- Tofflemire retainer and matrix band
- clear plastic matrix
- T-band matrix
- automatrix system
A: Tofflemire retainer and matrix band

Q: The size of the _________ determines the size and shape of the wedge
- cavity preparation
- operator's hands
- embrasure
- assistant's hands
A: embrasure

Q: The universal, or Tofflemire, retainer holds the matrix band snugly in position and is most often positioned _____.
- toward the anterior of the mouth
- on the buccal surface of the tooth being restored
- on the lingual surface of the tooth being restored
- toward the posterior of the mouth
A: on the buccal surface of the tooth being restored

Q: When a posterior metal matrix band and retainer are placed, the seated matrix band should extend approximately _____ mm below the gingival margin of the preparation
- 1
- 3
- 6
- -2 (it should actually be above the margin of the gingival preparration)
A: 1

Q: Which of the following statements is true of posterior metal matrix bands?
- The smaller circumference of the band is the occlusal edge.
- The smaller circumference is placed towards the gingiva.
- The larger circumference of the band is the gingival edge.
- The edge of the band is contoured in the proximal contact area
A: The smaller circumference is placed towards the gingiva.

Q: You should use a __________ to contour the metal matrix band at the contact area.
- mouth mirror handle
- cotton pliers
- Howe pliers
- burnisher
A: burnisher