MDA Chap 49

Main objective of restoring a proximal wall

Answer explanation

• Create a tight contact with the adjacent tooth

• Have good contour of the tooth structure

• Bring back the proper anatomy

system used to hold the dental material and tooth together during the setting process

Besides acting as a temporary wall, the matrix system provides the following features:

Answer explanation

• To stabilize and hold material during the placement

• To hold the dental material during the set-time or curing stage

• To restore interproximal anatomical contours

• To restore the correct interproximal contact with the adjacent tooth

• To create a smooth external surface for the restorative material to be packed against

The two retainer systems used for class II restorations are the tofflemire retainer system and the

• primarily positioned from the buccal surface of the tooth being restored.

• “universal retainer”

• is a mechanical device that holds a matrix band snugly in position

• designed for the placement of class II amalgam restorations and intermediate restorations.

• May use a contra-angle retainer if buccal surface needs a restoration

• A thin, flexible stainless steel material designed to adapt to the natural curve of the tooth

• Used for the placement of amalgam

The two designs of matrix band

Components of a tofflemire and what they do

selected for the class Il preparation when the proximal "box" of the tooth preparation is at a minimum depth and width and the cusps are intact

• Extension band

• universal band

is selected for a class Il preparation with a more extensive preparation that requires gingival extensions to compensate for the loss of a cusp

• Extension band

• universal band