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Function of the universal retainer
To hold the matrix band in position
Components of universal retainer
1. Outer knob
2. Inner knob- controls the size of the loop
3. Spindle
4. Diagonal slot
5. Guide slots
6. Vise
Matrix bands acts as a missing wall
Types of matrix bands (need 4)
- universal
- premolar band
- molar band
- t band
Assembling a matrix band and universal retainer
Equipment and supplies
- basic set up
- universal retainer
- matrix band
- ball burnisher
- paper pad
Procedural steps in order
Rinse and dry the preparation
Examine the outline of the cavity
Determine the size of matrix band
Prepare the band
Hold the retainer, and turn the outer knob
Turn the inner knob until the vise moves
Identify ends of the band together
Slide the joined ends of the band
Guide the band between the correct guide slots and place band
Wedges function
To position a matrix band firmly against the gingival margin of the preparation which in turn helps the band provide the anatomic contour that is required interproximally.
Types of wedges
Wooden
Plastic
Band types
Clear matrix- composite
Metal- amalgam
Wedge is placed from lingual to buccal
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