prewedging techniques

1. OPERATIVE
DEPARTMENT
TOPIC : What Is Prewedging? In Which Case Do We Do It?
What Are AdvantagesAnd Disadvantages
SUPERVISED BY: Dr. Shahid Islam
PREPARED BY: Maaz

2. Introduction
• Wedges
Types
Shapes & sizes
Placement and location
Techniques
Prewedging
Advantages
Disadvantages

3. Wedge
A small triangular-shaped piece of wood or plastic used to temporarily
separate two teeth or to apply pressure to a matrix band and prevent a
gingival overhang of restorative material when restoring a tooth that has a
cavity involving the proximal surface.

4. Wooden
• Triangular
• Round
Plastic
• Light
transmitting
Wedges

5. Shape & Sizes
WizardWedges (triangular shape)
Premier SycamoreWedges (anatomical
shape)

6. PLACEMENT AND LOCATION OF WEDGES
• A wedge should be positioned as near to the gingivalcavosurface margin as
possible without being occlusal to it.
• Wedge can be inserted buccally or lingually. It depends on cavity preparation and
placement of the band.
• Generally, wedge is inserted from the lingual side as this embrasure is larger in size.
In lower arch as lingual wedge interferes with the tongue, it is placed from the
buccal side. In upper arch it is placed from the palatal aspect.
• Care should be taken to ensure that the wedge is positioned apically in relation to
the gingival cavity wall.
• The gingival wedge should be tight enough to prevent overhanging of the
restoration.

8. WedgingTechniques
SingleWedge
Technique
Piggy Back
Wedging
Double
Wedging
Wedge
Wedging

9. Prewdging
The procedure of inserting a wedge between the interproximal surfaces of two
adjacent teeth prior to cutting a cavity involving a proximal wall.
The purpose is to achieve some tooth separation such that, after restoration,
the teeth will return to their original position and a more positive tooth
contact area will be achieved.

10. Advantages
• Tooth separation obtained from prewedging promotes more conservative
preparation and help protect adjacent teeth from damage during preparation
• Provide space for compensate thickness of matrix band
• Help in stabilization of retainer and matrix during restorative procedures
• Help in retracting and depressing interproximal gingival area thus help in
minimizing trauma to soft tissue.
• Provides space for placing matrix band
• Help in depressing rubber dam in interproximal area and protect it from damage
• Prevent gingival overhang of restoration
• Low cost of development and easy to use

11. Disadvantages
• If wedge is placed more occlusal to the gingival margin, it creates abnormal
concavity in the proximal surface of the restoration.
• If wedge is placed more apical to gingival margin, band will not be held tightly
against the gingival margin & creates gingival overhangs in the restorations.
• When rubber dam cannot be used,care should be takenwhen inserting the wedge
because of the susceptibiltyof the gingiva to bleed upon removal.
• Wedges cannot be placed in the inflamed gingiva as it can cause bleeding.

12. Thank You. . .