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Dental Wedge

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Dental Equipment & Materials Dental Glossary

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Dental Wedge

A dental wedge is a small, tapered instrument — triangular in cross-section — inserted into the gingival embrasure between two adjacent teeth to stabilize a matrix band, displace soft tissue, and help recreate a tight interproximal contact during restorative procedures.

How It Works

When restoring a proximal surface with composite resin or amalgam, the clinician wraps a matrix band around the tooth to serve as a temporary wall for missing tooth structure. The wedge is then inserted from the buccal or lingual embrasure, pressing the base of the band firmly against the gingival margin of the preparation. This contact prevents restorative material from extruding subgingivally, compensates for the slight thickness of the band itself, and ensures the final restoration has an appropriate contact with the neighboring tooth — a critical factor in preventing food impaction and protecting the periodontal ligament.

Types and Materials

Wedges are available in several forms to accommodate varying embrasure shapes and clinical needs:

  • Wooden wedges (commonly birchwood): slightly compressible and moisture-absorbing, they expand over time to form a tighter seal against the matrix band.
  • Plastic wedges: rigid and available in multiple sizes, often color-coded; they provide consistent pressure without deforming.
  • Anatomic or contoured wedges: designed with a curved profile to better adapt to the natural concavities of the proximal root surface.
  • Pre-wedging: a technique where the wedge is placed before the matrix band is seated, gently separating teeth to offset the band thickness and facilitate a tighter final contact.

Clinical Significance

Proper wedge selection and placement directly affect restoration quality. An undersized wedge may fail to seal the gingival margin, allowing a proximal overhang — a ledge of excess material that traps plaque and irritates gingival tissue. An oversized wedge placed too aggressively can traumatize the interdental papilla or cause unintended tooth separation. Clinicians evaluate embrasure width, proximal box depth, and tissue contour before choosing a wedge and seating any matrix system.

Selecting and placing the correct wedge is a small technical step with lasting consequences for contact integrity, gingival health, and overall restoration longevity.