When is it used?
For example, when a matrix is used for a filling on a side surface of a tooth.
← All explanationsInterdental wedge
What does an interdental wedge do during a filling?
An interdental wedge is a small aid temporarily placed between neighbouring teeth by the clinician. For a filling on the side of a tooth, it helps adapt and stabilise a matrix band near the gum margin. It may also contribute to slight separation of the teeth. Its size, shape and interaction with the matrix must suit the particular situation.
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A side wall needs a form
When decay has removed part of a side wall, a matrix band temporarily contains the filling material. Adaptation at the deeper margin is particularly important.
The wedge helps adaptation
A suitable wedge sits between the teeth below the contact area. It helps adapt the matrix at the cervical margin. Depending on the system, a separating ring may also be used.
Checking after shaping
The wedge and matrix are removed during treatment. Checks then include the shape of the margin and contact with the neighbouring tooth. The wedge does not remain as part of the filling.
Read the full explanation
A side wall needs a form
When decay has removed part of a side wall, a matrix band temporarily contains the filling material. Adaptation at the deeper margin is particularly important.
The wedge helps adaptation
A suitable wedge sits between the teeth below the contact area. It helps adapt the matrix at the cervical margin. Depending on the system, a separating ring may also be used.
Checking after shaping
The wedge and matrix are removed during treatment. Checks then include the shape of the margin and contact with the neighbouring tooth. The wedge does not remain as part of the filling.
Notes on the teaching images
- Matrix defines the side wall
- Pale wedge below the contact area
- Auxiliary devices are removed again
At a glance
Does it stay in the mouth?
No. It is removed during the course of treatment.
What is checked afterwards?
The filling margin and contact with the neighbouring tooth, among other features.
Knowledge in motion
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Silent educational film with German on-screen text and simplified teaching images. Not a patient case or a promised treatment outcome. The full English explanation is available as text.
Often confused
Often confused: wedge and matrix
The matrix temporarily contains the filling material. The wedge supports its adaptation between the teeth. They have different functions.
Quick answers
Is it an aid for everyday cleaning?
No. A filling wedge is a clinical instrument. It does not replace floss or a suitably sized interdental brush and is not intended for self-placement.
Why does size matter?
An unsuitable wedge may fail to adapt the matrix or distort it unfavourably. Selection depends on the space, the cavity and the matrix system.
Does it prevent every overhanging filling margin?
No. It supports shaping but does not replace assessment of the whole restoration. The matrix, material handling and access also affect the result.
At the practice
For the appointment
You can bring this question to your appointment:
How will the contact with the neighbouring tooth and a cleanable margin be checked for my filling?
If a filling is planned or food becomes trapped between teeth after treatment, you can have the contact area assessed.
Discuss your findingsAppointment selection at DoctolibLearning layer for training & practiceUnderstand terminology and deepen knowledge
- Cervical margin
- The edge of a restoration towards the tooth neck or gum.
- Contact area
- The area where neighbouring teeth meet and where the completed restoration needs an appropriate shape.
Make the distinction
The matrix temporarily contains the filling material. The wedge supports its adaptation between the teeth. They have different functions.
Sources and context
Editorial research: . General information, not an individual diagnosis or treatment recommendation. Teaching illustrations are simplified and do not depict a patient case.