Fixing the MODJAW Fork on the Patient

Clinical Protocol & Recommended Materials

May 2026

The mandibular fork, designed as a lightweight and adjustable device, plays a key role:
It serves as the support for the mandibular tracker, enabling the recording of the patient’s real jaw movements.

Fundamental Principles of Fixation

Effective fixation relies on simple but essential criteria:

Anatomical adaptation: positioning at the mandibular vestibular area
Stability: the fork must remain perfectly in place
No interference with the occlusal surface

The goal is to achieve a passive, comfortable, and reliable fixation.

Step-by-Step Clinical Protocol

1 – Exposure and Preparation

Use a cheek retractor to improve visibility
Ensure clear access to the bonding surface

2 – Try-in and Fork Adaptation

Before fixation:

Adjust the length if necessary (trim any excess)
Adapt the shape to the vestibular third of the mandibular teeth

3 – Application of the Fixation Material

Apply a controlled amount of material
Position the fork
Hold it in place until complete setting

Place a small amount of material on your glove during application. Once it has hardened on the glove, it is also fully set intraorally.

Which Materials Should Be Used?

Several materials can be used to secure the fork. The choice depends on the desired rigidity, setting time, and clinical situation.

Bi-acrylic Resin (Recommended)

Bi-acrylic resin-based bite registration materials are particularly suitable.

Example:

DUROC by Elsodent

Why this choice?

Fast setting time
Appropriate rigidity
Good stability
Easy handling
Clean removal after use

The DUROC fork fixation material is commonly used for this indication because of its controlled consistency and post-setting stability, helping ensure a reproducible clinical workflow.

Possible Alternatives

Depending on the clinical situation:

Self-curing composite
Temporary cement

The choice depends on the prosthetic context and the clinical indication.

Special Cases

Certain clinical situations require specific adaptations (significant overjet or overbite, extensive restorations, tooth mobility, orthodontics).

For these specific cases, please contact us so we can discuss an adapted protocol.