An interocclusal record — commonly called a bite registration — is a physical registration of the occluding surfaces of opposing teeth that documents the spatial relationship between the maxillary and mandibular arches at a specific jaw position. This record allows dental casts to be mounted on an articulator that replicates jaw movement, forming the foundation for accurate prosthetic and restorative planning.
Clinical Significance
Precise interocclusal records are essential whenever laboratory technicians or clinicians need to reproduce a patient’s occlusal relationship outside the mouth. Errors in bite registration translate directly into poorly fitting restorations, prostheses requiring extensive chairside adjustment, or temporomandibular joint (TMJ) discomfort.
Common clinical applications include:
- Fabricating fixed prosthetics such as crowns, bridges, and inlays
- Designing removable partial or complete dentures
- Constructing occlusal splints for bruxism or TMJ disorders
- Orthodontic treatment planning and progress monitoring
- Diagnosing occlusal discrepancies or parafunctional habits
Materials and Technique
Several materials are available, each with distinct handling properties:
- Polyvinyl siloxane (PVS) bite registration materials offer excellent dimensional stability and fast set times, making them the current clinical standard.
- Zinc oxide–eugenol (ZOE) pastes provide high rigidity but require longer working times and are contraindicated with certain impression materials.
- Thermoplastic wax is economical and familiar, though susceptible to distortion from temperature changes during transport.
The clinician asks the patient to close into a predetermined jaw position — most often centric relation or maximum intercuspation — while the material polymerizes around the teeth. The finished record accompanies impressions or digital scans to the laboratory.
Accuracy Considerations
The reliability of an interocclusal record depends on capturing a reproducible, stable jaw position. Even slight muscle tension or condylar displacement during registration can alter the vertical dimension of occlusion and compromise the final restoration. Thin, rigid records with minimal tooth separation are generally preferred because they reduce proprioceptive deflection of the periodontal ligament, which can cause the mandible to shift subtly under load.
Clinicians who invest time in a controlled, reproducible bite registration technique consistently reduce laboratory remakes and deliver restorations that seat accurately from the first try.