Maximum intercuspation

A typodont showing maximum intercuspation.

Maximum intercuspation (MI), also known as the intercuspal position (ICP), is the occlusal position of the jaws where the cusps of the teeth of both arches fully interdigitate with the opposing teeth. This position is considered the most stable and reproducible position of the dental arches and is often used as a reference point in dentistry.

Anatomy and Physiology

In maximum intercuspation, the maxillary and mandibular teeth come into full contact, allowing for the distribution of occlusal forces across the dental arches. This position is crucial for maintaining occlusal stability and ensuring efficient mastication.

The occlusal surfaces of the teeth are designed to fit together in a specific manner, with the cusps of the teeth fitting into the fossae of the opposing teeth. This precise alignment helps in distributing the forces of chewing evenly across the teeth, reducing the risk of tooth wear and temporomandibular joint (TMJ) disorders.

Clinical Significance

Maximum intercuspation is an important concept in prosthodontics, orthodontics, and restorative dentistry. It serves as a reference point for:

• Designing dental prostheses such as crowns, bridges, and dentures.
• Planning orthodontic treatment to ensure proper alignment and occlusion of the teeth.
• Diagnosing and managing occlusal disorders and TMJ dysfunction.

Differences from Centric Relation

It is important to distinguish maximum intercuspation from centric relation (CR). While MI is a tooth-determined position, CR is a bone-determined position where the condyles are in their most anterior-superior position in the glenoid fossae, independent of tooth contact. In some individuals, MI and CR coincide, but in others, there may be a discrepancy between these two positions.

Related Pages

• Occlusion (dentistry)
• Centric relation
• Temporomandibular joint disorder
• Dental anatomy
• Orthodontics