# Assessing the Relationship Between the Eichner Index and Articular Eminence Inclination in Temporomandibular Dysfunction: A Cross‐Sectional Study

## TL;DR

This study found a link between tooth loss and changes in the slope of the temporomandibular joint, suggesting the need for dental care to prevent TMJ issues.

## Contribution

The study establishes a novel association between the Eichner Index and articular eminence inclination in TMJ dysfunction.

## Key findings

- A statistically significant relationship exists between the Eichner Index and AEI (p = 0.005).
- Class C patients showed a significantly flatter AEI compared to Classes A and B.
- Tooth loss was found to impact the inclination of the articular eminence.

## Abstract

The articular eminence is essential for the proper functioning of the temporomandibular joint (TMJ), guiding the movement of the mandibular condyle along its posterior slope. Changes in the inclination of the articular eminence (AEI) can occur as a result of tooth loss or aging. The objective of this study was to investigate the association between the AEI and the Eichner Index.

The study analyzed 162 cone beam computed tomography (CBCT) images from patients with TMJ dysfunction. These images were categorized into three groups (A, B, and C) according to the Eichner Index. The posterior surface of the AEI was measured using the top‐roof line method. An ANOVA test was conducted to assess the relationship between the Eichner Index and AEI.

A statistically significant relationship has been found between the AEI and the Eichner Index (p = 0.005). Class C had a significantly lower inclination than Classes A and B.

This study revealed that tooth loss impacts the AEI, with patients who have more missing teeth exhibiting a significantly flatter AEI. To prevent morphological changes and potential future issues in the TMJ, it is essential to ensure proper dental care and maintain occlusal support for these patients.