# Morphometrıc evaluatıon of patıents wıth mandıbular hypomobılıty due to coronoıd process hyperplasıa usıng cone beam computed tomography

## TL;DR

This study uses cone beam CT to analyze jaw joint restrictions caused by coronoid process hyperplasia and identifies key anatomical factors affecting mouth opening.

## Contribution

The study introduces new morphometric parameters to assess the impact of coronoid process hyperplasia on jaw mobility.

## Key findings

- Significant differences in CP length and related ratios were found between patients and controls.
- The CP-MP angle and D distance were identified as influential factors in mouth opening restriction.
- Bilateral CPH patients showed asymmetry in the Cr-MP angle.

## Abstract

Mandibular hypomobility is a condition in which the jaw joint is restricted due to various causes, including temporomandibular joint disorders (TMD), ankylosis, head and neck infections and tumors, coronoid processes hyperplasia (CPH), and trismus. The aim of this study is to evaluate the relationship between the coronoid processes (CP) of patients diagnosed with CPH and other anatomical structures and to investigate how this affects temporomandibular hypomobility.

The study included cone beam computed tomography (CBCT) images of 10 patients diagnosed with mandibular hypomobility due to bilateral CPH and 30 healthy individuals who underwent CBCT for other reasons (implant placement, impacted teeth, etc.). CBCT sections were used to measure condyle length (H1), CP length (H2), CP length over the zygomatic arch (H3), ramus length (H4), horizontal distance between CP and zygomatic arch (D), and the angle between CP and the mandibular plane (MP).

A statistically significant difference was found between the mean Cr-MP angles on the right and left sides in the study group (p = 0.031). Significant differences were observed between the study and control groups in H2, H2/H1, H3, H3/H2, H2/H4, and D distance measurements (p < 0.001). Additionally, a significant difference in the CP-MP angle was found between the groups (p = 0.003).

Our study demonstrates that, in addition to CP length, factors such as the H2/H1 ratio, CP-MP angle, D distance, and H3 also influence mouth opening restriction.