# Comparison of linear distance of glenoid fossa to frontomaxillary nasal suture in skeletal Class-II and skeletal Class-I malocclusion

## TL;DR

This study compares jaw measurements in two types of dental misalignment to identify differences in a specific bone landmark position.

## Contribution

The study identifies the GF-FMN distance as a diagnostic indicator for skeletal Class-II malocclusion.

## Key findings

- Class-II malocclusion showed a 3.2 mm more distal glenoid fossa position compared to Class-I.
- GF-FMN distance was significantly larger in Class-II (73.4 mm) than Class-I (70.2 mm) malocclusion.
- GF-FMN is an effective measurement for assessing glenoid fossa position in malocclusion diagnosis.

## Abstract

To compare linear distance of glenoid fossa to frontomaxillary nasal suture in skeletal Class-I and II malocclusions.

This cross-sectional study was conducted at the Department of Orthodontics, Altamash Institute of Dental Medicine, Karachi Pakistan. The duration of study was one year from January, 2019 to January, 2020. After taking informed consent from patient and hospital ethical committee a total of 60 patients were included in the study using WHO sample size calculator. Two groups comprising 30 patients each i.e., Skeletal Class-I malocclusion and Skeletal Class-II malocclusion with mandibular retrusion both having normal vertical relationship were included in the study. The cephalometric measurements SNA, SNB, SNMP, FHMP, GF-FMN, CO-GO, CO GN on lateral cephalograms were measured and compared between the two groups. Independent t test was applied and p value ≤ 0.05 was considered as significant.

In skeletal Class-I malocclusion the mean linear distance of GF-FMN was 70.2 ± 4.02 mm and in skeletal Class-II malocclusion it was 73.4 ± 4.04 mm (p value .004). Glenoid fossa was 3.2 mm distally placed in patients with Class-II malocclusion.

Glenoid fossa position is a diagnostic feature of Class-II malocclusion associated with mandibular retrusion. One of the effective cephalometric measurements to check glenoid fossa position is the distance from the glenoid fossa(GF) to the frontomaxillary nasal suture FMN (GF-FMN).