# Is the mandibular buccal shelf anatomy related to craniofacial morphology? A cross-sectional CBCT study

## TL;DR

This study examines the anatomy of the mandibular buccal shelf and its relation to craniofacial features using CBCT scans.

## Contribution

The study quantifies mandibular buccal shelf dimensions and their associations with age, facial pattern, and skeletal class.

## Key findings

- Bone thickness and depth increased in distal areas of the mandibular buccal shelf.
- Bone thickness decreased with age and was lower in hyperdivergent patients.
- No significant differences in bone thickness were found between sexes or skeletal classes.

## Abstract

The placement of Temporary Anchorage Devices (TADs) in the mandibular buccal shelf area is a common option for distalizing the lower arch. Therefore, the study of bone thickness and depth in this area is mandatory before planning TAD insertion. The aim of this study was to quantify the width and depth of the mandibular buccal shelf structure and examine its associations with sex, age, skeletal class and vertical pattern.

A cross-sectional study was carried out on cone beam computed tomographies obtained from 91 patients. The bone thickness was evaluated in the mandibular buccal shelf area 5 and 8 mm apical to the cement-enamel junction (CEJ), and the bone depth was measured 4 mm buccal to the CEJ at the level of the distal root of the mandibular first molar and the mesial root of the mandibular second molar using the InVivoDental 6.0 software.

The depth and thickness of the bone increased in distal areas, and the thickness was greater at 8 mm. No differences were found between sex or skeletal class. Bone thickness decreased with age, and it was significantly lower in hyperdivergent patients.

The thickness of the bone was higher in distal and deeper areas, and the depth was greater in distal areas. The hyperdivergent facial pattern and age were negatively associated with bone thickness.

Key words:Temporary anchorage devices (TADs), mandibular external oblique line, cone beam computed tomography (CBCT), buccal shelf.