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Muscles of the Anterior Neck

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The anterior neck muscles are the group of muscles covering the front part of the neck. These muscles are classified into three subgroups. The first one is the superficial muscles, the most visible muscles in the front of the neck. It includes the platysma and sternocleidomastoid. The second group is the suprahyoid muscles, located above the hyoid bone. This group comprises the digastric, mylohyoid, geniohyoid, and stylohyoid. Lastly, the infrahyoid muscles are found below the hyoid bone and...

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Updated: Sep 3, 2025

A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible

A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible

Published on: January 28, 2020

Exploring the mylohyoid area as a reference for three-dimensional digital mandibular superimposition.

A Oueiss¹, J Camia¹, C Masucci¹

¹Nice University Hospital, France; Côte d'Azur University, Nice, France; Department of orthodontics and dentofacial orthopedics, faculty of dentistry, Nice, France.

Journal of Stomatology, Oral and Maxillofacial Surgery

|July 30, 2022

Summary

The mylo-hyoid area provides an accurate method for superimposing 3D digital dental casts of the mandible in orthodontic treatment. This technique shows no significant difference compared to traditional 2D cephalograms for evaluating tooth movement.

Keywords:

Digital cast Mandible superimposition Mylo-hyoid line Three-dimensional

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Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment

Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment

Published on: February 23, 2024

Area of Science:

Orthodontics
Dental Imaging
Biomedical Engineering

Background:

Accurate quantification of tooth movements is crucial in orthodontics.
Cone Beam Computed Tomography (CBCT) is established for maxillary superimposition, but mandibular superimposition methods require further definition.
Traditional methods include teleradiographs and casts, with limitations in 3D analysis.

Purpose of the Study:

To evaluate the accuracy of the mylo-hyoid area as a reference landmark for three-dimensional (3D) superimposition of mandibular Digital Dental Casts (DDC).
To compare 3D DDC superimposition using the mylo-hyoid area with conventional 2D lateral cephalograms for assessing orthodontic tooth movement.

Main Methods:

A comparative study involving 30 orthodontic patients.
3D mandibular overlays were created using the mylo-hyoid area as a reference.
Coordinates of molars and incisors from 3D superimposition were compared with those from 2D lateral cephalograms using paired t-tests.

Main Results:

No statistically significant differences were found between the mylo-hyoid area-based 3D DDC superimposition and the 2D lateral cephalogram method.
Sagittal and vertical displacements of lower first molars and central incisors showed comparable results between the two methods.

Conclusions:

The mylo-hyoid area is a reliable and accurate landmark for 3D superimposition of the mandible in orthodontic treatment.
This 3D superimposition method is applicable to patients with conventional orthodontic records.
Further research on larger populations and diverse subgroups is recommended.