Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Symmetry01:26

Symmetry

153
The equation of an ellipse centered at the origin defines all points whose distances from the center maintain a constant ratio between the horizontal and vertical axes. This equation results in a smooth, closed curve that extends further along the x-axis than the y-axis, giving it a horizontal orientation. Such an ellipse demonstrates three kinds of symmetry: across the x-axis, across the y-axis, and about the origin. These symmetries are essential in understanding the graph's structure and...
153
Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

799
Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
799
Rotation of Asymmetric Top01:11

Rotation of Asymmetric Top

1.5K
By definition, a spherically symmetric body has the same moment of inertia about any axis passing through its center of mass. This situation changes if there is no spherical symmetry. Since most rigid bodies are not spherically symmetric, these require special treatment.
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...
1.5K
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

525
Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
525
Unsymmetric Loading of Thin-Walled Members01:23

Unsymmetric Loading of Thin-Walled Members

382
Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
The concept of the shear center is crucial in countering the...
382
Unsymmetric Bending01:18

Unsymmetric Bending

756
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The...
756

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Genomic records in dental practice and education.

British dental journal·2026
Same author

Correction to: Alloplastic TMD joint reconstructions.

British dental journal·2026
Same author

Alloplastic TMD joint reconstructions.

British dental journal·2026
Same author

Does simultaneous alloplastic temporomandibular joint reconstruction affect the accuracy of Le Fort I osteotomy?

International journal of oral and maxillofacial surgery·2026
Same author

Does preoperative joint space affect accuracy in splint-based Le Fort I osteotomy?

International journal of oral and maxillofacial surgery·2026
Same author

Validation of surface-based registration for genioplasty osteotomies: comparison with regional voxel-based registration.

International journal of oral and maxillofacial surgery·2026
Same journal

CAD/CAM-guided total condylar remodelling for the management of active mandibular condylar hyperplasia.

International journal of oral and maxillofacial surgery·2026
Same journal

Differential fibular bone mineral density changes following maxillary versus mandibular reconstruction: a cohort study.

International journal of oral and maxillofacial surgery·2026
Same journal

Effect of platelet-rich fibrin derivatives on tissue healing and postoperative complications following mandibular third molar surgery: a systematic review and meta-analysis of randomized controlled trials.

International journal of oral and maxillofacial surgery·2026
Same journal

Assessment of temporomandibular joint-related arteries by three-dimensional rotational angiography.

International journal of oral and maxillofacial surgery·2026
Same journal

Gender disparities in research trial leadership within oral and maxillofacial surgery.

International journal of oral and maxillofacial surgery·2026
Same journal

Factors that worsen nasal ventilation after Le Fort I osteotomy with superior repositioning.

International journal of oral and maxillofacial surgery·2026
See all related articles

Related Experiment Video

Updated: Jan 9, 2026

Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion
08:19

Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion

Published on: January 15, 2016

9.2K

Head orientation method affects symmetry assessment.

M D Han1, S Graca2

  • 1Department of Oral and Maxillofacial Surgery, University of Illinois Chicago College of Dentistry, Chicago, IL, USA.

International Journal of Oral and Maxillofacial Surgery
|December 2, 2025
PubMed
Summary
This summary is machine-generated.

Orthognathic surgery planning relies on head orientation. Hard and soft tissue methods yield different symmetry assessments, potentially impacting surgical outcomes.

Keywords:
Computer-assisted three-dimensional imagingDentofacial deformitiesFacial asymmetryMalocclusionOrthognathic surgery

More Related Videos

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
07:24

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane

Published on: August 22, 2025

455
Using Unidirectional Rotations to Improve Vestibular System Asymmetry in Patients with Vestibular Dysfunction
05:02

Using Unidirectional Rotations to Improve Vestibular System Asymmetry in Patients with Vestibular Dysfunction

Published on: August 30, 2019

7.7K

Related Experiment Videos

Last Updated: Jan 9, 2026

Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion
08:19

Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion

Published on: January 15, 2016

9.2K
Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
07:24

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane

Published on: August 22, 2025

455
Using Unidirectional Rotations to Improve Vestibular System Asymmetry in Patients with Vestibular Dysfunction
05:02

Using Unidirectional Rotations to Improve Vestibular System Asymmetry in Patients with Vestibular Dysfunction

Published on: August 30, 2019

7.7K

Area of Science:

  • Orthodontics and Dentofacial Surgery
  • Medical Imaging Analysis

Background:

  • Head orientation is crucial for orthognathic surgery planning, establishing the reference frame for assessment.
  • Hard tissue-based (HT) and soft tissue-based (ST) methods are common, but their effect on symmetry evaluation is not well understood.

Purpose of the Study:

  • To investigate the impact of HT and ST head orientation techniques on symmetry assessment in orthognathic surgery patients.

Main Methods:

  • Retrospective analysis of 57 patients undergoing orthognathic surgery.
  • Preoperative CT scans were oriented using both HT and ST methods.
  • Comparison of maxillary dental midline (U1) and pogonion (Pog) positions and roll.

Main Results:

  • Significant differences were observed in symmetry assessments between HT and ST methods.
  • Median roll difference was 0.64°, and mediolateral position differences were 0.9 mm (U1) and 1.2 mm (Pog).
  • Both methods demonstrated excellent reliability (ICC > 0.974).

Conclusions:

  • HT and ST head orientation methods produce differing symmetry assessments in orthognathic surgery.
  • These discrepancies can lead to clinically significant deviations, necessitating careful consideration by clinicians.
  • Balancing the pros and cons of each method is vital for appropriate surgical workup.