Biomechanical effects of functional clear aligners on the stomatognathic system in teens with class II malocclusion: a new model through finite element analysis.
Humans
Finite Element Analysis
Malocclusion, Angle Class II
/ therapy
Biomechanical Phenomena
Male
Temporomandibular Joint
/ physiopathology
Adolescent
Mandibular Advancement
/ instrumentation
Masseter Muscle
/ physiopathology
Masticatory Muscles
/ physiopathology
Orthodontic Appliances, Functional
Pterygoid Muscles
/ physiopathology
Cone-Beam Computed Tomography
Temporal Muscle
/ physiopathology
Magnetic Resonance Imaging
Imaging, Three-Dimensional
Orthodontic Appliance Design
Retrognathia
/ therapy
Stomatognathic System
/ physiopathology
Stress, Mechanical
Class II elastics
Finite element analysis
Functional clear aligner
Mandibular advancement
Masticatory muscles
Journal
BMC oral health
ISSN: 1472-6831
Titre abrégé: BMC Oral Health
Pays: England
ID NLM: 101088684
Informations de publication
Date de publication:
29 Oct 2024
29 Oct 2024
Historique:
received:
21
05
2024
accepted:
24
10
2024
medline:
30
10
2024
pubmed:
30
10
2024
entrez:
30
10
2024
Statut:
epublish
Résumé
The Functional Clear Aligner (FCA) is a novel orthodontic appliance designed for the treatment of Class II malocclusion with mandibular retrognathia in adolescents. The aim of this study was to investigate the biomechanical characteristics of the masticatory muscles, jawbone, and temporomandibular joint (TMJ) during mandibular advancement using either FCA or Class II elastics combined with clear aligner (Class II elastics) through finite element analysis. A 3D finite element model of the 'muscle-jawbone-TMJ-appliance' system was constructed based on CBCT and MRI images of a boy with skeletal Class II malocclusion. Masticatory muscles included masseter, temporal, medial pterygoid, and lateral pterygoid muscles. The TMJ consists of the temporal bone's glenoid fossa, disc, and mandibular condyle. To observe the biomechanical characteristics of the muscles and TMJ during orthodontic appliance wearing and the retention phase, two different protocols were used: Model 1: The mandibular advancement using FCA; Model 2: The mandibular advancement using Class II elastics. The FCA group produced greater and more coordinated masticatory muscle forces compared to the Class II elastics group. Temporal and masseter muscles exhibited the most pronounced variation in muscle strength during mandibular advancement. The FCA group exhibited greater TMJ region stress compared to the Class II elastics group. Interestingly, the stress on the articular discs in both models decreased over time. Tensile stresses were observed in both the condyle and the posterior region of the articular fossa. During skeletal Class II malocclusion treatment, masticatory muscle forces and stress on the TMJ were higher in the FCA group compared to the Class II elastics group. In both models, stress cushioning was provided by the articular disc.
Identifiants
pubmed: 39472835
doi: 10.1186/s12903-024-05114-8
pii: 10.1186/s12903-024-05114-8
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
1313Subventions
Organisme : China Oral Health Foundation
ID : A2023-019
Organisme : the National Clinical Research Center for Oral Disease
ID : LCA202202, LCB202202
Organisme : Key Research and Development Program of Shaanxi Province
ID : 2021SF-050, 2022SF-227
Organisme : the CSA Clinical Research Fund
ID : CSA-02022-01
Organisme : College Science and Technology Innovation Plan of Shanxi Education Department
ID : 2021L242
Organisme : New Technologies and New Business of School of Stomatology, Air Force Medical University Fund
ID : LX2022-401
Informations de copyright
© 2024. The Author(s).
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