Year: 2025
Type: conference-paper
Abstract: The pathogenesis of temporomandibular disorders (TMD) stems from the biomechanical coupling of osseous structures, articular disc viscoelasticity, and muscular coordination. This study established a high-fidelity 3D temporomandibular joint (TMJ) model to systematically quantify the dynamic displacement inhibition mechanism of disc degeneration during staged mandibular opening. Three biomechanically distinct phases were analyzed: initial rotation-dominant phase (5°), transitional phase (12.5°), and terminal translation-dominant phase (20°). Progressive disc degeneration was simulated by modulating elastic modulus (10–150 MPa) and Poisson's ratio (0.4–0.25). Results revealed a phase-dependent cumulative inhibition effect: terminal-phase condylar displacement suppression (5.58%–13.1%) exceeded initial-phase values by 3.6-fold, while incisal point inhibition increased from 1.37%–4.63% (initial) to 5.01%–11.8% (terminal). Crucially, bilateral coordination stability (DL-R fluctuation <0.001 mm) persisted across all phases despite exponentially amplified displacement constraints, indicating TMJ's compensatory optimization of force transmission. These findings establish a critical threshold (12.5° opening angle) for accelerated degradation effects and provide biomechanical criteria for TMD staging and early intervention.
Authors: Jun Zhou, Wen Tang, Lizhe Xie, Ke Chen
Institutions: Southeast University, Nanjing Medical University
Language: English
Subfield: Complementary and Manual Therapy
Field: Health Professions
Domain: Health Sciences
Open Access status: hybrid
Funder: Government of Jiangsu Province
OpenAlex ID: W4413008137