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Force System with Vertical V-Bends: A 3D In Vitro Assessment of Elastic and Rigid Rectangular Archwires
Published on: July 24, 2018
Biomechanical Analysis of Customized 3D-Printed Orthodontic Archwires Using Finite Element Modeling and Clinical
Mohammad K Alam1,2,3, Mohammad Y Hajeer4, Nuha A Alsalamah1
1Department of Preventive Dentistry, College of Dentistry, Jouf University, Sakaka, Saudi Arabia.
Background:
Orthodontic treatment success heavily depends on the biomechanical performance of archwires. Conventional nickel-titanium and stainless-steel wires are limited by standardized designs that may not account for individual patient anatomy. Advances in additive manufacturing have allowed for the fabrication of patient-specific archwires using 3D-printing technologies.
Methods:
This prospective, two-phase study included an in silico FEM simulation phase and a clinical validation phase. In the FEM phase, three archwire designs (standard, preformed, and customized 3D-printed) were analyzed under uniform loading conditions. Stress distribution, force-deflection characteristics, and displacement vectors were calculated. In the clinical phase, 30 Class I malocclusion patients were randomly assigned to receive either standard nickel-titanium archwires or customized 3D-printed archwires. Arch alignment efficiency, discomfort (VAS score), and anchorage loss were measured over eight weeks.
Results:
FEM analysis showed significantly lower von Mises stress in customized archwires (68.4 ± 5.2 MPa) compared to standard (96.7 ± 6.1 MPa) and preformed (84.3 ± 4.7 MPa) wires (P < 0.01). Customized archwires exhibited improved force distribution and reduced peak displacement. Clinically, the 3D-printed group achieved 38.2% greater alignment (P = 0.004) with lower VAS scores (3.1 ± 0.7 vs. 5.4 ± 0.9; P < 0.001) and comparable anchorage control.
Conclusion:
Customized 3D-printed orthodontic archwires demonstrated superior biomechanical efficiency and improved patient comfort, suggesting their potential as a next-generation orthodontic tool when guided by FEM design principles.
