Korean J Orthod.  2024 Sep;54(5):316-324. 10.4041/kjod23.261.

Dentoalveolar effects of open-bite correction with the dual action vertical intra-arch technique: A finite element analysis

• Barros SE
• Chiqueto K
• Alberton F
• Cevallos KJ
• Faria J
• Heck B
• Machado L
• Noritomi P

• KMID: 2559820
• DOI: http://doi.org/10.4041/kjod23.261

Abstract

Objective
To evaluate tooth displacement and periodontal stress generated by the dual action vertical intra-arch technique (DAVIT) for open-bite correction using three-dimensional finite element analysis.
Methods
A three-dimensional model of the maxilla was created by modeling the cortical bone, cancellous bone, periodontal ligament, and teeth from the second molar to the central incisor of a hemiarch. All orthodontic devices were designed using specific software to reproduce their morpho-dimensional characteristics, and their physical properties were determined using Young’s modulus and Poisson’s coefficient of each material. A linear static simulation was performed to analyze the tooth displacements (mm) and maximum stresses (Mpa) induced in the periodontal ligament by the posterior intrusion and anterior extrusion forces generated by the DAVIT.
Results
The first and second molars showed the greatest intrusion, whereas the canines and lateral incisors showed the greatest extrusion displacement. A neutral zone of displacement corresponding to the fulcrum of occlusal plane rotation was observed in the premolar region. Buccal tipping of the molars and lingual tipping of the anterior teeth occurred with intrusion and extrusion, respectively. Posterior intrusion generated compressive stress at the apex of the buccal roots and furcation of the molars, while anterior extrusion generated tensile stress at the apex and apical third of the palatal root surface of the incisors and canines.
Conclusions
DAVIT mechanics produced a set of beneficial effects for open-bite correction, including molar intrusion, extrusion and palatal tipping of the anterior teeth, and occlusal plane rotation with posterior teeth uprighting.

Keyword

Finite element method; Orthodontic mini-implant; Openbite; Orthodontic appliance design

Figure

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  Figure 1 Finite element model of a hemimaxilla. The model fixation region is shown in red and the symmetrical boundary condition is in white.

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  Figure 2 A, DAVIT activation for posterior intrusion and anterior extrusion. B, Davit is a skeletally anchored orthodontic device made of 0.017 × 0.025-inch rectangular titanium-molybdenum alloy wire, which is attached to fixed orthodontic appliance by cross-tubes. C, Biomechanical model generated to simulate the DAVIT action. DAVIT, dual action vertical intra-arch technique.

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  Figure 3 Total three-dimensional tooth displacement produced by dual action vertical intra-arch technique biomechanics. Warm colors indicate greater displacement; cold colors indicate smaller displacement (mm).

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  Figure 4 Tooth displacement. A, z-axis: positive values indicate extrusion displacement (mm); negative values indicate intrusion displacement (mm). B, x-axis: positive values indicate buccal displacement (mm); negative values indicate lingual displacement (mm). C, y-axis: positive values indicate distal displacement (mm); negative values indicate mesial displacement (mm).

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  Figure 5 Stress distribution produced by dual action vertical intra-arch technique mechanics in the periodontal ligament. Positive values indicate tensile stress (MPa); negative values indicate compressive stress (MPa). A, Occlusal view. B, Apical view. C, Buccal view. D, Palatal view.

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