Pure Mandibular Incisor Intrusion: A Finite Element Study to Evaluate the Segmented Arch Technique

Leveling the curve of Spee is a commonly-used strategy to correct deep bites. Although several techniques have been proposed to intrude mandibular incisors (MI), flaring of these teeth is often observed and in many instances undesired. A three-dimensional (3D) finite element model (FEM) was used to...

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Bibliographic Details
Published in:Materials 2019-08, Vol.12 (17), p.2784
Main Authors: de Brito, Gabriela Meyge, Brito, Hélio Henrique de Araújo, Marra, Gabriel Goulart Mendes, Freitas, Laíze Rosa Pires, Hargreaves, Bernardo Oliveira, Magalhães, Jr, Pedro Américo Almeida, Oliveira, Dauro Douglas
Format: Article
Language:English
Subjects:
Boundary conditions
Brackets
Finite element method
Intrusion
Mechanics
Orthodontics
Software upgrading
Stainless steels
Teeth
Three dimensional models
Titanium
Tubes
Wire
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Summary:Leveling the curve of Spee is a commonly-used strategy to correct deep bites. Although several techniques have been proposed to intrude mandibular incisors (MI), flaring of these teeth is often observed and in many instances undesired. A three-dimensional (3D) finite element model (FEM) was used to locate the ideal point of force application (PFA) to achieve pure MI intrusion with the three-piece arches' technique. It comprised (1) a 0.021 × 0.025 in. stainless steel (SS) wire that passively filled the slots of the canine and premolar brackets and the first and second molar tubes, bilaterally; (2) a 0.0215 × 0.0275 in. SS intrusion base arch (IBA) inserted into the MI brackets, that presented a step down distal to the lateral incisors brackets and a posterior extension arm; (3) titanium-molybdenum tip-back springs designed to apply the intrusion force, fitted inside the first molar gingival tube. Four PFA on the IBA were simulated (FEM 1, 2, 3, and 4). FEM 3 resulted in pure MI and was considered the ideal PFA. FEM1 and 2 showed intrusion and buccal crown flaring of the MI, whereas FEM4 resulted in intrusion and lingual crown flaring of those teeth. Clinicians may consider three-piece arch mechanics to achieve pure MI intrusion. However, they must be aware that when force was applied anteriorly or posteriorly to the ideal PFA, the incisors would incline labially or lingually, respectively.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma12172784