Biomechanical investigation of orthodontic treatment planning based on orthodontic force measurement and finite element method before implementation: A case study

Abstract

BACKGROUND: Orthodontic treatment planning (OTP) is primarily depended on clinical experiences of orthodontists at present, while equivocal OTP would increase the possibility of treatment failure.OBJECTIVE: The objective was to investigate a methodology for quantitatively evaluating OTP, using theoretical analyses, orthodontic forces measurement (OFM) and finite element method (FEM).METHODS: An OTP was theoretically designed based on a clinical case and forces on incisors in OTP were measured on a specialized platform. Further, FEM simulations were performed on the designed OTP and control group. At last, an 18-month tracking was carried out to observe treatment effects of the designed OTP.RESULTS: The moving tendencies of incisors were in keeping with ideal treatment from the designed OTP through FEM; the maximal hydrostatic stress and logarithmic strain in periodontal ligament (PDL) decreased by 26.81% and 32.60% compared to the control group. Clinical feedback indicated that a controllable correction of incisors was realized after 18 months, which was in accord with the FEM result and root/bone resorption by reason of stress/strain reduction on PDL did not occur.CONCLUSIONS: Biomechanical responses of periodontium can be quantitatively estimated using OTM and FEM. This study provided an alternative technological mean for the predictability and optimization of clinical OTP.

Individualization of the three‐piece base arch mechanics according to various periodontal support levels: A finite element analysis

“…Although it is possible to look at several variables in FE simulations, this investigation focused on radial PDL strains. The stress/strain fields in the PDL were indeed proved to have the most significant correlations with the biological responses of bone and root resorption 33‐36 . Not surprisingly, the results of the present FE analyses showed that the PDL strains induced in the periodontally reduced models were generally higher than the PDL strains induced in the intact normal model.…”

“…The stress/strain fields in the PDL were indeed proved to have the most significant correlations with the biological responses of bone and root resorption. [33][34][35][36] Not surprisingly, the results of the present FE analyses showed that the PDL strains induced in the periodontally reduced models were generally higher than the PDL strains induced in the intact normal model. When simulating the intrusive loading scenario, the PDL deformation increased by approximately 10%-40% when the periodontally reduced models were evaluated (Figure 4).…”

“…It is important to point out that not only the maximum and/or minimum values had changed but also the amount of area in the PDL experiencing high strain values. Considering that the compressive strains are usually more dangerous for the support tissues than the tensile strains are, [33][34][35][36] the reduction in the compressed area (blue area) in the periodontally compromised models is a clear indication that the intrusive forces should be reduced in these conditions (Figure 4). The force reduction indicated by the present analysis (−20% to −25%) is similar to the reduction suggested by a previous FE study of intrusion in a periodontally damaged dentition (−30%).…”

Biomechanical performance of an immature maxillary central incisor after revitalization: a finite element analysis

“…For dental trauma, an increased frontal load of 300 N was applied, which is one of the most frequent traumatic events in young patients (da Silva et al , Lam ). However, a mesial orthodontic movement of incisors was simulated with the recommended force of 0.8 N (Wu et al ).…”

Optimization of Loading Condition for Maxillary Molar Intrusion with Midpalatal Miniscrews by Using Finite Element Analysis

“…FE analysis is a numerical method that calculates the stresses and determines the mechanical behavior of complex structures [26]. Recently, the predictability of FE analysis in orthodontic treatment has been validated by evaluation with clinical feedbacks [27]. Thus, we evaluated the loading condition for maxillary molar intrusion with MMEA through FE analysis.…”