Effect of Orthodontic Bracket Type and Mouthguard Presence on the Stress and Strain during a Frontal Impact

Abstract

The aim of this study was to analyze the influence of orthodontic bracket type (metallic or ceramic) and mouthguard on biomechanical response during impact. Two-dimensional plane-strain models of a patient with increased positive overjet of the maxillary central incisor was created based on a CT scan, simulating the periodontal ligament, bone support, gingival tissue, orthodontic brackets (metallic or ceramic) and mouthguard. A nonlinear dynamic impact finite element analysis was performed in which a steel object hit the model at 1 m/s. Stress distributions (Von Mises and Modified Von Mises) and strain were evaluated. Stress distributions were affected by the bracket presence and type. Models with metallic and ceramic bracket had higher stresses over a larger buccal enamel impact area. Models with ceramic brackets generated higher stresses than the metallic brackets. Mouthguards reduced the stress and strain values regardless of bracket type. Mouthguard shock absorption were 88.37% and 89.27% for the metallic and ceramic bracket, respectively. Orthodontic bracket presence and type influenced the stress and strain generated during an impact. Ceramic brackets generated higher stresses than metallic brackets. Mouthguards substantially reduced impact stress and strain peaks, regardless of bracket type.

The effect of the simulated aging by thermocycling on the elastic modulus of ethylene‐vinyl acetate brands and stress/strain development during an impact: An in vitro and 3D‐FEA analysis

“…In the literature, studies about indications for replacing mouthguards are sparse. Also, few studies involving orthodontic patients or showing impacts on implant regions have been published 19,20 . However, recent studies have shown that the evaluated mouthguards can also protect teeth restored with crowns, implants, veneers, and other restorative procedures 21,22 …”

“…Also, few studies involving orthodontic patients or showing impacts on implant regions have been published. 19,20 However, recent studies have shown that the evaluated mouthguards can also protect teeth restored with crowns, implants, veneers, and other restorative procedures. 21,22 Studies that present guidelines about the appropriate time for mouthguard replacement are necessary.…”

Protetor Esportivo para Pacientes Ortodônticos: Importância e Técnica de Manufatura

“…Em um estudo utilizando elementos finitos, foi observado que a presença de protetores bucais é eficaz na diminuição de tensões geradas nas estruturas dentais por impacto frontal. No mesmo estudo foi realizada a comparação entre utilização de brackets metálicos ou cerâmicos na distribuição de forças, e foi concluído que brackets metálicos resultaram em menores níveis de tensão nas simulações realizadas (ALVES et al, 2020).…”