Behavior of the association between an oral protector and a polyamide reinforcement mesh in impact absorption at anterior maxillary region. In silico and in vitro analysis

Author(s)

Talita Suelen de Queiroz

• Document type: Master's Dissertation
• Press: São José dos Campos. 2023-05-11.
• Institution: Universidade Estadual Paulista (Unesp). Instituto de Ciência e Tecnologia. São José dos Campos
• Defense date: 2023-02-15
• Advisor: Tarcisio José de Arruda Paes Júnior; João Paulo Mendes Tribst

Abstract

This study evaluated in vitro and in silico dentoalveolar responses in central incisors to trauma in the anterior region of the maxilla, using mouthguards (MG) reinforced with polyamide mesh in three different locations. The study groups were divided into skull with conventional PB in EVA (ethylene vinyl acetate) with 4 mm thickness; PB in 4mm thick EVA (control) with reinforcement at 1mm (Mg 1+3), 2mm (Mg 2+2) and 3mm (Mg 3+1) from the vestibular limit. In the in vitro study, a skull model was printed in Spin Red Resin - Quanton 3D covering the maxillary region and teeth individually in Resilab Clear - Wilcos resin and the periodontal ligament was simulated in addition silicone. To measure the microdeformations, extensometers were placed in the alveolar process of the maxilla and in the center of the crowns of teeth 11th and 21th, parallel to their long axis. The BP were produced in EVA with reinforcements according to each group (n=10). The impact was performed by a specific machine developed, applying Ep=0.5496 J of energy, with force within the elastic limit of the skull material in the horizontal direction parallel to the ground and perpendicular to the contact surface of the 35mm sphere. In the in silico study, the four groups were modeled and analyzed by dynamic explicit analysis, simulating impact through a steel sphere with 35mm in diameter and 7.8 g/cm³ of density at 1m/s with all conditions similar to the in vitro study. The materials were considered isotropic, homogeneous and linear. The contacts followed the same physical conditions of the in vitro test (frictional and glued). Meshes were defined with tetrahedrons after 10% convergence. The main maximum deformations and stresses in the teeth and in the maxilla were presented in colorimetric graphs. The data obtained from the in vitro study were submitted to the Shapiro-Wilk, Kruskal-Wallis and Dunn's multiple comparison test (5% significance). The results show a statistical difference for the group without reinforcement in relation to the other groups (p = 6.8x10-5), in relation to the microdeformations (με) in the different areas of impact, it was not possible to observe a statistical difference (p = 0.879). The results of the finite element analysis corroborated the in vitro study by extensometry, which allows validation of theoretical and practical models for future analysis. (AU)

• FAPESP's process: 21/11159-7 - BEHAVIOR OF THE ASSOCIATION BETWEEN AN ORAL PROTECTOR AND A POLYAMIDE REINFORCEMENT MESH IN IMPACT ABSORPTION AT ANTERIOR MAXILLARY REGION. IN SILICO AND IN VITRO ANALYSIS
• Grantee: Talita Suelen de Queiroz
• Support Opportunities: Scholarships in Brazil - Master