Influence of custom‐made and stock mouthguard thickness on biomechanical response to a simulated impact

Tribst, João Paulo Mendes; Bottino, Marco Antônio

doi:10.1111/edt.12432

Cited by 65 publications

(172 citation statements)

References 25 publications

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“…A full skull model was selected from the database 18 and exported in STEP format to a computer-aided-design software (Rhinoceros Version 5.0 SR8, McNeel North America, Seattle, WA, USA). The maxilla was isolated with a transversal plane in the region of the anterior nasal spine.…”

Section: Methodsmentioning

confidence: 99%

Does the prosthesis weight matter? 3D finite element analysis of a fixed implant-supported prosthesis at different weights and implant numbers

et al. 2020

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PURPOSE. This study evaluated the influence of prosthesis weight and number of implants on the bone tissue microstrain. MATERIALS AND METHODS. Fifteen (15) fixed full-arch implant-supported prosthesis designs were created using a modeling software with different numbers of implants (4, 6, or 8) and prosthesis weights (10, 15, 20, 40, or 60 g). Each solid was imported to the computer aided engineering software and tetrahedral elements formed the mesh. The material properties were assigned to each solid with isotropic and homogeneous behavior. The friction coefficient was set as 0.3 between all the metallic interfaces, 0.65 for the cortical bone-implant interface, and 0.77 for the cancellous bone-implant interface. The standard earth gravity was defined along the Z-axis and the bone was fixed. The resulting equivalent strain was assumed as failure criteria. RESULTS. The prosthesis weight was related to the bone strain. The more implants installed, the less the amount of strain generated in the bone. The most critical situation was the use of a 60 g prosthesis supported by 4 implants with the largest calculated magnitude of 39.9 mm/mm, thereby suggesting that there was no group able to induce bone remodeling simply due to the prosthesis weight. CONCLUSION. Heavier prostheses under the effect of gravity force are related to more strain being generated around the implants. Installing more implants to support the prosthesis enables attenuating the effects observed in the bone. The simulated prostheses were not able to generate harmful values of peri-implant bone strain.

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Section: Methodsmentioning

confidence: 99%

Does the prosthesis weight matter? 3D finite element analysis of a fixed implant-supported prosthesis at different weights and implant numbers

et al. 2020

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“…Wearing a mouthguard during sports reduces the risk of dental injury via absorbing impact forces, and the effectiveness and safety of the mouthguard are closely linked to the mouthguard material and thickness . Custom mouthguards are mainly fabricated from thermoplastic elastomer sheets, and although the method is relatively simple, the reduction in mouthguard thickness is a drawback .…”

Section: Introductionmentioning

confidence: 99%

Movement of model position just before vacuum forming to ensure mouthguard thickness: Part 2 Effect of model moving distance

Takahashi

Bando

2019

Dental Traumatology

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Background/Aim Wearing a mouthguard during sports reduces the risk of dental injury via absorbing impact forces, and the effectiveness and safety of the mouthguard are closely linked to the mouthguard material and thickness. The aim of this study was to clarify the suppression effect of the thickness reduction of the mouthguard when changing the moving distance of the model forward in a stepwise manner. Materials and Methods Ethylene‐vinyl acetate sheets of 4.0 mm thick and a vacuum forming machine were used. The working model was placed at a position 40 mm from the front of the forming unit. The sheet was softened until it sagged 15 mm, and the sheet frame was lowered and covered the model. The model was then pushed from the back to move it forward, and the vacuum was switched on. The model was moved 10 (MP‐10), 20 (MP‐20), or 30 mm (MP‐30). The control model was not moved. The thickness after formation was measured with a specialized caliper. Differences in the mouthguard thickness caused by the forming conditions were analyzed by one‐way ANOVA and Bonferroni's multiple comparison tests. Results Significant differences were observed between the control and each MP condition (P < 0.01). Reduction rate of the thickness decreased as the moving distance of the model increased. In particular, the thickness difference depending on the forming conditions was greater at the labial site. The reduction rate of MP‐30 was 33.8 ± 0.8% smaller than that of the control. Conclusion The thickness reduction in mouthguards was mitigated by moving the model forward just before vacuum forming. The reduction was smaller as the moving distance of the model increased. This study suggested that moving the model 20 mm or more forward just before vacuum forming could secure the labial thickness of 3 mm or more.

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“…Wearing a mouthguard during sports reduces the risk of dental injury via absorbing impact forces, and the effectiveness and safety of the mouthguard are closely linked to the mouthguard material and thickness [1] [2] [3] [4] [5]. And, whether athletes can continue to use the mouthguard or not depends largely on the feeling of wearing, such as pronunciation and ease of breathing [6].…”

Section: Introductionmentioning

confidence: 99%

Difference in Surface Roughness of Ethylene-Vinyl-Acetate Sheet before and after Application of Finishing Liquid: Part 2 Changes over Time in Surface Roughness

Takahashi¹,

Bando²

2019

MSA

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Surface texture of the mouthguard affects the sense of adaptation in the athlete and further affects hygiene. The aim of this study was to investigate the changes over time in surface roughness after finish polishing of ethylene vinyl acetate (EVA) sheets and before and after finishing liquid application, and to evaluate its effectiveness. Total of 160 specimens of EVA (3 × 3 mm) were divided into 4 groups according to polishing condition (control = unpolished; RB = Robinson-brush; LF = Lisko-Fine, and MW = Mouthguard-wheel). Polishing was performed at low speed by using a straight headpiece. The rotation speed was 5000, 4000 and 6000 rpm for RB, LF, and MW, respectively. Next, a finishing liquid was applied to each specimen. Changes over time in surface roughness before and after application of the finishing liquid were compared by a non-contact surface shape measuring machine. The arithmetic average height (Sa) was measured. The measurement time points were before application, immediately after application, and at 5, 10, and 15 min after application. The changes over time of the surface roughness of the sheet before and after application of the finishing liquid were analyzed by two-way analysis of variance and Bonferroni's multiple comparison tests. Surface roughness of the specimen before application became coarse in the order of control;MW, LF and RB, and Sa were about 0.21 µm, 2.03 µm, 2.94 µm, and 4.72 µm, respectively. That showed the same order after finishing liquid application.Significant decrease in Sa for RB and LF were seen at 10 min after application and at 5 min after application, respectively. 452Materials Sciences and Applications lubricity of about 1.0 µm increases within 5 -10 min of application of finishing liquid, but in cases where polishing was performed to about 2.0 µm; the application of finishing liquid has no effect.

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Influence of custom‐made and stock mouthguard thickness on biomechanical response to a simulated impact

Cited by 65 publications

References 25 publications

Does the prosthesis weight matter? 3D finite element analysis of a fixed implant-supported prosthesis at different weights and implant numbers

Does the prosthesis weight matter? 3D finite element analysis of a fixed implant-supported prosthesis at different weights and implant numbers

Movement of model position just before vacuum forming to ensure mouthguard thickness: Part 2 Effect of model moving distance

Difference in Surface Roughness of Ethylene-Vinyl-Acetate Sheet before and after Application of Finishing Liquid: Part 2 Changes over Time in Surface Roughness

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