Finite element analysis of the effects of mouthguard produced by combination of layers of different materials on teeth and jaw

Woong-Seob So; Hyun-Jong Lee; Woo-Jin Choi; Sung-Jin Hong; Kyung-Hee Ryu; Dae-Gyun Choi

doi:10.4047/jkap.2011.49.4.324

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So, Lee, Choi, Hong, Ryu, and Choi: Finite element analysis of the effects of mouthguard produced by combination of layers of different materials on teeth and jaw

ORIGINAL ARTICLE

J Korean Acad Prosthodont 2011;49(4):324-332.

Published online: 18 December 2011

DOI: https://doi.org/10.4047/jkap.2011.49.4.324

Finite element analysis of the effects of mouthguard produced by combination of layers of different materials on teeth and jaw

Woong-Seob So, DMD, MSD, PhD, Hyun-Jong Lee, MD, Woo-Jin Choi, MD, Sung-Jin Hong, MD, Kyung-Hee Ryu, MD, Dae-Gyun Choi, DMD, PhD^∗

Department of Prosthodontics, School of Dentistry, Kyung Hee University, Seoul, Korea

∗Corresponding Author: Dae-Gyun Choi Department of Prosthodontics, School of Dentistry, Kyung Hee University, 1 Hoegi-dong, Dongdaemun-gu, Seoul, 130-701, Korea +82 2 958 9340: e-mail, choi@khu.ac.kr

Received 12 October 201119 October 2011 Accepted 24 October 2011

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

The purpose of this study was to compare the stress distribution of teeth and jaw on load by differentiating property of materials according to each layer of widely used mouthguard.

Materials and methods

A Korean adult having normal cranium and mandible was selected to examine. A customized mouthguard was constructed by use of DRUFOMAT plate and DRUFOMAT-TE/-SQ of Dreve Co. according to Signature Mouthguard system. The cranium was scanned by means of computed tomography with 1mm interval. It was modeled with CANTIBio BIONIX/Body Builder program and simulated and interpreted using Alter HyperMesh program. The mouthguard was classified as follows according to the layers. ① soft guard (Bioplast)(SG) ② hard guard (Duran)(HG) ③ medium guard (Drufomat)(MG) ④ soft layer + hard layer (SG + HG) ⑤ hard layer + soft layer (HG + SG) ⑥ soft layer + hard layer + soft layer (SG + HG + SG) ⑦ hard layer + soft layer + hard layer (HG + SG + HG) The impact locations on mandible were gnathion, the center of inferior border, and the anterior edge of gonial angle. And the impact directions were oblique (45°). The impact load was 800 N for 0.1 sec. The stress distribution was measured at maxillary teeth, TMJ and maxilla. The statistics were conducted using Repeated ANOVA and in case of difference, Duncan test was used as post analysis.

Results

In teeth and maxilla, the mouthguard contacting soft layer of mandibular teeth presented lowest stress measure and, in contrast, in condyle, the mouthguard contacting hard layer of mandibular teeth presented lowest stress measure.

Conclusion

For all impact directions, soft layer + hard layer + soft layer, the mouthguard with three layers which the hard layer is sandwiched between two soft layers, showed relatively even distribution of stress in impact. (J Korean Acad Prosthodont 2011;49:324-32)

Keywords: FEM analysis, Mouthguard, Stress distribution, Soft layer, Hard layer

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