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

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ÀÌÇöÁ¾ ( Lee Hyeon-Jong ) - °æÈñ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Ã¶Çб³½Ç
ÃÖ¿ìÁø ( Choi Woo-Jin ) - °æÈñ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Ã¶Çб³½Ç
È«¼ºÁø ( Hong Sung-Jin ) - °æÈñ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Ã¶Çб³½Ç
·ù°æÈñ ( Ryu Kyung-Hee ) - °æÈñ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Ã¶Çб³½Ç
ÃÖ´ë±Õ ( Choi Dae-Gyun ) - °æÈñ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Ã¶Çб³½Ç

Abstract

¿¬±¸¸ñÀû: ´Ù¾çÇÑ ¹°¼ºÀÇ ÃþÀ¸·Î Á¦ÀÛµÈ ¸¶¿ì½º°¡µå¸¦ ÀåÂøÇÏ¿´À» ¶§ Ä¡¾Æ¿Í ¾Ç°ñ¿¡ °¡ÇØÁö´Â ÈûÀÇ À¯ÇÑ¿ä¼Ò ºÐ¼®À» ½ÃÇàÇϱâ À§ÇÔÀÌ´Ù.

¿¬±¸ Àç·á ¹× ¹æ¹ý: ¿¬±¸´ë»óÀÇ ¸ðÇüÀ» ±³Çձ⿡ ÀåÂøÇÑ µÚ Signature Mouthguard System (Dreve dentamid GmbH., Unna, Germany)À» ÀÌ¿ëÇÏ¿© ¸ÂÃãÇü ±¸°­º¸È£ÀåÄ¡¸¦ Á¦ÀÛÇÏ¿© ÀåÂøÇÑ ÈÄ µÎÁ¤ºÎ¿¡¼­ °æÃß±îÁö 1.0 mm·Î ÄÄÇ»ÅÍ ´ÜÃþÃÔ¿µÀ» ½ÃÇàÇÏ¿´´Ù. ¿µ»óÀ» Cantibio BIONIX ÇÁ·Î±×·¥À» ÀÌ¿ëÇÏ¿© 3Â÷¿ø À¯ÇÑ¿ä¼Ò ¸ðµ¨À» »ý¼ºÇÑ µÚ HyperMesh ¼ÒÇÁÆ®¿þ¾î¸¦ ÀÌ¿ëÇÏ¿© µ¥ÀÌÅÍ ºÐ¼®À» ½ÃÇàÇÏ¿´´Ù. ¸¶¿ì½º°¡µå´Â Ãþ¿¡ µû¶ó ´ÙÀ½°ú °°ÀÌ ºÐ·ùÇÏ¿´´Ù. 1. ¿¬Áú(Bioplast)(SG) 2. °æÁú(Duran)(HG) 3. ÁßÁú(Drufomat)(MG) 4. ¿¬Áú+ÁßÁú(SG + HG) 5. °æÁú + ¿¬Áú(HG + SG) 6. ¿¬Áú + °æÁú + ¿¬Áú(SG + HG + SG) 7. °æÁú + ¿¬Áú + °æÁú(HG + SG + HG)ÇÏÁßÀ§Ä¡´Â ÇϾǰñÀÇ Àü¹æ À̺Î(F1), ÇÏ¾Ç ÁÂÃø Á¦1´ë±¸Ä¡ ÇϹæÀÇ ÇϾÇü Áß¾Ó(F2), ÇϾǰ¢ÀÇ Àü¿¬(F3) ¼¼Á¡À¸·Î ÇÏ¿´°í FH Plane¿¡ 45µµ ¹æÇâÀ¸·Î 800N, 0.1ÃÊÀÇ ÈûÀ» °¡ÇÏ¿´´Ù. °è¹æ¹ýÀ¸·Î´Â¹Ýº¹ºÐ»êºÐ¼®°ú»çÈĺм®(´ÙÁߺñ±³ºÐ¼®(Multiple comparison test) DUNCAN test)À»ÀÌ¿ëÇÏ¿´´Ù. SPSS ¼ÒÇÁÆ®¿þ¾î (Ver.13, SPSS Inc., Chicago, IL, USA)¸¦»ç¿ëÇÏ¿© ºÐ¼®ÇÏ¿´´Ù.

°á°ú: Ä¡¾Æ¿Í »ó¾Ç°ñ¿¡¼­ÀÇ ÀÀ·ÂºÐÆ÷´Â ¸ðµç ÇÏÁßÀ§Ä¡¿¡ ´ëÇÏ¿© ¿¬ÁúÃþÀÌ ÇÏ¾Ç Ä¡¾Æ¿¡ Á¢ÃËÇÏ´Â ±¸°­º¸È£ÀåÄ¡°¡ ÀûÀº ÀÀ·Â°ªÀ» ³ªÅ¸³ÂÀ¸¸ç, °úµÎ¿¡¼­ÀÇ ÀÀ·ÂºÐÆ÷´Â ¸ðµç ÇÏÁßÀ§Ä¡¿¡ ´ëÇÏ¿© °æÁúÃþÀÌ ÇÏ¾Ç Ä¡¾Æ¿¡ Á¢ÃËÇÏ´Â ±¸°­º¸È£ÀåÄ¡°¡ ÀûÀº ÀÀ·Â°ªÀ» ³ªÅ¸³»¾ú´Ù. µÎ ¿¬ÁúÃþ »çÀÌ¿¡ °æÁúÃþÀÌ °³ÀçµÈ ¼¼ÃþÀÇ ±¸°­º¸È£ÀåÄ¡°¡ ÇÏÁß ½Ã »ó´ëÀûÀ¸·Î °í¸£°Ô ÀÀ·ÂÀÌ ºÐ»êµÇ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù.

°á·Ð: »óÇÏ¾Ç Ä¡¾Æ¿¡´Â ¿¬ÁúÃþÀÌ Á¢ÃËÇÏ°í µÎ ¿¬ÁúÃþ »çÀÌ¿¡ °æÁúÃþÀ» »ðÀÔÇÏ´Â ÇüÅÂÀÇ ±¸°­º¸È£ÀåÄ¡°¡ ¾Ç¾È¸é ¿Ü»ó ½Ã »ó´ëÀûÀ¸·Î ÇÏÁßÀ» ºÐ»ê½ÃÅ°´Âµ¥ °¡Àå ¿ì¼öÇÏ´Ù
°í »ý°¢µÈ´Ù.

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. ¨ç soft guard (Bioplast)(SG) ¨è hard guard (Duran)(HG) ¨é medium guard (Drufomat)(MG) ¨ê soft layer + hard layer (SG + HG) ¨ë hard layer + soft layer (HG + SG) ¨ì soft layer + hard layer + soft layer (SG + HG + SG) ¨í 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(R)). 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.

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FEM analysis; Mouthguard; Stress distribution; Soft layer; Hard layer

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KCI
KoreaMed