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STRESS DISTRIBUTION OF ENDODONTICALLY TREATED MAXILLARY SECOND PREMOLARS RESTORED WITH DIFFERENT METHODS: THREE-DIMENSIONAL FINITE ELEMENT ANALYSIS

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ÀÓµ¿¿­ ( Lim Dong-Yeol ) - ºÎ»ê´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø º¸Á¸Çб³½Ç
±èÇöö ( Kim Hyeon-Cheol ) - ºÎ»ê´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø º¸Á¸Çб³½Ç
Ç㺹 ( Hur Bock ) - ºÎ»ê´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç
±è±¤ÈÆ ( Kim Kwang-Hoon ) - ºÎ»ê´ëÇб³ °ø°ú´ëÇÐ ±â°è¼³°è°øÇаú
¼Õ±Ç ( Son Kwon ) - ºÎ»ê´ëÇб³ °ø°ú´ëÇÐ ±â°è¼³°è°øÇаú
¹ÚÁ¤±æ ( Park Jeong-Kil ) - ºÎ»ê´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç

Abstract

º» ¿¬±¸ÀÇ ¸ñÀûÀº ±Ù°üÄ¡·á µÈ Ä¡¾Æ¸¦ ±¸Á¶¿Í ¹°¼ºÀÌ ´Ù¸¥ post¿Í core ±×¸®°í ÀüÀå°üÀ¸·Î ¼öº¹ÇÑ ÈÄ °úµµÇÑ ±³ÇÕÇÏÁßÀ» °¡ÇßÀ» ¶§ Ä¡¾Æ¿¡ ³ªÅ¸³ª´Â ÀÀ·ÂºÐÆ÷¸¦ Á¶»çÇϱâ À§ÇÔÀÌ´Ù. ¹ßÄ¡ µÈ »ó¾Ç Á¦2¼Ò±¸Ä¡¸¦ micro-CT·Î ´ÜÃþÃÔ¿µÇÏ°í 3D Doctor·Î À±°û¼±À» ÃßÃâÇÑ ´ÙÀ½ HyperMesh Ver. 6À¸·Î »ïÂ÷¿ø Ä¡¾Æ¸ðÇüÀ» ¸¸µé°í ´ÙÀ½°ú °°Àº ¼¼ °¡Áö ¹æ¹ýÀ¸·Î ¼öº¹ÇÑ À¯ÇÑ¿ä¼Ò¸ðÇüÀ» Á¦ÀÛÇÏ¿´´Ù. 1) ½ºÅ×Àη¹½º ½ºÆ¿ Æ÷½ºÆ®¿Í º¹ÇÕ·¹Áø ÄÚ¾î ±×¸®°í µµÀç¼ÒºÎÀüÀå±Ý°üÀ¸·Î ¼öº¹ÇÑ ¸ðÇü. 2) fiber Æ÷½ºÆ®¿Í º¹ÇÕ·¹Áø ÄÚ¾î ±×¸®°í ÀüºÎµµÀç°üÀ¸·Î ¼öº¹ÇÑ ¸ðÇü 3) Æ÷½ºÆ®, ÄÚ¾î¿Í ÀüÀå°üÀÌ ÀÏüÇüÀÎ °£Á¢º¹ÇÕ·¹Áø EndoCrownÀ¸·Î ¼öº¹ÇÑ ¸ðÇü Çü¼ºµÈ ¸ðÇüÀÇ ÇùÃø ¶Ç´Â ¼³Ãø±³µÎ¿¡ 500NÀÇ ÇÏÁßÀ» °¡ÇÏ¿´À¸¸ç ÇÏÁßÀÇ ¹æÇâÀº Ä¡¾Æ ÀåÃà¿¡ ´ëÇØ 45µµ À̾ú´Ù. Ä¡°üºÎ¿Í Ä¡±ÙºÎÀÇ von Mises ÀÀ·ÂÀ» ANSYS 9.0ÇÁ·Î±×·¥À¸·Î ºÐ¼®ÇÑ °á°ú Æ÷½ºÆ®¿Í ÄÚ¾îÀÇ Çüź¸´Ù´Â ÀüÀå°ü Àç·áÀÇ Åº¼º °è¼ö°¡ ±Ù°üÄ¡·áµÈ »ó¾Ç ¼Ò±¸Ä¡ÀÇ ÀÀ·ÂºÐÆ÷¸¦ Á¿ìÇÏ¿´´Ù. Ä¡°üºÎ¿¡¼­´Â Àç·áÀÇ Åº¼º°è¼ö°¡ ³ôÀº Àü Àå°üÀ¸·Î ¼öº¹ÇÑ ¸ðÇüÀÌ ³·Àº ÀÀ·ÂºÐÆ÷¸¦ º¸¿´´Ù. Ä¡±ÙºÎ¿¡¼­´Â Àç·áÀÇ Åº¼º°è¼ö°¡ ³·Àº Àü Àå°üÀ¸·Î ¼öº¹ÇÑ ¸ðÇü ÀÌ ³·Àº ÀÀ·ÂºÐÆ÷¸¦ º¸¿´´Ù

The purpose of this study was to evaluate the influence of elastic modulus of restorative materials and the number of interfaces of post and core systems on the stress distribution of three differently restored endodontically treated maxillary second premolars using 3D FE analysis. Model 1, 2 was restored with a stainless steel or glass fiber post and direct composite resin. A PFG or a sintered alumina crown was considered. Model 3 was restored by EndoCrown. An oblique 500 N was applied on the buccal (Load A) and palatal (Load B) cusp. The von Mises stresses in the coronal and root structure of each model were analyzed using ANSYS. The elastic modulus of the definitive restorations rather than the type of post and core system was the primary factor that influenced the stress distribution of endodontically treated maxillary premolars. The stress concentration at the coronal structure could be lowered through the use of definitive restoration of high elastic modulus. The stress concentration at the root structure could be lowered through the use of definitive restoration of low elastic modulus.

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EndoCrown;Elastic modulus;Finite element analysis;Stress distribution;Maxillary premolar

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