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Stress distribution of Class V composite resin restorations: A three-dimensional finite element study

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¹ÚÁ¤±æ ( Park Jeong-Kil ) - ºÎ»ê´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç
Ç㺹 ( Hur Bock ) - ºÎ»ê´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç
±è¼º±³ ( Kim Sung-Kyo ) - °æºÏ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç

Abstract

º» ¿¬±¸´Â 3Â÷¿ø À¯ÇÑ¿ä¼Ò ºÐ¼®¹ýÀû ¿¬±¸¸¦ ÅëÇØ ½û±âÇü ºñ¿ì½Ä¼º Ä¡°æºÎº´¼ÒÀÇ º¹ÇÕ·¹Áø ¼öº¹¹°¿¡¼­ ´Ù¸¥ ź¼º°è¼ö¸¦ °¡Áø º¹ÇÕ·¹ÁøÀÇ ¼öº¹°ú ¿Íµ¿ÀÇ ÇüÅÂ¿Í ÀÀ·ÂÀÇ ¹æÇâ¿¡ µû¸¥ ÀÀ·ÂºÐÆ÷ÀÇ ¿µÇâ¿¡ ´ëÇØ ¾Ë¾Æº¸°íÀÚ ÇÏ¿´´Ù.
¹ß°ÅµÈ »ó¾Ç Á¦2¼Ò±¸Ä¡¸¦ Micro-CT·Î ½ºÄµÇÑ ÈÄ 3D-DOCTOR·Î 3Â÷¿øÀ¯ÇÑ¿ä¼Ò ¸ðÇüÀ» Á¦ÀÛÇÏ¿´´Ù. Á¦ÀÛµÈ ¼Ò±¸Ä¡ ¸ðÇü¿¡ ½û±âÇü ¿Íµ¿°ú º¯Çü½ÃŲ ¿Íµ¿À» Çü¼ºÇÏ°í °¢ ¿Íµ¿À» ź¼º°è¼ö°¡ ¼­·Î ´Ù¸¥ È¥ÇÕÇü º¹ÇÕ·¹Áø ¶Ç´Â È帧¼º º¹ÇÕ·¹ÁøÀ¸·Î ¼öº¹ÇÏ¿´´Ù. ¼öº¹ Àü, ÈÄ ÇùÃø±³µÎ¿Í ¼³Ãø±³µÎ¿¡ 500NÀÇ ÇÏÁßÀ» °¡ÇÑ ÈÄ ÀÀ·ÂºÐÆ÷¸¦ ANSYS ÇÁ·Î±×·¥À» ÀÌ¿ëÇÏ¿© ÁÖ ÀÀ·Â ºÐ¼®¹ýÀ¸·Î Æò°¡ÇÑ ¹Ù ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù.
1. ¼öº¹ Àü ÀÀ·ÂÀº ±Ù½ÉÃø ¹é¾Ç¹ý¶û°æ°è¿Í ¿Íµ¿Àú ¼±°¢ºÎ¿¡ ÁýÁߵǾúÀ¸¸ç ÃÖ´ëÀÀ·ÂÀº ±Ù½ÉÇùÃø¿ì°¢ºÎ¿¡¼­ ³ªÅ¸³µ´Ù.
2. ¿Íµ¿¼öº¹ ÈÄ ¿Íµ¿Àú ¼±°¢ÀÇ ÀÀ·ÂÀº ÇöÀúÈ÷ °¨¼ÒÇßÀ¸³ª Ä¡°æºÎÃø º¯¿¬ÀÇ ÀÀ·ÂÀº ¼öº¹Àüº¸´Ù Áõ°¡ÇÏ¿´´Ù.
3. ½û±âÇüÅÂÀÇ º´¼ÒÀÇ ¼öº¹ ½Ã ¿Íµ¿Àú ¼±°¢ºÎ´Â ź¼º°è¼ö°¡ ³ôÀº Àç·á°¡ À¯¸®ÇÏ°í Ä¡°æºÎÃø º¯¿¬Àº ź¼º°è¼ö°¡ ³·Àº Àç·á°¡ À¯¸®ÇÏ¿´´Ù.
4. ¿Íµ¿Àú ¼±°¢ºÎ¸¦ µÕ±Û°Ô º¯È­½ÃÅ°´Â °ÍÀº ¾ÐÃàÀÀ·ÂÀº °¨¼Ò½ÃÅ°Áö ¾ÊÀ¸³ª ÀÎÀåÀÀ·ÂÀº °¨¼Ò½ÃÄ×´Ù.

This study was to investigate the influence of composite resins with different elastic modulus, cavity modification and occlusal loading condition on the stress distribution of restored notch-shaped noncarious cervical lesion using 3-dimensional (3D) finite element (FE) analysis.
The extracted maxillary second premolar was scanned serially with Micro-CT. The 3D images were processed by 3D-DOCTOR. ANSYS was used to mesh and analyze 3D FE model. A notch-shaped cavity and a modified cavity with a rounded apex were modeled. Unmodified and modified cavities were filled with hybrid or flowable resin. After restoration, a static load of 500N was applied in a point-load condition at buccal cusp and palatal cusp. The stress data were analyzed using analysis of principal stress.
The results were as follows:
1. In the unrestored cavity, the stresses were highly concentrated at mesial CEJ and lesion apex and the peak stress was observed at the mesial point angle under both loading conditions.
2. After restoration of the cavity, stresses were significantly reduced at the lesion apex, however cervical cavosurface margin, stresses were more increased than before restoration under both loading conditions.
3. When restoring the notch-shaped lesion, material with high elastic modulus worked well at the lesion apex and material with low elastic modulus worked well at the cervical cavosurface margin.
4. Cavity modification the rounding apex did not reduce compressive stress, but tensile stress was reduced.

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Cervical lesion;class V lesion;composite resin;finite element analysis;stress distribution

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