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A STUDY ON CHANGE OF COMPRESSIVE STRENGTH AND FLEXURAL STRENGTH OF DENTAL COMPOSITE RESIN AFTER WATER STORAGE

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Á¤³»Á¤, ±èÁ¤¿í, ÀÌ»óÈÆ,
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Á¤³»Á¤ ( Jeong Nae-Jeong ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ ¼Ò¾ÆÄ¡°úÇб³½Ç
±èÁ¤¿í ( Kim Jung-Wook ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ ¼Ò¾ÆÄ¡°úÇб³½Ç ¹× Ä¡Çבּ¸¼Ò
ÀÌ»óÈÆ ( Lee Sang-Hoon ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ ¼Ò¾ÆÄ¡°úÇб³½Ç ¹× Ä¡Çבּ¸¼Ò

Abstract

ÄÞÆ÷ÁþÆ® ·¹ÁøÀÇ ´Ù¾çÇÑ ¼ººÐÀº ±â°èÀû ¼ºÁú¿¡ ¸¹Àº ¿µÇâÀ» ¹ÌÄ¡°í, ¼öº¹¹° ÁÖÀ§ÀÇ È¯°æ ¶ÇÇÑ Àç·áÀÇ ¼ºÁú¿¡ ¸¹Àº ¿µÇâÀ» ÁÙ ¼ö ÀÖ´Ù. ±¸°­ ³»¿¡¼­ ¼öº¹µÈ ÄÞÆ÷ÁþÆ® ·¹ÁøÀº Ç×»ó ¼öºÐ¿¡ ³ëÃâµÇ¾î ÀÖ°í, ÄÞÆ÷ÁþÆ® ·¹ÁøÀÇ ¸ÅÆ®¸¯½º´Â ¼öºÐÀ» Èí¼öÇÒ ¼ö ÀÖÀ¸¹Ç·Î, ±× °á°ú ÄÞÆ÷ÁþÆ® ·¹ÁøÀº ÆØâÇÏ°Ô µÈ´Ù. ¶ÇÇÑ ÄÞÆ÷ÁþÆ® ·¹ÁøÀÇ ¼öºÐ Èí¼ö°¡ Ç¥¸é°­µµ¿Í ¸¶¸ðÀúÇ×ÀÇ ÀúÇÏ¿Í °ü°èµÈ ´Ù°í ¾Ë·ÁÁ® Àִ¹٠ÀúÀÚ´Â Ä¡°ú¿ë ÄÞÆ÷ÁþÆ® ·¹ÁøÀÇ ¼öºÐ Èí¼ö¿¡ µû¸¥ ¾ÐÃà°­µµ¿Í ±¼°î°­µµÀÇ º¯È­¿¡ °üÇÏ¿© ¾Ë¾Æº¸°íÀÚ ÇÏ¿´´Ù. Àç·á´Â 1±ºÀ» Z-100(3M, U.S.A.), 2±ºÀ» Spectrum(Dentsply, U.S.A.), 3±ºÀ» Clearfil AP-X(Kuraray, Japan), 4±ºÀ» Pyramid(Bisco, U.S.A), 5±ºÀ» Heliomolar(Vivadent, Germany)·Î ³ª´©¾î 7ÀÏ, 30ÀÏ, 60ÀÏ, 120ÀÏ°£ Áõ·ù¼ö¿¡ ³Ö¾î ¿¡¼­ º¸°üÇÑ ÈÄ Instron 6022(Instron, U.K.)¸¦ ÀÌ¿ëÇÏ¿© ¾ÐÃà°­µµ¿Í ±¼°î°­µµ¸¦ ÃøÁ¤ÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù. 1. 7ÀÏ, 30ÀÏ, 60ÀÏ, 120ÀÏ·Î ±â°£ÀÌ Áõ°¡ÇÔ¿¡ µû¶ó ¸ðµç ±º¿¡¼­ ¾ÐÃà°­µµ°¡ °¨¼ÒÇÏ¿´´Ù(p<0.05). 2. 7ÀÏ, 30ÀÏ, 60ÀÏ, 120ÀÏ·Î ±â°£ÀÌ Áõ°¡ÇÔ¿¡ µû¶ó ¸ðµç ±º¿¡¼­ ±¼°î°­µµ°¡ °¨¼ÒÇÏ¿´´Ù(p<0.05). 3. Hybrid typeÀÎ 1, 2, 3±º¿¡ ºñÇØ matrix ºñÀ²ÀÌ ³ôÀº microfine typeÀÎ 5±ºÀÌ °­µµ°¡ ³·¾Ò´Ù.

The difference of composition of composite resin may affect the mechanical properties of composite resin and the environment is important for the properties of materials. The composite resin restoration is always exposed to fluid in oral cavity and the composite resin matrix is able to absorb water, which is accompanied by some swelling of the composite The uptake of water by composites has been correlated with decreases in surface hardness and wear resistance. The purpose of this study was to investigate the effects of water storage in distilled water after 7days, 30days, 60days, 120days on compressive strength and flexural strength of dental composite resin, Z-100(group 1) Spectrum(group 2), Clearfil AP-X(group 3), Pyramid(group 4), Heliomolar(group 5). The compressive and flexural strength were measured by instron machine. The following results were obtained: 1. There were significant reduction of compressive strength as water storage time increased, 7days, 30days, 60 days, 120days(p<0.05). 2. There were significant reduction of flexural strength as water storage time increased, 7days, 30days, 60days, 120days(p<0.05). 3. Group 1, 2, 3 -hybrid type showed higher compressive and flexural strength than group 5-microfine type which had lower filler contents.

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Composite resin;Matrix;Water absorption;Compressive strength;Flexural strength

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