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CHEMICAL DEGRADATION OF LIGHT-CURED DENTAL COMPOSITE RESINS

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Abstract

ÀÌ»óÀûÀÎ ¼öº¹Àç·áÀÇ ¿ä°ÇÀ¸·Î Ä¡¾ÆÀÇ ÀúÀÛ±â´É°ú ½É¹Ì¼ºÀ» ÃæºÐÈ÷ ȸº¹½Ãų ¼ö ÀÖ´Â ¹°¸®Àû, È­ÇÐÀû ¼ºÁúÀ» °®Ãß´Â µ¿½Ã¿¡ »ý¹°ÇÐÀûÀÎ ÀûÇÕ¼º°ú ±¸°­³» ȯ°æº¯È­¿¡ µû¸¥ ³»±¸¼º µîÀ» µé ¼ö ÀÖ´Ù. ±×·¯³ª º¹ÇÕ·¹ÁøÀ» ÀÌ¿ëÇÏ¿© Ä¡¾Æ¸¦ ¼öº¹ÇÏ¿´À» ¶§ ¼öº¹¹°Àº ±¸°­³»¿¡¼­ ½Ã°£ÀÌ È帧¿¡ µû¶ó Ÿ¾×³»¿¡¼­ ¼­¼­È÷ ºÐÇØµÇ°í ±³ÇÕ·ÂÀ̳ª À½½Ä¹°¿¡ ÀÇÇØ ¸¶¸ðµÇ¾î°¡´Â ¿î¸íÀ» °ÅÄ£´Ù. º» ¿¬±¸¿¡¼­´Â ÇöÀç ¼öº¹Àç·á·Î¼­ ¸¹ÀÌ »ç¿ëµÇ°í ÀÖ´Â Definite( AG, Germany). Revolution(Kerr, U.S.A.), Unifil(GC, Japan), Palfique(Tokuyama, Japan)ÀÇ 4Á¾ÀÇ º¹ÇÕ·¹ÁøÀ» ¾ËÄ«¸®¼º ¿ë¾× (0.1N NaOH)¿¡ º¸°üÇÏ¿´À» ¶§ °¢ Á¦Ç°ÀÇ ºÐÇØÀúÇ×¼ºÀ» Æò°¡ÇÏ°íÀÚ ÇÏ¿´´Ù. °¢ Á¦Ç°´ç 3°³ÀÇ ½ÃÆíÀ» Á¦ÀÛÇÏ¿© ¹«°ÔÃøÁ¤À» ÇÑ ÈÄ 0.1N NaOH¿¡ ÀúÀåÇÏ¿© ¿¡¼­ º¸°üÇÏ¿´´Ù. 2ÁÖ ÈÄ Á¦°ÅÇÏ¿© HCl·Î ÁßÈ­, ¼¼Ã´ ÈÄ ¿¡¼­ °ÇÁ¶ÇÏ¿´´Ù. ¹«°Ô¼Õ½Ç, Ç¥¸éÇϺÐÇØÃþ ±íÀÌ, ¿ëÃâµÈ Si³óµµ¸¦ ±âÁØÀ¸·Î °¢ ·¹ÁøÀÇ ºÐÇØÀúÇ×¼ºÀ» Æò°¡ÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù. 1. ¹«°Ô¼Õ½Ç·®Àº Unifil¿¡¼­ 3.21%·Î °¡Àå ³ô¾ÒÀ¸³ª °¢°¢ Á¦Ç°°£¿¡ À־ÀÇ Â÷À̸¦ º¸ÀÌÁö´Â ¾Ê¾Ò´Ù. 2. ºÐÇØÃþ ±íÀÌ´Â ÀÇ ¹üÀ§¿´°í, Unifil, Palfique, Revolution, Definite ¼øÀ¸·Î °¨¼ÒÇÏ¿´À¸¸ç Palfique, Definite¸¦ Á¦¿ÜÇÑ ´Ù¸¥ Á¦Ç°°£¿¡´Â À¯ÀÇÇÑ Â÷À̸¦ º¸¿´´Ù(p<0.05). 3. Si ¿ëÃâ·®Àº Palfique°¡ 8940.0ppmÀ¸·Î °¡Àå ¸¹Àº ¿ëÃâ·®À» º¸¿´À¸¸ç Revolution°ú Definite¸¦ Á¦¿ÜÇÑ °¢ Á¦Ç°°£¿¡´Â À¯ÀÇÇÑ Â÷À̸¦ º¸¿´´Ù(p<0.05). 4. °¢ Á¦Ç°ÀÇ ¹«°Ô¼Õ½Ç°ú ºÐÇØÃþ ±íÀÌ »çÀÌ¿¡´Â ³ôÀº »ó°ü°ü°è¸¦ º¸¿´´Ù(r=0.06, p<0.05). 5. °¢ Á¦Ç°ÀÇ ¹«°Ô¼Õ½Ç°ú Si ¿ëÃâ·®, ºÐÇØÃþ ±íÀÌ¿Í Si ¿ëÃâ·® »çÀÌ¿¡´Â À¯ÀÇÇÑ »ó°ü°ü°è¸¦ º¸ÀÌÁö ¾Ê¾Ò´Ù. 6. ÁÖ»çÀüÀÚÇö¹Ì°æ °üÂû½Ã NaOH¿ë¾×¿¡ º¸°üÇÑ ÈÄ ·¹Áø ±âÁú°ú ÇÊ·¯ »çÀÌÀÇ °áÇÕÀÇ Æı«¸¦ °üÂûÇÒ ¼ö ÀÖ¾ú´Ù.

The aim of this study was to evaluate the resistance to degradation of four commercial composite resins in an alkaline solution. The brands studied were Unifil(GC, Japan), Palfique(Tokuyama Japan). Definite AG, Germany). Revolution(Kerr, U.S.A.). Preweighed discs of each brand were exposed 0.1N NaOH solution at . After 14 days they were removed, neutralized with HCl, washed with water and dried. Resistance to degradation was evaluated on the basis of following parameters: (a) mass loss(%) - determined from pre-and post-exposed specimen weights; (b) Si loss(ppm) - obtained from ICP-AE analysis of solution exposed to specimens; and (c) degradation depth - measured microscopically (SEM) from polished circular sections of exposed specimens. The results were follows: 1. The mass loss of Unifil was 3.21%, it was the highest of materials. But, there was no significant difference among the materials. 2. The degree of degradation layer depth was , the sequence of the degree pf degradation layer depth was in descending order by Unifil, Palfique, Revolution, Definite. There was significant difference among the materials except Palfique and Definite. 3. The Si loss of Paltique was 8940.0ppm, it was the highest. There was significant difference among the materials, except Revolution and Definite(p<0.05). 4. The correlation coefficient between mass loss and degradation depth was relatively high(r = 0.06, p<0.05). 5. There was no significant coefficient correlation between Si loss and mass loss, and/or the degree of degradation layer depth and Si loss. 6. When observed with SEM, destruction of bonding is observed between resin matrix and filler. Above results suggested that the hydrolytic degradation is considered as evaluation factor of composite resins.

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Composite resins;Chemical degradation;Alkaline solution

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