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AN EVALUATION OF CHEMICAL DEGRADATION OF LIGHT-CURED RESTORATIVE COMPOSITES

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Abstract

º» ¿¬±¸¿¡¼­´Â 4Á¾ÀÇ º¹ÇÕ·¡Áø(Patpique Estelite, Filtek P 60, Spectrum, Charisma)À» ¼±ÅÃÇÏ¿´´Ù. °¢ Á¦Ç°´ç 5°³ÀÇ ½ÃÆíÀ» Á¦ÀÛÇÏ¿© ¹«°Ô ÃøÁ¤À» ÇÑ ÈÄ, NaOH ¿ë¾×¿¡ 2ÁÖ µ¿¾È º¸°üÇÏ¿´°í 1.23% HCI·Î ÁßÈ­ÇÏ°í ¼¼Ã´, °ÇÁ¶½ÃÄÑ ¹«°Ô ÃøÁ¤À» ÇÏ¿´´Ù. ÁÖ»çÀüÀÚÇö¹Ì°æ°ú °øÃÊÁ¡ ·¹ÀÌÀú ÁÖ»çÇö¹Ì°æÀ¸·Î º¹ÇÕ·¹ÁøÀÇ ºÐÇØÃþ Ç¥¸é°ú ºÐÇرíÀ̸¦ °üÂûÇÏ¿´°í, ºÐÇØ ÀúÇ×¼ºÀº ¿ë¾×³»·Î ÀÀÃâµÈ Si, Al, BaÀÇ ³óµµ¸¦ ±Ù°Å·Î Æò°¡ÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù.
1. °¢ Á¦Ç°ÀÇ ¹«°Ô¼Õ½Ç·®Àº Palpique Estelite°¡ °¡Àå ¸¹¾Ò°í. Filtek P 60 , Charisma, Spectrum ¼øÀ̾ú´Ù.
2. °¢ Á¦Ç°ÀÇ Ç¥¸éÇÏ ºÐÇØÃþ ±íÀÌ´Â Filtek P 60ÀÌ °¡Àå ±í¾ú°í, Charisma, Palpique Estelite, Spectrum ¼øÀ̾ú´Ù.
3. Si ¿ëÃâ·®Àº Charisma°¡ °¡Àå ¸¹¾Ò°í, Spectrum, Palpique Estelite, Filtek P 60 ¼øÀ̾ú´Ù.
4. ¹«°Ô¼Õ½Ç°ú ºÐÇØÃþ ±íÀÌ »çÀÌ¿¡´Â ³ôÀº »ó°ü°ü°è¸¦ º¸¿´´Ù(r=0.704, p<0.05).
5. ÁÖ»çÀüÀÚÇö¹Ì°æ °üÂû½Ã NaOH ¿ë¾×¿¡ º¸°üÇÑ ÈÄ ·¹Áø ±âÁú°ú ÃæÀüÁ¦ »çÀÌÀÇ °áÇÕÀÇ Æı« ¾ç»óÀÎ ºÐÇØÃþ Ç¥¸éÀ» °üÂûÇÒ ¼ö ÀÖ¾ú°í °øÃÊÁ¡ ·¹ÀÌÀú Çö¹Ì°æ °üÂû½Ã ·¹ÁøÀÇ ºÐÇØÃþ ±íÀ̸¦ °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 Charisma, Filtek P 60, Palpique Estelite, and Spectrum. Preweighed discs of each brand were exposed to 0.1N NaOH solution at 60t. After 2 weeks they were removed, neutralized with HCI, 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 Ioss(ppm) obtained from ICPAE analysis of solution exposed to specimens; and (c) degradation depth(um) - measured SEM and CLSM from polished circular sections of exposed specimens.
The results were as follows:
1. The sequence of mass loss was in descending order by Palpique Estelite, Filtek P 60, Charisma, and Spectrum.
2. The sequence of the degree of degradation layer depth was in descending order by Filtek P 60, Charisma, Palpique Estelite, and Spectrum.
3. The sequence of the Si loss was in descending order by Chrisma, Spectrum, Palpique Estelite, and Filtek P 60.
4. The correlation coefficient between mass loss and degradation layer depth was relatively high(r=0.704, p(0.05).
5. When observed with SEM, destruction of bonding was observed between resin matrix and filler.
6. When observed with CLSM, degradation layer depth of composite resin surface was observed.

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º¹ÇÕ·¹Áø;Ç¥¸éÇÏ ºÐÇØ;ºÐÇØÀúÇ×¼º;Composite resins;Subsurface degradation;Resistance to degradation.

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