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CHEMICAL DEGRADATION OF LIGHT CURED COMPOSITE RESINS IN NAOH SOLUTION

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Abstract

º¹ÇÕ·¹ÁøÀÇ Áß¿äÇÑ ÀÓ»óÀû ´ÜÁ¡Àº ³·Àº ¸¶¸ð ÀúÇ×¼ºÀ̸ç, ÀÌ¿Í °ü·ÃµÈ ÇϳªÀÇ ÀÎÀÚ·Î ¼öº¹¹°ÀÇ Ç¥¸éÇÏ ºÐÇØ(subsurface degradation)°¡ °í·ÁµÇ°í ÀÖ´Ù.
º» ¿¬±¸¿¡¼­´Â ¾ËÄ«¸®¼º ¿ë¾×(0.1N NaOH)¿¡ ÇöÀç ±¸Ä¡ºÎ ¼öº¹¿¡ ¸¹ÀÌ ÀÌ¿ëµÇ´Â Z100(3M), Clearfil AP-X(Kuraray), Tetric Ceram(Vivadent)ÀÇ 3Á¾ÀÇ º¹ÇÕ·¹Áø°ú È帧¼ºÀÌ ¶Ù¾î³­ Aeliteflo(Bisco) µî 4Á¾ÀÇ ±¤ÁßÇÕÇü ·¹ÁøÀ» º¸°üÇÏ¿´À» ¶§ °¢ Á¦Ç°ÀÇ ºÐÇìÀúÇ×¼ºÀ» Æò°¡ÇÏ°íÀÚ ÇÏ¿´´Ù.
ºÐÇØÀúÇ×¼ºÀº ´ÙÀ½ÀÇ ÁöÇ¥¸¦ ±Ù°Å·Î Æò°¡ÇÏ¿´´Ù. 1) ¹«°Ô¼Õ½Ç-NaOH ¿ë¾×¿¡ ³ëÃâ ÀüÈÄÀÇ ¹«°Ô ÃøÁ¤, 2) Si ³óµµ - ½ÃÆíÀ» Á¦°ÅÇÑ ¿ë¾×Àº ICP-AEºÐ¼®±â¸¦ ÅëÇÏ¿© ¿ë¾×³»·Î ¿ëÃâµÈ Si ÀÌ¿Â Á¤µµ Æò°¡, 3) ºÐÇØÃþ ±íÀÌ - ¿ë¾×¿¡ º¸°üÇÑ ½ÃÆíÀ» ¿¬¸¶ÇÏ¿© SEMÀ» ÀÌ¿ëÇÏ¿© ºÐÇØÃþÀÇ ±íÀÌ(§­)¸¦ ÃøÁ¤ÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù.
1. °¢ Á¦Ç°ÀÇ ¹«°Ô¼Õ½Ç·®Àº Z100, TC, CL, AE ¼øÀ¸·Î ¸¹¾ÒÀ¸¸ç, AE, CL±º°ú TC, Z100±º »çÀÌ¿¡ À¯ÀÇÇÑ Â÷ÀÌ°¡ ÀÖ¾ú´Ù(p<0.05).
2. °¢ Á¦ÃãÀÇ Ç¥¸éÇÏ ºÐÇØÃþ ±íÀÌ´Â Z100, TC, CL, AE ¼øÀ¸·Î ±í¾úÀ¸¸ç, AE, CL±º°ú Z100±º »çÀÌ¿¡ À¯ÀÇÇÑ Â÷ÀÌ°¡ ÀÖ¾ú´Ù(p<0.05).
3. °¢ Á¦Ç°À¸·ÎºÎÅÍ ¿ëÃâµÈ Si¾çÀº Z100±ºÀÌ °¡Àå ¸¹°í, AE, CL, TC¼øÀ¸·Î ¸¹¾Ò´Ù.
4. ¹«°Ô¼Õ½Ç·®°ú Ç¥¸éÇÏ ºÐÇØÃþ ±íÀÌ »çÀÌ¿¡ ºñ±³Àû ³ôÀº »ó°ü°ü°è¸¦ º¸¿´´Ù(r=0.71, p<0.05).
One of the major deficiencies of composite restorative resins is their insufficient resistance to wear. Of the multitude of factors that have been associated with wear. subsurface degradation within the restoration is considered to be one.
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 Z100(3M), Clearfil AP X(Kuraray), Tetric Ceram(Vivadent), Aelit flo(Bisco). Resistance to degradation was evaluated on the basis of the following parameters: (a) mass loss(%) - determined from pre-and post exposure specimen weights: (b) Si loss(ppm) - obtained from ICP-AE analysis of solution exposed to specimens: and (c) degradation depth(um) - measured microscopically (SEM) from polished circular sections of exposed specimens.
The results were as follows:
1. The sequence of the mass loss was in ascending order by AS, CL, TC, Z100. There was statistically significant difference of mass loss between AE, CL group and TC, Z100 group(p(0.05).
2. The sequence of the degree of degradation layer depth was in ascending order by AS. CL, TC, Z100. But there was no statistically significant difference of degree of degradation layer depth between AE and CL(p(O.05).
3. For the Si concentration, Z100 was the highest of all.
4. The correlation coefficient between mass loss and degradation depth was relatively high(r=0.71, p(0.05).

Å°¿öµå

º¹ÇÕ·¹Áø;Ç¥¸éÇÏ ºÐÇØ;NaOH ¿ë¾×;Composite resin;Subsurface degradation;NaOH solution

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