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A STUDY ON THE POLYMERIZATION SHRINKAGE OF COMPOSITE RESIN ACCORDING TO VARIOUS LIGHT-CURING METHODS

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Abstract

º» ¿¬±¸´Â ÁßÇÕ¼öÃàÀ» ÁÙÀ̱â À§ÇØ °³¹ßµÈ 2´Ü°è ±¤Á¶»ç¹ýÀ» »ç¿ëÇÏ¿© º¹ÇÕ·¹ÁøÀÇ ÁßÇսà ¹ß»ýÇÏ´Â ¼öÃà¾ç»óÀ» ½ºÆ®·¡ÀÎ °ÔÀÌÁö¹ý(strain gauge method)À¸·Î ÃøÁ¤ÇØ º¸°í, ÁßÇÕµµÀÇ ºñ±³¸¦ À§ÇØ ¹Ì¼¼°æµµ¸¦ ÃøÁ¤ÇØ º» ´ÙÀ½ ÀÌ °á°ú¸¦ ±âÁ¸ÀÇ ±¤Á¶»ç¹ý°ú ºñ±³ÇØ º¸°íÀÚ ÇÏ´Â °ÍÀ̾ú´Ù.
³»°æ 6mm, ³ôÀÌ 2mmÀÇ ¾ÆÅ©¸± ÁÖÇü¿¡ º¹ÇÕ·¹ÁøÀÎ Z100^(TM)(3M, USA)À» ÃæÀüÇÏ¿´°í Curing light 2500(3M, USA)°ú Elipar Highlight(ESPE, Germany)ÀÇ ±¤Á¶»ç±â¸¦ »ç¿ëÇÏ¿´´Ù. ¥°±ºÀº ±¤µµ°¡ 450mW/§²ÀÎ Curing light 2500À¸·Î 40ÃÊ°£ ±¤Á¶»çÇÏ¿´°í, ¥±±ºÀº ±¤µµ°¡ 650mW/§²ÀÎ Elipar Hiahlight·Î 40ÃÊ°£ ±¤Á¶»çÇÏ¿´À¸¸ç, ¥²±ºÀº Elipar HighlightÀÇ 2´Ü°è ÁßÇÕ ¹æ¹ýÀ» ÀÌ¿ëÇÏ¿© Ãʱâ 10ÃÊ°£Àº 150mW/§²·Î, ³ª¸ÓÁö 30ÃÊ°£Àº 650mW/§²ÀÇ ±¤µµ·Î Á¶»çÇÏ¿´´Ù. ½ºÆ®·¹ÀÎ °ÔÀÌÁö¹ýÀ» ÀÌ¿ëÇÏ¿© ±¤Á¶»ç ÈÄ 1ÃÊ °£°ÝÀ¸·Î 10ºÐ°£ ¼±ÁßÇÕ ¼öÃà·ü(linear polymerization shrinkage)À» ÃøÁ¤ÇÑ ´ÙÀ½ ±×·¡ÇÁ·Î ºÐ¼®ÇÏ¿´°í, ÁßÇÕ 1ºÐ ÈÄ¿Í 10ºÐ ÈÄÀÇ ¼±¼öÃà·üÀ» ÃøÁ¤ÇÏ¿© Åë°èºÐ¼®ÇÏ¿´À¸¸ç ¹Ì¼¼°æµµ±â¸¦ »ç¿ëÇÏ¿© ÁßÇÕ 24½Ã°£ ÈÄÀÇ °¢ ±ºÀÇ ¹Ì¼¼°æµµ¸¦ ÃøÁ¤ÇÏ¿© Åë°èºÐ¼®ÇÏ¿´´Ù.
ÁßÇÕ¼öÃà ¾ç»óÀ» °üÂûÇØ º» °á°ú °¢ ±º¿¡¼­ ¸ðµÎ ÁßÇÕ Ãʱ⿡ ÀϽÃÀûÀÎ Àç·áÀÇ ÆØâÀ» ³ªÅ¸³»¾ú°í, ±× ÈÄ ¾à 1ºÐ°£Àº ¼öÃà·®ÀÌ ±Þ°ÝÈ÷ Áõ°¡ÇÏ´Ù°¡ Áõ°¡ÀÇ ÆøÀÌ Á¡Â÷ °¨¼ÒÇÏ´Â ¾ç»óÀ» º¸¿´´Ù. Àü¹ÝÀûÀ¸·Î 2´Ü°è ±¤Á¶»ç¹ýÀ» »ç¿ëÇÑ ¥²±º¿¡¼­ ¼öÃà·üÀÌ ³·°Ô ³ªÅ¸³µ´Ù. ÁßÇÕ ÈÄ 1ºÐ°ú 10ºÐ¿¡¼­ÀÇ ¼±¼öÃà·üÀ» ºñ±³ÇØ º» °á°ú Åë»óÀûÀÎ ±¤Á¶»ç¹ýÀ» »ç¿ëÇÑ ¥°±º°ú ¥±±º¿¡ ºñÇØ 2´Ü°è ±¤Á¶»ç¹ýÀ» »ç¿ëÇÑ ¥²±º¿¡¼­ À¯ÀÇÇÏ°Ô ³·Àº ¼öÃà·üÀ» ³ªÅ¸³»¾ú´Ù(p<0.05). ¹Ì¼¼°æµµ ÃøÁ¤°á°ú »ó¸é°ú Çϸ鿡¼­ ¸ðµÎ °¢ ±º°£¿¡ À¯ÀÇÇÑ Â÷À̸¦ ¹ß°ßÇÒ ¼ö ¾ø¾ú´Ù.
The purpose of this study was to evaluate the linear polymerization shrinkage(%) and microhardness of composite resin(Z-100. 3M. USA) according to 2-step light curing method. Conventional light curing unit(Curing Light 2500, 3M, USA) and 2-step light curing unit(Elipar Highlight, ESPE, Germany) wen, used as light source.
The strain gauge method was used for determination of polymerization shrinkage(%). Samples were divided by 3 groups according to light curing methods (Group I : 450mW/cm2, 40sec, Group II tN znIWcrn¢¥, 40sec, Group III : 150mW/cm¢¥, 10sec & 650mW/cm2, 30sec).
Preparations of acrylic molds were followed by filling and curing. Strain gauges attached to each sample were connected to a strainmeter. Measurements were recorded at each second for the total of 10 minutes including the periods of light application.
And microhardness of each group after 24hours from light irradiation were measured.
Obtained data were analyzed statistically using One-way ANOVA and/or Scheffe test.
The results of the present study can be summarized as follows:
1. Composite resin in acrylic molds showed the initial expansion at the early phase of polymerization. This was followed by the contraction with the rapid increase in volume during the first 60 seconds and gradually diminished as curing process continued.
2. The lowest linear polymerization shrinkage(%) was found in group IQ followed by group 1 . II during the measuring periods.
3. Group Ill using 2-step curing method showed statistically significant reduction of lineal polymerization shrinkage(%) compared with group I , II at 1 minute and 10 minutes from light irradiation p\0.05).
4. The microhardness values of each group not revealed significant difference.

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2´Ü°è ±¤Á¶»ç;ÁßÇÕ¼öÃà;½ºÆ®·¹ÀÎ °ÔÀÌÁö¹ý;º¹ÇÕ·¹Áø;2-step curing;Polymerization shrinkage;Strain gauge method;Composite resin

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