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POLYMERIZATION SHRINKAGE OF COMPOSITE RESINS CURED BY VARIABLE LIGHT INTENSITIES

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Àӹ̿µ, Á¶°æ¸ð, È«ÂùÀÇ,
¼Ò¼Ó »ó¼¼Á¤º¸
Àӹ̿µ ( Lim Mi-Young ) - ´Ü±¹´ëÇб³ Ä¡°ú´ëÇÐ º¸Á¸Çб³½Ç
Á¶°æ¸ð ( Cho Kyung-Mo ) - °­¸ª´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Á¸Çб³½Ç
È«ÂùÀÇ ( Hong Chan-Ui ) - ´Ü±¹´ëÇб³ Ä¡°ú´ëÇÐ º¸Á¸Çб³½Ç

Abstract

º» ¿¬±¸´Â ±¤ÁßÇÕÇü º¹ÇÕ·¹Áø ÁßÇÕ ½Ã ±âÁ¸ÀÇ ÁßÇÕ¹ý°ú °¡º¯±¤µµ ÁßÇÕÇüÀÎ soft start ÁßÇÕ¹ý ¹× exponential ÁßÇÕ¹ý °£ÀÇ ÁßÇÕ¼öÃàÈ¿°ú¸¦ ºñ±³ÇÏ°íÀÚ ÇÏ¿´´Ù. º» ¿¬±¸¸¦ À§ÇØ 3Á¾ÀÇ º¹ÇÕ·¹Áø (Synergy Duo Shade, Z250, Filtek Supreme) ¹× 3Á¾ÀÇ ±¤Á¶»ç±â (Spectrum 800, Elipar Highlight, Elipar Trilight)¸¦ »ç¿ëÇÏ¿´´Ù. ÃÑ ÁßÇսð£Àº 40ÃÊ·Î ÀÏÁ¤ÇÏ°Ô À¯ÁöÇÏ¿´À¸¸ç, ¼±Çü ÁßÇÕ¼öÃà·üÀÇ ÃøÁ¤Àº linometer¸¦ ÀÌ¿ëÇÏ¿´À¸¸ç, 90ÃÊ°£ÀÇ ¼±Çü ¼öÃà·üÀ» 0.5ÃÊ °£°ÝÀ¸·Î ÃøÁ¤ÇÏ¿´´Ù. Àç·áº°·Î °¢ ÁßÇÕ ¹æ¹ýº° ½Ã°£¿¡ µû¸¥ ÁßÇÕ¼öÃà·üÀ» one-way ANOVA test·Î ºÐ¼®ÇÏ¿© ÃÖÁ¾ ÁßÇÕ¼öÃà·ü¿¡ µµ´ÞÇÏ´Â ½Ã°£À» »êÃâÇÏ¿´°í, 90ÃÊ ÈÄ ÃÖÁ¾ ¼±Çü ÁßÇÕ¼öÃà·üÀ» two-way ANOVA test¸¦ ÀÌ¿ëÇÏ¿© Àç·á, ±¤Á¶»ç ¹æ¹ý, Àç·á ¹× ±¤Á¶»ç ¹æ¹ýÀÇ ±³È£ÀÛ¿ëÀÌ ÁßÇÕ¼öÃà¿¡ ¹ÌÄ¡´Â ¿µÇâÀÌ ÀÖ´ÂÁö¸¦ °ËÁõÇÏ¿´´Ù. ¶ÇÇÑ 90ÃʱîÁöÀÇ ¼±Çü ÁßÇÕ¼öÃà·ü¿¡ ´ëÇÑ 20ÃʱîÁöÀÇ ¼±Çü ÁßÇÕ¼öÃà·üÀÇ ºñ¸¦ two-way ANOVA·Î ºñ±³ÇÏ°í, °¢°¢ÀÇ Åë°èÄ¡¸¦ 95% Scheffe test·Î °ËÁõÇÏ¿´´Â¹Ù, ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù 1. SupremeÀ» Á¦¿ÜÇÑ ´Ù¸¥ ±º¿¡¼­´Â Àç·á ¹× ±¤Á¶»ç ¹æ¹ý¿¡ °ü°è¾øÀÌ ´ëºÎºÐÀÇ ÁßÇÕ ¼öÃàÀÌ ±¤Á¶»ç ÈÄ 20ÃÊ À̳»¿¡ ÀÌ·ç¾îÁ³´Ù (p < 0.05). 2. 90ÃÊ ÈÄ, ÃÖÁ¾ ÁßÇÕ¼öÃà·üÀº Àç·á (p = 0.000)¿Í ±¤Á¶»ç ¹æ¹ý (p = 0.003) ¸ðµÎ À¯ÀǼº ÀÖ´Â ¿µÇâÀ» ³¢ÃÆÀ¸³ª, Àç·á¿Í ±¤Á¶»ç ¹æ¹ý »óÈ£°£ÀÇ ÀÛ¿ëÀº ¿µÇâÀÌ ¾ø¾ú´Ù. 3. 90ÃÊ ÈÄ ÃÖÁ¾ ÁßÇÕ¼öÃà·üÀº ÃÑ ±¤¿¡³ÊÁö°¡ °¡Àå ³·Àº exponential ÁßÇÕ¹ý¿¡¼­ À¯ÀǼº ÀÖ°Ô ³·¾Ò´Ù (p < 0.05). 4. 20ÃʱîÁöÀÇ Ãʱ⠼öÃà·üÀº soft start¿Í exponentialÁßÇÕ¹ý µî °¡º¯±¤µµ ÁßÇÕÀÌ conventional ÁßÇÕ¹ý¿¡ ºñÇÏ¿© À¯ÀǼº ÀÖ°Ô ³·Àº ¼öÃà·üÀ» º¸¿´´Ù (p < 0.05). º» ½ÇÇè °á°ú¸¸À» Åä´ë·Î º¼ ¶§, °¡º¯±¤µµ ÁßÇÕ¹ýÀº Ãʱâ ÁßÇÕ¼öÃà ¼Óµµ¸¦ °¨¼Ò½ÃÄÑ ¼öÃàÀÀ·ÂÀ» °¨¼Ò½ÃŲ´Ù°í º¼ ¼ö ÀÖ´Ù. ±×·¯³ª ÃÑ Á¶»ç ±¤¿¡³ÊÁöÀÇ Â÷ÀÌ·Î ÀÎÇØ ±× ¹°¸®Àû ¼ºÁú¿¡ ¿µÇâÀÌ ÀÖÀ» ¼ö ÀÖÀ¸¹Ç·Î ÇâÈÄ ÀÌ¿¡ ´ëÇÑ ´õ ¸¹Àº °íÂûÀÌ ÇÊ¿äÇÒ °ÍÀ¸·Î »ç·áµÈ´Ù.

The purpose of this study was to compare the effect of exponential curing method with conventional curing and soft start curing method on polymerization shrinkage of composite resins. Three brands of composite resins (Synergy Duo Shade, Z250, Filtek Supreme) and three brands of light curing units (Spectrum 800, Elipar Highlight, Elipar Trilight) were used. 40 seconds curing time was given. The shrinkage was measured using linometer for 90 seconds. The effect of time on polymerization shrinkage was analysed by one-way ANOVA and the effect of curing modes and materials on polymerization shrinkage at the time of 90s were analysed by two-way ANOVA. The shrinkage ratios at the time of 20s to 90s were taken and analysed the same way. The results were as follows : 1. All the groups except Supreme shrank almost within 20s Supreme cured by soft start and exponential curing had no further shrinkage after 30s (p < 0.05). 2. Statistical analysis revealed that polymerization shrinkage varied among materials (p = 0.000) and curing modes (p = 0.003). There was no significant interaction between material and curing mode. 3. The groups cured by exponential curing showed the statistically lower polymerization shrinkage at 90s than the groups cured by conventional curing and soft start curing (p < 0.05). 4. The initial shrinkage ratios of soft start and exponential curing were statistically lower than conventional curing (p < 0.05). From this study, the use of low initial light intensities may reduce the polymerization rate and, as a result, reduce the stress of polymerization shrinkage.

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ÁßÇÕ¼öÃà;±¤µµ;Soft start ÁßÇÕ¹ý;Exponential ÁßÇÕ¹ý;ÁßÇÕ·ü
Polymerization shrinkage;Light intensities;Soft start;Exponential curing;Linometer;Polymerization rate

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