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EFFECT OF INSTRUMENT COMPLIANCE ON THE POLYMERIZATION SHRINKAGE STRESS MEASUREMENTS OF DENTAL RESIN COMPOSITES

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¼­´ö±Ô ( Seo Deog-Gyu ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Á¸Çб³½Ç
¹Î¼±È« ( Min Sun-Hong ) - ¼­¿ï´ëÇб³ Ä¡ÀÇÇдëÇпø Ä¡°úº¸Á¸Çб³½Ç
ÀÌÀκ¹ ( Lee In-Bog ) - ¼­¿ï´ëÇб³ Ä¡ÀÇÇдëÇпø Ä¡°úº¸Á¸Çб³½Ç

Abstract

º» ¿¬±¸¿¡¼­´Â ÃøÁ¤ÀåÄ¡ÀÇ complianceÀ¯¹«°¡ º¹ÇÕ·¹ÁøÀÇ ÁßÇÕ¼öÃàÀÀ·Â ÃøÁ¤¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» ¾Ë¾Æº¸¾Ò´Ù. º¯À§¼¾¼­, cantilever load cell°ú ºÎ±Ëȯ (negative feedback) ½Ã½ºÅÛÀ» Àû¿ëÇÏ¿© compliance¸¦ Çã¿ëÇÏ´Â °Í°ú Çã¿ëÇÏÁö ¾Ê´Â µÎ °¡Áö ¸ðµå·Î ÁßÇÕ¼öÃàÀÀ·ÂÀÇ ÃøÁ¤ÀÌ °¡´ÉÇÑ stress-strain analyzer¸¦ Á¦ÀÛÇÏ¿´´Ù. ÇÑ Á¾ÀÇ flowable (Filtek Flow: FF) º¹ÇÕ·¹Áø°ú µÎ Á¾ÀÇ universal hybrid (Z100: Z1 and Z250: Z2) º¹ÇÕ·¹ÁøÀÌ »ç¿ëµÇ¾ú´Ù. Load cellÀÇ ³¡°ú base plate¿¡ °íÁ¤µÈ Á÷°æ 3.0 mmÀÇ ±Ý¼Ó ¸·´ë¿¡ silaneÀ» ó¸®ÇÏ¿´´Ù. 1.0 mmÀÇ °Å¸®·Î °íÁ¤ÇÑ µÎ °³ÀÇ ±Ý¼Ó ¸·´ë »çÀÌ ¿¡ º¹ÇÕ·¹ÁøÀ» Àû¿ëÇÑ ÈÄ ±¤ÁßÇÕÀ» ÇÏ¿´´Ù. º¹ÇÕ·¹ÁøÀÇ ¼öÁ÷ ÁßÇÕ¼öÃà·ü°ú ÁßÇÕ¼öÃàÀÀ·ÂÀ» 10 ºÐ µ¿¾È ±â·ÏÇÏ¿´°í ÀÎÀåź¼º°è¼öµµ ±¸ÇÏ¿´´Ù. Åë°è󸮴 ÀÏ¿øºÐ»êºÐ¼®°ú paired t-test¸¦ ½ÃÇàÇÏ¿´°í 95% À¯ÀǼöÁØ¿¡¼­ Tukey¡¯s test·Î »çÈÄ °ËÁ¤ÇÏ¿´´Ù. ÃøÁ¤µÈ ÁßÇÕ¼öÃà ÀÀ·ÂÀº Àç·á¿Í complianceÀÇ À¯¹«¿¡ µû¶ó Å« Â÷À̸¦ º¸¿´´Ù. Compliance¸¦ Çã¿ëÇÑ ¸ðµå¿¡¼­ ÁßÇÕ¼öÃàÀÀ·ÂÀº FF: 3.11 (0.13)ÀÌ °¡Àå ÄÇÀ¸¸ç Z1: 2.91 (0.10), Z2: 1.94 (0.09) MpaÀÇ ¼ø¼­¿´´Ù. ÃøÁ¤ÀåÄ¡ÀÇ compliance¸¦ Çã¿ëÇÏÁö ¾ÊÀº °æ¿ì¿¡´Â Z1 17.08 (0.89)ÀÌ °¡Àå ÄÇ°í FF: 10.11 (0.29), Z2: 9.46 (1.63) MPaÀÇ ¼øÀ̾ú´Ù. ¶ÇÇÑ Z1, Z2, FFÀÇ ÀÎÀåź¼º°è¼ö´Â °¢°¢ 2.31 (0.18), 2.05 (0.20), 1.41 (0.11) GPa À̾ú´Ù. ÁßÇÕ¼öÃàÀÀ·ÂÀº compliance mode¿¡¼­´Â º¹ÇÕ·¹ÁøÀÇ ¼öÁ÷ ÁßÇÕ¼öÃà·üÀÌ ÁÖ¿ä ¿µÇâ ¿äÀÎÀ̾úÀ¸¸ç, compliance¸¦ ¹èÁ¦ÇÑ ¸ðµå¿¡¼­´Â ź¼º°è¼öÀÇ È¿°ú°¡ Áö¹èÀûÀ̾ú´Ù.

The purpose of this study was to evaluate the effect of instrument compliance on the polymerization shrinkage stress measurements of dental composites. The contraction strain and stress of composites during light curing were measured by a custom made stress-strain analyzer, which consisted of a displacement sensor, a cantilever load cell and a negative feedback mechanism. The instrument can measure the polymerization stress by two modes: with compliance mode in which the instrument compliance is allowed, or without compliance mode in which the instrument compliance is not allowed. A flowable (Filtek Flow: FF) and two universal hybrid (Z100: Z1 and Z250: Z2) composites were studied. A silane treated metal rod with a diameter of 3.0 mm was fixed at free end of the load cell, and other metal rod was fixed on the base plate. Composite of 1.0 mm thickness was placed between the two rods and light cured. The axial shrinkage strain and stress of the composite were recorded for 10 minutes during polymerization. and the tensile modulus of the materials was also determined with the instrument. The statistical analysis was conducted by ANOVA. paired t-test and Tukey¡¯s test (¥á<0.05). There were significant differences between the two measurement modes and among materials. With compliance mode, the contraction stress of FF was the highest: 3.11 (0.13). followed by Z1: 2.91 (0.10) and Z2: 1.94 (0.09) MPa. When the instrument compliance is not allowed, the contraction stress of Z1 was the highest: 17.08 (0.89), followed by FF: 10.11 (0.29) and Z2: 9.46 (1.63) MPa. The tensile modulus for Z1, Z2 and FF was 2.31 (0.18), 2.05 (0.20), 1.41 (0.11) GPa, respectively. With compliance mode. the measured stress correlated with the axial shrinkage strain of composite: while without compliance the elastic modulus of materials played a significant role in the stress measurement.

Å°¿öµå

º¹ÇÕ·¹Áø;ÁßÇÕ¼öÃàÀÀ·Â;Instrument compliance;ºÎ±Ëȯ;ÀÎÀåź¼º°è¼ö
Dental composites;Polymerization shrinkage stress;Instrument compliance;Negative feed-back system;Tensile modulus

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