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CUSPAL DEFLECTION IN CLASS V CAVITIES RESTORED WITH COMPOSITE RESINS

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¹ÚÁرÔ, ÀÓ¹ü¼ø, ÀÌÀκ¹,
¼Ò¼Ó »ó¼¼Á¤º¸
¹ÚÁرԠ( Park Joon-kyu ) - ¼­¿ï´ëÇб³ Ä¡ÀÇÇдëÇпø Ä¡°úº¸Á¸Çб³½Ç
ÀÓ¹ü¼ø ( Lim Bum-Soon ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°ú»ýüÀç·á°úÇб³½Ç
ÀÌÀκ¹ ( Lee In-Bog ) - ¼­¿ï´ëÇб³ Ä¡ÀÇÇдëÇпø Ä¡°úº¸Á¸Çб³½Ç

Abstract

º» ¿¬±¸ÀÇ ¸ñÀûÀº º¹ÇÕ·¹ÁøÀÇ ÁßÇÕ¼öÃà°ú ź¼º°è¼ö°¡ 5±Þ ¿Íµ¿ ¼öº¹½Ã ±³µÎ±¼°î¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» Æò°¡Çϱâ À§ÇÔÀÌ´Ù. 16°³ÀÇ ¹ßÄ¡µÈ »ó¾Ç ¼Ò±¸Ä¡¸¦ Æò±Õ Å©±â°¡ ºñ½ÁÇÏ°Ô 2°³ÀÇ groupÀ¸·Î ºÐ·ùÇÏ¿´´Ù. °¢°¢ÀÇ Ä¡¾Æ¿¡ 5±Þ ¿Íµ¿À» Çü¼ºÇÏ¿© À¯µ¿¼º º¹ÇÕ·¹Áø (Filtek flow)°ú Àü±¸Ä¡ ¼öº¹¿ë hybridº¹ÇÕ·¹Áø (Z-250)À¸·Î °¢ groupÀ» ÃæÀüÇÏ¿´À» ¶§ ³ªÅ¸³ª´Â ±³µÎ±¼°îÀ» ÃøÁ¤ÇÏ¿´À¸¸ç ±× ÈÄ ¼öº¹´Ü¸éÀ» ÁÖ»çÀüÀÚÇö¹Ì°æ (SEM)À¸·Î °üÂûÇÏ¿´´Ù. °¢ º¹ÇÕ·¹ÁøÀÇ ÁßÇÕ¼öÃà·ü°ú ź¼º°è¼ö¸¦ ÃøÁ¤ÇÏ¿© ±³µÎ±¼°î¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» °íÂûÇÏ¿´°í ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù. 1. Filtek flow¿Í Z-250À¸·Î ÃæÀüÇÑ group¿¡¼­ ±³µÎ±¼°î·®Àº °¢°¢ ¿Í À¸·Î ³ªÅ¸³ª Filtek flowÀÇ Æò±Õ ±³µÎ±¼°î·®ÀÌ ´õ ÀÛÀº °ÍÀ¸·Î ÃøÁ¤µÇ¾úÀ¸³ª Åë°èÀû À¯ÀǼºÀº º¸ÀÌÁö ¾Ê¾Ò´Ù (p > 0.05). 2. ¼öº¹´Ü¸éÀÇ SEM °üÂû °á°ú µÎ groupÀÇ ½ÃÆí Áß °¢°¢ 2°³ÀÇ ½ÃÆí¿¡¼­ ¿Íµ¿ ³»¸é¿¡ Á¢ÂøÀÌ Å»¶ôµÈ ¹Ì¼¼°£°ÝÀÌ °üÂûµÇ¾ú´Ù. 3. Filtek flowÀÇ Åº¼º°è¼ö°£Àº 7.77 GPa·Î Z-250ÀÇ 17.43 GPa¿¡ ºñÇØ Àý¹Ý ÀÌ»ó ³·¾ÒÀ¸¸ç ÁßÇÕ¼öÃà·üÀº 4.41%·Î Z-250ÀÇ 2.23%¿¡ ºñÇØ ´õ Å« °ÍÀ¸·Î ³ªÅ¸³µ´Ù. 4. ±³µÎ±¼°î¿¡´Â º¹ÇÕ·¹ÁøÀÇ ÁßÇÕ¼öÃà·ü »Ó¸¸ ¾Æ´Ï¶ó ¼öÃàÀÀ·ÂÀÇ ¹ßÇö¿¡ ¿µÇâÀ» Áִ ź¼º°è¼ö°¡ º¹ÇÕÀûÀ¸·Î ÀÛ¿ëÇÔÀ» ¾Ë ¼ö ÀÖ¾ú´Ù

The purpose of this study was to evaluate the effect of the polymerization shrinkage and modulus of elasticity of composites on the cusp deflection of class V restoration in premolars. The sixteen extracted upper premolars were divided into 2 groups with similar size. The amounts of cuspal deflection were measured in Class V cavities restored with a flowable composite (Filtek flow) or a universal hybrid composite (Z-250). The bonded interfaces of the sectioned specimens were observed using a scanning electron microscopy (SEM). The polymerization shrinkage and modulus of elasticity of the composites were measured to find out the effect of physical properties of composite resins on the cuspal deflection. The results were as follows. 1. The amounts of cuspal deflection restored with Filtek flow or Z-250 were and , respectively. Filtek flow showed less cuspal deflection but there was no statistically significant difference (p > 0.05). 2. The two specimens in each group showed gap at the inner portion of the cavity. 3. The polymerization shrinkages of Filtek flow and Z-250 were 4.41% and 2.23% respectively, and the flexural modulus of elasticity of cured Filtek flow (7.77 GPa) was much lower than that of Z-250 (17.43 GPa). 4. The cuspal deflection depends not only on the polymerization shrinkage but also on the modulus of elasticity of composites.

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±³µÎ±¼°î;º¹ÇÕ·¹Áø;ÁßÇÕ¼öÃà·ü;ź¼º°è¼ö;Á¢Âø°è¸é
Cuspal deflection;Composite resin;Polymerization shrinkage;Modulus of elasticity;Bonded interface

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