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THE EFFECT OF C-FACTOR AND VOLUME ON MICROLEAKAGE OF COMPOSITE RESIN RESTORATIONS WITH ENAMEL MARGINS

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±¸ºÀÁÖ ( Koo Bong-Joo ) - ´Ü±¹´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Á¸Çб³½Ç
½Åµ¿ÈÆ ( Shin Dong-Hoon ) - ´Ü±¹´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Á¸Çб³½Ç

Abstract

¿Íµ¿º®°ú º¹ÇÕ·¹Áø ¼öº¹¹°ÀÌ Á¢ÂøµÉ ¶§, º¹ÇÕ·¹ÁøÀÇ Ä¡Áú¿¡ ´ëÇÑ Á¢Âø·Â°ú ·¹Áø ÀÚüÀÇ ÁßÇÕ ½Ã ¹ß»ýÇÏ´Â ¼öÃàÀÀ·ÂÀÌ »óÃæÇÏ°Ô µÈ´Ù. ÀÌ·¯ÇÑ ¼öÃàÀÀ·ÂÀÇ Å©±â´Â ¿Íµ¿ÀÇ ÇüÅ¿ä¼Ò (C-factor)¿Í ¼öº¹¹°ÀÇ Ã¼Àû¿¡ ¿µÇâÀ» ¹Þ´Â´Ù. ÀÌ¿¡ º» ½ÇÇè¿¡¼­´Â ´ÜÀÏ º´ Á¢ÂøÁ¦¸¦ »ç¿ëÇÑ º¹ÇÕ·¹Áø ¼öº¹ ½Ã ¹ý¶ûÁú º¯¿¬¸¸À¸·Î ÀÌ·ç¾îÁø ¿Íµ¿ÀÇ C-factor¿Í üÀûÀÌ ¹Ì¼¼´©Ãâ¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» ¹Ì¼¼ Àü·ù ÃøÁ¤¹ýÀ» ÀÌ¿ëÇÏ¿© Á¤·®ÀûÀ¸·Î ºÐ¼®ÇÏ°í Æò°¡ÇÏ¿´´Ù. ¿¬¸¶±â¸¦ ÀÌ¿ëÇÏ¿© 40°³ÀÇ °ÇÀüÇÑ ¿ìÄ¡ Çù¸é¿¡ ÆíÆòÇÑ ¹ý¶ûÁú Ç¥¸éÀ» Çü¼ºÇÏ¿´´Ù. °¢°¢ 10°³ÀÇ Ä¡¾Æ¿¡ ¿øÅëÇü ¿Íµ¿À» Çü¼ºÇÏ¿´À¸¸ç, ¿Íµ¿ÀÇ ±íÀÌ¿Í Á÷°æ¿¡ µû¶ó 4°³ ±ºÀ¸·Î ºÐ·ùÇÏ¿´´Ù ( I±º: 1.5 mm ¡¿ 2.0 mm, II±º: 1.5 mm ¡¿ 6.0 mm, III±º: 2.0 mm ¡¿ 1.72 mm, IV±º: 2.0 mm ¡¿ 5.23 mm). °¢±â ¿Íµ¿ÀÇ C-factor´Â 4, 5.62, 2, 2.54¸¦ º¸¿´´Ù. »ê ºÎ½Ä ÈÄ ´ÜÀÏ º´ Á¢ÂøÁ¦ÀÎ BC PlusTM (Vericom, Korea)¸¦ Á¦Á¶»çÀÇ Áö½Ã¿¡ µû¶ó Àû¿ëÇÏ°í, ¹Ì¼¼È¥ÇÕÇü º¹ÇÕ·¹ÁøÀÎ DenfilTM (Vericom)À» ÃæÀüÇÏ¿´´Ù. 40Ãʾ¿ ±¤ÁßÇÕ ÈÄ Ä¡¾Æ¸¦ ½Ç¿Â¿¡¼­ Áõ·ù¼ö¿¡ 24½Ã°£ µ¿¾È º¸°üÇÑ ´ÙÀ½, Sof-Lex systemÀ» ÀÌ¿ëÇÏ¿© ¿¬¸¶ÇÏ¿´°í, 5¡É¿Í 55¡É¹üÀ§¿¡¼­ 500ȸ ¿­¼øȯÀ» ½ÃÇàÇÏ¿´´Ù. ÀÌÈÄ ¹Ì¼¼Àü·ù ÃøÁ¤À» À§ÇØ Ä¡¼ö°­ ³»¿¡ Áõ·ù¼ö¸¦ ä¿ì°í Ä¡±Ù´Ü°øÀ» ÅëÇØ 0.018 stainless wire¸¦ »ðÀÔÇÑ ÈÄ sticky wax·Î ±Ù÷ºÎ¸¦ ¹ÐºÀÇÏ¿´À¸¸ç, nail varnish¸¦ ¼öº¹¹°ÀÇ º¯¿¬¿¡¼­ 1 mm¸¦ Á¦¿ÜÇÑ Àüü Ä¡¸é¿¡ 2ȸ µµÆ÷ÇÏ¿´´Ù. ¹Ì¼¼´©ÃâÀÇ ÃøÁ¤Àº Àü±â È­ÇÐÀû ¹æ¹ýÀ» ÀÌ¿ëÇÏ¿© ÃøÁ¤ÇÏ¿´À¸¸ç, Åë°èÀû À¯ÀǼºÀº 95% À¯ÀÇ ¼öÁØÀÇ Two-way ANOVA·Î °ËÁõÇÏ¿© , ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù. 1. º¹ÇÕ·¹Áø ¼öº¹¹°ÀÇ Ã¼ÀûÀÌ ÀûÀº °ÍÀÌ Å« °Í¿¡ ºñÇØ ¹Ì¼¼´©Ãâµµ°¡ Àû¾úÀ¸³ª, Åë°èÇÐÀûÀ¸·Î À¯ÀÇÇÑ Â÷ÀÌ´Â ¾ø¾ú´Ù. 2. ¿Íµ¿ ÇüÅÂ¿Í ¿¬°üµÈ C-factor´Â º¹ÇÕ·¹Áø ¼öº¹¹°ÀÇ ¹Ì¼¼´©Ãâµµ¿¡ ¿µÇâÀ» ÁÖÁö ¾Ê¾Ò´Ù. ¹ý¶ûÁú º¯¿¬À» °®´Â ¿Íµ¿¿¡ ´ÜÀÏ º´ Á¢ÂøÁ¦¸¦ »ç¿ëÇÑ º» ½ÇÇè¿¡¼­´Â º¹ÇÕ·¹ÁøÀÇ ÁßÇÕ ½Ã ¹ß»ýÇÏ´Â ¼öÃàÀÀ·Â¿¡ ¿µÇâÀ» ¹ÌÄ¡´Â °ÍÀ¸·Î ¾Ë·ÁÁø ¼öº¹¹°ÀÇ Ã¼Àû°ú C-factor°¡ ¹Ì¼¼´©Ãâµµ¿¡ ¿µÇâÀ» ÁÖÁö ¸øÇÏ¿´´Ù. ÀÌ´Â ¹ý¶ûÁú°ú Á¢Âø½Ã½ºÅÛ°úÀÇ °­·ÂÇÑ Á¢Âø·Â¿¡ ±âÀÎÇÑ °ÍÀ¸·Î º¸À̸ç, ¾ÕÀ¸·Î ÀÌ¿¡ ´ëÇÑ ´õ ¸¹Àº ¿¬±¸°¡ ÇÊ¿äÇÒ °ÍÀ¸·Î »ç·áµÈ´Ù.

Competition will usually develop between the opposing walls as the restorative resin shrinks during polymerization. Magnitude of this phenomenon may be depended upon cavity configuration and volume. The purpose of this sturdy was to evaluate the effect of cavity configuration and volume on microleakage of composite resin restoration that has margins on the enamel site only. The labial enamel of forty bovine teeth was ground using a model trimmer to expose a flat enamel surface. Four groups with cylindrical cavities were defined, according to volume and configuration factor(Depth x Diameter / C-factor) - Group I : 1.5 mm ¡¿ 2.0 mm / 4.0, Group II : 1.5 mm ¡¿ 6.0 mm / 2.0, Group III : 2.Omm ¡¿ 1.72 mm / 5.62, Group IV : 2.0 mm ¡¿ 5.23 mm / 2.54. After treating with fifth-generation one-bottle adhesive - BC PlusTM (Vericom, AnYang, Korea), cavities were bulk flted with microhybrid composite resin - DenfillTM (Vericom). Teeth were stored in distilled water for one day at room temperature and were finished and polished with Sof-Lex system. Specimens were thermocycled 500 times between 5¡É and 55¡É for 30 second at each temperature. Teeth were isolated with two layers of nail varnish except the restoration surface and 1 mm surrounding margins. Electrical conductivity (muA) was recorded in distilled water by electrochemical method. Microleakage scores were compared and analyzed using two-way ANOVA at 95% level. The results were as follows: 1. Small cavity volume showed lower microleakage score than large one, however, there was no statistically significant difference. 2. There was no relationship between cavity configuration and microleakage. Factors of cavity configuration and volume did not affect on microleakage of resin restorations with enamel margins only.

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Polymerization shrinkage;Configuration factor;Volume Electrical conductivity; Microleakage

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