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EFFECT OF STEP CURING ON THE CONTRACTION STRESS AND MARGINAL ADAPTATION OF RESIN RESTORATION

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¹ÚÁ¾ÈÖ ( Park Jong-Whi ) - Á¶¼±´ëÇб³ Ä¡°ú´ëÇÐ ¼Ò¾ÆÄ¡°úÇб³½Ç
À̳­¿µ ( Lee Nan-Young ) - Á¶¼±´ëÇб³ Ä¡°ú´ëÇÐ ¼Ò¾ÆÄ¡°úÇб³½Ç
ÀÌ»óÈ£ ( Lee Sang-Ho ) - Á¶¼±´ëÇб³ Ä¡°ú´ëÇÐ ¼Ò¾ÆÄ¡°úÇб³½Ç

Abstract

º» ¿¬±¸´Â ´Ü°èº° ±¤ÁßÇÕ ¹æ¹ýÀÌ º¹ÇÕ·¹ÁøÀÇ ÁßÇÕ ¹× ¼öÃà ÀÀ·Â¿¡ ¹ÌÄ¡´Â È¿°ú¸¦ ºñ±³, Æò°¡ÇÏ°íÀÚ ÀÚ¿¬Ä¡¸¦ ´ë»óÀ¸·Î ¿Íµ¿À» Çü¼ºÇÏ°í ÇÒ·Î°Õ ±¤ÁßÇÕ±â¿Í LED ±¤ÁßÇÕ±âÀÇ Åë¹ý¿¡ ÀÇÇÑ ¿¬¼Ó Á¶»ç ¹× ´Ü°èº° Á¶»ç¹ýÀ¸·Î °¢°¢ º¹ÇÕ·¹ÁøÀ» ÁßÇÕ½ÃŲ ÈÄ ¼öÃà ÀÀ·ÂÀ» ÃøÁ¤ÇÏ°í ÁÖ»çÀüÀÚÇö¹Ì°æÀ» ÅëÇØ ¼öº¹¹°°ú ¿Íµ¿ÀÇ °è¸éºÎ¿¡¼­ Á¢Âø »óŸ¦ °üÂûÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù.

1. ¸ðµç ±º¿¡¼­ ±¤ÁßÇÕ Á÷ÈÄ¿¡´Â ÀϽÃÀûÀ¸·Î ÆØâµÇ¾ú´Ù°¡ Ãʱ⿡´Â ±Þ°ÝÇÑ ¼öÃà ÀÀ·ÂÀÇ Áõ°¡¸¦ º¸¿´°í ½Ã°£ÀÌ °æ°úµÉ¼ö·Ï ¼öÃà ÀÀ·ÂÀÇ Áõ°¡°¡ ¿Ï¸¸ÇØÁö´Â °æÇâÀ» º¸¿´´Ù(P<0.05).

2. µ¿ÀÏÇÑ ±¤Á¶»ç ±º³»¿¡¼­´Â hybridÇüÀÎ Filtek Z-250¢â±ºº¸´Ù´Â flowableÇüÀÎ Filtex flow¢â±ºÀÌ ´õ ÀûÀº ¼öÃà ÀÀ·ÂÀ» º¸¿´´Ù.

3. Filtek Z-250¢â±º¿¡¼­´Â LED ´Ü°èº° Á¶»ç±ºÀÌ ¼öÃà ÀÀ·ÂÀÌ °¡Àå Àû°Ô ³ªÅ¸³µ´Ù.(P<0.05).

4. Filtek flow¢â±º ¿ª½Ã LED ´Ü°èº° Á¶»ç±ºÀÌ ¼öÃà ÀÀ·ÂÀÌ °¡Àå ÀÛ°Ô ³ªÅ¸³µÀ¸³ª(P<005) Filtek Z-250±º¿¡¼­¿Í °°ÀÌ ´Ù¸¥ Á¶»ç±º¿¡ ºñÇØ ¸¹Àº Â÷À̸¦ º¸¿©ÁÖÁö´Â ¸øÇß´Ù.

5. ÁÖ»çÀüÀÚÇö¹Ì°æÀ¸·Î °üÂûÇÑ º¹ÇÕ·¹Áø°ú ¿Íµ¿º®°úÀÇ Á¢ÇÕ »óÅ´ ±ä¹ÐÇÑ »óŸ¦ º¸¿´À¸³ª LED Á¶»ç±º¿¡¼­ ÀϺΠƴÀÌ °üÂûµÇ¾ú´Ù.

ÀÌ»óÀÇ °á°ú¸¦ Á¾ÇÕÇØ º¸¸é hybridÇü º¹ÇÕ·¹ÁøÀÇ °æ¿ì ´Ü°èº° ÁßÇÕ¹æ½ÄÀ» »ç¿ëÇÒ °æ¿ì ´ÜÀϱ¤µµÀÇ ÁßÇÕ¹æ½Ä¿¡ ºñÇØ ¼öÃàÀÀ·ÂÀ» °¨¼Ò½Ãų ¼ö ÀÖ°í ÀûÀýÇÑ º¯¿¬ ÀûÇÕ»óŸ¦ À¯Áö½ÃÅ´À¸·Î½á ÀÓ»óÀûÀ¸·Î °í±¤µµ LED ±¤ÁßÇÕ±âÀÇ °æ¿ì ´Ü°èº° ÁßÇÕ¹æ½ÄÀÇ »ç¿ëÀÌ À¯¸®ÇÏ´Ù°í »ç·áµÈ´Ù.

The purpose of this study was to inverstigate the effect of step-curing mode on polymerization shrinkage and contraction of composite resion restoration. Class I cavities were prepared on the extracted human premolars. The cavities were filled with Filtek Z-250¢â(hybrid resin, 3M ESPE, USA) and Filtek flow¢â(flowable resin, 3M ESPE, USA) and cured with one of the following irradiation modes; Halogen 40sec with continuous curing, LED 10sec with continuous curing, and LED 13sec with step-curing.

Contraction stress was measured with strain gauge which was connected to TML Datalogger¢â(TDS-102, SOKKI, Japan) and resion-dentin interfaces were observed by scanning electron microscope.

The results of present study can be summarized as follows:

1. Composite resion restoration showed transient expansion just after irradiation of curing light. Contraction stress was increased rapidly at the early phase of polymerization and reduced slowly as time elapsed(P<0.05).

2. Filtek flow¢â showed lower contraction stress than Filtek Z-250¢â regardless of curing modes.

3. LED step-curing mode showed lowest contraction stress in Filtek Z-250¢â compared with other curing modes(P<0.05).

4. LED step-curing mode showed lowest contraction stress in Filtek flow¢â compared with other curing modes(P<0.05), but difference in contraction stress was not go greate as in Filtek Z-250¢â.

5. Polymerization of composite resion by LED light with step-curing mode and halogen light with continuous mode resulted in better marginal sealing than LED light with continuous mode.

Å°¿öµå

º¹ÇÕ·¹Áø;±¤ÁßÇÕ;ÁßÇÕ ¼öÃà;¼öÃà ÀÀ·Â;´Ü°èº° ÁßÇÕ
Light curing;Polymerization shrinkage;Contraction stress;Step-curing;LED

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