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Influence of porcelain re-firing on the formation of surface bubble and on the change in shade of metal-ceramic crown exposed to artificial saliva

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¹ÚÁöÇö ( Park Ji-Hyun ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Ã¶Çб³½Ç
¿©Àμº ( Yeo In-Sung ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Ã¶Çб³½Ç
±è¼ºÈÆ ( Kim Sung-Hun ) - ¼­¿ï´ëÇб³ Ä¡ÀÇÇдëÇпø Ä¡°úº¸Ã¶Çб³½Ç
ÇÑÁß¼® ( Han Jung-Suk ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Ã¶Çб³½Ç
ÀÌÀçºÀ ( Lee Jai-Bong ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Ã¶Çб³½Ç
¾çÀçÈ£ ( Yang Jae-Ho ) - ¼­¿ï´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Ã¶Çб³½Ç

Abstract

¿¬±¸ ¸ñÀû: º» ¿¬±¸¿¡¼­´Â ÀΰøŸ¾×¿¡ ³ëÃâµÇ¾ú´ø ±Ý¼ÓµµÀç ¼öº¹¹°ÀÇ Àç¼Ò¼ºÀÌ µµÀç Ç¥¸éÀÇ »öÁ¶¿Í Ç¥¸é±âÆ÷¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» ¾Ë¾Æº¸°íÀÚ ÇÑ´Ù.

¿¬±¸ Àç·á ¹× ¹æ¹ý: Áö¸§ 10 mm, µÎ²² 0.5 mmÀÇ metal copingÀ» µð½ºÅ© ÇüÅ·ΠÁ¦ÀÛÇÑ ÈÄ µµÀ縦 Ã༺ÇÏ¿© ±Ý¼Ó µµÀç ¼öº¹¹°À» Á¦ÀÛÇÑ ÈÄ, Ç¥¸éÀÇ »öÁ¶¸¦ spectroradiometer¸¦ ÀÌ¿ëÇÏ¿© ÃøÁ¤ÇÏ°í, Ç¥¸é±âÆ÷ÀÇ ¼ö¿Í Å©±â¸¦ ½ÇüÇö¹Ì°æÀ¸·Î ÃøÁ¤ÇÏ¿´´Ù. ÀΰøŸ¾×¿¡ 7ÀÏ°£ ´ã±Ù ÈÄ glazing firing °úÁ¤¿¡ µû¶ó Àç¼Ò¼ºÇÏ¿´°í, Àç¼Ò¼º ÈÄÀÇ Ç¥¸é »öÁ¶, Ç¥¸é±âÆ÷ÀÇ ¼ö¿Í Å©±â¸¦ ÃøÁ¤ÇÏ¿´´Ù. Àç¼Ò¼º ÀüÈÄÀÇ »öÁ¶ Â÷ÀÌ´Â ¡âE·Î Ç¥ÇöÇÏ¿´°í, Ç¥¸é±âÆ÷ÀÇ ¼ö´Â paired t-test, Ç¥¸é±âÆ÷ÀÇ Å©±â´Â student t-test·Î ºÐ¼®ÇÏ¿´´Ù (¥á= 0.05).

°á°ú: ¼Ò¼º ÀüÈÄ ÃøÁ¤ÇÑ CIE Lab °ªÀ» ÀÌ¿ëÇÏ¿© °è»êÇÑ °á°ú, ¡âE = 2.14 ·Î °üÂûµÇ¾ú´Ù. °¢ ½ÃÆí³»ÀÇ Ç¥¸é±âÆ÷ °³¼ö´Â ¼Ò¼º Àü 1.33 ¡¾ 1.49 °³, ¼Ò¼º ÈÄ 3.27 ¡¾ 2.90 °³·Î ÃøÁ¤µÇ¾úÀ¸¸ç, ¼Ò¼º ÈÄ Ç¥¸é±âÆ÷ °³¼ö´Â Åë°èÀûÀ¸·Î À¯ÀÇÇÏ°Ô Áõ°¡ÇÏ¿´´Ù (P<.05). °¢ ½ÃÆí³»ÀÇ Ç¥¸é±âÆ÷ Å©±â´Â ¼Ò¼º Àü 81.97 ¡¾ 32.03 §­, ¼Ò¼º ÈÄ 142.94 ¡¾ 47.40 §­·Î ÃøÁ¤µÇ¾úÀ¸¸ç, ¼Ò¼º ÈÄ Ç¥¸é±âÆ÷ Å©±â´Â Åë°èÀûÀ¸·Î À¯ÀÇÇÏ°Ô Áõ°¡ÇÏ¿´´Ù (P<.05).

°á·Ð: ¼Ò¼º ÀüÈÄÀÇ »öº¯È­°¡ ÀÎÁöµÇ±â´Â ÇÏÁö¸¸, ÀÓ»óÀûÀ¸·Î Çã¿ëÇÒ ¼ö ÀÖ´Â Á¤µµ¿´´Ù. Àç¼Ò¼ºÀ¸·Î µµÀç Ç¥¸é±âÆ÷ÀÇ °³¼ö¿Í Å©±â°¡ À¯ÀÇÇÏ°Ô Áõ°¡ÇÏ´Â °ÍÀ¸·Î ³ªÅ¸³ª¼­, µµÀçÀÇ ±¸°­ ¿Ü ¼ö¸® ½Ã¿¡ ¹ß»ýÇϴ ǥ¸é ±âÆ÷¸¦ ÁÙÀ̱â À§ÇÑ ¿¬±¸°¡ ÇÊ¿äÇÒ °ÍÀ¸·Î »ç·áµÈ´Ù.

PURPOSE: The purpose of this study was to evaluate the influence of porcelain re-firing on the formation of surface bubble and on the change in shade of metal-ceramic crown exposed to artificial saliva.

MATERIALS AND METHODS: Thirty disk-shaped specimens were made in 10 mm diameter with 0.5 mm metal core thickness and 1 mm ceramic thickness. A spectroradiometer was used to determine the CIE Lab coordinates. The number and size of surface bubble were observed with a stereomicroscope. After the exposure to artificial saliva for 7 days, re-firing was performed at glazing temperature. After re-firing, the CIE Lab were calculated, and the number and size of surface bubble were observed again. The change in shade was expressed with ¡âE . Statistical analysis was done with paired t-test for the change in the number of surface bubble and student t-test for the change in the size of surface bubble (¥á= 0.05).

RESULTS: Shade difference was calculated 2.14 ¡âE units. The mean number of surface bubble was 1.33 ¡¾ 1.49 before re-firing, 3.27 ¡¾ 2.90 after re-firing. After re-firing, the number of surface bubble was significantly increased (P<.05). The mean size of surface bubble was 81.97 ¡¾ 32.03 §­ before re-firing, 142.94 ¡¾ 47.40 §­ after re-firing. After re-firing, the size of surface bubble was significantly increased (P<.05).

CONCLUSION: Shade change after re-firing was perceptible (¡âE < 2.0) and clinically acceptable (¡âE < 3.7). The number and size of surface bubble was significantly increased after re-firing. Further investigation to decrease the surface bubble on the extra oral repair of metal-ceramic crown, will be needed in future study.

Å°¿öµå

±Ý¼ÓµµÀç°ü; Àç¼Ò¼º; »öÁ¶; Ç¥¸é±âÆ÷
Metal ceramic crown; Re-firing; Shade; Surface bubble

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