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The effect of repeated firings on the color of zirconia-based all-ceramic system

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ÀåÁ¤Àº ( Jang Jung-Eun ) - ºÎ»ê´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Ã¶Çб³½Ç
±è¹«Çö ( Kim Mu-Hyon ) - ºÎ»ê´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Ã¶Çб³½Ç
À±¹ÌÁ¤ ( Yun Mi-Jung ) - ºÎ»ê´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Ã¶Çб³½Ç
ÀüÀ±°æ ( Jeon Yun-Kyung ) - ºÎ»ê´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Ã¶Çб³½Ç
ÀüÀ¯Áø ( Jeon You-Jin ) - ºÎ»ê´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Ã¶Çб³½Ç

Abstract

¿¬±¸ ¸ñÀû: °¢°¢ ´Ù¸¥ ¹æ¹ýÀ¸·Î »öÁ¶¸¦ ºÎ¿©ÇÑ ¼¼ °¡Áö Áö¸£ÄÚ´Ï¾Æ ÀüºÎµµÀç°ü¿¡¼­ ¹Ýº¹¼Ò¼ºÀÌ ÀüºÎµµÀç°üÀÇ »öÁ¶¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» ºñ±³, °üÂûÇÏ¿´´Ù.

¿¬±¸ Àç·á ¹× ¹æ¹ý: Áö¸£ÄÚ´Ï¾Æ Äھ ¼¼°¡Áö ¹æ¹ýÀ¸·Î Âø»ö(KW±º: Masking liner¸¦ »ç¿ëÇÏ¿© ÇϺΠÄÚ¾î»ö Â÷´Ü, KI±º: Áö¸£ÄÚ´Ï¾Æ Äھ ±Ý¼Ó »êÈ­¹° ¿ë¾×¿¡ ħÀü½ÃÄÑ Âø»ö, NM±º: Áö¸£ÄÚ´Ï¾Æ Äھ °í¿Â¿¡¼­ ¼Ò°áÇϱâ Àü¿¡ ±Ý¼Ó»êÈ­¹°°ú È¥ÇÕÇÏ¿© Âø»ö)ÇÏ¿© ¿ø¹ÝÇü ½ÃÆíÀ» Á¦ÀÛÇÏ¿´´Ù. Áö¸£ÄÚ´Ï¾Æ ÄÚ¾î »ó¹æ¿¡ A3 »öÁ¶ÀÇ »ó¾ÆÁú µµÀ縦 ¼Ò¼ºÇÏ°í 3, 5, 7ȸ ¹Ýº¹¼Ò¼º ÈÄ L*a*b* °ªÀ» ÃøÁ¤ÇÏ¿© ºñ±³ÇÏ°í ´Ù¸¥ µÎ °¡Áö »öÀÇ 3Â÷¿ø °ø°£¿¡¼­ÀÇ °Å¸®¸¦ ³ªÅ¸³»´Â »öÂ÷¹æÁ¤½ÄÀ» ÀÌ¿ëÇÏ¿© ºÐ¼®ÇÏ¿´´Ù. ÃøÁ¤µÈ °á°ú´Â ¹Ýº¹ÃøÁ¤ (repeated-measures ANOVA) ºÐ¼®¹ý°ú Tukey ´ÙÁß¹üÀ§ °ËÁõ¹ýÀ» »ç¿ëÇÏ¿© ¼Ò¼ºÈ½¼ö¿¡ µû¸¥ »öÁ¶º¯È­¸¦ À¯ÀǼöÁØ5%¿¡¼­ °ËÁ¤ÇÏ¿´´Ù.

°á°ú: 1. ¸ðµç ½ÇÇ豺¿¡¼­ ¹Ýº¹¼Ò¼º¿¡ µû¸¥ L*a*b*°ªÀÇ º¯È­°¡ °üÂûµÇ¾ú´Ù (P< .001). 2. ¹Ýº¹¼Ò¼ºÀ¸·Î L*°ª°ú a*°ª (KI±ºÁ¦¿Ü)Àº °¨¼ÒÇÏ°í b*°ª Àº Áõ°¡ÇÏ´Â °æÇâÀ» º¸¿´´Ù. 3. ¥ÄE°ªÀÌ 1ÀÌ»ó ³ªÅ¸³­ ¹Ýº¹¼Ò¼ºÈ½¼ö´ÂKW±º°ú KI±ºÀº 3ȸ ±×¸®°íNM±ºÀº 7ȸ¿´´Ù. 4. 7ȸ ¹Ýº¹¼Ò¼º ÈÄ ¥ÄE°ªÀº KI±º (¥ÄE = 2.26), KW±º (¥ÄE = 1.47) ±×¸®°íNM±º (¥ÄE =1.08) ¼øÀ¸·Î ³ô°Ô ³ªÅ¸³µ´Ù (P< .001).

°á·Ð: ¹Ýº¹¼Ò¼ºÀÌ Áö¸£ÄÚ´Ï¾Æ ÄÚ¾î »öÁ¶¸¦ ºÎ¿©¹æ¹ý¿¡ µû¶ó ÀüºÎµµÀç°üÀÇ »öÁ¶¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» ³¢ÃÆ´Ù.

PURPOSE: The aim of this study was to evaluate the effect of repeated firings on the color of zirconia restoration with different shading method.

MATERIALS AND METHODS: Three different types of zirconia frameworks (adding metallic pigments to the initial zirconia powder before sintering (Group NM), dipping the milled frameworks in dissolved coloring agents (Group KI), or application of liner material to the sintered white frameworks (Group KW) were used to support A3 shade dentin porcelain. Repeated firings (3, 5, or 7) were performed, color differences among ceramic specimens were measured using a colorimeter. Repeated measurements analysis of variance (ANOVA) was used to analyze the data for significant difference. The Tukey Honestly Significant Different (HSD) test was used to perform multiple comparisons (¥á= .05).

RESULTS: 1. L*a*b* values of the ceramic systems were affected by the number of firings (1, 3, 5 or 7 firings) (P < .001) and shading methods (P < .001). 2. As the number of firings increased, the L* (for all groups) and a* value (for KW and NM groups) decreased and the b* value(for all groups) increased. 3. The mean color differences caused by repeated firings were perceptible (¥ÄE > 1) for group KW and KI fired after 3 times, except for group NM fired after 7 times. 4. In order of decreasing ¥ÄE value fired after 7 times, the values were group KI(¥ÄE = 2.26) > group KW (¥ÄE = 1.47) > group NM (¥ÄE = 1.08) (P < .001).

CONCLUSION: Repeated firings influenced the color of the zirconium-oxide all-ceramic specimens with different shading methods.

Å°¿öµå

Áö¸£ÄڴϾÆ; Âø»ö; ¹Ýº¹¼Ò¼º; »öÁ¶
Zirconia; Shading; Repeated firings; Color

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