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Flexural strength and reliability of highly translucent colored zirconia

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°øÇöÁØ ( Kong Hyun-Jun ) - Wonkwang University College of Dentistry Department of Prosthodontics

Abstract

¸ñÀû: º» ¿¬±¸ÀÇ ¸ñÀûÀº ÀüºÎµµÀç ¼öº¹¹°À» À§ÇØ ´ÜÀÏü·Î »ç¿ëµÇ´Â °í¹ÝÅõ¸í À¯»ö Áö¸£ÄڴϾÆÀÇ ±ÁÈû°­µµ ¹× ½Å·Úµµ¸¦ Æò°¡Çϱâ À§ÇÔÀÌ´Ù.

¿¬±¸ Àç·á ¹× ¹æ¹ý: ÀüºÎµµÀç ¼öº¹¹°À» À§ÇØ »ç¿ëµÇ´Â ¹«»ö(A0) ¹× À¯»ö(A1, A3)ÀÇ °í¹ÝÅõ¸í Áö¸£ÄÚ´Ï¾Æ ºí·ÏÀ» »ç¿ëÇÏ ¿© ¹Ù ÇüÅÂÀÇ ½ÃÆí(25 ¡¿ 4 ¡¿ 2.5 mm)À» Á¦ÀÛÇÏ¿´´Ù. Áö¸£ÄÚ´Ï¾Æ ºí·ÏÀÇ »öÁ¶¿¡ µû¶ó 3°³ÀÇ ½ÇÇ豺À» ¼³Á¤ÇÏ¿´°í, ÇÑ ±º ´ç 20°³ÀÇ ½ÃÆíÀ» Á¦ÀÛÇÏ¿´´Ù. ±ÁÈû°­µµ´Â 3Á¡ ±ÁÈû½ÃÇèÀ» ÅëÇØ ÃøÁ¤ÇÏ¿´À¸¸ç, ÀÏ¿ø¹èÄ¡ ºÐ»êºÐ¼®À» ÀÌ¿ëÇÏ¿© »öÁ¶¿¡ µû ¸¥ Åë°èÀû À¯ÀǼºÀ» °ËÁõÇÏ¿´´Ù. ´ÙÀ½À¸·Î ¼¼¶ó¹Í Àç·á Ư¼º»ó ½Å·Úµµ¸¦ Æò°¡Çϱâ À§ÇØ ¿ÍÀÌºí ºÐ¼®À» ½ÃÇàÇÏ¿´À¸¸ç, X ¼± ȸÀýºÐ¼®À¸·Î ½ÃÆíÀÇ °áÁ¤Æ¯¼ºÀ» ºÐ¼®ÇÏ¿´´Ù.

°á°ú: ¹«»ö °í¹ÝÅõ¸í Áö¸£ÄڴϾÆÀÇ ±ÁÈû°­µµ(1127.10 MPa)°¡ »öÁ¶ A1 (995.71 MPa)°ú A3 (1016.42 MPa)¿¡ ºñÇØ Åë°è ÇÐÀûÀ¸·Î À¯ÀÇÇÏ°Ô ³ôÀº °ªÀ» º¸¿´´Ù(P < 0.05). »öÁ¶ A1°ú A3 »çÀÌ¿¡´Â À¯ÀÇÇÑ Â÷ÀÌ°¡ ¾ø¾ú´Ù(P > 0.05). ¿ÍÀÌºí ºÐ¼® À» ½ÃÇàÇÑ °á°ú, ¹«»ö °í¹ÝÅõ¸í Áö¸£ÄڴϾư¡ À¯»ö¿¡ ºñÇØ ³ôÀº ½Å·Úµµ¸¦ ³ªÅ¸³Â´Ù. X¼± ȸÀýºÐ¼® °á°ú ¸ðµç ±×·ì¿¡¼­ Áö ¸£ÄÚ´Ï¾Æ Á¤¹æÁ¤»óÀÇ Æ¯Â¡ÀûÀÎ ÇÇÅ©¸¦ º¸¿´´Ù.

°á·Ð: º» Á¦ÇÑµÈ ¿¬±¸ÀÇ °á°ú¸¦ ±Ù°Å·Î ´ÜÀÏü·Î »ç¿ëµÇ´Â °í¹ÝÅõ¸í Áö¸£ÄڴϾƿ¡ »öÁ¶¸¦ °¡¹ÌÇÏ´Â °ÍÀÌ ±ÁÈû°­µµ¿Í ½Å ·Úµµ¸¦ ÀúÇϽÃų ¼ö ÀÖÀ¸¸ç, µµÀç ÆÄÀýÀ» ¹æÁöÇÏ°í ½É¹Ì ÁõÁøÀ» À§ÇØ °í¹ÝÅõ¸í Áö¸£ÄڴϾƸ¦ »ç¿ëÇÒ °æ¿ì »öÁ¶ ¼±Åÿ¡ ÁÖ ÀǸ¦ ±â¿ï¿©¾ß ÇÒ °ÍÀÌ´Ù.

Purpose: The purpose of this study was to evaluate the flexural strength and reliability of highly translucent colored zirconia for all ceramic restoration.

Materials and Methods: Bar-shaped specimens (25 ¡¿ 4 ¡¿ 2.5 mm) were prepared from highly translucent monolithic zirconia. Three experimental groups were set up according to color (shade A0, A1, and A3). For each group, 20 specimens were prepared. Flexural strength was determined using a 3-point flexural test and results were analyzed with one-way ANOVA test. Weibull statistical analysis provided 2 parameter estimates: Weibull modulus and characteristic strength. X-ray diffraction (XRD) analysis was performed.

Results: There was statistically significant difference between uncolored (Shade A0) and colored (shade A1 and A3) (P < 0.05), but there was no difference between colored groups (P > 0.05). The uncolored group had higher reliability compared with colored study groups. On x-ray diffraction analysis of each group, typical peaks of tetragonal phase appeared in all groups.

Conclusion: Within the limitations of this in vitro study, coloring highly translucent zirconia had significant effect on flexural strength and reliability. Therefore, clinicians should be careful when using highly translucent colored zirconia to prevent breakage of veneering ceramic and enhance aesthetics

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Áö¸£ÄڴϾÆ; ¹ÝÅõ¸íµµ; »öÁ¶; ±ÁÈû°­µµ
zirconia; translucency; color; flexural strength

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