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Comparative study of fracture strength depending on the occlusal thickness of full zirconia crown

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Àå¼ö¾Æ ( Jang Soo-Ah ) - ÇѾç´ëÇб³ ÀÇ°ú´ëÇÐ Ä¡°úÇб³½Ç
±èÀ±¿µ ( Kim Yoon-Young ) - ÇѾç´ëÇб³ ÀÇ°ú´ëÇÐ Ä¡°úÇб³½Ç
¹Ú¿øÈñ ( Park Won-Hee ) - ÇѾç´ëÇб³ ÀÇ°ú´ëÇÐ Ä¡°úÇб³½Ç
ÀÌ¿µ¼ö ( Lee Young-Soo ) - ÇѾç´ëÇб³ ÀÇ°ú´ëÇÐ Ä¡°úÇб³½Ç

Abstract

¿¬±¸ ¸ñÀû: º» ¿¬±¸ÀÇ ¸ñÀûÀº ÀüÅëÀûÀÎ ±Ý¼ÓµµÀç°ü°ú ¿ÏÀü Áö¸£ÄÚ´Ï¾Æ Å©¶ó¿îÀÇ ±³ÇÕ¸é µÎ²²¿¡ µû¸¥ ÆÄÀý°­µµ¸¦ ºñ±³ÇÏ´Â °ÍÀÌ´Ù.

¿¬±¸ Àç·á ¹× ¹æ¹ý:ÇÏ¾Ç Á¦1´ë±¸Ä¡¿¡ ÇØ´çÇÏ´Â ·¹ÁøÄ¡¸¦ ±³ÇÕ¸é 1.5 mm, º¯¿¬Àº 1.0 mm ÆøÀÇ rounded shoulder·Î ÇÏ°í Ãà¸é °æ»ç°¢ÀÌ 6µµ°¡ µÇµµ·Ï »èÁ¦ÇÏ¿© ±Ý¼Ó ´ÙÀÌ 64°³¸¦ Á¦ÀÛÇÏ¿´´Ù. ¿ÏÀü Áö¸£ÄÚ´Ï¾Æ Å©¶ó¿îÀº ZIRKONZAHN CAD/CAMÀ» ÀÌ¿ëÇÏ¿© Prettau zirconia blanks¸¦ Àý»èÇÏ¿© 48°³ÀÇ Å©¶ó¿îÀ» Á¦ÀÛÇÏ°í ±³ÇÕ¸é ±³µÎÁ¤ÀÇ µÎ²²¿¡ µû¶ó 6°³±ºÀ¸·Î ºÐ·ùÇÏ¿´´Ù(0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm). 16°³ÀÇ ±Ý¼ÓµµÀç°üÀ» Á¦ÀÛÇÏ¿© ±³ÇÕ¸é ±³µÎÁ¤ µµÀçÀÇ µÎ²²¿¡ µû¶ó 2°³ ±ºÀ¸·Î ºÐ·ùÇÏ¿´´Ù(1.0 mm, 1.5 mm). ¿Ï¼ºµÈ ¿ÏÀü Áö¸£ÄÚ´Ï¾Æ Å©¶ó¿î°ú ±Ý¼ÓµµÀç°üÀº ¸¸´É½ÃÇè±â »ó¿¡¼­ Ä¡¾Æ ±³Çո鿡 ¼öÁ÷À¸·Î ÇÏÁßÀÌ °¡Çϵµ·Ï ÇÏ¿© ÆÄÀý°­µµ¸¦ ÃøÁ¤ÇÏ¿´´Ù. One-way ANOVA, Tukey multiple comparison test (¥á=.05)¿Í t-test (¥á=.05)·Î °ËÁ¤ÇÏ¿´´Ù.

°á°ú: º» ¿¬±¸ÀÇ °á°ú´Â ´ÙÀ½°ú °°´Ù. 1. ½ÇÇè 1±ºÀº °¡Àå ³·Àº °ª(646.48 N)À» ³ªÅ¸³»¾ú°í(P<.05), ½ÇÇè 2, 3, 4, 5±ºÀº ±³ÇÕ¸éÀÇ µÎ²²°¡ Áõ°¡ÇÒ¼ö·Ï ÆÄÀý°­µµ´Â Áõ°¡ÇÏ¿´Áö¸¸ (866.40 N, 978.82 N, 1196.82 N, 1222.41 N) Åë°èÀûÀ¸·Î À¯ÀÇÇÑ Â÷À̸¦ ³ªÅ¸³»Áö ¾Ê¾Ò´Ù(P>.05). ½ÇÇè 6±ºÀº ´Ù¸¥ ±ºº¸´Ù Åë°èÀûÀ¸·Î À¯ÀÇÇÏ°Ô °¡Àå ³ôÀº °ª(1781.24 N)À» ³ªÅ¸³»¾ú´Ù(P<.05). 2. ´ëÁ¶±ºÀÇ ÆÄÀý°­µµ´Â µµÀçÀÇ µÎ²²°¡ 1.0 mm¿Í 1.5 mmÀ϶§°¢°¢2515.71 N, 3473.31 NÀ̸ç ÀÌ´Â Åë°èÀûÀ¸·Î À¯ÀÇÇÑ Â÷À̸¦ ³ªÅ¸³»Áö ¾Ê¾Ò´Ù(P>.05).

°á·Ð: ¿ÏÀü Áö¸£ÄÚ´Ï¾Æ Å©¶ó¿îÀº ´ë±¸Ä¡ºÎ¿¡¼­ ÃÖ´ë±³Çշº¸´Ù ³ôÀº ÆÄÀý°­µµ¸¦ °®±â À§Çؼ­´Â 1.0 mmÀÌ»óÀÇ µÎ²²°¡ ÇÊ¿äÇÏ´Ù.

PURPOSE: The purpose of this study was to compare the fracture strength of traditional metal-ceramic crowns and full zirconia crowns according to the occlusal thickness.

MATERIALS AND METHODS: A mandibular first molar resin tooth was prepared with 1.5 mm occlusal reduction, 1.0 mm rounded shoulder margin and 6 degree taperness in the axial wall. Duplicating the resin tooth, 64 metal dies were fabricated. 48 full zirconia crowns were fabricated using Prettau zirconia blanks by ZIRKONZAHN CAD/CAM and classified into six groups according to the occlusal thickness (0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm). 16 metal-ceramic crowns were fabricated and classified into two groups according to the occlusal porcelain thickness (1.0 mm, 1.5 mm). All crowns were cemented on each metal die and mounted in a universal testing machine. The load was directed at the functional cusp of each specimen until catastrophic failure occurred. One-way ANOVA, Tukey multiple comparison test (¥á=.05) and t-test (¥á=.05) were used.

RESULTS: The results were as follows. 1. The test 1 group (646.48 N) showed the lowest fracture strength (P<.05), and the value of the test 2.3.4.5 groups (866.40 N, 978.82 N, 1196.82 N, 1222.41 N) increased as thickness increased, but no significant difference were found with the groups (P>.05). The value of test 6 group (1781.24 N) was significantly higher than those of the other groups (P<.05). 2. There were no significant differences of the fracture strength of metal ceramic crowns according to occlusal porcelain thickness 1.0 mm (2515.71 N) and 1.5 mm (3473.31 N) (P<.05).

CONCLUSION: Full zirconia crown needs to be 1.0 mm or over in occlusal thickness for the posterior area to have higher fracture strength than maximum bite force.

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¿ÏÀü Áö¸£ÄÚ´Ï¾Æ Å©¶ó¿î; ÆÄÀý°­µµ
Full zirconia crown; Fracture strength

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