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Axial wall thickness of zirconia abutment in anterior region

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¹®½ÂÁø ( Moon Seung-Jin ) - Á¶¼±´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø
ÇãÀ¯¸® ( Heo Yu-Ri ) - Á¶¼±´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Ã¶Çб³½Ç
ÀÌ°æÁ¦ ( Lee Gyeong-Je ) - Á¶¼±´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Ã¶Çб³½Ç
±èÈñÁß ( Kim Hee-Jung ) - Á¶¼±´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Ã¶Çб³½Ç

Abstract

¸ñÀû: ÀÌ ½ÇÇèÀÇ ¸ñÀûÀº ÀüÄ¡ºÎ ÀÓÇöõÆ®¿¡ Àû¿ëµÇ´Â Áö¸£ÄÚ´Ï¾Æ Áö´ëÁÖÀÇ ÀûÀýÇÑ ÃຮÀÇ µÎ²²¸¦ Æò°¡ÇÏ´Â °ÍÀ̾ú´Ù.

Àç·á ¹× ¹æ¹ý: ½ÃÆíµéÀº 4°¡ÁöÀÇ ¼­·Î ´Ù¸¥ µÎ²²·Î Á¦À۵ǾúÀ¸¸ç, ÀÏÁ¤ÇÏ°Ô Á¦ÀÛÇÏ°íÀÚ CAD/CAM ½Ã½ºÅÛÀ» ÀÌ¿ëÇÏ¿© ¼Ò°áÀü Áö¸£ÄÚ´Ï¾Æ ºí·ÏÀ» °¡°øÇÑ ÈÄ ¼Ò°áÇÏ¿´´Ù. °¡°øµÈ ½ÃÆíµéÀº µÎ²²¿¡ µû¶ó Group 1 (0.5 mm), Group 2 (0.8 mm), Group 3 (1.0 mm), Group 4 (1.2 mm)ÀÇ 4°¡Áö ±×·ìÀ¸·Î ºÐ·ùµÇ¾ú´Ù. ÀÓÇöõÆ® ½Ã½ºÅÛÀº ¿ÜºÎ¿¬°áÇü(US, Osstem, Pussan, Korea) À» ÀÌ¿ëÇÏ¿´´Ù. Áö´ëÁÖ ½ÃÆíµéÀº ½Ã¸àÆ® À¯ÁöÇü Áö´ëÁÖ¸¦ º¹Á¦ÇÏ¿© Á¦À۵Ǿú´Ù. Å©¶ó¿îÀº 1.5 mm ÀÇ µÎ²²·Î CAD/CAMÀ» ÀÌ¿ëÇÏ¿© Á¦À۵Ǿú´Ù. Á¦ÀÛµÈ Áö´ëÁÖ ½ÃÆíµéÀ» ÀÓÇöõÆ®¿¡ °íÁ¤½ÃŲ ÈÄ ·¹Áø½Ã¸àÆ®(RelyX(TM) UniCem, 3M ESPE AG, Seefeld, Germany)¸¦ ÀÌ¿ëÇÏ¿© Å©¶ó¿îÀ» ÇÕÂøÇÏ¿´´Ù. Áö¸£ÄÚ´Ï¾Æ Áö´ëÁÖÀÇ ÆÄÀýÀ» ÃøÁ¤Çϱâ À§ÇØ ¸¸´É½ÃÇè±â·Î ÀÓÇöõÆ® ÀåÃà¿¡ 30µµÀÇ °¢µµ·Î ÈûÀ» °¡ÇÏ¿´´Ù.

°á°ú: Group 1, Group 2, Group 3¿Í Group 4ÀÇ ÆÄÀý°­µµ´Â °¢°¢ 236.00 ¡¾ 67.55 N, 599.00 ¡¾ 15.80 N, 588.20 ¡¾ 33.18 N, 97.83 ¡¾ 98.13 NÀ̾ú´Ù. Group 1ÀÌ ´Ù¸¥ ±×·ì¿¡ ºñÇØ Åë°èÇÐÀûÀ¸·Î À¯ÀǼº ÀÖ°Ô ³·Àº °­µµ¸¦ º¸¿©ÁÖ¾ú´Ù(independent Mann-Whitney U-test, P<.05). ³ª¸ÓÁö Group 2, Group 3¿Í Group 4´Â ¼­·Î Åë°èÇÐÀûÀ¸·Î À¯ÀǼºÀ» º¸¿©ÁÖÁö ¾Ê¾Ò´Ù(independent Mann-Whitney U-test, P>.05).

°á·Ð: Áö¸£ÄÚ´Ï¾Æ Áö´ëÁÖ´Â ÆÄÀý¿¡ ÀúÇ×Çϱâ À§ÇØ ÀûÀýÇÑ µÎ²²¸¦ ÇÊ¿ä·Î ÇÑ´Ù. ÀÌ ½ÇÇèÀÇ °á°ú·Î ÆÇ´ÜÇÒ ¶§, Áö¸£ÄÚ´Ï¾Æ Áö´ëÁÖ°¡ ÀüÄ¡ºÎ ÀÓÇöõÆ®¿¡ Àû¿ëµÇ±â À§Çؼ­´Â 0.8 mm ÀÌ»óÀÇ µÎ²²¸¦ °¡Á®¾ß µÈ´Ù°í ÃßõµÈ´Ù.

Purpose: The purpose of this study was to evaluate the proper axial thickness of zirconia abutment applied to implant in the anterior region.

Materials and methods: Zirconia abutments were prepared at different axial wall thickness by processing pre-sintered zirconia blocks via CAD/CAM to obtain equal specimens. The abutments were each produced with a thickness of 0.5 mm (Group 1), 0.8 mm (Group 2), 1.2 mm (Group 3), or 1.5 mm (Group 4). The implant used in this study was a external connection type one (US, Osstem, Pussan, Korea) product and the zirconia abutment was prepared via replication of a cemented abutment. The crowns were prepared via CAM/CAM with a thickness of 1.5 mm and were cemented to the abutments using RelyXTM UniCem cement. A universal testing machine was used to apply load at 30 degrees and measure fracture strength of the zirconia abutment.

Results: Fracture strength of the abutments for Group 1, Group 2, Group 3, and Group 4 were 236.00 ¡¾ 67.55 N, 599.00 ¡¾ 15.80 N, 588.20 ¡¾ 33.18 N, and 97.83 ¡¾ 98.13 N, respectively. Group 1 showed a significantly lower value, as compared to the other groups (independent Mann-Whitney U-test. P<.05). No significant differences were detected among Group 2, Group 3, and Group 4 (independent Mann-Whitney U-test. P>.05).

Conclusion: Zirconia abutment requires optimal thickness for fracture resistance. Within the limitation of this study, > 0.8 mm thickness is recommended for zirconia abutment in anterior implants.

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Zirconia abutment; Fracture strength; Axial wall thickness

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