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Comparison of occusal aspects in monolithic zirconia crown before and after occlusal adjustment during intraoral try-in: a case report

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¿ë±âÈÆ, ½ÉÁؼº,
¼Ò¼Ó »ó¼¼Á¤º¸
¿ë±âÈÆ ( Yong Ki-Hoon ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Ã¶Çб³½Ç
½ÉÁؼº ( Shim June-Sung ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Ã¶Çб³½Ç

Abstract

CAD/CAMÀ» ÀÌ¿ëÇÏ¿© º¸Ã¶¹°À» Á¦ÀÛÇÒ °æ¿ì ±³ÇÕ Á¢ÃËÁ¡ÀÇ À§Ä¡, ¸éÀû, ÇüŸ¦ ¿øÇÏ´Â ´ë·Î Á¶ÀýÇÒ ¼ö ÀÖÀ¸¹Ç·Î º¸´Ù ±â´ÉÀûÀÎ ±³ÇÕÀÇ ºÎ¿©°¡ °¡´ÉÇÏ´Ù. ¶ÇÇÑ ÀüÅëÀûÀÎ Casting ±â¹ýÀ» ÀÌ¿ëÇÑ ÁÖÁ¶±Ý¼Ó º¸Ã¶¹°À̳ª, PorcelainÀÇ Ã༺À» ÅëÇØ Á¦ÀÛµÈ º¸Ã¶¹°¿¡ ºñÇÏ¿© Á¦ÀÛ°úÁ¤ ÁßÀÇ ¿ÀÂ÷°¡ °¨¼ÒÇÏ¿© ¿ì¼öÇÑ ±³ÇÕ Á¤È®µµ¸¦ ¾òÀ» ¼ö ÀÖÀ» °ÍÀ¸·Î ±â´ëµÇ°í ÀÖ´Ù. ±×¸®°í ÃÖ±Ù ¼Ò°³µÇ°í ÀÖ´Â CAD/CAM system¿¡´Â °¡»ó ±³Çձ⠱â´ÉÀÌ Ãß°¡µÇ¾î ´ÜÀÏ ¼öº¹¹°ÀÇ ¼³°è¿¡¼­µµ »ó¾Ç¿¡ ´ëÇÑ ÇϾÇÀÇ ¿îµ¿À» ÀçÇöÇÔÀ¸·Î½á Æó±¸ ¿îµ¿ »Ó¸¸ ¾Æ´Ï¶ó Àü/Ãø¹æ ¿îµ¿½ÃÀÇ ±³ÇÕ°£¼·À» °í·ÁÇÒ ¼ö ÀÖ°Ô µÇ¾ú´Ù. ±× µ¿¾È zirconia¸¦ ÀÌ¿ëÇÑ º¸Ã¶¹°ÀÇ º¯¿¬ ¹× ³»¸é ÀûÇÕµµ¿¡ ´ëÇÑ ¿¬±¸´Â ¸¹ÀÌ ÀÌ·ç¾îÁ³À¸³ª CAD/CAMÀ» ÀÌ¿ëÇØ ¼³°èµÈ zirconia crownÀÇ ±³ÇÕ ÀûÇÕµµ¿¡ ´ëÇÑ ¿¬±¸´Â ¸¹ÀÌ ÀÌ·ç¾îÁöÁö ¾Ê¾Ò´Ù. µû¶ó¼­ º» Áõ·Ê¿¡¼­´Â ÃÑ 5¸íÀÇ È¯ÀÚ¿¡¼­ CAD/CAMÀ» ÀÌ¿ëÇÏ¿© Á¦ÀÛµÈ 7°³ÀÇ Áö¸£ÄÚ´Ï¾Æ Å©¶ó¿îÀ» ´ë»óÀ¸·Î, óÀ½ ¼³°èµÈ zirconia crownÀÇ ±³ÇÕ Á¢ÃËÁ¡°ú Á¶Á¤°úÁ¤À» °ÅÃÄ ±¸°­ ³» ½ÃÀû ÈÄ¿¡ Á¦ÀÛµÈ ¸ðµ¨À» ½ºÄµÇÏ¿© ȹµæµÈ ±³ÇÕ Á¢ÃËÁ¡À» ºñ±³ÇÏ¿© º¸Ã¶¹°ÀÇ Á¤È®µµ¸¦ Æò°¡ÇÏ°í ±³ÇÕÁ¶Á¤ÀÇ ¾ç»óÀ» ÆľÇÇØ º¸°íÀÚ ÇÏ¿´´Ù. Áö¸£ÄÚ´Ï¾Æ Å©¶ó¿î¿¡¼­ ÀÌ·ç¾îÁø ±³ÇÕÁ¶Á¤Àº ´ëºÎºÐ ±â´É±³µÎ ¹× »ç¸éºÎÀ§¿¡¼­ ÀÌ·ç¾îÁ³À¸¸ç 15 - 60 §­ÀÇ ºÐÆ÷¸¦ º¸¿´´Ù. CAD/CAMÀ» ÀÌ¿ëÇÏ¿© Á¦ÀÛµÈ Áö¸£ÄÚ´Ï¾Æ Å©¶ó¿î¿¡¼­ ¾î´ÀÁ¤µµÀÇ ±³ÇÕÁ¶Á¤Àº ºÒ°¡ÇÇÇÑ °úÁ¤À̸ç ÀÌ¿¡ µû¸¥ ¹°¼ºÀúÇϸ¦ º¸»óÇϱâ À§ÇÑ Ãß°¡ÀûÀÎ °úÁ¤ÀÌ ÇÊ¿äÇÒ °ÍÀÌ´Ù.

In case of prosthesis fabrication by CAD/CAM, location, area and contour of occlusal contacts can be adjusted so more functional occlusion can be acquired. Also, errors in a manufacturing process is reduced compared to cast metal prostheses and porcelain fused metal prostheses fabricated by conventional methods such as casting and porcelain build up. Therefore, prostheses by CAD/CAM show superior occlusion accuracy. Recently, virtual articulator function has been introduced to CAD/CAM system, which reproduces mandibular movement against maxilla. Thus, it is possible to consider occlusal interference in anterior/lateral movement as well as closing movement. There have been many studies on the marginal and internal fit of prostheses using zirconia but the occlusal fit of zirconia crown fabricated by CAD/CAM has not been researched as much. In this case report, 7 zirconia crowns were designed and fabricated by CAD/CAM for total 5 patients. The models of zirconia crowns before and after occlusal adjustment during intraoral try-in were scanned for occlusal contacts, which were compared to evaluate accuracy of prostheses and understand patterns of occlusal adjustment. Most of the occlusal adjustments were done on functional cusps and slopes of zirconia crown, and the magnitude of occlusal adjustment ranged from 15 §­ to 60 §­. In the zirconia crown fabricated with CAD/CAM systems, the occlusal adjustment is a necessary procedure, so additional procedures will be needed for compensating reduced mechanical properties.

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CAD/CAM; Áö¸£ÄÚ´Ï¾Æ Å©¶ó¿î; ±³ÇÕÁ¶Á¤
CAD CAM; Zirconia crown; Occlusal adjustment

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