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Effect of machining precision of single ceramic restorations on the marginal and internal fit

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¼ÕÅ«¹Ù´Ù, À¯¹ü¿µ, À̱Ժ¹,
¼Ò¼Ó »ó¼¼Á¤º¸
¼ÕÅ«¹Ù´Ù ( Son Keunbada ) - Kyungpook National University Graduate School Department of Dental Science
À¯¹ü¿µ ( Yu Beom-Young ) - Kyungpook National University Graduate School Department of Dental Science
À̱Ժ¹ ( Lee Kyu-Bok ) - Kyungpook National University School of Dentistry Department of Prosthodontics

Abstract

¸ñÀû: º» ¿¬±¸ÀÇ ¸ñÀûÀº 3 Á¾·ùÀÇ Ä¡°ú¿ë µµÀç ºí·ÏÀ¸·Î Á¦ÀÛµÈ ´ÜÀÏ ¼öº¹¹°ÀÇ °¡°ø Á¤¹Ðµµ¿Í º¯¿¬ ¹× ³»¸é ÀûÇÕµµ¸¦ Æò°¡ÇÏ°í, »ó°ü°ü°è¸¦ ºÐ¼®ÇÏ´Â °ÍÀÌ´Ù.

Àç·á ¹× ¹æ¹ý: 3 Á¾·ùÀÇ Ä¡°ú¿ë µµÀç ºí·Ï(Rosetta; HASS, IPS e.max CAD; Ivoclar vivadent, VITA Suprinity; VITA)À¸·Î Á¦ÀÛµÈ ´ÜÀÏ ¼öº¹¹°ÀÇ °¡°ø Á¤¹Ðµµ¿Í º¯¿¬ ¹× ³»¸é ÀûÇÕµµ¸¦ Æò°¡ÇÏ¿´´Ù. ijµå ¼ÒÇÁÆ®¿þ¾î¿¡¼­ ´ÜÀÏ ¼öº¹¹°À» µðÀÚÀÎÇÏ¿´°í, ¼öº¹¹° µðÀÚÀÎ ¸ðµ¨(crown designed model) ÆÄÀÏÀÇ Á¦ÀÛÀ» À§ÇØ µðÀÚÀÎ ÈÄ Ä³µå ¼ÒÇÁÆ®¿þ¾î¿¡¼­ ÃßÃâÇÏ¿´´Ù. ±×¸®°í ¼öº¹¹° µðÀÚÀÎ ¸ðµ¨ ÆÄÀÏÀº ¹Ð¸µ Àåºñ¸¦ »ç¿ëÇÏ¿© µµÀç ºí·Ï(lithium disilicate ceramic block)À» °¡°øÇÏ¿´´Ù. ¼öº¹¹° ½ºÄµ ¸ðµ¨(crown scanned model) ÆÄÀÏÀÇ Á¦ÀÛÀ» À§Çؼ­ Á¢ÃË½Ä ½ºÄ³³Ê¸¦ ÀÌ¿ëÇÏ¿© Á¦ÀÛµÈ ¼öº¹¹°ÀÇ ³»¸éÀ» µðÁöÅÐÈ­ ÇÏ¿´´Ù. ±×¸®°í »ïÂ÷¿ø °Ë»ç ¼ÒÇÁÆ®¿þ¾î(Geomagic control X; 3D Systems)¸¦ ÀÌ¿ëÇÏ¿©, ¼öº¹¹° µðÀÚÀÎ ¸ðµ¨°ú ½ºÄµ ¸ðµ¨ÀÇ Áßø°ú °¡°ø Á¤¹ÐµµÀÇ »ïÂ÷¿ø ºÐ¼®ÀÇ ´Ü°è·Î ÁøÇàµÇ¾ú´Ù. ±×¸®°í Á¦ÀÛµÈ ¼öº¹¹°ÀÇ º¯¿¬ ¹× ³»¸é ÀûÇÕµµ´Â ½Ç¸®ÄÜ º¹Á¦ ¹æ¹ýÀ¸·Î Æò°¡µÇ¾ú´Ù. 3 Á¾·ùÀÇ ´ÜÀÏ µµÀç ¼öº¹¹°ÀÇ Â÷ÀÌ´Â Kruskal-Wallis H test¸¦ ÅëÇØ ºÐ¼®µÇ¾ú°í, °¡°ø Á¤¹Ðµµ¿Í º¯¿¬ ¹× ³»¸é ÀûÇÕµµÀÇ »ó°ü°ü°è¸¦ ºÐ¼®Çϱâ À§Çؼ­ Spearman correlation analysisÀ» ÇÏ¿´´Ù (¥á = .05).

°á°ú: µµÀç ºí·ÏÀÇ Á¾·ù¿¡ µû¶ó¼­ °¡°ø Á¤¹Ðµµ¿Í º¯¿¬ ¹× ³»¸é ÀûÇÕµµ´Â À¯ÀǹÌÇÑ Â÷ÀÌ°¡ ÀÖ¾ú´Ù (P < .001). ±×¸®°í °¡°ø Á¤¹Ðµµ¿Í º¯¿¬ ¹× ³»¸é ÀûÇÕµµ´Â ¼­·Î ¾çÀÇ »ó°ü°ü°è¸¦ º¸¿´´Ù (P < .001).

°á·Ð: µµÀç ºí·ÏÀÇ Á¾·ù¿¡ µû¶ó¼­ Á¦ÀÛµÈ ´ÜÀÏ ¼öº¹¹°ÀÇ º¯¿¬ ÀûÇÕµµ´Â ÀÓ»óÀû Çã¿ë ¹üÀ§¿¡ ÀÖ¾ú±â ¶§¹®¿¡(< 120 ¥ìm), ÀûÇÕµµ Ãø¸é¿¡¼­ ¸ðµÎ ÀÓ»ó¿¡ Àû¿ëÇÒ ¼ö ÀÖ´Â ÀûÀýÇÑ °¡°ø Á¤¹Ðµµ·Î °£ÁÖÇÒ ¼ö ÀÖ´Ù.

Purpose: The purpose of this study was to evaluate the machining precision and the marginal and internal fit of single restorations fabricated with three types of lithium disilicate ceramic blocks and to evaluate the correlation.

Materials and methods: Single restorations were designed using a CAD software program. The crown designed model file was extracted from the CAD software program. Three types of lithium disilicate blocks (Rosetta; HASS, IPS e.max CAD; Ivoclar vivadent, VITA Suprinity; VITA) were milled using a milling machine. For the fabrication of the crown scanned model file, the intaglio surface of the restoration was digitized using a contact scanner. Then, using the three-dimensional inspection software (Geomagic control X; 3D Systems), the process of the overlap of the crown designed model and the scanned model and 3-dimensional analysis was conducted. In addition, the marginal and internal fit of the crowns was evaluated by a silicone replication method. The difference among three types of single ceramic crown was analyzed using a Kruskal-Wallis H test, and Spearman correlation analysis was performed to analyze the correlation between machining precision and fitness (¥á=.05)

Results: There was a significant difference in the machining precision and the marginal and internal fit according to the type of ceramic block (P<.001). In addition, the machining precision and the marginal and internal fit were positively correlated (P<.001).

Conclusion: The marginal fit of crowns fabricated according to the types of ceramic blocks was within the clinically acceptable range (< 120 ¥ìm), so it can be regarded as appropriate machining precision applicable to all clinical as aspects in terms of the marginal fit.

Å°¿öµå

µµÀç; °¡°ø Á¤¹Ðµµ; º¯¿¬ ¹× ³»¸é ÀûÇÕµµ; ´ÜÀÏ ¼öº¹¹°
Ceramic; Machining precision; Marginal and internal fit; Single restoration

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