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Effect of fabrication method of lithium disilicate crown on fitness

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ÃÖ¼ö¿¬ ( Choi Su-Yeon ) - Chonbuk National University School of Dentistry Department of Dental Biomaterials
±è¼¼ÇÏ ( Kim Se-Ha ) - Chonbuk National University School of Dentistry Department of Dental Biomaterials
ÁöÁ¤Èñ ( Ji Jeong-Hui ) - Chonbuk National University School of Dentistry Department of Dental Biomaterials
À̹ÎÈ£ ( Lee Min-Ho ) - Chonbuk National University School of Dentistry Department of Dental Biomaterials
¹èżº ( Bae Tae-Sung ) - Chonbuk National University School of Dentistry Department of Dental Biomaterials

Abstract

º» ¿¬±¸ÀÇ ¸ñÀûÀº ¸®Æ¬ µð½Ç¸®ÄÉÀÌÆ® ±Û¶ó½º ¼¼¶ó¹Í ´Ü°üÀÇ Á¦Á¶ ¹æ¹ýÀÌ º¯¿¬ ¹× ³»¸é ÀûÇÕµµ¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» Æò°¡ÇÏ´Â °ÍÀÌ´Ù. ¸®Æ¬ µð½Ç¸®ÄÉÀÌÆ® ´Ü°üÀº Hass ¹× Ivoclar / Vivadent »ç¿¡¼­ Á¦Á¶µÈ ¿­°¡¾Ð ¼ºÇü¿ë À×°÷°ú CAD/CAM ¹Ð¸µ¿ë ºí·ÏÀ» »ç¿ëÇÏ¿© Á¦ÀÛÇÏ¿´´Ù. »ó¾Ç ÁßÀýÄ¡(#11)¸¦ Àý´Ü¿¬ 2 mm, Ãà¸é 1 mm·Î Àý»èÇÏ°í, Ãຮ °¢µµ´Â 6¡Æ , º¯¿¬ºÎ´Â deep chamfer ÇüÅ·ΠÇü¼ºÇÏ¿´´Ù. Á¦ÀÛ¹æ¹ý¿¡ µû¶ó 6°³ÀÇ ±×·ìÀ¸·Î ³ª´©¾ú´Ù. ECM (IPS e.max CAD), EPC (Conventional wax-up & IPS e.max press), EPM (Wax block milling & IPS e.max Press), ABM (Amber Mill), APC (Conventional wax-up & Amber Press), APM (Wax block milling & Amber Press). º¯¿¬ ¹× ³»¸é ÀûÇÕµµÀÇ ÃøÁ¤ ¹æ¹ýÀ¸·Î ½Ç¸®ÄÜ º¹Á¦¹ýÀ» ÀÌ¿ëÇÏ¿´°í, Çö¹Ì°æÀ» »ç¿ëÇÏ¿© ¹Ì¸® Á¤ÇسõÀº 14°³ÀÇ ±âÁØÁ¡¿¡¼­ ÃøÁ¤ÇÏ¿´´Ù. Åë°èºÐ¼®À» À§ÇØ Kruskal Wallis test¸¦ ½ÃÇàÇÏ¿´°í »çÈÄ°ËÁ¤À¸·Î Mann Whitey test¸¦ ½ÃÇàÇÏ¿´´Ù. Bonferroni's method·Î Á¦1Á¾ ¿À·ù¸¦ º¸Á¤ÇÏ¿´´Ù. º¯¿¬ ºÎÀ§¿¡¼­´Â ECM±×·ì°ú EPM±×·ì »çÀÌ¿¡¼­¸¸ À¯ÀÇÇÑ Â÷ÀÌ°¡ ÀÖ¾ú°í ¸ðµç ±×·ì¿¡¼­ ÀÓ»óÀûÀ¸·Î Çã¿ë°¡´ÉÇÑ ¹üÀ§(120 ¥ìm) À̳»ÀÇ º¯¿¬ÀûÇÕµµ¸¦ ³ªÅ¸³Â´Ù. Deep chamfer¿¡¼­´Â CAD/CAM ¹æ½ÄÀ¸·Î Á¦ÀÛÇÑ ECM°ú ABM±×·ì¿¡¼­ ÀûÇÕµµ°¡ °¡Àå ¿ì¼öÇÏ°Ô ³ªÅ¸³µ´Ù. Ãຮ°ú Àý´Ü¿¬¿¡¼­´Â ECM±×·ìÀÌ EPC¿Í EPM±×·ì¿¡ ºñÇØ ÀûÇÕµµ°¡ ¿ì¼öÇÏ°Ô ³ªÅ¸³µ°í, ABM±×·ì°ú APC±×·ìÀÌ APM±×·ì¿¡ ºñÇØ Åë°èÀûÀ¸·Î À¯ÀÇÇÏ°Ô ¿ì¼öÇÑ ÀûÇÕµµ¸¦ ³ªÅ¸³Â´Ù.

The purpose of this study was to evaluate the influence of fabrication methods of lithium disilicate reinforced glass-ceramic crown on marginal and internal fit. Lithium disilicate reinforced glass-ceramic crowns were fabricated using ingots for heat press forming and blocks for CAD/CAM milling manufactured by Hass and Ivoclar/Vivadent. Dentiform of maxillary central incisor was prepared with a 6¡Ætaper and 1 mm deep chamfer margin and duplicated with silicone. Then the polyurethane resin was poured at silicone mold to produce working model. Marginal and internal fit were measured by the silicone replica technique. Each silicon replica was cut into labio-lingual and mesio-distal sections and the thickness of the light body silicon was measured. Fourteen reference points were determined and measured using a microscope. As a result of calculating and comparing the average value of 14 points in all groups, the measured value was within 120 ¥ìm, the clinically acceptable range suggested by previous literatures. In all groups, the marginal fit was smaller than the internal fit. At the margin area, significant differences were identified only between the ECM group and the EPM group, and there was no statistically significant difference between the remaining groups. At the deep chamfer area, the ECM and ABM group produced by the CAD system had excellent compatibility. In the axial wall and incisal area, ECM was superior to both EPC and EPM. Also, both ABM and APC groups were statistically significantly superior than APM.

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¸®Æ¬ µð½Ç¸®ÄÉÀÌÆ®; º¯¿¬ÀûÇÕµµ; ³»¸éÀûÇÕµµ; ½Ç¸®ÄÜ º¹Á¦¹ý; º¹Á¦¹æ¹ý
Lithium disilicate; Fabrication methods; Marginal fit; Internal fit; Replica technique

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