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Effect of investment materials on 3-point flexural strength of heat pressed zirconia core

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±èÅ¿¬ ( Kim Tae-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
ÀÓº´±¸ ( Lim Byoung-Gu ) - Chonbuk National University School of Dentistry Department of Orthodontics
¿À¼º±Ù ( Oh Sung-Geun ) - Suncheon Jeil College Department of Health and Medical Administration
½ÅÀç¿ì ( Shin Jae-Woo ) - Chonbuk National University School of Dentistry Department of Dental Biomaterials
ÀÌÁ¤È¯ ( Lee Jung-Hwan ) - Gwangju Health University Department of Dental Laboratory Technology
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 ¿­°¡¾Ð¼ºÇü¹ýÀ» Àû¿ëÇÏ´Â °úÁ¤¿¡¼­ ÀϾ´Â Áö¸£ÄÚ´Ï¾Æ¿Í ¸Å¸ôÀç »çÀÌÀÇ ¹ÝÀÀÀÌ Áö¸£ÄڴϾư­µµ¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» Æò°¡ÇÏ´Â °ÍÀÌ´Ù. Zirtooth¢â Multi O-9814 ºí·Ï (?98 ¡¿ 14T, HASS, Gangwondo, Korea)À»24 mm¡¿4 mm¡¿0.5 mm·Î Àý»è °¡°øÇÏ¿© ÃÑ 60°³ÀÇ ½ÃÆíÀ» ¸¸µç ´ÙÀ½ 1450¡É ¿¡¼­ ¼Ò°áÇß´Ù. ½ÃÆíÀº ¸Å¸ôÀç¿¡µû¶ó 6°³ÀÇ ÇÏÀ§ ±×·ìÀ¸·Î ³ª´©¾ú´Ù. (a) UN ±×·ì (´ëÁ¶±º), (b) PH ±×·ì (Prime vest HS), (c) CP ±×·ì (Calibra-press), (d) BV ±×·ì (BC-Vest), (e) MH ±×·ì (Microstar- HS), (f) F1 ±×·ì (Fomula 1). 5°¡Áö ¸Å¸ôÀ縦 »ç¿ëÇÏ¿© Á¦Á¶»ç°¡±ÇÀåÇÏ´Â ÀýÂ÷¿¡ µû¶ó ¸Å¸ôÇÑ ´ÙÀ½ »ó¿Â¿¡¼­ 30ºÐ°£ ¹æÄ¡Çß´Ù. ¸Å¸ôÀç ÁÖÇüÀ» °ÇÁ¶ÇÏ°í ¼Òȯ¿Âµµ 850¡É ¿¡¼­ 50ºÐ°£°è·ù½ÃÄ×´Ù. ±×¸®°í Amber Lisi-POZ LT (HASS)¸¦ ÁÖÇü°ú ÇÔ²² ¿­°¡¾Ð¼ºÇü Àü±â·Î(Programat EP3000/G2, Ivoclar Vivadent, Schaan, Liechtenstein)¿¡ ³Ö°í »ó½Â¿Âµµ 45¡É/min À¸·Î 915¡É ±îÁö °¡¿­ÇÑ ´ÙÀ½ 15ºÐ µ¿¾È °è·ù½ÃÄ×´Ù.
½ÃÆíÀº Àç·á½ÃÇè±â(universal testing machine 4201, instron, Canton, MA, USA)¿¡ ÁغñµÈ ½ÃÆíÀ» ¿Ã·Á³õ°í crosshead speed 0.5mm/min ¿¡¼­ ÆÄÀý ÇÏÁßÀ» ÃøÁ¤Çß´Ù. ÆÄÀý¸éÀº Àü°è ¹æÃâ ÁÖ»ç ÀüÀÚ Çö¹Ì°æ(FE-SEM)À¸·Î °üÂûÇß´Ù. ¸Å¸ôÀç¿ÍÁ¢ÃËµÈ Áö¸£ÄÚ´Ï¾Æ ½ÃÆíÀÇ Ç¥¸é¿¡ Á¸ÀçÇÏ´Â ¿ø¼ÒÀÇ º¯È­¸¦ X-¼± ½ºÆåÆ®·³(EDS, Bruker, Germany)·Î ºÐ¼®Çß´Ù. 3Á¡±¼°î °­µµ ½ÃÇèÀº UN ±º¿¡¼­ °¡Àå ³ôÀº °ª (1265.5 MPa), F1 ±º¿¡¼­ °¡Àå ³·Àº °ª (756.1 MPa)À» ³ªÅ¸³Â´Ù. EDS ºÐ¼® °á°ú F1 ±×·ì¿¡¼­ °¡Àå ¸¹Àº Si°¡ °ËÃâµÇ¾úÀ¸¸ç FE-SEM ºÐ¼® °á°ú °¡Àå ¸¹Àº °è¸é º¯È­°¡ ¹ß»ýÇß´Ù. Áö¸£ÄڴϾƴ¸ŸôÀç·Î ¸Å¸ôÇÑ ÈÄ ¿­°¡¾Ð¼ºÇüÀ» ½Ç½ÃÇÒ °æ¿ì °áÇÕ °è¸é ºÎ±ÙÀÇ Áö¸£ÄڴϾÆÀÇ »óź¯È­·Î ÀÎÇØ °­µµ°¡ ÀúÇϵȴÙ.

The purpose of this study was to evaluate the effect of the reaction between investment material and zirconia on the strength of zirconia in the application of heat-pressing method. Sixty specimens were cut (24 mm¡¿4 mm¡¿0.5 mm) into plates from Zirtooth¢â Multi O-9814 block (?98¡¿14T, HASS, Gangwondo, Korea) and sintered at 1450¡É. Specimens were divided into 6 subgroups according to the depending on the investement material; (a) UN group (Control), (b) PH group (Prime vest HS), (c) CP group (Calibra-press), (d) BV group (BC-Vest), (e) MH group (Microstar-HS), (f) F1 group (Formula 1). Five investment materials were buried according to the procedure recommended by the manufacturer and left at room temperature for 30 minutes.
The investment mold was dried and maintained at an elevated temperature of 850¡É for 50 minutes. Then, Amber Lisi-POZ LT (HASS) was placed in a thermoformed electric furnace (Programat EP3000/G2, Ivoclar Vivadent, Schaan, Liechtenstein) together with the mold, heated to 915¡É at an elevation temperature of 45¡É/min, and moored for 15 minutes. The specimens were loaded to fracture in a universal testing machine and the fracture surface was examined by a field-emission scanning electron microscopy (FE-SEM). The surface of the zirconia specimen with the investment material was analyzed by energy dispersive X-ray spectroscopy (EDS). The 3-point flexural strength test showed the highest value (1265.5 MPa) in the UN group and the lowest value (756.1 MPa) in the F1 group. As a result of EDS analysis, the largest amount of Si was detected in the F1 group, and the most interfacial changes occurred as a result of FE-SEM analysis. It was concluded that when the zirconia is buried with the investment material and the heat press molding is performed, the state of the interface is changed due to the investment material at the bonding interface while the strength is lowered.

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Zirconia; Investment material; 3-point flexural strength; Heat-pressing method

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