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A STUDY ON THE DEGREE OF POLYMERIZATION OF AUTOPOLYMERIZED RESIN FOR REMOVABLE ORTHODONTIC APPLIANCE ACCORDING TO CURING TIME AND CURING METHOD

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Abstract

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2. 10ºÐ°ú 1ÀÏ, 3ÀÏ °æ°ú ÈÄ¿¡ Á¦ 5±º, Á¦ 4±º, Á¦ 3±º, Á¦ 2±º, Á¦ 1±ºÀÇ ¼ø¼­´ë·ÎÁßÇÕ·üÀÌ ³ô¾Ò´Ù.
3. ÁßÇսà ¿Âµµ¿¡ µû¸¥ ºñ±³¿¡¼­, 1ÀÏ °æ°úÈĸ¦ Á¦¿ÜÇÏ°í´Â ¸ðµç ½Ã°£¿¡¼­ 43¡É¿¡¼­ ÁßÇÕ½ÃŲ ±ºÀÇ ÁßÇÕ·üÀÌ 28¡É¿¡¼­ ÁßÇÕ½ÃŲ ±ºÀÇ ÁßÇÕ·ü º¸´Ù À¯ÀǼº ÀÖ°Ô ³ô¾Ò´Ù(p<0.05).
4. ¾Ð·ÂÀº 12½Ã°£ °æ°ú Èĸ¦(p<0.05) Á¦¿ÜÇÏ°í´Â ÁßÇÕ·ü¿¡ ¿µÇâÀ» ÁÖÁö ¸øÇß´Ù.
5. º¸°ü¹æ¹ýÀº 1½Ã°£ °æ°ú Èĸ¦(p<0.05) Á¦¿ÜÇÏ°í´Â ÁßÇÕ·ü¿¡ ¿µÇâÀ» ÁÖÁö ¸øÇß´Ù.

Autopolymerized resin facilitates a more rapid and easier means for the construction of removable orthodontic appliances than heat cured resin. But many reports reveal that more unreacted monomer is found in autopolymerized resin. It is very important to achieve maximum degree of polymer¡©ization because if polymerization is inadequate, high level of unreacted monomer has been shown to adversely affect mechanical and physical properties, and also the question of allergy or toxi¡©city to methylmethacrylate must be considered. The purpose of this study was to compare the de¡©gree of polymerization according to curing method and curing time.
Five groups were desinged ; Group 1 was polymerizied at room temperature (281C) ; Group 2 in 281C water > Group 3 in 281C water under 30psi pressure ; Group 4 in 431C water ; Group 5 in 43¢¥e water under 30psi pressure for 10 minutes, 1 hour, 12 hours, 1 day and 3 days. The de¡©gree of polymerization was measured by means of Fourier Transform Infrared spectroscopy.
The results were as follows
L The degree of polymerization increased constantly in accordance with curing time in all groups and after curing for 10 minutes, Group 1 showed significantly higher degree of polymerization after 12 hours and Group 2, Group 3, Group 4, Group 5 after 1 hour(p(0.05).
2. The degree of polymerization decreased in the order of Group 5. Group 4. Group 3, Group 2, Group 1 except when the curing time was 1 hour and 12 hours(p<0..05).
3. The degree of polymerization of Group 4, Group 5 cured at 43¡ÆC showed significantly higher degree of polymerization than Group 2, Group 3 at 281C except when the curing time was 1 day(p(O.05).
4. Among Group 2, Group 3 and Group 4, Group 5, the pressure had no effect on polymerization except when the curing time was 12 hours(p(0.05).
5. Between Group 1 and Group 2, the method of storage had no effect on polymerization except when the curing time was 1 hour(p(0.05).

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ÁßÇÕ·ü;¹Ì¹ÝÀÀ ´Ü·®Ã¼;ÀÚ°¡ÁßÇÕÇü »ó±³Á¤¿ë ·¹Áø;Fourier º¯È¯Àû¿Ü¼±ºÐ±¤¹ý;autopolymerized resin;Fourier Transform Infrared spectroscopy;heat cured resin;polymerization;unreacted monomer

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