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ANALYSES OF PORCELAIN SURFACE ROUGHNESS POLISHED BY VAR10US TECHNIQUE

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À̱Կµ ( Lee Kyu-Young ) - °æºÏ´ëÇб³ Ä¡°ú´ëÇÐ º¸Ã¶Çб³½Ç
ÀÌûÈñ ( Lee Cheong-Hee ) - °æºÏ´ëÇб³ Ä¡°ú´ëÇÐ º¸Ã¶Çб³½Ç
Á¶±¤Çå ( Jo Kwang-Hun ) - °æºÏ´ëÇб³ Ä¡°ú´ëÇÐ º¸Ã¶Çб³½Ç

Abstract

º» ¿¬±¸´Â µµÀçÀüºÎÁÖÁ¶°ü¿¡ »ç¿ëµÇ´Â µµÀçÀç·á ÁßÀÇ ÇϳªÀÎ Ceramco ¥± ºí·Ï½ÃÆí 48°³¸¦ Á¦Á¶ÀÚÀÇ Áö½Ã´ë·Î µµÀç¼Ò¼ºÇÑÈÄ ¼Ò¼ºÈ°Åùý°ú ¿¬¸¶¹ýÀÇ È°Åõµ¸¦ ºñ±³Çϱâ À§ÇØ ±×¸°½ºÅæÀ¸·Î 15,000RPMÀÇ ¼Óµµ·Î 30ÃÊ°£ ÀÎÀ§ÀûÀÎ °ÅÄ¥±â¸¦ ºÎ¿©ÇÏ°í 25¥ìm aluminum oxide·Î 15ÃÊ°£ »÷µåºí¶ó½ºÆÃÇÑ ½ÃÆíÀ» Á¦ÀÛÇÏ°í ½ÃÆíÀ» 12°³¾¿ ÀÓÀÇ·Î ºÐ·ùÇÏ¿© 4°³ÀÇ ±ºÀ¸·Î ³ª´©¾ú´Ù. ½ÃÆíÀ» Á¦Á¶ÀÚÀÇ Áö½Ã´ë·Î ÀÚ°¡¼Ò¼ºÈ°ÅÃÇÏ°í ¿¬¸¶½Ã½ºÅÛÀ» ÀÌ¿ëÇÏ¿© À°¾È °üÂû·Î È°ÅÃÀ» ´À³¥ ¸¸Å­ÀÇ °ú¿¬¸¶¸¦ ½ÃÇàÇÑ °ÍÀ» ½ÇÇè I±ºÀ¸·Î ÇÏ°í, °ÅÄ£ Ç¥¸éÀ» ¿¬¸¶½Ã½ºÅÛ¸¸À» ÀÌ¿ëÇÏ¿© ¿¬¸¶¸¦ ½ÃÇàÇÑ ±ºÀ» ½ÇÇè ¥±±º, °ÅÄ£ Ç¥¸é¿¡ È°ÅÃ¾× Vitachrom ¡°L¡±-fluid(Vita Zahnfabrik Co. Germany)¸¦ ÷°¡ÈÄ ¼Ò¼ºÈ°ÅÃÀ» ½ÃÇàÇÑ °ÍÀ» ½ÇÇ襲±º, ±×¸®°í ÀÚ°¡¼Ò¼ºÈ°Åø¸ ÇÑ °ÍÀ» ½ÇÇ襳±ºÀ¸·Î ºÐ·ùÇÏ¿´´Ù. Ç¥¸é°ÅÄ¥±â Å×½ºÅ͸¦ ÀÌ¿ëÇÏ¿© °¡»óÁ߽ɼ±°ÅÄ¥±â (Arithmetic meats roughness value, Ra), 10Á¡Æò±ÕÃÖ´ë³ôÀÌ(Rz), ±×¸®°í ÃÖ´ëÇ¥¸é°ÅÄ¥±â (Maximum individual peak-to-valley heights, Rmax)¸¦ °¢ ½ÃÆí´ç 5ȸ ÃøÁ¤ÇÑ ÈÄ Æò±Õ°ªÀ» Ãâ·Â ±â·ÏÇÏ´Â °úÁ¤À» ½ÃÇàÇÏ¿´´Ù. ¶ÇÇÑ ÁÖ»çÀüÀÚÇö¹Ì°æÀÇ °üÂûÀ» À§ÇÏ¿© ½ÃÆíÀÇ µµÀçºÎºÐÀ» ±Ý ÇöóÁ ÄÚÆÃÈÄ ÁÖ»çÀüÀÚÇö¹Ì°æ (5-570, Hibachi Co., Japan)À» ÀÌ¿ëÇÏ¿© 200¹è¿Í 500¹è È®´ë °üÂûÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù. 1. ÀÚ°¡¼Ò¼ºÈ°ÅÃÈÄ ¿¬¸¶½Ã½ºÅÛÀ» »ç¿ëÇÏ¿© °ú¿¬¸¶¸¦ ½ÃÇàÇÑ ½ÇÇè I±º°ú ¿¬¸¶½Ã½ºÅÛ¸¸À» »ç¿ëÇÏ¿© È°ÅýÃŲ ½ÇÇ襱±ºÀÌ È°Åþ×÷°¡ ÈÄ ¼Ò¼ºÃ³¸® ÇÑ ½ÇÇè ¥²±º°ú ÀÚ°¡¼Ò¼ºÈ°ÅýÃŲ ½ÇÇè ¥³±ºº¸´Ù ´õ ³·Àº ¼öÄ¡ÀÇ °¡»óÁ߽ɼ±°ÅÄ¥±â(Ra)¸¦ º¸¿´´Ù(P<0.01). 2. ÀÚ°¡¼Ò¼ºÈ°ÅÃÈÄ ¿¬¸¶½Ã½ºÅÛÀ» »ç¿ëÇÏ¿© °ú¿¬¸¶¸¦ ½ÃÇàÇÑ ½ÇÇè I±º°ú ¿¬¸¶½Ã½ºÅÛ¸¸À» »ç¿ëÇÏ¿© È°ÅýÃŲ ½ÇÇè ¥±±ºÀÌ È°Åþ×÷°¡ ÈÄ ¼Ò¼ºÃ³¸®ÇÑ ½ÇÇè ¥²±º°ú ÀÚ°¡¼Ò¼ºÈ°Åýà Ų ½ÇÇè ¥³±ºº¸´Ù ´õ ³·Àº ¼öÄ¡ÀÇ 10Á¡Æò±ÕÃÖ´ë³ôÀÌ(Rz)¸¦ º¸¿´´Ù(P<0.01). 3. ÀÚ°¡¼Ò¼ºÈ°ÅÃÈÄ ¿¬¸¶½Ã½ºÅÛÀ» »ç¿ëÇÏ¿© °ú¿¬¸¶¸¦ ½ÃÇàÇÑ ½ÇÇè I±º°ú ¿¬¸¶½Ã½ºÅÛ¸¸À» »ç¿ëÇÏ¿© È°ÅýÃŲ ½ÇÇèll±ºÀÌ È°Åþ×÷°¡ ÈÄ ¼Ò¼ºÃ³¸®ÇÑ ½ÇÇè ¥°±º°ú ÀÚ°¡¼Ò¼ºÈ°ÅýÃŲ ½ÇÇè ¥²±ºº¸´Ù ´õ ³·Àº ¼öÄ¡ÀÇ ÃÖ´ë °ÅÄ¥±â(Rmax)¸¦ º¸¿´´Ù(P<0.01). 4. ÁÖ»ç ÀüÀÚ Çö¹Ì°æ ¼Ò°ß¿¡¼­´Â I±º, ¥±±º, ¥²±º, ¥³±ºÀÇ ¼øÀ¸·Î °ÅÄ¥±â¸¦ º¸¿´´Ù.

This study was designed to compare the smoothness by glazing method with that by polishing method after 48 specimens of Ceramco II block, one of porcelain materials used for PFM, were baked according to the manufacturer¡¯s directions. The specimens were roughened with new green stone at 15,000rpm for 30 seconds and sandblasted with 25microliteraluminum oxide for 15 seconds. They were divided into 4 groups at random, and 4 groups were prepared as follows : Group I : specimens were autoglazed and overpolished with polishing system. Group II specimens were polished with only polishing system. Group IIIspecimens were glazed after adding glazing liquid, vitachrom "L"-fluid (vita zahnfabrik co. Germany) to the rough surface Group v : specimens were just autoglazed Using the surface roughness tester, Ra, Rmax, and Rz were estimated 5 times per specimen, and recording process of mean value was repeated 3 times. The results were as follows : 1. The Ra of group I and group IIwas lower than group IIIand group IV (p<001). 2. There was lower value of Rz in group I and group II than group III and group IV (p<001). 3. The Rmax of group I(overpolished with polishing system after autoglazing) and group II(polished with only polishing system) was lower than group III(glazed after adding glazing liquid) and group IV (autoglazed) (p<001). 4. There was not a statistically significant difference between group I and II and between group III and IV (p>001). 5. The roughness was increase in order of group I,II,III,IV in SEM

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porcelain surface; roughness tester; polishing system

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