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THE CHANGE OF THE CONFIGURATION OF HYDROXYAPATITE CRYSTALS IN ENAMEL BY CHANGES OF PH AND DEGREE OF SATURATION OF LACTIC ACID BUFFER SOLUTION

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Àü¿µÀÇ ( Chon Young-Eui ) - ¿¬¼¼´ëÇб³ ´ëÇпø Ä¡ÀÇÇаú Ä¡°úº¸Á¸Çб³½Ç
Á¤ÀÏ¿µ ( Jung Il-Young ) - ¿¬¼¼´ëÇб³ ´ëÇпø Ä¡ÀÇÇаú Ä¡°úº¸Á¸Çб³½Ç
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ÀÌÂù¿µ ( Lee Chan-Young ) - ¿¬¼¼´ëÇб³ ´ëÇпø Ä¡ÀÇÇаú Ä¡°úº¸Á¸Çб³½Ç

Abstract

¹ý¶ûÁú Ãʱ⠿ì½ÄÀÌ È¸º¹µÈ´Ù´Â °ÍÀÌ º¸°íµÈ ÀÌ·¡ ¹ý¶ûÁú¿¡ ´ëÇÏ¿© ºÒ¼Ò¸¦ ÷°¡ÇÑ »óÅ¿¡¼­ ÇàÇß´ø ÀÌÀüÀÇ ¿¬±¸µéÀº ¹ý¶ûÁú Àΰø¿ì½ÄÀÇ À籤ȭ°¡ Ç¥¸éÃþÀÇ Áõ°¡¿Í ÇÔ²² º´¼Òº»Ã¼ÀÇ Æø °¨¼Ò°¡ ÀϾ´Ù´Â Á¤·®ÀûÀÎ Æò°¡´Â ¸¹ÀÌ ÇÏ¿´À¸³ª ºÒ¼Ò¸¦ ÷°¡ÇÏÁö ¾ÊÀº »óÅ¿¡¼­´Â À籤ȭ°¡ ÀϾ´Ù´Â ¿¬±¸´Â ºÎÁ·ÇÏ¿´°í, ¶Ç ¼ö»êÈ­ÀÎȸ¼® °áÁ¤ÀÇ ÀÔÀÚ º¯È­¿¡ ´ëÇÑ °üÂûµµ ¹ÌºñÇÏ¿´´Ù.
º» ¿¬±¸´Â Żȸ³ª ±Õ¿­ÀÌ ¾ø´Â ¼Ò±¸Ä¡ ¹× ´ë±¸Ä¡¸¦ ´ë»óÀ¸·Î Żȸ ¿ÏÃæ¿ë¾×À» ÀÌ¿ëÇÏ¿© ¹ý¶ûÁúÀ» 2ÀÏ°£ Żȸ½ÃÅ°°í, pH¿Í Æ÷È­µµ°¡ »óÀÌ ÇÑ 7°¡Áö À¯»ê ¿ÏÃæ¿ë¾×À¸·Î 10ÀÏ µ¿¾È À籤ȭ¸¦ À¯µµÇÑ ÈÄ Ä¡¾Æ¸¦ ÆÄÀý½ÃÄÑ ¼ö»êȸÀÎȸ¼® °áÁ¤ÀÇ º¯È­¸¦ ¿øÀÚÇö¹Ì°æ°ú ÁÖ»çÀüÀÚÇö¹Ì°æÀ» ÀÌ¿ëÇÏ¿© Á¤¼ºÀûÀ¸·Î ºñ±³ °üÂûÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù.
1. ŻȸµÈ ºÎÀ§¿¡¼­ °üÂûµÈ ¼ö»êÈ­ÀÎȸ¼® °áÁ¤Àº Á¤»óÀûÀÎ ¼ö»êÈ­ÀÎȸ¼® °áÁ¤º¸´Ù Å©±â°¡ ÀÛ¾ÒÀ¸¸ç °áÁ¤ »çÀÌÀÇ °ø°£ÀÌ Áõ°¡Çϸ鼭 °áÁ¤µéÀÌ ºÒ±ÔÄ¢ÇÏ°Ô Á¸ÀçÇÏ´Â °ÍÀÌ °üÂûµÇ¾ú´Ù.
2. À籤ȭµÈ ºÎÀ§¿¡¼­´Â Żȸ¿¡ ÀÇÇÏ¿© Çü¼ºµÈ ºó °ø°£¿¡ ÀÛÀº ¼ö»êÈ­ÀÎȸ¼® °áÁ¤ÀÌ »õ·Î ħÂøµÇ´Â ¾ç»ó°ú °áÁ¤µéÀÌ À¶ÇÕÇÏ¿© ´Ù¾çÇÑ ¸ð½ÀÀ» °®´Â ´õ Ä¿Áø °áÁ¤µéÀ» °üÂûÇÒ ¼ö ÀÖ¾ú´Ù.
3. µ¿ÀÏÇÑ pH¿¡¼­ Æ÷È­µµ°¡ ´õ ³ôÀº 3±º, 4±ºÀº 1±º, 2±º¿¡ ºñÇÏ¿© Ç¥¸éÃþ¿¡¼­ºÎÅÍ º´¼Òº»Ã¼±îÁö ÀÛÀº °áÁ¤µéÀÌ ¸ð¿© Å« cluster¸¦ Çü¼ºÇÏ¿´À¸¸ç ƯÈ÷ 4±º¿¡¼­´Â º´¼Òº»Ã¼±îÁö ¿ÏÀüÇÑ À籤ȭ°¡ ÀϾ´Ù. ºñ½ÁÇÑ Æ÷È­µµ¿¡¼­´Â pH°¡ ´õ ³·Àº 5±º, 6±ºÀº 7±º¿¡ ºñÇÏ¿© º´¼Òº»Ã¼±îÁö À籤ȭ°¡ ÀϾÀ¸¸ç 3±º, 4±ºÃ³·³ °áÁ¤µéÀÌ ¸ð¿© cluster¸¦ Çü¼ºÇϱ⺸´Ù´Â °³°³ÀÇ ÀÔÀÚµéÀÌ ¶Ñ·ÇÇÑ ¿ÜÇüÀ» °¡Áö¸ç ¸Å¿ì Ä¡¹ÐÇÏ°Ô ºÐÆ÷µÇ¾î ÀÖ¾ú´Ù.

Since it was reported that incipient enamel caries can be recovered, previous studies have quantitatively evaluated that enamel artificial caries have been, remineralized with fluoride showing simultaneously the increase of width of surface layer and the decrease of width of the body of legion. There is, however, little report which showed that remineralization could occur without fluoride. In addition, the observations on the change of hydroxyapatite crystals also have been scarcely seen. In this study, enamel caries in intact premolars or molars was induced by using lactic acidulated buffering solutions over 2 days. Then decalcified specimens were remineralized by seven groups of solutions using different degree of saturation(0.212, 0.239, 0.301, 0.355) and different pH(5.0, 5.5, 6.0) over 10 days. A qualitative comparison to changes of hydroxyapatite crystals after fracturing teeth was made under SEM(scanning electron microscopy) and AFM(atomic force microscopy).
The results were as follows:
1. The size of hydroxyapatite crystals in demineralized area was smaller than the normal ones. While the space among crystals was expanded, it was observed that crystals are arranged irregularly.
2. In remineralized enamel area, the enlarged crystals with various shape were observed when the crystals were fused and new small crystals in intercrystalline spaces were deposited.
3. Group 3 and 4 with higher degree of saturation at same pH showed the formation of large clusters by aggregation of small crystals from the surface layer to the lesion body than group 1 and 2 with relatively low degree of saturation at same pH did. Especially group 4 showed complete remineralization to the body of lesions. Group 5 and 6 with lower pH at similar degree of saturation showed remineralization to the body of lesions while group 7 didn¡¯t show it. Unlike in Group 3 and 4, Group 5 and 6 showed that each particle was densely distributed with clear appearance rather than crystals form clusters together.

Å°¿öµå

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Enamel;Remineralization;pH;Degree of saturation;Atomic force microscopy;Scanning electron microscopy

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