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THE INFLUENCE OF pH AND LACTIC ACID CONCENTRATION ON THE FORMATION OF ARTIFICIAL ROOT CARIES IN ACID BUFFER SOLUTION

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¿ÀÇö¼® ( Oh Hyun-Suk ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Á¸Çб³½Ç
³ëº´´ö ( Roh Byoung-Duck ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Á¸Çб³½Ç
ÀÌÂù¿µ ( Lee Chan-Young ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ Ä¡°úº¸Á¸Çб³½Ç

Abstract

Ä¡±Ù ¿ì½ÄÁõÀº º¹ÇÕÀûÀÎ ¿äÀο¡ ÀÇÇØ ¹ß»ýµÇ´Â ÁúȯÀ¸·Î °í·É Àα¸ÀÇ Áõ°¡·Î ÃÖ±Ù Áõ°¡Ãß¼¼¿¡ ÀÖÀ¸³ª ¾ÆÁ÷±îÁö´Â º´¼Ò ±íÀÌ, »ó¾ÆÁú ŻȸÀÇ Á¤µµ ¹× ¾ç»ó, collagenÀÇ Æı« Á¤µµ ¹× ¼ö»êÈ­ÀÎȸ¼® °áÁ¤ º¯È­¿¡ ´ëÇÑ Å»È¸ ¿ÏÃæ¾×ÀÇ Á¶Á÷ÇÐÀû ¿¬±¸´Â ¹ÌºñÇÑ ½ÇÁ¤ÀÌ´Ù. º» ¿¬±¸´Â ¿ì½Ä Çü¼º¿¡ ¿µÇâÀ» ÁÖ´Â »ê ¿ÏÃæ¿ë¾× ³»ÀÇ pH¿Í À¯»êÀÇ ³óµµº¯È­¿¡ µû¸¥ Ä¡±Ù »ó¾ÆÁú ¿ì½Ä º´¼ÒÀÇ ÁøÇà¿¡ ¹ÌÄ¡´Â º¯È­¸¦ Æí±¤Çö¹Ì°æÀ» ÀÌ¿ëÇÏ¿© °üÂûÇÏ°í °üÂûµÈ ¿ì½Ä º´¼ÒÃþÀÇ ¼ö»êÈ­ÀÎȸ¼®ÀÇ °áÁ¤ ÇüÅ º¯È­¸¦ ÁÖ»çÀüÀÚÇö¹Ì°æÀ¸·Î °üÂûÇÏ¿© Żȸ °úÁ¤À» »ìÆ캸°íÀÚ ¼¼ °¡Áö pH (4.3, 5.0, 5.5)±º°ú °¢°¢ÀÇ pH±º¿¡ ¼¼ °¡Áö À¯»êÀÇ ³óµµ (25mM, 50 mM, 100 mM)¸¦ ÀÌ¿ëÇÏ¿© ÀΰøÄ¡±Ù ¿ì½ÄÀ» Çü¼ºÇÑ ÈÄ ºñ±³ ºÐ¼®ÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù. 1. Æí±¤Çö¹Ì°æ ¼Ò°ß¿¡¼­ ¿ì½Ä º´¼ÒÀÇ ±íÀÌ´Â pHº¸´Ù´Â À¯»êÀÇ ³óµµ¿¡ ÀÇÇØ ´õ ¿µÇâÀ» ¸¹ÀÌ ¹Þ¾Ò´Ù. 2. ÁÖ»çÀüÀÚÇö¹Ì°æ ¼Ò°ß¿¡¼­ À¯»êÀÇ ³óµµ°¡ ³ô¾ÆÁú¼ö·Ï ±×¸®°í pH°¡ ³·¾ÆÁú¼ö·Ï ¼ö»êÈ­ÀÎȸ¼® °áÁ¤ÀÇ ¼Ò½ÇÀÌ ´õ ¸¹ÀÌ ÁøÇàµÇ¾ú´Ù. 3. Żȸ´Â ¼ö»êÈ­ÀÎȸ¼® °áÁ¤ÀÇ º¯¿¬ºÎ°¡ ¼Ò½ÇµÇ¸ç °áÁ¤ cluster³» °áÁ¤ÀÇ ¼ýÀÚ ¹× Å©±â°¡ °¨¼ÒÇÏ¿´°í °áÁ¤ cluster »çÀÌÀÇ °£°ÝÀÌ ³Ð¾îÁö´Â ¾ç»óÀ¸·Î °üÂûµÇ¾ú´Ù. 4. Ç¥¸éÃþ¿¡¼­ÀÇ ÁÖ»çÀüÀÚÇö¹Ì°æ °üÂû ½Ã À¯»êÀÇ ³óµµ°¡ ³ô¾ÆÁú·Ï ¼ö»êÈ­ÀÎȸ¼® °áÁ¤ clusterÀÇ ÇüÅ´ ¼Ò½ÇµÇ°í Äݶó°Õ ¼¶À¯ Ç¥¸é¿¡ ¼ö»êÈ­ÀÎȸ¼® °áÁ¤ÀÇ ¿ëÇØ, Àç°áÇÕµÈ ¾ç»óÀ¸·Î °üÂûµÇ¾ú´Ù. 5. Żȸ °úÁ¤¿¡ ´ëÇÑ ÁÖ»çÀüÀÚÇö¹Ì°æ °üÂû ½Ã »ó¾ÆÁúÀÇ Å»È¸´Â ´Ü¼øÈ÷ Żȸ¸¸ µ¶¸³ÀûÀ¸·Î ÀϾ´Â °úÁ¤ÀÌ ¾Æ´Ñ Żȸ¿Í À籤ȭ°¡ µ¿½Ã¿¡ ÀϾ´Â ¾ç»óÀ¸·Î °üÂûµÇ¾ú´Ù. ÀÌ»óÀÇ °á°ú »ê ¿ÏÃæ¿ë¾× ³»ÀÇ À¯»êÀÇ ³óµµ°¡ ³ô¾ÆÁö°í pH°¡ ³·¾ÆÁú¼ö·Ï ŻȸÀÇ ¼Óµµ°¡ Áõ°¡ÇÏ°í ŻȸÀÇ °úÁ¤Àº ¼ö»êÈ­ÀÎȸ¼® °áÁ¤ clusterÀÇ Ç¥¸éÀ¸·ÎºÎÅÍ ÁøÇàµÇ¸ç ½Ã°£ÀÌ °æ°úÇÔ¿¡ µû¶ó ¼ö»êÈ­ÀÎȸ¼® °áÁ¤ÀÇ ÇüÅ´ ¿øÇü ¶Ç´Â Ÿ¿øÇü¿¡¼­ ºÒ±ÔÄ¢ÇÑ ÇüÅ·Πº¯È­µÇ¾ú´Ù.

The purpose of this study is to compare and to evaluate the effect of pH and lactic acid concentration on the progression of artificial root caries lesion using polarizing microscope, and to evaluate the morphological changes of hydroxyapatite crystals of the demineralized area and to investigate the process of demineralization using scanning electron microscope. Artificial root caries lesion was created by dividing specimens into 3 pH groups (pH 4.3, 5.0, 5.5), and each pH group was divided into 3 lactic acid concentration groups (25 mM, 50 mM, 100 mM). Each group was immersed in acid buffer solution for 5 days and examined. The results were as follows : 1. Under polarized microscope, the depth of lesion was more effected by the lactic acid concentration rather than the pH. 2. Under scanning electron microscope, dissolution of hydroxyapatite crystals were increased as the lactic acid concentration increased and the pH decreased. 3. Demineralized hydroxyapatite crystals showed peripheral dissolution and decreased size and number within cluster of hydroxyapatite crystals and widening of intercluster and intercrystal spaces as the pH decreased and the lactic acid concentration increased. 4. Under scanning electron microscope evaluation of the surface zone, clusters of hydroxyapatite crystals were dissolved, and dissolution and reattachment of crystals on the surface of collagen fibrils were observed as the lactic acid concentration increased. 5. Under scanning electron microscope, demineralizatlon of dentin occurred not only independently but also with remineralization simultaneously. In conclusion, the study showed that pH and lactic acid concentration influenced the rate of progression of the lesion in artificial root caries. Demineralization process was progressed from the surface of the cluster of hydroxyapatite crystals and the morphology of hydroxyapatite crystals changed from round or elliptical shape into irregular shape as time elapsed.

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Ä¡±Ù ¿ì½ÄÁõ;»ê ¿ÏÃæ¿ë¾×;À¯»ê³óµµ;Żȸ;¼ö»êÈ­ÀÎȸ¼®;ÁÖ»çÀüÀÚÇö¹Ì°æ
Root caries;Acid buffer solution;pH;Lactic acid concentration;Demineralization;Hydroxyapatite;Scanning electron microscope

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