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Nd:YAG ·¹ÀÌÀú Á¶»ç°¡ Calcium Fluoride Çü¼º ¹× Ä¡¾Æ ³»»ê¼º¿¡ ¹ÌÄ¡´Â ¿µÇâ

THE EFFECT OF ND:YAG LASER IRRADIATION ON THE FORMATION OF CALCIUM FLUORIDE AND ACID RESISTANCE OF TOOTH ENAMEL

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Abstract

ºÒ¼ÒµµÆ÷½Ã ÁÖ·Î Çü¼ºµÇ´Â calcium fluoride´Â ±¸°­³» ȯ°æ¿¡¼­ pH¿¡ ÀÇÇØ Á¶ÀýµÇ´Â ºÒ¼ÒÀÇ ÀúÀå°í ¿ªÇÒÀ» ÇÏ¿© Ä¡¾Æ¿ì½Ä ¿¹¹æ¿¡ À־ Áß¿äÇÑ ¿ªÇÒÀ» ÇÏ´Â °ÍÀ¸·Î ¾Ë·ÁÁ® ÀÖ´Ù. µû¶ó¼­ ºÒ¼ÒµµÆ÷ÀÇ ¿ì½Ä¿¹¹æ È¿°ú´Â calcium fluoride¸¦ ¾ó¸¶³ª ¸¹ÀÌ Çü¼º½ÃÄÑ ¿À·¡ Áö¼Ó½ÃÅ°´Â °¡¿¡ ´Þ·ÁÀÖ´Ù. ÀÌ¿¡ Ä¡¾Æ ³»»ê¼º Áõ°¡¿¡ È¿°ú ÀÖ´Ù°í ¾Ë·ÁÁø Nd:YAG ·¹ÀÌÀú Á¶»ç°¡ calcium fluorideÇü¼º ¹× Ä¡¾Æ ³»»ê¼º¿¡ ¹ÌÄ¡´Â ¿µÇâ¿¡ ´ëÇØ ¾Ë¾Æº¸±â À§Çؼ­ ½ÇÇèÀ» ½ÃÇàÇÏ¿´´Ù.
¼ÒÀÇ ¿µ±¸ÀüÄ¡¿¡¼­ 276°³ÀÇ ½ÃÆíÀ» Á¦ÀÛÇÏ¿© ¾Æ¹«·± óġ¸¦ ÇÏÁö ¾ÊÀº ±ºÀ» ´ëÁ¶±ºÀ¸·Î ÇÏ°í 1.23% acidulated phosphate fluoride (APF) 5ºÐ, 30ºÐ µµÆ÷ ¹× Nd:YAG ·¹ÀÌÀú Á¶»ç¿¡³ÊÁö ¹Ðµµ 20J£¯§², 40J£¯§² ÀÇ Á¶°Ç¿¡ µû¶ó ºÒ¼Ò µµÆ÷±º, ·¹ÀÌÀú Á¶»ç±º, ºÒ¼Ò µµÆ÷ÈÄ ·¹ÀÌÀú Á¶»ç±º, ·¹ÀÌÀú Á¶»çÈÄ ºÒ¼Ò µµÆ÷±ºÀ¸·Î ºÐ·ùÇϾú´Ù. ºÒ¼ÒµµÆ÷¸¦ ½ÃÇàÇÑ °æ¿ì À̸¦ ´Ù½Ã KOH ó¸® ¿©ºÎ¿¡ µû¶ó ³ª´©¾î 23°³ÀÇ ½ÇÇèÁ¶°ÇÀ» ¸¸µé¾ú´Ù. °¢ ½ÇÇèÁ¶°Ç¿¡ 12°³ÀÇ ½ÃÆíÀ» ¹èÁ¤ÇÏ°í ÀÌÁß 10°³ÀÇ ½ÃÆíÀº ºÒ¼Ò ¹× ¹«±âÀÎ ÃøÁ¤¿¡, ³ª¸ÓÁö 2°³ÀÇ ½ÃÆíÀº Ç¥¸é °üÂû¿¡ »ç¿ëÇÏ¿´´Ù. KOH ºñóġ±º¿¡¼­ 0.1 N HC104·Î enamel biopsy¸¦ ½ÃÇàÇÏ¿© Żȸ ¹ý¶ûÁúÀÇ ºÒ¼Ò³óµµ ¹× Żȸ±íÀ̸¦ ÃøÁ¤ÇÏ¿´À¸¸ç, KOH óġ±º¿¡¼­´Â 1 M KOH·Î 24½Ã°£ ó¸®ÇÏ¿© calcium fluoride¸¦ Á¤·® ÈÄ enamel biopsy¸¦ ½ÃÇàÇÏ¿´´Ù. ½ÇÇè°á°ú ¾ò¾îÁø ÀÚ·á ¹× ÁÖ»çÀüÀÚÇö¹Ì°æ °üÂû ¼Ò°ßÀ» ºñ±³ÇÏ¿© ´ÙÀ½ÀÇ °á°ú¸¦ ¾ò¾ú´Ù.
1. KOH ºñóġ±º¿¡¼­ ŻȸµÈ ¹ý¶ûÁúÀÇ ºÒ¼Ò³óµµ´Â ·¹ÀÌÀúÁ¶»ç ÈÄ ºÒ¼ÒµµÆ÷½Ã ·¹ÀÌÀú ¿¡³ÊÁö ¹Ðµµ Áõ°¡¿¡ µû¶ó Áõ°¡µÇ´Â °æÇâÀ» º¸¿´´Ù.
2. KOH ºñóġ±º¿¡¼­ ¹ý¶ûÁú Żȸ±íÀÌ´Â ºÒ¼Ò¸¦ 5ºÐ µµÆ÷ÈÄ ·¹ÀÌÀú 20J£¯§²¸¦ Á¶»çÇÑ °æ¿ì¸¦ Á¦¿ÜÇÏ°í´Â ·¹ÀÌÀú¿Í ºÒ¼Ò¸¦ º´ÇàÇÏ¿© óġ½Ã °¢°¢À» ´Üµ¶À¸·Î óġ½Ãº¸´Ù Żȸ±íÀÌ°¡ ÀÛ¾Ò´Ù (p<0.05).
3. Calcium fluorideÀÇ ¾çÀº ·¹ÀÌÀúÀÇ Á¶»ç¿¡ ÀÇÇØ À¯ÀÇ ÀÖ°Ô Áõ°¡ÇÏÁö ¾Ê¾Ò´Ù(p>0.05).
4. Calcium fluoride ÀÔÀÚ´Â ºÒ¼Ò¸¸ µµÆ÷ÇÑ °æ¿ì¿¡ ºñÇØ ·¹ÀÌÀú Á¶»çÈÄ ºÒ¼ÒµµÆ÷½Ã ÀÔÀÚÅ©±â°¡ Áõ°¡µÇ¾úÀ¸¸ç, ºÒ¼ÒµµÆ÷ÈÄ ·¹ÀÌÀú Á¶»ç½Ã ÀÔÀÚÅ©±âÀÇ Áõ°¡¿Í ÇÔ²² ÀϺΠÀ¶ÇÕµÈ ¾ç»óÀ» º¸¿´´Ù.
5. KOH óġ±º¿¡¼­ ¹ý¶ûÁúÀÇ ºÒ¼Ò³óµµ´Â ºÒ¼Ò¸¦ 30ºÐ µµÆ÷ÈÄ ·¹ÀÌÀú¸¦ Á¶»çÇÑ °æ¿ì¸¦ Á¦¿ÜÇÏ°í´Â ´ëÁ¶±ºÀÇ ºÒ¼Ò³óµµ¿Í À¯ÀÇÇÑ Â÷ÀÌ°¡ ¾ø¾ú´Ù(p>0.05).
6. KOH óġ±º¿¡¼­ ºÒ¼Ò¿Í ·¹ÀÌÀú¸¦ º´ÇàÇÑ °æ¿ì, ºÒ¼Ò¸¸ µµÆ÷ÇÑ °æ¿ìº¸´Ù ŻȸµÈ ¹ý¶ûÁúÀÇ ±íÀÌ°¡ ÀÛ¾Ò´Ù(p<0.05).
7. KOH ºñóġ±º¿¡¼­ ŻȸµÈ ¹ý¶ûÁúÀÇ ºÒ¼ø³óµµ¿Í Żȸ±íÀÌÀÇ »ó°ü°ü°è(Spearman correlation coefficient: -0.6281)´Â KOH óġ±º (Spearman correlation coeficient: -0.3792)¿¡ ºñÇØ ³ôÀº À½ÀÇ »ó°ü °ü°è¸¦ º¸¿´°í,µ¿ÀÏÇÑ Á¶°ÇÀ¸·Î ºÒ¼ÒµµÆ÷ ¹× ·¹ÀÌÀú Á¶»ç¸¦ ½ÃÇàÇÑ °æ¿ì¿¡ À־ KOHó¸® ¿©ºÎ¿¡ µû¸¥ Żȸ¹ý¶ûÁú ±íÀÌÀÇ À¯ÀÇÂ÷°¡ ÀÖ´Â °æ¿ì calcium fluorideÀÇ Çü¼º·®ÀÌ ¸¹¾Ò´Ù
ÀÌ»óÀÇ ½ÇÇè°á°ú·Î ¹Ì·ç¾î º¸¾Æ ·¹ÀÌÀú Á¶»ç°¡ calcium fluorideÀÇ Çü¼º·®¿¡ ¿µÇâÀ» ¹ÌÄ¡Áö ¾Ê¾ÒÀ¸³ª ·¹ÀÌÀú Á¶»çÀÇ ¿µÇâÀ¸·Î calcium fluorideÀÇ ¿ëÇØ°¡ °¨¼ÒÇÏ´Â °ÍÀ¸·Î ÆǴܵȴÙ. ¶ÇÇÑ ºÒ¼ÒµµÆ÷ ¹× ·¹ÀÌÀú Á¶»çÀÇ º´ÇàÀº °¢°¢À» ´Üµ¶À¸·Î óġÇÑ °æ¿ì¿¡ ºñÇÏ¿© Ä¡¾Æ ³»»ê¼º Áõ°¡¸é¿¡¼­ À¯¸®ÇϹǷΠÀÓ»ó¿¡¼­ ºÒ¼ÒµµÆ÷Áֱ⠿¬Àå°ú °°Àº À¯¿ëÇÑ °á°ú¸¦ ¾òÀ» ¼ö ÀÖÀ» °ÍÀ¸·Î »ý°¢µÈ´Ù.

Calcium fluoride, created by topical fluoride application, is the reservoir for fluoride ion regu¡©lated by pH in the oral environment. Therefore. the amount and the maintenance of calcium flu¡©oride have an important role in preventing dental caries. The aim of this study is to evaluate the effect of Nd=YAG laser irradiation on the generation of calcium fluoride and the acid resistance of tooth enamel.
The bovine anterior permanent teeth were prepared (n = 276), and divided into following groups
no treatment (control), fluoride application alone, laser irradiation alone, laser irradiation af¡©ter fluoride application, and fluoride application after laser irradiation. And each group was sub¡©divided based on the application time of 1.23% acidulated phosphate fluoride (APF) ( 5 min and 30 min) and the irradiation energy of Nd:YAG laser (20 J/cm¢¥ and 40J/cm¢¥).
In case of fluoride application, each group was divided according to KOH treatment. Twenty three treatment conditions were made for this experiment and twelve specimens were assigned to each treatment condition. In each treatment condition, ten specimens were used for chemical analysis and two specimens were observed under SEM.
In groups without treating KOH, fluoride content and the depth of enamel dissolved were measured using enamel biopsy technique In pride was measured by the treatment wi h I KOH fo treating KOH, the amount of calcium I formed after KOH treatment 24 hours and enamel biopsy was p
The results were analyzed by the fluoride content and the depth
ena
el biopsy, amount and thickness of calcium fluoride, and the rface structures dissolved by T results are as follows:
of enamel
I . In groups without treating KOH, the fluoride content of removed en
lationship with the energy density of laser when the laser irradiated before hshowed a positive 2. In groups without treating KOH fluoride applicatic
the depth of enamel dissolved decreased more with the co,biped laser and fluoride treatment than with laser or fluoride treatment, of 20d/cm2 laser irradiation after 5 minute fluoride application ( except for the ca:
3. The amount of calcium fluoride did not increased p<0.05).0.05). by laser treatment with no statistical significance(
4. The particle size of calcium fluoride increased in case of fluoride r rrad ation, compared with fluoride application alone. In case of laser treatment after fluor i a plication, the particle size of calcium fluoride increased and some of the par treatment after fused as e ef.
5 There were no significant differences in the fluoride content of dissolved enamel between group
group, except for the case of laser irradiation after treatmen of APF for 30 minutes (p)0.05).
6. In groups with treating KOH, depth of removed enamel in the groups of combined treatmen with laser and fluoride was shallower than that in fluoride application
7. In groups without treating KOH, the relationship between fluoride c groups (he d p enamel dissolved showed more negative (Spearman correlation coefficient: oent 0a0n t depth rgroups with treating KOH (Spearman correlation coefficient: -0.3792). The greater of calcium fluoride could be found in case where there was a significant e greater amount of enamel dissolved between groups with and without treatinOH. differences of the depth
From these results, it can be concluded that laser seems to be a little effects calcium fluoride formation, but has some effect on the lowering the solubility of c the amount of As the combined treatment of laser and fluoride application showed more e calcium . property, more extended recall period for fluoride application can be achieved with acid-resistant treatment in the clinic.

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ºÒ¼ÒµµÆ÷;Nd:YAG ·¹ÀÌÀú;calcium fluoride;enamel biopsy;KOH;³»»ê¼º;acid-resistance;calcium fluoride;enamel biopsy;fluoride application;KOH;Nd:YAG laser

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