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EFFECT OF LASER IRRADIATION ON DENTIN SURFACE STRUCTURE AND SHEAR BOND STRENGTH OF LIGHT-CURED GLASS IONOMER.

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Abstract

°á ·Ð
º» ¿¬±¸¿¡¼­´Â Nd-YAG ·¹ÀÌÀú¸¦ »ó¾ÆÁú Ç¥¸é¿¡ Á¶»çÇÑ ÈÄ »ó¾ÆÁú Ç¥¸é±¸Á¶ º¯È­¸¦ ÁÖ
»çÀüÀÚÇö¹Ì°æÀ¸·Î °üÂûÇÏ¿´°í, ¾Æ¹«°Íµµ ó¸®ÇÏÁö ¾ÊÀº ´ëÁ¶±º°ú Åë»óÀûÀ¸·Î ÀÓ»ó¿¡¼­ »ç¿ë
ÇÏ°í ÀÖ´Â Æú¸®¾ÆÅ©¸±¸¯ »êÀ¸·Î ó¸®ÇÑ ±º°ú ·¹ÀÌÀú¸¦ Á¶»çÇÑ ±ºÀÇ »ó¾ÆÁú Ç¥¸éÀ§¿¡ ºÎÂøµÈ
±Û¶ó½º ¾ÆÀÌ¿À³ÊÀÇ Àü´Ü °­µµ¸¦ ÃøÁ¤ÇÏ¿© ´ÙÀ½°ú °°Àº °á·ÐÀ» ¾ò¾ú´Ù.
1. »ó¾ÆÁú Àü´Ü°­µµ´Â Æú¸®¾ÆÅ©¸±¸¯ »êÀ¸·Î ó¸®ÇÑ ¥±±º¿¡¼­ °¡Àå ³ô°Ô ³ªÅ¸³µ°í, ´ëÁ¶±º,
¥², ¥³, ¥´±º º¸´Ù ¸ðµÎ À¯ÀǼº ÀÖ°Ô ³ô°Ô ³ªÅ¸³µ´Ù.
2. ·¹ÀÌÀú Á¶»ç±ºÀº ´ëÁ¶±º º¸´Ù´Â ¾à°£ ³ôÀº Àü´Ü°­µµ¸¦ ³ªÅ¸³ÂÀ¸³ª À¯ÀǼºÀº ¾ø¾ú°í, Á¶
»ç ½Ã°£¿¡ µû¸¥ Àü´Ü°­µµ´Â ½Ã°£ÀÌ Áõ°¡ÇÒ¼ö·Ï °¨¼ÒÇϳª À¯ÀǼºÀº ¾ø¾ú´Ù.
3. ÁÖ»çÀüÀÚÇö¹Ì°æ °üÂû °á°ú, »ó¾ÆÁú¸éÀº ¿ëÀ¶µÇ°í À¶ÇÕµÈ Ç¥¸éÀ» ³ªÅ¸³Â°í, Á¶Àý±º¿¡ ºñ
ÇØ ÆòźÇÏ°í ±ú²ýÇÑ Ç¥¸éÀ» ³ªÅ¸³Â°í ·¹ÀÌÀú Á¶»ç½Ã°£ÀÌ Áõ°¡ÇÒ¼ö·Ï ±ÔÄ¢ÀûÀÎ ¹Ì¼¼ Àܱݵé
ÀÌ ³ªÅ¸³µ´Ù.
4. ·¹ÀÌÀú Á¶»çÈÄÀÇ ¹Ì¼¼ °ø°£°ú ºÒ±ÔÄ¢ÀûÀΠǥ¸éÇüÅ´ Àü´Ü°­µµ¿¡ ¹Ù¶÷Á÷ÇÏÁö ¾ÊÀº °á
°ú¸¦ °¡Á®¿ÔÀ¸³ª, ÀÌ´Â Àç·á°¡ Ç¥¸é ±¸Á¶ ³»·Î µµ´ÞÇÏÁö ¾ÊÀº °á°úÀÎÁö, ·¹ÀÌÀú Á¶»çÈÄ ÀÇ
Ç¥¸é±¸Á¶ ÀÚü°¡ Àç·áÀÇ °áÇÕ°­µµ¸¦ °¨¼Ò½ÃÅ°´Â °ÍÀÎÁö¿¡ ´ëÇÑ Ãß°¡ ¿¬±¸°¡ ÀÌ·ç¾îÁ®¾ß ÇÒ
°ÍÀÌ´Ù. ¶ÇÇÑ Nd-YAG ·¹ÀÌÀúÀÇ Á¶»çÁ¶°ÇÀ» ´Þ¸®ÇÑ Ãß°¡ ¿¬±¸µµ ÀÌ·ç¾îÁ®¾ß ÇÒ °ÍÀÌ´Ù.
#ÃÊ·Ï#
The purpose of this study was, to evaluate the possible efficacy of Nd-YAG laser as
a dentin conditioner by observing the laser irradiation dentin surface under scanning
electron micrograph and measuring shear bond strength of restored light-cured glass
monomer mold.
Fifty intact premolars were prepared for shear bond strength tests.
The teeth were randomly divided Into five groups as follows
Group ¥°. no treatment
Group ¥±. 10% polyacrylic acid, 20 sec
Group ¥². laser treatment 2 w, 20 Hz, 2 sec
Group ¥³. laser treatment 2 w, 20 Hz, 5 sec
Group ¥´. laser treatment 2 w, 20 Hz, 10 sec
Samples of each group were restored with light-cored glass ionomer cement after
dentin conditioning and then measuring the sheath bond strength of each specimen were
measured using universal testing machine.
Additional ten premolars were prepared for SEM analysis
The result from the this study can be summarized as follows.
1. Shear bond strength of polyacrylic acid-treated group ¥± was significantly higher
than other groups (p<0.05).
2. No statistcally significant difference Gould be found between three laser-treated
groups (¥², ¥³, ¥´) In sheath bond strength(P>0.05)
3.. According to the result of observation under SEM, Polyacrylic acid was shown to
knave removed the smear layer effectively and opened the dentinal tubules, whereas the
laser has produced the irregular surface mainly Composed of melted and fused structure.
The microcracks found in laser-treated eaten groups Increased In number with
Irradiation time and formed the regular mesh-type In 10 sec-irradiation group.
4. The ultrastructural change of dentin surface created by laser irradiation was found
to the Improper for bonding of the glass ionomer restorative materials. And the lowed
shear bond strength of laser irradiated group might have been due to the failure to form
the stilt-able dentin surface fort the glass monomer to penetrated into and foam the
proper micromechanical retention.

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