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THE EFFECT OF LASER IRRADIATION TO THE SHEAR BOND STRENGTH OF COMPOSITE RESIN TO DENTIN IN PRIMARY ANTERIOR TOOTH

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Abstract

°á·Ð
ÀúÀÚ´Â »ó¾ÆÁú¿¡ ´ëÇÑ º¹ÇÕ·¹ÁøÀÇ °áÇÕ°­µµ¿¡ ¹ÌÄ¡´Â CO2 ·¹ÀÌÀúÀÇ Á¶»çÈ¿
°ú¸¦ ¾Ë¾Æº¸±â À§ÇÏ¿© 120°³ÀÇ »ó¾Ç À¯ÀüÄ¡¸¦ ´ë»óÀ¸·Î, ÀÌ Áß 20°³´Â ´ëÁ¶±ºÀ¸·Î, 100°³´Â
½ÇÇ豺À¸·Î ÇÏ¿´À¸¸ç ´ëÁ¶±ºÀº ¾Æ¹«·± Ç¥¸é󸮵µ ÇÏÁö ¾Ê¾Ò°í, ½ÇÇ豺Àº 5°³±ºÀ¸·Î ³ª´©¾î
1±ºÀº 1.0 W, 2±ºÀº 1.5 W, 3±ºÀº 2.0 W, 4±ºÀº 2.5 W±×¸®°í 5±ºÀº 3.0WÀÇ Ãâ·ÂÀ¸·Î °¢°¢
0.2ÃÊ, 15ȸ¾¿ °ãÄ¡Áö ¾Êµµ·Ï Á¶¹ÐÇÏ°Ô Á¶»çÇÑ ÈÄ Ç¥¸éÀÇ º¯È­¸¦ ÁÖ»çÀüÀÚÇö¹Ì°æÀ¸·Î °üÂûÇÏ
°í Àü´Ü°áÇÕ°­µµ¸¦ ºñ±³ÇÏ¿© ´ÙÀ½°ú °°Àº °á·ÐÀ» ¾ò¾ú´Ù.
1. ·¹ÀÌÀú Á¶»ç±ºÀÌ ´ëÁ¶±º¿¡ ºñÇÏ¿© ³ôÀº Àü´Ü°áÇÕ°­µµ¸¦ º¸¿´´Ù(P<0.05).
2. ·¹ÀÌÀú Á¶»ç¿¡ ÀÇÇØ »ó¾ÆÁú Ç¥¸éÀÇ ½º¸Þ¾îÃþÀÌ Á¦°ÅµÇ¾ú´Ù.
3. Àü´Ü°áÇÕ°­µµ´Â ½ÇÇè 2±º¿¡¼­ °¡Àå ³ô°Ô ³ªÅ¸³µÀ¸¸ç, ±× ´ÙÀ½Àº ½ÇÇè 1, 5, 4, 3±ºÀÇ ¼ø
À̾ú´Ù. ½ÇÇè 2±ºÀº ´Ù¸¥ ±º°ú À¯ÀÇÇÑ Â÷À̸¦ º¸¿´À¸¸ç(P<0.05), ½ÇÇè 1±ºÀº ½ÇÇè 2, 3±º°ú
À¯ÀÇÇÑ Â÷ÀÌ(P<0.05)¸¦ º¸ÀÎ ¹Ý¸é¿¡ ½ÇÇè 3, 4, 5±º°£ÀÇ Â÷ÀÌ´Â ¾ø¾ú´Ù.
4. ·¹ÀÌÀúÀÇ Ãâ·ÂÀÌ Áõ°¡ÇÔ¿¡ µû¶ó ½ÇÇè 3±ººÎÅÍ »ó¾ÆÁú Ç¥¸éÀÇ À¶ÇÕÀÌ ³ªÅ¸³µ´Ù.

The purpose of this study is to compare the shear bond strength of composite resin
to dentin which was irradiated by CO2 laser.
120 primary anterior teeth were divided into one control and five experimental groups.
Control group was not surface-treated and experimental groups were laser-irradiated.
The CO2 laser was used at the power of 1.0 W, 0.2 sec(Experimental
group 1), 1.5 W, 0.2 sec(Experimental group 2), 2.0 W, 0.2 sec(Experimental group 3),
2.5 W, 0.2 sec(Experimental group 4) and 3.0 W, 0.2 sec(Experimental group 5).
The smear layer on the surface of dentin was removed, the orifices of dentinal
tubules were opened and the shear bond strength of composite resin to dentin was
increased by the irradiation of CO2 laser.
The results were as follows:
1. Higher shear bond strength was obtained in laser pre-treated groups than contol
group.
2. The smear layer on the surface of dentin was removed by the irradiation of
CO2 laser.
3. The highest shear bond strength was found in experimental group 2 and followed
by experimental group 1, 5, 4 and 3. Experimental group 2 shows a significant
difference from other groups(P<0.05), experimental group 1 shows a significant
difference from experimental group 2, 3(P<0.05) and there was no significant difference
between experimental group 3, 4 and 5.
4. Surface-fusion of the dentin was occurred in experimental group 3, 4, 5 according
to the increase of the laser energy.

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