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THE EFFECT OF THE DENTIN SURFACE ROUGHNESS ON THE BOND STRENGTH OF A GLASS IONOMER CEMENT IN THE PRIMARY TEETH

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Abstract

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»ó¾ÆÁú¸éÀÇ Ç¥¸éÁ¶µµ°¡ ±Û¶ó½º ¾ÆÀÌ¿À³ë¸Ó ½Ã¸àÆ®ÀÇ °áÇÕ°­µµ¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» ¾Ë¾Æº¸°íÀÚ
30°³ÀÇ À¯±¸Ä¡¸¦ ´ë»óÀ¸·Î ÇÏ¿© »ó¾ÆÁú¸éÀ» ³ëÃâ½ÃÅ°°í 600¹ø ¿¬¸¶Áö·Î ¿¬¸¶ÇÑ µÚ ÃÖÁ¾ ¸¶
¹«¸® ¹æ¹ý¿¡ µû¶ó ´ÙÀ½ÀÇ 5±ºÀ¸·Î ³ª´©¾î ½ÇÇèÇÏ¿´´Ù.
1±º ; ´ëÁ¶±º(600-grit silicon carbide paper·Î ¸¶¹«¸®ÇÑ ±º)
2±º ; diamond bur(medium grain)·Î ¸¶¹«¸®ÇÑ ±º
3±º ; carbide cross-cut tapered fissure bur·Î ¸¶¹«¸®ÇÑ ±º
4±º ; wet pumice·Î ¸¶¹«¸®ÇÑ ±º
5±º ; dentin conditioner(25% polyacrylic acid)·Î 10ÃÊ°£ Àû¿ë½ÃŲ ±º »ó¾ÆÁú ¸¶¹«¸® ÈÄÀÇ
Ç¥¸éÁ¶µµ´Â Ç¥¸éÁ¶µµÃøÁ¤±â·Î ÃøÁ¤ÇÏ¿´°í ½Ã¸àÆ® Á¢ÇÕ ÈÄ °áÇÕ°­µµ´Â ¸¸´É½ÃÇè±â·Î ÃøÁ¤ÇÏ
¿´À¸¸ç, ¸¶¹«¸® ÈÄÀÇ Ç¥¸é¾ç»ó°ú ½ÃÆíÀÇ ÆÄÀý¸é ¾ç»óÀ» ÁÖ»çÀüÀÚÇö¹Ì°æÀ¸·Î °üÂûÇÏ¿© ´ÙÀ½
°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù.
»ó¾ÆÁú ¸¶¹«¸® ÈÄÀÇ Ç¥¸é¾ç»óÀº diamond bur±º¿¡¼­ Ç¥¸é±¼°îÀÌ °¡Àå µÎµå·¯Áö°í µµ¸»Ãþµµ
¸¹ÀÌ ³ªÅ¸³µÀ¸¸ç, pumice±º¿¡¼­ °¡Àå Ç¥¸é¾ç»óÀÌ ÆòÈ°ÇÏ¿´°í µµ¸»Ãþµµ °ÅÀÇ ¾ø¾ú´Ù.
Ç¥¸éÁ¶µµ ¼öÄ¡´Â diamond bur±º¿¡¼­ °¡Àå ³ô°Ô ³ªÅ¸³µ°í, ±× ´ÙÀ½À¸·Î carbide bur±º, ´ë
Á¶±º, dentin conditioner±ºÀÇ ¼øÀ̾ú°í pumice±º¿¡¼­ °¡Àå ³·°Ô ³ªÅ¸³µÀ¸¸ç(f=104.29,
p<0.001), ´ëÁ¶±º°ú dentin conditioner±º, pumice±º°ú dentin conditioner±º »çÀÌ¿¡¸¸ À¯ÀÇÇÑ
Â÷ÀÌ°¡ ¾ø¾ú´Ù(p<0.05).
°áÇÕ°­µµ´Â pumice±º¿¡¼­ °¡Àå ³ô°Ô ³ªÅ¸³µ°í, ±× ´ÙÀ½À¸·Î dentin conditioner±º, ´ëÁ¶±º,
carbide bur±ºÀÇ ¼øÀ̾ú°í diamond bur±º¿¡¼­ °¡Àå ³·°Ô ³ªÅ¸³µÀ¸¸ç(f=18.65, p<0.001),
pumince±º¿¡¼­ ´Ù¸¥ ¸ðµç ±º¿¡ ºñÇØ À¯ÀǼºÀÖ°Ô ³ô°Ô ³ªÅ¸³µ°í dentin conditioner±º¿¡¼­µµ
diamond, carbide bur±º¿¡ ºñÇØ À¯ÀǼºÀÖ°Ô ³ô°Ô ³ªÅ¸³µ´Ù(p<0.05).
»ó¾ÆÁú¸éÀÌ ÆòÈ°ÇÒ¼ö·Ï ±Û¶ó½º ¾ÆÀÌ¿À³ë¸Ó ½Ã¸àÆ®ÀÇ °áÇÕ°­µµ´Â ³ô°Ô ³ªÅ¸³µ´Ù.
½ÃÆíÀÇ ÆÄÀý¸é ¾ç»ó °üÂû°á°ú, °áÇÕ°­µµ°¡ Ŭ¼ö·Ï ÀÀÁý¼ºÆÄÀý(cohesive fracture)¾ç»óÀ» ³ª
Ÿ³Â´Ù.
#ÃÊ·Ï#
The purpose of this study was to evaluate the effect of the dentin surface roughness
on the bond strength of a glass ionomer cement in the primary teeth.
In this study, 30 deciduous molars with sound and healthy crown portion which were
extracted in normal exfoliative period were used. The dentin surfaces of these teeth
were exposed and polished with 600-grit silicon carbide paper and divided into 5 groups
according to the dentin finishing procedures :
Group 1 : control group(finishing with 600-grit silicon carbide paper)
Group 2 : group finished with diamond bur(medium grain)
Group 3 : group finished with carbide cross-cut tapered fissure bur
Group 4 : group finished with wet pumice
Group 5 : group finished with dentin conditioner(25% polyacrylic acid) for 10 seconds
The dentin surface roughness(Rmax ; §­) after finishing procedures was measured by
a surface roughness tester and the tensile bond strength (Kg. f/cm2) after
cementation was measured by a universal testing machine. Then, the dentin surfaces
after dentin finishing procedures and the fractured dentin surfaces were examined with a
scanning electron microscope. The results of this study were as follow :
On the dentin surfaces after finishing procedures, the grinding grooves and the smear
layer were the most prominent in the diamond bur group. The surface was the
smoothest and also the smear layer was the least prominent in the pumice group.
The surface roughness value was the highest in the diamond bur group, next came the
carbide bur group, dentin conditioner group, control group and the lower in the pumice
group(f=104.29, p<0.001). There were not statistical differences between control and
dentin conditioner group, pumice and dentin conditioner group only(p<0.05).
The tensile bond strength was the highest in the pumic group, next came the dentin
conditioner group, control group, carbide bur group and the lowest in the diamond bur
group(f=18.65, p<0.001). In the pumice group significantly higher than the other groups
and also in the dentin conditioner group significantly higher than the diamond bur,
carbide bur group(p<0.05).
The smoother the dentin surface, the higher the bond strength. On the fractured dentin
surfaces, as the bond strength increased, the more cohesive fracture pattern was
examined.

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