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EFFECT OF SURFACE TREATMENT AND THERMOCYCLING ON THE SHEAR BOND STRENGTH OF REPAIRED POSTER10R HYBRID COMPOSITE RESINS

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Abstract

°á·Ð
±¸Ä¡¿ë °­È­Ç× ÄÞÆ÷ÁþÆ®·¹Áø ¼öº¹¹°¿¡¼­ ¸¶¸ð, ÆÄÀý ¹× º¯»ö µîÀ¸·Î ¼ö¸®¸¦ ¿äÇÏ´Â °æ¿ì
¹Ì¼¼ÇÑ ±â°èÀû À¯ÁöÇüŸ¦ Çü¼ºÇÏ°í ´Ù¸ñÀû Ä¡°ú¿ë Á¢ÂøÁ¦¸¦ »ç¿ëÇÑ´Ù. ¹Ì¼¼±â°èÀû À¯ÁöÇü
Ÿ¦ Çü¼ºÇϱâ À§ÇÏ¿©´Â »÷µåºí¶ó½ºÆÃ, ¸¶¼â ¹× »êºÎ½Ä¹ý µîÀÌ Àִµ¥ »êºÎ½Ä¹ýÀÇ °æ¿ì, ÀÎ
»êÀº È¿°ú°¡ ¾ø°í ºÒ»êÀº ÄÞÆ÷ÁþÆ®·¹Áø¿¡ µû¶ó Â÷ÀÌ°¡ ÀÖ´Ù. ÇöÀç´Â »÷µåºí¶ó½ºÆÃÇÑ ÈÄ ¹«
ÃæÀü Á¢Âø¿ë ·¹ÁøÀ» »ç¿ëÇÏ´Â ¹æ¹ýÀÌ È¿°úÀûÀΠ󸮷Π¾Ë·ÁÁ®ÀÖ´Ù.
º» ½ÇÇèÀº 3 Á¾ÀÇ ÄÞÆ÷ÁþÆ®·¹Áø (Charisma, Aelitefil, Z-100) À» Àç·á·Î ½ÃÆíÀ» Á¦ÀÛÇÑ ÈÄ
¿¬¼Ó ÀûÃþ°ú ±¸º°Çϱâ À§ÇÏ¿© 5¡É¡­55¡É¿¡¼­ 1,000 ȸ ¿­¼øȯ ó¸®ÇÏ°í, ´Ù¸ñÀû Ä¡°ú¿ë Á¢Âø
Á¦, ½Ç¶õ Àüó¸®Á¦, »÷µåºí¶ó½ºÆÃ, ¸¶¼â µî Ç¥¸é󸮿¡ µû¶ó 8 °³ ½ÇÇ豺À¸·Î ºÐ·ùÇÏ¿´´Ù. ¿©
·¯ ¹æ¹ýÀ¸·Î Ç¥¸éÀ» ó¸®ÇÑ ÈÄ Z-100 À¸·Î ¼ö¸®ÇÏ°í °¢ ½ÇÇ豺´ç 5°³ ¼ö¸® ½ÃÆíÀ» 37¡É Áõ
·ù¼ö¿¡ 24 ½Ã°£ ħÀûÇÏ°í, 5°³ ½ÃÆíÀº 5¡É¡­55¡É¿¡¼­ 600ȸ ¿­¼øȯÀ» Ãß°¡ÇÑ ÈÄ ÀνºÆ®·Ð
½ÃÇè±â¿¡¼­ 1 §®/minÀÇ ¼Óµµ·Î ÇÏÁßÀ» °¡¾ÐÇÏ¿© Àü´Ü°áÇÕ°­µµ¸¦ ÃøÁ¤ÇÑ ¹Ù ´ÙÀ½°ú °°Àº °á
·ÐÀ» ¾ò¾ú´Ù.
1. »÷µåºí¶ó½ºÆø¸À» ÇÑ °æ¿ì Àü´Ü°áÇÕ°­µµ´Â À¯ÀÇÇÏ°Ô Áõ°¡ÇÏ¿´À¸³ª (p<0.05) ¸¶¼â¸¸À»
ÇÑ ±ºÀº À¯ÀÇÇÏ°Ô Áõ°¡ÇÏÁö ¾Ê¾Ò°í (p>0.05) ´Ù¸ñÀû Ä¡°ú¿ë Á¢ÂøÁ¦¸¦ µµÆ÷ÇÏ¿´À» ¶§ À¯ÀÇÇÏ
°Ô Áõ°¡ÇÏ¿´´Ù (p<0.05).
2. »÷µåºí¶ó½ºÆà ÈÄ ´Ù¸ñÀû Ä¡°ú¿ë Á¢ÂøÁ¦¸¦ µµÆ÷ÇÑ ±º°ú ¸¶¼âÇÏ°í ´Ù¸ñÀû Ä¡°ú¿ë Á¢ÂøÁ¦
¸¦ µµÆ÷ÇÑ ±º¿¡¼­ ½Ç¶õ Àüó¸®Á¦¸¦ »ç¿ëÇÑ °æ¿ì Àü´Ü°áÇÕ°­µµ´Â Áõ°¡ÇÏ¿´À¸³ª À¯ÀǼºÀº º¼
¼ö ¾ø¾ú´Ù (p>0.05).
3. ´Ù¸ñÀû Ä¡°ú¿ë Á¢ÂøÁ¦¸¦ µµÆ÷ÇÑ °æ ¿ì 400 grit·Î ¸¶¼âÇÑ ±º°ú »÷µåºí¶ó½ºÆÃÇÑ ±º¿¡¼­
Àü´Ü °áÇÕ°­µµ´Â À¯ÀÇÇÑ Â÷À̸¦ º¼ ¼ö ¾ø¾ú´Ù (p>0.05).
4. ÄÞÆ÷ÁþÆ® ·¹ÁøÀ» Á¢ÂøÇÑ ÈÄ 600 ȸ ¿­¼øȯÇÑ °æ¿ì Àü´Ü°áÇÕ°­µµ´Â À¯ÀÇÇÑ º¯È­¸¦ º¼
¼ö ¾ø¾ú´Ù (p>0.05).
#ÃÊ·Ï#
Despite significant improvement in the mechanical properties of composite resins, They
still undergo wear, discoloration, fracture with time. Repair is an alternative to the total
replacement of old composite resin restoration, because it reduces pulpal trauma, and
cost, time. The successful bond strength between new and old composite usually
requires micromechanical retention and coating of old composite with unfilled resin.
Micromechanical retention can be achieved by sandblasting, grinding, or acid etching.
Now application of bonding agent after sandblasting is known as the most erective
surface treatment for composite repair. The aim of this study is to compare sandblasting
with grinding as micromechanical roughening method and to evaluate the effect of
bonding agents silane primer, and post-cure thermocycling on shear bond strength of
repaired posterior composite resins.
The three posterior composite rosins were used in this study. Charisma, Aelitefil, and
Z-100 were for substrate resin and only Z-100 for repair resin. Then they were
thermocycled (5¡­55¡É, 1,000 cycles) for aging. The substrate surface was treated by
various methods : 1 group-NT (no treatment), 2 group-BA (bonding agent ; Scotchbond
MP), 3 group-SB (sandblasting with 50 §­ alumina particles), 4 group-GR (400 grit Sic
grinding), 5 group-SB+BA, 6 group-GR+BA, 7 group-SB+PR (primer ;
Scotchprime-ceramic primer) +BA, 8 group-GR£«PR£«BA. After specimens were repaired
by 8 different methods, then 5 specimens for each group were immersed in 37¡É
deionized water for 24 hours and the other 5 specimens were thermocycled again (5¡­55
¡É, 600 cycles). The shear bond strength was measured by Instron testing machine with
1.0 mm/min. cross-head speed.
From the experiment, the following results were obtained :
1. Shear bond strength of sandblasted group was significantly higher (p<0.05) than
that of control group, but there was no significant difference (p>0.05) of bond strength
between ground group and control group. However application of bonding agent after
grinding significantly (p<0.05) increase the bond strength of contort group.
2. Although the values of shear bond strength of silane-primed groups were higher
than those of unprimed groups, there was no significancy (p>0.05)
3. When bonding agent has been applicated, there was no statistically significant
difference between sandblasted group and ground group (p>0.05).
4. No statistically significant difference of shear bond strength was made by
thermocyling(5¡­55¡É, 600 cycles).

Å°¿öµå

shear bond strength; sandblasting; grinding; silane primer; thermocycling;

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