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Comparison of the elastic modulus among three dentin adhesives before and after thermocycling
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ÀåÁÖÇý ( Chang Ju-Hea ) - ¼¿ï´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø
ÀÌÀκ¹ ( Lee In-Bog ) - ¼¿ï´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø
Á¶º´ÈÆ ( Cho Byung-Hoon ) - ¼¿ï´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø
±èÇý¿µ ( Kim Hye-Young ) - ¼¿ï´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø
¼ÕÈ£Çö ( Son Ho-Hyun ) - ¼¿ï´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø
KMID : 0362320080330010045
Abstract
º» ¿¬±¸´Â ÇöÀç ½ÃÆǵǰí ÀÖ´Â ¿©·¯ °³ÀÇ »ó¾ÆÁú Á¢ÂøÁ¦¸¦ ÀÓ»ó ¼ú½Ä¿¡¼¿Í °°Àº ¹æ¹ýÀ¸·Î »ç¿ëÇÑ ÈÄ ¿ ½Ãȿ󸮸¦ ÅëÇØ ³ëÈ °úÁ¤À» ÀçÇöÇÑ ´ÙÀ½ Á¢Âø °è¸éÀÇ Åº¼º°è¼ö¸¦ ÃøÁ¤ÇÔÀ¸·Î½á °¡¼öºÐÇØ¿¡ µû¸¥ ¹°¼ºº¯È¸¦ °üÂû ºñ±³ÇÏ°íÀÚ Çß´Ù. ¹ß°Å ÇÑ Áö 2 ÁÖÀÏ À̳»ÀÎ ¿µ±¸ ´ë±¸Ä¡ 21 °³ÀÇ »ó¾ÆÁú Ç¥¸éÀÌ ³ëÃâµÇµµ·Ï »èÁ¦ÇÏ¿´´Ù. °¢°¢ 7°³ÀÇ Ä¡¾Æ¿¡ ½ÃÆǵǰí ÀÖ´Â 3°¡Áö »ó¾ÆÁú Á¢ÂøÁ¦ (OptiBond FL, Clearfil SE, Xeno III)¸¦ Àû¿ëÇÑ µÚ ±¤ÁßÇÕ º¹ÇÕ ·¹Áø(Premisa, Kerr, Orange, CA, USA) ¸¦ 1 mm µÎ²²·Î ½×¾Æ ¿Ã·È´Ù. °¢ Ä¡¾Æ¸¦ À̵îºÐÇÏ¿© Àý¹Ý ½ÃÆíÀº 100,000ȸÀÇ ¿ ½ÃÈ¿ 󸮸¦ °¡Çϵµ·Ï Çß´Ù. Nanoindentation test¸¦ ÅëÇÏ¿© °¢ ½ÃÆíÀÇ adhesive layer¿Í hybrid layerÀÇ Åº¼º°è¼ö¸¦ ÃøÁ¤, ºñ±³ÇÏ¿´´Ù. ¿½ÃÈ¿ ó¸® ÈÄ Xeno III±ºÀÇ Åº¼º°è¼ö°¡ Åë°èÇÐÀûÀ¸·Î À¯ÀÇÇÒ ¸¸ÇÑ °¨¼Ò¸¦ º¸¿´´Ù (p < 0.05). Hydrophilic monomer¸¦ ¸¹ÀÌ ÇÔÀ¯ÇÑ one-step self-etch adhesive systemÀº ´Ù¸¥ Á¦Ç°¿¡ ºñÇØ °¡¼öºÐÇØ¿¡ Ãë¾àÇÏ¿© ÀÌ¿¡ µû¸¥ ¹°¼º º¯È¸¦ º¸ÀÌ´Â °ÍÀ¸·Î ÃßÁ¤µÇ¸ç, ±Ã±ØÀûÀ¸·Î ¼öº¹¹°ÀÇ ³»±¸¼º¿¡ ¿µÇâÀ» ¹ÌÄ¥ °ÍÀ¸·Î ¿©°ÜÁø´Ù.
The purpose of this study was to determine the effects on the elastic moduli of the adhesive and the hybrid layer from thermocycling. Twenty one human molars were used to create flat dentin surfaces. Each specimen was bonded with a light-cured composite using one of three commercial adhesives (OptiBond FL [OP], Clearfil SE Bond [CL], and Xeno III [XE]). These were sectioned into two halves and subsequently cut to yield 2-mm thickness specimens; one specimen for immediate bonding test without thermocycling and the other subjected to 10,000 times of thermocycling. Nanoindentation test was performed to measure the modulus of elasticity of the adhesive and the hybrid layer, respectively, using an atomic force microscope. After thermocycling, XE showed a significant decrease of the modulus in the adhesive layer (p < 0.05). Adhesives containing hydrophilic monomers are prone to hydrolytic degradation. It may result in the reduced modulus of elasticity, which leads to the mechanically weakened bonding interface.
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Adhesive layer;hybrid layer;hydrophilic monomer;modulus of elasticity;nanoindentation;thermocycling
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