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Effect of cavity shape, bond quality and volume on dentin bond strength

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ÀÌÈ¿Áø/Lee HJ ±èÁ¾¼ø/À̽ÅÀç/ÀÓ¹ü¼ø/¹é½ÂÈ£/Á¶º´ÈÆ/Kim JS/Lee SJ/Lim BS/Baek SH/Cho BH

Abstract

º» ¿¬±¸¿¡¼­´Â º¹ÇÕ·¹ÁøÀÇ ÁßÇÕ¼öÃà½Ã ¿Íµ¿ÀÇ ÇüÅÂ, Á¢ÂøÃþÀÇ ¼º¼÷µµ, ¹× ¿Íµ¿ÀÇ ºÎÇÇ°¡ ¿Íµ¿ÀúÀÇ Á¢Âø¸é¿¡ ¹ß»ýµÇ´Â ÁßÇÕ¼öÃàÀÀ·Â¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» Æò°¡ÇÏ¿´´Ù. 1±Þ ¿Íµ¿ ÃæÀü½ÃÀÇ ÀÀ·Â¹ß»ýÀ» ¸ð¹æÇϱâ À§ÇØ, 98°³ÀÇ ´ë±¸Ä¡¸¦ $2\times2\times2$ ½ÇÇ豺¿¡ ¹«ÀÛÀ§·Î ºÐ¹èÇÏ°í ±³ÇÕ¸é »ó¾ÆÁúÀ» ÆòźÇÏ°Ô ¿¬¸¶ÇÑ ÈÄ, º¹ÇÕ·¹Áø ÃæÀüÀ» À§ÇÑ ¸ôµåÀÇ ¿ªÇÒÀ» ÇÒ ¼ö ÀÖ´Â ±¸¸ÛÀ» °¡Áø iris¸¦ ¿Ã·Á³õ°í º¹ÇÕ·¹ÁøÀ» bulk-filling¹ýÀ¸·Î ÃæÀüÇÏ¿´´Ù. °¢°¢ÀÇ º¯¼ö·Î¼­ ¿Íµ¿ ÇüÅ¿¡ °üÇÏ¿©´Â iris ÀçÁú (Á¢ÂøÁ¦¸¦ µµÆ÷ÇÑ »ó¾ÆÁú iris: ³ôÀº C-factor, Teflon ó¸®µÈ ±Ý¼Ó iris: ³·Àº C-factor), Á¢ÂøÃþÀÇ ¼º¼÷µµ¿¡ °üÇÏ¿©´Â 2Á¾ÀÇ Á¢ÂøÁ¦ (Scotchbond Multi-purpose¿Í Xeno III), ¿Íµ¿ÀÇ ºÎÇÇ¿¡ °üÇÏ¿©´Â iris³» ±¸¸ÛÀÇ Á÷°æ (Á÷°æ 1 ¶Ç´Â $3mm{\times}³ôÀÌ$) 5mm)À» ´Þ¸®ÇÏ¿© Àü´ÜÁ¢Âø°­µµ¸¦ ÃøÁ¤ÇÏ¿´´Ù ¿Íµ¿ÀÇ C-factor°¡ Ŭ¼ö·Ï, Á¢ÂøÃþÀÇ ¼º¼÷µµ°¡ ¿ì¼öÇÒ¼ö·Ï ±×¸®°í ºÎÇÇ°¡ Ŭ¼ö·Ï Á¢Âø·ÂÀº À¯ÀÇÇÏ°Ô °¨¼ÒÇÏ¿´´Ù. º¹ÇÕ·¹ÁøÀÌ ÁßÇÕµÉ ¶§, ¿Íµ¿ÀÇ ÇüÅÂÀû Á¦ÇÑ¿¡ µû¶ó ·¹Áø-»ó¾ÆÁú Á¢Âø°è¸é¿¡ ¹ß»ýµÇ´Â ÁßÇÕ¼öÃàÀÀ·ÂÀº Á¢ÂøÀÌ ¿ì¼öÇÒ¼ö·Ï º¹ÇÕ·¹ÁøÀÇ ºÎÇÇ°¡ Ŭ¼ö·Ï Áõ°¡µÇ¹Ç·Î, C-factor¸¦ Á¤ÀÇÇÒ ¶§ ¿Íµ¿ÀÇ ÇüÅÂ»Ó ¾Æ´Ï¶ó, Á¢ÂøÃþÀÇ ¼º¼÷µµ¿Í º¹ÇÕ·¹ÁøÀÇ ºÎÇǵµ ÇÔ²² °í·ÁµÇ¾î¾ß µÈ´Ù.

The aim of this study was to evaluate the effect of cavity shape, bond quality of bonding agent and volume of resin composite on shrinkage stress developed at the cavity floor. This was done by measuring the shear bond strength with respect to iris materials (cavity shape , adhesive-coated dentin as a high C-factor and Teflon-coated metal as a low C-factor), bonding agents (bond quality: $Scotchbond^{TM}$ Multi-purpose and Xeno III) and iris hole diameters (volume; 1mm or 3mm in $diameter{\times}1.5mm$ in thickness). Ninety-six molars were randomly divided into 8 groups ($2{\times}2{\times}2$ experimental setup). In order to simulate a Class I cavity, shear bond strength was measured on the flat occlusal dentin surface with irises. The iris hole was filled with Z250 restorative resin composite in a bulk-filling manner. The data was analyzed using three-way ANOVA and the Tukey test. Fracture mode analysis was also done When the cavity had high C-factor, good bond quality and large volume, the bond strength decreased significantly The volume of resin composite restricted within the well-bonded cavity walls is also be suggested to be included in the concept of C-factor, as well as the cavity shape and bond quality. Since the bond quality and volume can exaggerate the effect of cavity shape on the shrinkage stress developed at the resin-dentin bond, resin composites must be filled in a method, which minimizes the volume that can increase the C-factor.

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