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A Study Of Shear Bond Strength And Failure Patterns In Light-And Self-Cured Orthodontic Resin

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Abstract

°á·Ð
±¤ÁßÇÕÇü ·¹ÁøÁ¢ÂøÁ¦ÀÎ Lightbond bonding system(Reliance orthodontics, USA)°ú È­ÇÐÁß
ÇÕÇü ·¹ÁøÁ¢ÂøÁ¦ÀÎ Mono-Lok2 bonding system(Rocky-Mountain orthodontics, USA)À» ¼±
ÅÃÇÏ¿© °ÇÀüÇÑ Á¦1¼Ò±¸Ä¡°¡ ¸Å¸ôµÈ ·¹Áøºí·Ï»ó¿¡ ±Ý¼Óºê¶óÄÏÀ» Á¢ÂøÇÑ ÈÄ 37¡É, 100% »ó´ë
½Àµµ¿¡ 24½Ã°£ °æ°ú½ÃÅ°°í ¸¸´É¹°¼º ½ÃÇè±â¸¦ ÀÌ¿ëÇÏ¿© Àü´Þ°áÇÕ°­µµ¸¦ ÃøÁ¤ÇÏ°í, ÆÄÀý¾ç»ó
À» °üÂûÇÏ¿© ´ÙÀ½°ú °°Àº °á·ÐÀ» ¾ò¾ú´Ù.
1. Æò±Õ Àü´Ü°áÇÕ°­µµ°¡ ±¤ÁßÇÕÇü ·¹ÁøÁ¢ÂøÁ¦¿¡¼­ 240.90¡¾31.93 kg/cm2, È­ÇÐ
ÁßÇÕÇü ·¹ÁøÁ¢ÂøÁ¦¿¡¼­´Â 191.96¡¾39.27 kg/cm2·Î ±¤ÁßÇÕÇü ·¹ÁøÁ¢ÂøÁ¦¸¦ »ç
¿ëÇßÀ» ¶§°¡ Å©°Ô ³ªÅ¸³µ´Ù. (p<0.01).
2. ºê¶óÄÏ ÆÄÀý ¾ç»óÀº ±¤ÁßÇÕÇü ·¹ÁøÁ¢ÂøÁ¦¿¡¼­´Â ÁÖ·Î ¹ý¶ûÁú°ú Á¢ÂøÁ¦ °è¸éÀ̾ú°í, È­ÇÐ
ÁßÇÕÇü ·¹ÁøÁ¢ÂøÁ¦¿¡¼­´Â Á¢ÂøÁ¦ ³»ºÎÀÇ ÆÄÀýÀÌ ¸¹¾ÒÀ¸¸ç, µÎ ±º ¸ðµÎ ºê¶óÄÏ°ü Á¢ÂøÁ¦ °è
¸éÀÇ ÆÄÀýÀº °ÅÀÇ °üÂûµÇÁö ¾Ê¾Ò´Ù.
3. ¸ðµç ½ÃÆí¿¡¼­ ¹ý¶ûÁú ±Õ¿­(crack)Àº °üÂûµÇÁö ¾Ê¾Ò´Ù.
ÀÌ»óÀÇ °á°ú·Î º¼¶§ ±¤ÁßÇÕÇü ·¹ÁøÁ¢ÂøÁ¦¸¦ ÀÌ¿ëÇÑ ±Ý¼Ó ºê¶óÄÏÀÇ Á÷Á¢Á¢ÂøÀº ÀÓ»ó¿¡¼­ Ãæ
ºÐÈ÷ »ç¿ëµÉ ¼ö ÀÖÀ» °ÍÀ¸·Î »ç·áµÈ´Ù.
#ÃÊ·Ï#
Light-cured orthodontic composite resin has been widely advertised recently for use in
bonding brackets. However, the curability of light-cured resin when light waves are
diffused through metal brackets in questionable. The purposes of this study were to
evaluate shear bond strength and failure patterns of visible light-cured resin(Lightbond)
and chemically cured-resin(Mono-Lok 2), and determine the relative value of light-cured
resin as an alternative to conventional chemically cured resin. Each of the two resins
was tested on twenty extracted human first premolars Standard edgewise metal brackets
were bonded to the teeth in accordance with the manufacturers' recommendation. After
bonding, the teeth were stored for 24 hours at 37¡É, 100 humidity. The shear bond
strength was tested with a universal testing machine (Instron 4302) , at 0.5mm/min
crosshead speed. After debonding, brackets and enamel surfaces were examined with a
scanning electron microscope and a stereoscopic microscope. The results were as
follows :
1. Metal brackets bonded with Lightbond showed statistically higher shear bond strength
than metal brackets bonded with Mono-Lok2.
2. The predominant failure site in Lightbond was the enamel-resin interface, and in
Mono Lok 2 it was the resin itself.
3. Enamel cracks were not found in any specimen.
The above results suggest that direct bonding of metal brackets to enamel with
light-cured resin bonding agent can be used effectively in clinics.

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