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A study on enamel thickness of maxillary incisors using X-ray micro computed tomography

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Á¶¿µ¿ø, Á¶ÁøÇö, À̱Ժ¹,
¼Ò¼Ó »ó¼¼Á¤º¸
Á¶¿µ¿ø ( Cho Young-Won ) - °æºÏ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Ã¶Çб³½Ç
Á¶ÁøÇö ( Cho Jin-Hyun ) - °æºÏ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Ã¶Çб³½Ç
À̱Ժ¹ ( Lee Kyu-Bok ) - °æºÏ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Ã¶Çб³½Ç

Abstract

¿¬±¸¸ñÀû: À̹ø ¿¬±¸ÀÇ ¸ñÀûÀº ¹ý¶ûÁú µÎ²²¸¦ ÃøÁ¤Çϴµ¥ ÀÖ¾î microCTÀÇ Á¤È®¼ºÀ» Æò°¡ÇÏ°í, Çѱ¹ÀÎÀÇ »ó¾ÇÀüÄ¡ ¹ý¶ûÁú µÎ²²¸¦ ¾Ë¾Æº½À¸·Î½á ÀÓ»ó¿¡ µµ¿òÀ» ÁÖ°íÀÚ ÇÑ´Ù.

¿¬±¸Àç·á ¹× ¹æ¹ý: ¹ß°ÅµÈ »ó¾Ç ÁßÀýÄ¡ 5°³¸¦ ·¹Áø Æ÷¸ÅÇÏ¿© Ä¡¾Æ ÀåÃàÀ» µû¶ó Á¤Áߺο¡¼­ Çù¼³·Î Àý´ÜÇÏ°í ¿¬¸¶ÇÑ ÈÄ¿¡ microCT¸¦ ÃÔ¿µÇÏ¿© scanning electron microscope »ó(¡¿ 20)¿¡¼­¿Í microCT »ó¿¡¼­ °ÅÀÇ µ¿ÀÏÇÑ Àý´Ü¸éÀ» ±¸ÇöÇÏ¿´°í, °¢°¢ ¹é¾Ç¹ý¶û°æ°è »ó¹æ 1, 3, 5 mm ºÎÀ§ÀÇ ÇùÃø ¹ý¶ûÁú µÎ²²¸¦ ÃøÁ¤ÇÏ¿© microCTÀÇ Á¤È®¼ºÀ» Æò°¡ÇÏ¿´´Ù. ¶ÇÇÑ »ó¾Ç ÁßÀýÄ¡ 26°³¿Í ÃøÀýÄ¡ 11°³¸¦ ÀÌ¿ëÇÏ¿© °¢ Ä¡¾ÆÀÇ ¼øÃø Á¤ÁßºÎ¿Í Á¤Áߺο¡¼­ ±Ù¿ø½ÉÀ¸·Î °¢°¢ 2 mm ¶³¾îÁø ¼±»ó¿¡¼­ ¹é¾Ç¹ý¶û°æ°èÀÇ »ó¹æ 1, 3, 5 mm ÁöÁ¡ÀÇ ¹ý¶ûÁú µÎ²²¸¦ ÃøÁ¤ÇÏ¿´´Ù. Á¤ÁߺÎÀÇ ¼¼ ÁöÁ¡¿¡¼­´Â Á¤Áߺθ¦ Áö³ª´Â ½Ã»ó¸é¿¡¼­ ¹ý¶ûÁú Ç¥¸é¿¡ Á¢¼±À» ±×¾î ÀÌ Á¢¼±¿¡ ¼öÁ÷À¸·Î ¹ý¶û»ó¾Æ°æ°è±îÁö ¼ö¼±À» ³»·Á ¹ý¶ûÁú µÎ²²¸¦ ÃøÁ¤ÇÏ¿´°í, ±Ù¿ø½É 2 mm¸¦ Áö³ª´Â ¼±»ó¿¡ ÀÖ´Â 6°³ ÁöÁ¡¿¡¼­´Â °¢ ÁöÁ¡À» Áö³ª´Â ¼öÆò¸é¿¡¼­ ¹ý¶ûÁú Ç¥¸é¿¡ Á¢¼±À» ±×¾î ÀÌ Á¢¼±¿¡ ¼öÁ÷À¸·Î ¹ý¶û»ó¾Æ°æ°è±îÁö ¼ö¼±À» ³»·Á ¹ý¶ûÁú µÎ²²¸¦ ÃøÁ¤ÇÏ¿´´Ù.

°á°ú: µ¿ÀÏÇÑ Àý´Ü¸é¿¡¼­ ÁÖ»çÀüÀÚÇö¹Ì°æ°ú microCT¸¦ ÀÌ¿ëÇÏ¿© ¹é¾Ç¹ý¶û°æ°è »ó¹æ 1, 3, 5 mm ÁöÁ¡ÀÇ ¼ø¸é ¹ý¶ûÁú µÎ²²¸¦ ÃøÁ¤ÇÑ °ªÀº Æò±Õ 3.81% Â÷ÀÌ°¡ ³µÀ¸³ª, independentt-test °á°ú µÎ °¡Áö ¹æ¹ý¿¡ ÀÇÇÑ ÃøÁ¤°ªÀº Åë°èÀûÀ¸·Î À¯ÀÇÇÑ Â÷ÀÌ°¡ ¾ø¾ú´Ù. »ó¾Ç ÁßÀýÄ¡ÀÇ Á¤Áߺο¡¼­ ¹é¾Ç¹ý¶û°æ°è 1, 3, 5 mm »ó¹æÀÇ ¼ø¸é ¹ý¶ûÁú µÎ²²´Â °¢°¢ 0.32 ¡¾0.01, 0.50 ¡¾ 0.02, 0.70 ¡¾ 0.02 mm·Î ³ªÅ¸³µ´Ù. »ó¾Ç ÃøÀýÄ¡ÀÇ Á¤Áߺο¡¼­ ¹é¾Ç¹ý¶û°æ°è 1, 3, 5 mm »ó¹æÀÇ ¼ø¸é ¹ý¶ûÁú µÎ²²´Â °¢°¢ 0.30 ¡¾ 0.01, 0.55 ¡¾ 0.03, 0.80 ¡¾ 0.02 mm·Î³ªÅ¸³µ´Ù.

°á·Ð: ¹ý¶ûÁú µÎ²²¸¦ ÃøÁ¤Çϴµ¥ ÀÖ¾î microCT´Â À¯¿ëÇÑ ÃøÁ¤¹æ¹ýÀÇ ÇϳªÀ̸ç, À̹ø ¿¬±¸ÀÇ °á°ú·Î º¼ ¶§ Çѱ¹ÀÎÀÇ »ó¾ÇÀüÄ¡ºÎ µµÀç ¶ó¹Ì³×ÀÌÆ® ¼öº¹½Ã ¹ý¶ûÁúÀÇ »èÁ¦·®
¿¡ ÁÖÀǸ¦ ±â¿ïÀÏ ÇÊ¿ä°¡ ÀÖ´Â °ÍÀ¸·Î »ç·áµÈ´Ù.

Purpose: The objectives of the current study are to assess the accuracy of X-Ray Micro Computed Tomography (microCT) in measuring enamel thickness and to evaluate enamel thickness in maxillary incisors of Koreans.

Material and Methods : Five maxillary incisors were embedded in resin block. These teeth were longitudinally sectioned labiolingually through the medial axis. After polishing, the teeth were scanned using a microCT (X-EYE SYSTEM; DRGEM, Seoul, Korea). On a scanning electron microscope (S-4300; Hitachi, Tokyo, Japan) (¡¿20) and a microCT, nearly identical planes were reconstructed. In each tooth, the thickness of labial enamel was measured 1, 3 and 5 mm above the cementoenamel junction (CEJ). Thus, the accuracy of the microCT was evaluated. In addition, using 26 maxillary central incisors and 11 maxillary lateral incisors, in the medial axis and 2 mm remote areas mesially and distally from the medial axis, the thickness of labial enamel was measured 1, 3 and 5 mm above the CEJ along the long axis of the teeth

Results: Measurements from nearly identical planes in physical and microCT sections differed by 3.81%. An independent t-test was performed and this showed that there were no significant differences in the measurements between the two methods. Mean values of labial enamel thickness in maxillary central incisors 1, 3 and 5 mm above the CEJ were 0.32 ¡¾ 0.01, 0.50 ¡¾ 0.02 and 0.70 ¡¾ 0.02 mm, respectively. Mean values of labial enamel thickness in maxillary lateral incisors 1, 3 and 5 mm above the CEJ were 0.30 ¡¾ 0.01, 0.55 ¡¾ 0.03 and 0.80 ¡¾ 0.02 mm, respectively.

Conclusion: In measuring enamel thickness, microCT is one of useful way of measurement. So according to the results of this research, when restoring a porcelain laminate veneer on maxillary incisors in Koreans, careful consideration is needed in the amount of enamel reduction.

Å°¿öµå

¹ý¶ûÁú µÎ²²; MicroCT; ÁÖ»çÀüÀÚÇö¹Ì°æ; ¹é¾Ç¹ý¶û°æ°è; µµÀç ¶ó¹Ì³×ÀÌÆ®
Enamel thickness; MicroCT (X-Ray Micro Computed Tomography); Scanning Electron Microscopy; Cementoenamel junction; Porcelain laminate veneer

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KCI
KoreaMed