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Changes in occlusal force and occlusal contact area after orthodontic treatment

Korean Journal of Orthodontics 2010³â 40±Ç 3È£ p.176 ~ 183
ÃÖÀ±Á¤, Á¤ÁÖ·É, ±è°æÈ£,
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ÃÖÀ±Á¤ ( Choi Yoon-Jeong ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ ±³Á¤Çб³½Ç
Á¤ÁÖ·É ( Chung Choo-Ryung ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ ±¸°­°úÇבּ¸¼Ò
±è°æÈ£ ( Kim Kyung-Ho ) - ¿¬¼¼´ëÇб³ Ä¡°ú´ëÇÐ µÎ°³¾È¸é±âÇü ¿¬±¸¼Ò

Abstract

°íÁ¤½Ä ±³Á¤ÀåÄ¡¸¦ ÀÌ¿ëÇÑ ±³Á¤Ä¡·á ÈÄ ±³ÇÕÀÇ ±â´ÉÀû º¯È­¸¦ Æò°¡Çϱâ À§ÇØ, ±³ÇÕ·Â ¹× ±³ÇÕÁ¢Ã˸éÀûÀ» ÃøÁ¤ÇÏ¿© ´Ü±âÀûÀÎ º¯È­ ¾ç»óÀ» È®ÀÎÇÏ°í ¼Ò±¸Ä¡ ¹ßÄ¡ ¿©ºÎ¿¡ µû¸¥ Â÷À̸¦ ÆľÇÇÏ¿´´Ù. °íÁ¤½Ä ±³Á¤ÀåÄ¡·Î Ä¡·á¸¦ Á¾·áÇÑ 18¼¼ ¿¡¼­40¼¼ »çÀÌÀÇ ¼ºÀÎÀ» ³²ÀÚ±º°ú ¿©ÀÚ±ºÀ¸·Î ºÐ·ùÇÏ°í, °¢°¢ÀÇ ±ºÀ» 4°³ÀÇ ¼Ò±¸Ä¡¸¦ ¹ßÄ¡ÇÑ ±º°ú ºñ¹ßÄ¡·Î Ä¡·áÇÑ ±ºÀ¸·Î ¼¼ºÎ ºÐ·ùÇÏ¿´´Ù(³²ÀÚ¹ßÄ¡±º 16¸í, ³²ÀÚºñ¹ßÄ¡±º 18¸í, ¿©ÀÚ¹ßÄ¡±º 19¸í, ¿©ÀÚºñ¹ßÄ¡±º 21¸í). Dental prescalesystem (Fuji Film Corp., Tokyo, Japan)ÀÇ pressure sensitive sheet¸¦ 5ÃÊ°£ ÃÖ´ë±³µÎ°¨ÇÕÀ§¿¡¼­ ÃÖ´ë±Ù·ÂÀ¸·Î ±³ÇÕÇϵµ·Ï ÇÑ µÚ CCD camera¸¦ ÀÌ¿ëÇØ ±³Çշ°ú ±³ÇÕ¸éÀûÀ» ÃøÁ¤ÇÏ¿´´Ù. °íÁ¤½Ä ±³Á¤ÀåÄ¡¸¦ Á¦°ÅÇÏ°í °íÁ¤½ÄÀ¯ÁöÀåÄ¡¸¦ ºÙÀÎ Á÷ÈÄ, ±³Á¤ÀåÄ¡ Á¦°Å 1ÁÖÀÏ, 1°³¿ù, 3°³¿ù, 6°³¿ù, 1³â µÚ¿¡ °¢°¢ ÃøÁ¤ÇÏ¿© ºñ±³ÇÏ¿´´Ù. ¸ðµç ±º¿¡¼­ ±³Á¤ÀåÄ¡ Á¦°Å ÈÄ 1³â°£ÀÇ À¯Áö±â°£ µ¿¾È ±³Çշ°ú ±³ÇÕ¸éÀûÀº Á¡ÁøÀûÀ¸·Î Áõ°¡ÇÏ¿´´Ù (p £¼ 0.05). ¸ðµç ÃøÁ¤ ½Ã±â¿¡¼­ ³²ÀÚ±ºÀº ¿©ÀÚ±ºº¸´Ù ³ôÀº ±³Çշ°ú ±³ÇÕ¸éÀûÀ» º¸¿´À¸¸ç (p £¼ 0.05), ³²ÀÚ, ¿©ÀÚ±º ¸ðµÎ¿¡¼­ ¹ßÄ¡±º°ú ºñ¹ßÄ¡±º »çÀÌ¿¡´Â ±³ÇÕ·Â ¹× ±³ÇÕ¸éÀû¿¡¼­ Åë°èÀûÀ¸·Î À¯ÀÇÇÑ Â÷ÀÌ°¡ °üÂûµÇÁö ¾Ê¾Ò´Ù (p £¾ 0.05). º» ¿¬±¸¸¦ ÅëÇØ ±³Á¤Ä¡
·á ÈÄ 1³â°£ÀÇ À¯Áö±â°£ µ¿¾È ±³ÇÕÀÌ ±â´ÉÀûÀ¸·Î Çâ»óµÊÀ» ÆľÇÇÏ¿´°í, ¼Ò±¸Ä¡ ¹ßÄ¡·Î ÀÎÇÑ ±³ÇÕÀÇ ±â´ÉÀû ÀúÇÏ´Â
¾øÀ» °ÍÀ̶ó ÃßÃøÇÒ ¼ö ÀÖ¾ú´Ù.

Objective: This study was performed to evaluate functional changes of occlusion after orthodontic treatment by
measuring the occlusal force (OcFr) and occlusal contact area (OcAr), and to compare OcFr and OcAr change according to premolar extractions.

Methods: Data were obtained from 74 patients who had finished orthodontic treatment using fixed appliance aged between 18 and 40 years. Subjects were divided into groups who had four premolars extractions or non-extraction (Male extraction-16, Male nonextraction-18, Female extraction-19, Female nonextraction-21). All subjects were asked to bite pressure-sensitive sheets into maximum intercuspation with maximum bite force, and OcFr and OcAr were evaluated by measuring the sheet with a CCD camera. Records were taken right after debonding, 1 week, 1 month, 3 months, 6 months and 1 year after debonding.

Results: OcFr and OcAr increased gradually in all groups during the 1 year retention period (p £¼ 0.05). Male groups showed higher OcFr and OcAr than female groups throughout the retention periods (p £¼ 0.05). There were no
statistically significant differences of OcFr and OcAr between extraction and non-extraction groups in both males and females (p £¾ 0.05).

Conclusions: Occlusion was improved functionally throughout the 1 year retention, and premolar extraction did not induce a decline in the functional aspect of occlusion.

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Occlusal force;Occlusal contact area;Retention; Extraction vs;nonextraction

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