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TREATMENT OF ANTERIOR CROSSBITE IN MIXED DENTITION USING MAXILLARY PROTRACTION APPLIANCE : A CASE REPORT

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Abstract

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1. º» Áõ·Ê¿¡¼­ »ó¾Ç°ñÀÇ Àü¹æÀ̵¿, ÇϾǰñÀÇ ÈÄÇϹæȸÀüÀ¸·Î ÀÎÇØ ÀüÄ¡ºÎ ¹Ý´ë±³ÇÕÀÌ ÇØ
¼ÒµÇ¾ú°í µ¿½Ã¿¡ Àü¾È¸é °í°æÀÌ Áõ°¡µÇ¾ú´Ù.
2. ȯÀÚÀÇ ³ªÀÌ°¡ ¸¹¾ÆÁú¼ö·Ï °ñ°Ý¼º º¯È­º¸´Ù´Â Ä¡¼ºº¯È­·®ÀÌ ¸¹¾Ò´Ù.
3. º» Áõ·Ê¿¡¼­ 500gmÀÇ ÈûÀ» ¾çÂÊ¿¡ Àû¿ëÇÑ °á°ú ´Ù¸¥ ¹®Çå¿¡ ¼Ò°³µÈ ¹Ù ÀÖ´Â Ä¡·á±â°£
º¸´Ù Ä¡·á±â°£ÀÌ ´ÜÃàµÇ¾ú´Ù.
4. »ó¾Ç Á¦1À¯±¸Ä¡¿Í °ßÄ¡»çÀÌ·Î ÈûÀ» Àû¿ëÇÑ °á°ú ±¸°³Æò¸éÀÇ º¯È­´Â ºñ±³Àû Àû¾ú´Ù.
#ÃÊ·Ï#
The prevalence of class ¥² malocclusion is approximately 5¡­9%, and about one fourth
of this malocclusion is due to underdeveloped maxilla. Maxillary protraction appliance is
an orthopedic device which promote the growth of a deficient maxilla by applying
extraoral force to actively growing patients. The object of using maxillary protraction
appliance is to guide a normal growth of maxilla and mandible and improve the occlusal
relationship and also improve the facial profile.
The author treated three patients whom were diagnosed as a class ¥² malocclusion
due to deficient maxilla using maxillary protraction appliance and the followings are the
conclusions :
1. In these cases, anterior crossbite was corrected by anterior movement of maxilla
and downward backward rotation of mandible and simultaneously, anterior facial height
was increased.
2. The amount of dental change compare to skeletal change was greater as the
patients got older.
3. When 500gm of force to each side was applied, the treatment period has been
decreased.
4. As a result of applying the force between maxillary first primary molar and canine,
there was a small degree of changes in palatal plane.
So, it can be concluded that the maxillary protraction appliance is effective in treating
growing patients with a deficient maxilla.

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