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A FINITE ELEMENT ANALYSIS OF EFFECT OF CHIN CAP APPLTANCE ON THE MANDIBLE AND TEMPOROMANDIBULAR JOINT IN CHILDREN

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Abstract

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1. ¹æÇâ A ·Î °ßÀνà ÀÎÀåÀÀ·ÂÀÌ ¿ì¼¼ÇÏ°Ô ³ªÅ¸³ª´Â ºÎÀ§´Â ÇϾǿÍÀÇ Áß°£ºÎ¿Í ÈĹæºÎ,
°úµÎÀÇ ÃÖ»óÁ¡, °üÀý¿ø°üÀÇ Àü¹æºÎ, Á¦1´ë±¸Ä¡ÀÇ ¿ù½É¸é ¹× ÇϾǰæºÎ¿Í °úµÎÈÄ ¹æºÎ¿¡ ºÐÆ÷
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¹æÇâÀÌ »ó¹æÀ¸·Î ÇâÇÒ¼ö·Ï Àü¹ÝÀûÀ¸·Î ÀÎÀåÀÀ·ÂÀÌ °¨¼ÒµÇ¾úÀ¸¸ç Á¦ 1´ë±¸Ä¡ºÎÀ§¿¡ ¾ÐÃàÀÀ·Â
ÀÌ ÁýÁߵǴ ¾ç»óÀ» ³ªÅ¸³½´Ù.
2. ¹æÇâ A ·Î °ßÀνà ¾ÐÃàÀÀ·ÂÀº S»óÀýÈçºÎ À§¿Í ÇϾǰæºÎ ¹× °úµÎÀÇ Àü¹æºÎ¸¦ µû¶ó ³Ð
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3. º¯À§´Â ÇϾÇüºÎÀÇ Àü¹æºÎ, ÇϾÇüÀÇ ÈÄ ¹æºÎ, °ü»óµ¹±âºÎ, ÇϾǰúµÎ, ÇϾǿÍÀÇ Áß°£°ú
ÈĹæºÎ¿¡¼­´Â ÈÄ»ó¹æÀ¸·Î ÇâÇϳª ÇϾÇÁö, ÇϾǿ찢ºÎ, °úµÎ°æºÎÀÇ Àü¹æ ±×¸®°í, ÇϾǿÍÀÇ Àü
¹æºÎ´Â ÈÄÇϹæÀ¸·Î ÇâÇÏ¿´´Ù. °ßÀιæÇâÀÌ »ó¹æÀ¸·Î ÇâÇÒ¼ö·Ï °ü»óµ¹±â, °úµÎ°æºÎÀÇ ÈĹæºÎÀ§
°¡ ÈÄÇϹæÀ¸·Î ÇâÇÏ¿´À¸¸ç ÇϾǰñÀÇ ÈĹæÀ̵¿ÀÌ °¨¼ÒÇÏ°í ÇϾǰñÀÇ Àü¹æºÎÀ§°¡ »ó¹æÀ¸·Î ÀÌ
µ¿ÇÏ´Â °æÇâÀÌ ÀÖÀ½ÀÌ °üÂûµÇ¾ú´Ù.
4. ¹æÇâ A·Î °ßÀνÿ¡ ÇϾÇü¿Í ÇÏÆÄÁö¿¡¼­´Â ÀÀ·ÂÀÌ Å©Áö¾ÊÀ¸¸ç Ä¡¹Ð°ñÀ» Áß½ÉÀ¸·Î ÀÀ
·ÂÀÌ ºÐÆ÷µÇ´Â ¾ç»óÀ» º¸À̳ª °ßÀÎ ¹æÇâÀÌ »ó¹æÀ¸·Î ÇâÇÒ¼ö·Ï Ä¡¾Æ ¹× ¿µ±¸Ä¡¹è¿¡ ÀÀ·ÂÀÌ
³Ð°Ô ºÐÆ÷µÇ´Â ¾ç»óÀ» º¸¿´´Ù.
#ÃÊ·Ï#
The purpose of this study was to investigate the stress distribution and displacement
in the mandible and temporomandibular joint during application of chin cap. The dry
skull of child in mixed dentition was used tc make a 2-dimensional finite element model.
It was composed of 765 elements and 1321 nodes.
An orthopedic forces, 500gm, was applied around the gnathion in three directions. The
directions of retraction had three planes : the first was the plane connecting from the
region of around the gnathion to condylion(A plane), the second was 20 degrees upward
from the first plane(B plane), the third was 50 degrees upward from the first plane(C
plane).
The results were as follows :
1. When the retraction was applied to A plane, the distribution of tensile stress was
greater on the middle and posterior portion of mandiular fossa, apex of condylar head,
anterior portion of articular disc, distal portion of first molar, posterior portion of
condylar neck and head. Particularly, it was concentrated on condylar head and neck. As
the retraction was dire cued more upward, it was decreased totally and concentrated on
the first molar.
2. When the retraction was applied te A plane, Compressive stress concentrated on
the sigmoid notch and anterior portion of condylar head and neck. As the retraction was
directed more upward, it moved from condylar head and neck toward anterior teeth
portion and it was concentrated on second premolar.
3. When the retraction was applied to A plane, displacement was directed to posterior
and superior in mandibular anterior body, mandibular posterior body, coronoid process,
condylar head, middle and posterior portion of mandibular fossa. But it was directed to
posterior and inferior in mandibular angle and ramus, anterior portion of condylar neck,
anterior porion of mandiblar fossa. As the retraction was directed more upward, it wss
directed ta posterior and inferior in coronoid process and posterior portion of condylar
neck. The posterior movement of mandible was decreased.
4. When the retraction was applied to A plane, the stress of mandibular body and
ramus was small and it was distributed on compact bone. As the retraction was
directed more upward, the stress was distributed widely on teeth and permanent teeth
germs.

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