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HISTOLOGIC CHANGES OF THE INFERIOR ALVEOLAR NERVE ACCORDING TO THE AMOUNT OF THE MANDIBULAR LENGTHENING IN RABBITS

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Abstract

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À» ½ÃÇàÇÏ°í 7ÀÏ°£ÀÇ ÀáÀç±â¸¦ ÁØ´ÙÀ½, 10ÀÏ µ¿¾È 0,36 mm/day, 0.72 mm/day, 1 mm/day¾¿
½Å¿¬ÇØ ÁÖ¾ú´Ù. À̶§ ÇÇÁú°ñÀý´Ü¼úÀ̳ª ½Å¿¬À» ½ÃÇàÇÏÁö ¾ÊÀº °ÍÀ» ´ëÁ¶±ºÀ¸·Î ÇÏ¿´´Ù. ½Å¿¬
ÈÄ 14ÀÏ°£ °æÈ­µÇµµ·Ï ÇÑ ´ÙÀ½ À°¾ÈÀû ¹× Á¶Á÷ÇÐÀûÀ¸·Î °üÂûÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú
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1. ´ëÁ¶±º : ÇÏÄ¡Á¶½Å°æ¿¡¼­ º¼ ¼ö ÀÖ´Â 3°³ÀÇ ½Å°æ¼ÓÀÌ Á¸ÀçÇÏ¿´´Ù. ½Å°æ¿Ü¸·, ½Å°æÁÖÀ§¸·,
½Å°æ³»¸·ÀÌ Á¤»óÀûÀ¸·Î °üÂûµÇ¾ú°í ³»ºÎ¿¡ ¸íÈ®ÇÑ ¼öÃʸ¦ °®´Â Ãà»èÀÌ º¸¿´´Ù.
2. 0.36 mm/day ½Å¿¬±º : ´ëÁ¶±º°ú À¯»çÇÑ 3°³ÀÇ ½Å°æ¼ÓÀÌ Á¸ÀçÇÏ¿´´Ù. ½Å°æ¿Ü¸·, ½Å°æÁÖÀ§
¸·, ½Å°æ³»¸·ÀÇ Æı«´Â º¸ÀÌÁö ¾Ê¾ÒÀ¸³ª ½Å°æ³»¸· ³»ÀÇ ¸î¸î ½Å°æ¼¶À¯¿¡¼­ ¼öÃÊ °¨¼Ò, Ãà»è
ÇüÁúÀÇ ºÎÁ¾ ¹× ¾ÏÈ­ÀÇ ¼Ò°ßÀÌ °üÂûµÇ¾ú´Ù.
3. 0.72 mm/day ½Å¿¬±º : ½Å°æ¿Ü¸·, ½Å°æÁÖÀ§¸·ÀÇ ±¸ºÐÀº °¡´ÉÇÏ¿´À¸³ª Á¤»óÀûÀÎ 2°³ÀÇ ½Å
°æ¼Ó°ú 1°³ÀÇ ¼Õ»óµÈ ½Å°æ¼ÓÀÌ ½Å°æÁÖÀ§¸·ÀÇ ºÎºÐÀûÀÎ Æı«¿Í ÇÔ²² °üÂûµÇ¾ú´Ù Ãà»èÀÇ ÀϺÎ
´Â Á¤»ó°ú À¯»çÇϳª ´ëºÎºÐ¿¡¼­ Ãà»è ÇüÁúÀÇ ºÎÁ¾ ¹× ¾ÏÈ­ÀÇ ¼Ò°ßÀ» º¸¿´´Ù.
4. 1 mm/day½Å¿¬±º : ½Å°æ¼¶À¯ÀÇ ºÐ»ê¿¡ ÀÇÇØ ½Å°æ¼ÓÀ» ±¸ºÐ ÇÒ ¼ö ¾ø¾úÀ¸¸ç ½Å°æ¿Ü¸· ½Å
°æÁÖÀ§¸·, ½Å°æ³»¸·µµ ±¸ºÐÇÒ ¼ö ¾ø¾ú´Ù. ´ëºÎºÐÀÇ Ãà»èÀº Æı«µÇ°í ¼Ò¼ö ³²¾Æ ÀÖ´Â Ãà»èÀÇ
Å©±âµµ °¨¼ÒµÇ°í ¸ð¾çÀÇ º¯È­°¡ ½ÉÇÏ¿´´Ù. À̵é ÁÖÀ§¿¡¼­´Â ¿ÜºÎ¿¡¼­ ±â¿øÇÑ ±³¿øÁú ±âÁúÀÌ
°üÂûµÇ¾ú´Ù.
ÀÌ»óÀÇ °á°ú´Â ½Å¿¬ °ñÇü¼º½Ã ½Å¿¬ ¾çÀÌ Áõ°¡ÇÒ¼ö·Ï ½Å°æ¼Ó, ½Å°æ¸· ¹× Ãà»èÀÇ ¼Õ»óÀÌ ½É
ÇØÁö¹Ç·Î ½Å¿¬ °ñÇü¼ºÀ» À§ÇÑ ÇϾǰñ ½Å¿¬½Ã¿¡´Â ÀûÀýÇÑ ½Å¿¬ ¾çÀ» ¼±ÅÃÇϴµ¥ ÁÖÀÇ°¡ ¿ä¸Á
µÊÀ» ½Ã»çÇÏ¿´´Ù.
#ÃÊ·Ï#
The purpose of this study was to evaluate the histologic change of the inferior
alveolar nerve according to distraction amount following mandibular lengthening. Seven
rabbits weighing about 2 §¸ were used. Corticotomy was performed on the mandibular
body anterior to the fight first premolar region and unilateral external fixation device
was placed. Every effort was made to preserve the inferior alveolar nerve during the
corticotomy. The rabbits were then allowed to heal for 7 days without distraction of the
device. The mandible was lengthened 0.36 §®/day, 0.76§®/day. or 1.0§®/day. Corticotomy
and lengthening of mandible were not performed in control group. After the completion
of the lengthening process, a 14-day-consolidation period was allowed. After
consolidation, rabbits were sacrificed, and histologic examination of the inferior alveolar
nerve was performed. The results obtained were as follows:
1. In the control group, normal trifascicular pattern of inferior alveolar nerve was
observed. Epineurium, perineurium, endoneurium, and axon with myelin sheath were
observed in normal appearance.
2. In 0.36 §®/day distraction group, the trifascicular pattern was normally shown, and
there was no destruction in epineurium, perineurium, and endoneurium, The mild
changes including myelin attenuation, axoplasmic swelling and darkening were observed.
3. In 0.72 §®/day distraction group, it was possible to differentiate the epineurium from
the perineurium. Two normal fascisles and one injuried fascisle were observed with a
partially destructed perineurium. Most of the axons had axoplasmic swelling and
darkening.
4. In 1 mm/day distraction group, it was difficult to differentiate the nerve structures
such as fascicles, epineurium, perineurium, and endoneurium. The axons were severely
destroyed, except few which showed decreass in size and changes in shape. Some
collagen matrices were observed around the axons.
These results suggest that the higher the distraction amount, the more sever the
injury to the inferior alveolar nerve, fascicles, axons. Although distraction osteogenesis
may be useful, the amount of distraction should be carefully selected.

Å°¿öµå

Inferior alveolar nerve; Mandibular lengthening;

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