Experimental study about osteotomy of mandibular outer cortex / 中华整形外科杂志
Chinese Journal of Plastic Surgery
;
(6): 426-429, 2008.
Article
in Chinese
| WPRIM
| ID: wpr-325828
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the change of morphology, biomechanics and histology after osteotomy of mandibular outer cortex.</p><p><b>METHODS</b>The mandibular outer cortex that involves angle and part of body was removed at one side in 8 minitype pigs aged 8-12 months. 2 pigs were selected randomly for histologic examination 12 weeks after operation. The other 6 animals were killed 24 weeks after operation. The thickness of new-formed mandibular outer cortex was measured and compared with that of operated side. Biomechanical test was performed in bilateral angles. Histological observation was made in the operated side.</p><p><b>RESULTS</b>The thickness of outer cortex was (2.1 +/- 0.3) mm and (2.5 +/- 0.4) mm in the operated side and opposite side, respectively, showing a significant difference between them (P < 0.01). The maximum load was (401.76 +/- 204.91) N and (585.42 +/- 413.07) N in the operated side and opposite side, respectively (P > 0.05). The Rigidity was (2172.19 +/- 1174.73) N/mm and (2363.90 +/- 1547.48) N/mm (P > 0.05). There was no statistical difference in biomechanics between the two sides. The histologic study showed histologically complete regeneration of outer cortex 24 weeks after mandibular outer cortex osteotomy.</p><p><b>CONCLUSIONS</b>After resection of mandibular outer cortex, the histologic restoration is complete, but the new-formed outer cortex is thinner with local depression. Bone tubercle can be seen at the angle after bone regeneration. There is no obvious change in biomechanics after outer cortex osteotomy.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Osteotomy
/
General Surgery
/
Swine
/
Swine, Miniature
/
Biomechanical Phenomena
/
Mandible
/
Methods
Limits:
Animals
Language:
Chinese
Journal:
Chinese Journal of Plastic Surgery
Year:
2008
Type:
Article
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