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KMID : 0360119920140010065
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Journal of the Korean Society of Maxillofacial Plastic Reconstructive Surgeons
1992 Volume.14 No. 1 p.65 ~ p.76
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An experimetal study on the change of condyle head after mandibular ramus oblique osteotomy
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Abstract
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This study was designed to observe the adaptive changes of mandibular condyles to displacement of mandibular condyle in adult animals.
In this study, 16 rabbits weighting about 3.5 kg was selected. Four rabbits were pr5eserved for control group and 8 animals were divided into 3 group, 2 weeks, 4 weeks and 8 weeks. the experimental animals were performed oblique osteotomy on both
mandibular ramus and internal wiring at mandibular border.
The experimental animals were sacrificed consecutively on the 2 weeks, 4 weeks and 8 weeks after oblique osteotomy and mandibular condyles were dissected out carefully to produced tissue specimen.
The specimens were fixed with 10% N formaline solution for 24 hours and rinsed with phosphate buffer solution. It was decalcified with 5% nitric acid for 15 days. Thereafter the specimens were dehydrated in alcohol series and embedded paraffin as
usual
manner. The mebedded specimen were sectioned in 4-6㎛ microtome, stained vith hematoxylin - osin and azan stain and observed through light microscope.
The following results were observed from this experiment.
When there was postional change of condyle head after mandibular ramus oblique osteotomy in adult rabbit.
1. The density of chondrocyte was generally increased at condylar cartilage and the thickness of condylar cartilage was increased posterosuperior aspect of the mandibular condyle slightly.
2. The density of chondrocyte was increased at proliferative zone so fibrous articular zone, porliferative zone and hypertrophic zone was clearly distinguished.
3. Active endochondral bone formation was occurred at mandibular condyle.
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