Histological and morphological evaluation of condylar cartilage of young rats in response to stimulation of mandibular protrusion

Acta Scientiarum. Health Science Pub Date : 2017-08-22 DOI:10.4025/ACTASCIHEALTHSCI.V39I2.27789

Milena Peixoto Nogueira de Sá, A. L. Ramos, J. Zanoni, F. D. Souza, Daniele Esteves Pepelascov, R. Terada

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引用次数: 1

Abstract

The aim of this study was to evaluate the histogical and morphological aspects of the condyle in response to mandibular protrusion induced by composite resin occlusal planes. Thirty five-week-old male Wistar rats were selected and randomly divided in two groups. One group received a composite resin type of oclusal plane that induced mandibular protrusion, and the other was the control group, without treatment. Animals were euthanized after experimental time intervals of 7, 21 and 30 days. For histological analysis, thickness of the proliferative, serial and hypertrophic layers was measured, as well as each layer separately. The highest difference in cartilage thickness was observed at day 21, showing a significant increase of the proliferative layer. There were also other histomorphological changes related to occlusal plane interference. Condylar forward repositioning induced by composite occlusal planes influenced the endochondral ossification, increasing the proliferative layer.

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幼年大鼠髁突刺激后髁突软骨的组织学和形态学评价

本研究的目的是评估髁突在复合树脂咬合平面引起的下颌骨突出的组织学和形态学方面的反应。选取35周龄雄性Wistar大鼠，随机分为两组。一组采用复合树脂型咬合平面诱导下颌前突，另一组为对照组，不做任何治疗。实验时间间隔为7、21、30天，分别对动物实施安乐死。为进行组织学分析，分别测量增生性层、连续性层和肥厚层的厚度。第21天软骨厚度差异最大，增生层明显增加。还有其他与咬合面干扰有关的组织形态学改变。复合咬合平面诱导髁突前移位影响软骨内成骨，增生层增加。

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Acta Scientiarum. Health Science

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