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- 2017
实验性牙周炎模型大鼠牙槽骨微结构的改变
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Abstract:
摘要 目的:研究牙周炎对大鼠根分叉区牙槽骨微结构的影响。方法:3月龄健康未孕大鼠14只,采用丝线结扎大鼠左侧上颌第一磨牙建立实验性牙周炎模型(实验组),右侧作为对照组。分别于建模后4周及8周时处死大鼠,并测量上颌磨牙牙周探诊深度、收集上颌骨标本。采用Micro-CT分析大鼠上颌第一磨牙根中1/3区牙槽骨微结构的改变。结果:4周及8周实验组牙周探针深度均高于对照组(P<0.05).Micro-CT图像分析发现对照组牙槽骨致密,主要由板状骨小梁构成;实验组牙槽骨变疏松,杆状骨小梁较多。牙槽骨微结构参数分析发现4周及8周实验组骨密度(BMD)、骨体积分数(BV/TV)及骨小梁宽度(Tb.Th.)均较对照组降低(P<0.05),且8周实验组BMD、BV/TV、Tb.Th.较4周组降低(P<0.05)。8周实验组骨小梁数目(Tb.N.)及骨髓腔宽度(Tb.Sp.)较对照组及4周实验组均增加(<0.05)。结论:牙周炎可导致大鼠根分叉区牙槽骨丢失、骨小梁微结构破坏,且这种破坏随着时间延长不断加剧
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