釉质表面正常结构的观察对于认识初期釉质龋的病理改变具有重要意义。以往文献中,对釉质表面结构的研究多限于磨片的光镜观察,最近,有作者以扫描电镜技术对初期釉质龋的表面结构作了描述,但有关正常釉质表面的扫描电镜研究报导较少。萌出牙釉质表面暴露于口腔环境,常有微生物及其产物沉积,加之生理性磨耗和病理性磨损,故对萌出牙表面结构的研究很难反应其真实的表面形态,本文采用人未萌第三磨牙,观察其成熟釉质表面的超微结 The observation of the normal structure of the enamel surface is of great significance for understanding the pathological changes of the early enamel caries. In the past literature, the study of enamel surface structure is mostly limited to the light microscopic observation of the disc. Recently, some authors described the surface structure of the initial enamel caries by scanning electron microscopy, but there are few reports of SEM on the normal enamel surface . Enamel surface eruption exposed to the oral environment, often microbial and its product deposition, combined with physiological wear and pathological wear, so the eruption of the tooth surface structure of the study is difficult to reflect the true surface morphology, Molar to observe the ultrastructure of mature enamel surface