牙齿隐裂与折裂的本征因素初步分析

目的研究隐裂牙与折裂牙的微观结构特点与发病的内在联系,为隐裂牙预防和临床诊疗提供参考依据。方法以折裂拔除的成人磨牙作为研究对象,利用X射线衍射、扫描电子显微镜和红外反射光谱仪方法,对牙釉质和牙本质的微观结构和形貌分别进行观察和比较分析。结果牙本质与牙釉质的化学成分和晶体结构是一致的,主要组成为羟基磷灰石。但牙本质羟基磷灰石结晶颗粒取向分布比较均匀,且尺寸较小,约为几纳米,而牙釉质羟基磷灰石结晶颗粒高度择优取向,颗粒呈线状,线长度达近百纳米。牙齿裂纹可以出现在牙釉质,也可以出现在牙本质。牙本质中有较高的水含量。结论牙齿隐裂可以出现在牙齿表面,也可以出现在牙齿内部。牙齿隐裂和折裂的直接原因是作用在牙齿上的力,但冷热食物的剧烈刺激,也可以导致牙釉质或牙本质首先出现裂纹。而由牙本质出现的牙齿隐裂,比较难以发现和开展早期治疗,需要特别注意。

Intrinsic characteristics of cracked teeth

Aim To study the relationship between the structural characteristics and the incidence of cracked tooth,and to provide reference for the prevention and clinical diagnosis and treatment of the cracked tooth.Methods The cracked teeth with different positions were chosen and investigated by x-ray diffraction,scanning electron microscope,and fourier transform infrared spectrometer.The microstructural characteristics and morphologies of the dentin and the enamel were compared and discussed.Results The dentin and...