32例乳牙牙本质光密度的测定与分析

Measurement and analysis of optical density in dentine of 32 primary teeth

目的:测定乳牙牙本质不同部位的光密度值,为乳牙基础研究提供基线资料。方法:用Digora数字化X线摄影系统测量32颗离体正常上颌乳中切牙牙本质不同深度(浅、中、深层)、不同轴面(近中、远中、唇侧、腭侧面)的光密度值,应用SAS6.12软件包进行单因素方差分析和SNK检验,比较不同部位光密度值的差异。结果:牙本质深层的光密度均值低于中层及浅层(P=0.002),牙本质4个轴面的光密度值无显著性差异(P=0.0997)。结论:光密度是1个间接反应牙体硬组织矿化程度的物理量,通过便捷的实验方法获得数字化信息,可为牙体硬组织的研究提供新的参考指标。

PURPOSE： To study the optical density （OD） of primary dental dentine and provide data for further research. METHODS： The Digora system of dental digital radiography was used to acquire digital radiographic images of cross sections from 32 deciduous maxillary central incisors, and to measure the OD values of different depth （outer, middle and inner layers） and four sides （mesial, distal, labial and palatal sides） in dentine. The difference was analyzed with one-way ANOVA and SNK using SAS 6.12 software package. RESULTS： The OD value of inner layer dentine was significantly lower than that of outer and middle layers （P=-0.002）, but there was no significant difference among four sides of dentine （P=0.0997）. CONCLUSIONS： OD value is an indirect physical quantity of dental mineralization, it provides a convenient digital indicator for the research of dental hard tissues.