【摘要】 目的:评估Haavikko法测定南京地区儿童自然年龄的适用性。方法:本研究收集了符合要求的南京市儿童的曲面断层片629张(其中男性392例,女性237例),按照Haavikko法对左下颌7颗恒牙发育分期进行判读,查表计算得出牙龄,将所得牙龄与自然年龄进行配对t检验,并建立南京地区儿童牙龄与自然年龄间关系的数学模型。结果:运用Haavikko法算得南京地区男童牙龄比自然年龄平均低估0.6年,女童牙龄比自然年龄平均低估1.0年,该差异有统计学意义(P<0.05)。建立南京地区儿童牙龄与自然年龄相关的数学模型,得到自然年龄与牙龄的拟合曲线方程。结论:基于Haavikko法研究并建立了南京市儿童的牙龄与自然年龄间关系的数学模型,其结果可用于对本地儿童牙龄及自然年龄的计算。更多还原

【Abstract】 Objective: To assess the applicability of Haavikko method in estimating the dental age of Nanjing children. Methods: A total of 629 dental panoramic radiographs( 392 boys and 237 girls) of children in Nanjing were collected for the study on the basis of predetermined inclusion and exclusion criteria. All permanent mandibular teeth on the left side of the radiograph( except for the third molars) were assessed,and the stages of development of these teeth were recorded according to Haavikko method. Paired t-test was performed between the chronological age and dental age which was scored by Haavikko method. A single-factor model was used to show the relationship between chronological age and dental age of Nanjing children. Results: A statistically significant difference was found between chronological age and dental age( P < 0. 01). Dental age scored by Haavikko method showed an underestimate of 0. 6 years and 1. 0 years in males and females. We set up the mathematical model between dental age and chronological age,then got the curvefitting equation. Conclusions: The curve-fitting equation can be used to assess chronological age of Nanjing children,because it shows no statistically significant difference between natural and dental age by using the equation.更多还原