牙龄推断的方法学研究

发布时间：2018-03-28 12:50

本文选题：法医牙科学　切入点：年龄测定　出处：《苏州大学》2009年硕士论文

【摘要】： 目的:探索中国(上海)青少年牙龄推断的科学、简便和实用方法。方法:参照国内外研究结果对Demirjian分级方法进行改良,制定新的分级方法。应用上述分级方法对2000年6月至2006年11月上海市第九人民医院符合纳入标准的11 ~20周岁汉族青少年501例(男性168例,女性333例)口腔曲面全景片进行研究,通过阅片、数据录入等工作,将数据导入SPSS15.0 for windows软件包,研究各恒牙在不同年龄段的级别分布情况,并据其分布情况制定出相应的牙龄推断影像学标准图谱,此外我们还对第三磨牙与左下颌七颗恒牙进行了牙龄推断的数学模型拟合。结果:1.用牙龄推断影像学标准图谱推断生活年龄时,男性组中除15周岁年龄段的推断误差在±1岁外,其余年龄段均为±2岁;女性组中13~16周岁推断牙龄的误差在±2岁,其余年龄段的推断误差为±1岁。通过检验样本回代后,图谱法推断的牙龄与生活年龄的T检验显示两者之间的差异无显著性,但准确率还有待于进一步提高。2.建立第三磨牙与左下颌七颗恒牙的牙龄推断数学模型,通过自身回代检验发现,当允许误差控制在±1岁时,其平均准确率达74.66%;而当允许误差在±1.5岁时,其平均准确率达89.37%。结论:1.所制定的牙龄影像学标准图谱适用于中国(上海)青少年的牙龄推断,但其误差较大,有待于进一步改进和完善。2.建立的牙龄推断数学模型可以与标准图谱一起使用,以增加牙龄推断的准确率。
[Abstract]:Objective: to explore a scientific, simple and practical method for estimating tooth age in Chinese (Shanghai) adolescents. Methods: according to the domestic and foreign research results, the method of Demirjian classification was improved. A new classification method was developed. From June 2000 to November 2006, 501 Han nationality adolescents (168 males and 333 females) who met the inclusion criteria in Shanghai Ninth people's Hospital were studied for panoramic images of oral surfaces. The data were imported into SPSS15.0 for windows software package to study the distribution of permanent teeth in different age groups by reading films and data input. According to the distribution, the imaging standard map of tooth age inference was established. In addition, the third molar and seven permanent teeth of left mandible were fitted with mathematical model of tooth age estimation. Results 1. When the age of life was inferred by the imaging standard atlas of tooth age, the inferential error of age in male group was 卤2 years old except for 15 years old, and in female group, that of 1316 years old was 卤2 years old, and that of female group was 卤2 years old, and that of male group was 卤2 years old, while that of female group was 卤2 years old. The extrapolation error of other age groups was 卤1 years old. The T test of tooth age and life age inferred by atlas method showed no significant difference between the two groups. However, the accuracy still needs to be further improved .2.To establish a mathematical model for estimating the tooth age of the third molar and the seven permanent teeth of the left mandible. By self-reproducing test, it is found that when the allowable error is controlled at 卤1 years old, The average accuracy is 74.66 and 89.37 when the allowable error is 卤1.5 years old. Conclusion 1. The image atlas of dental age imaging standard is applicable to the tooth age estimation of Chinese (Shanghai) adolescents, but the error is great, which needs to be further improved and perfected. 2. The established mathematical model of tooth age estimation can be used with the standard map. To increase the accuracy of tooth age inference.
【学位授予单位】：苏州大学
【学位级别】：硕士
【学位授予年份】：2009
【分类号】：D919

【相似文献】