根据中国恒乳牙交替完全人群数字全颌曲面断层片进行个体识别研究

发布时间：2018-05-15 11:13

本文选题：数字全颌曲面断层片 + 法齿学　；参考：《山西医科大学》2009年硕士论文

【摘要】： 目的本研究旨在探讨中国恒乳牙交替完全人群的数字全颌曲面断层片所显影的上颌牙影像特征,为建立健全牙齿个体识别技术及适应实际法医工作中个体识别工作的需要,尤其是为了能给对无名尸、碎尸案、白骨化尸体以及大型灾难性事件中罹难者等进行的个体识别提供一套逻辑严密、推理严谨的基础理论和一种简单便捷、迅速有效、成本低廉的个体识别方法。本研究的主要目的可归纳如下: 1.确立适用于中国恒乳牙交替完全人群数字全颌曲面断层片(上颌牙影像)同一认定的观测指标; 2.观测各观测指标在中国恒乳牙交替完全人群中的分布概率; 3.观测各观测指标测量值的变异系数,检验各观测指标的识别能力; 4.建立中国恒乳牙交替完全人群的数字全颌曲面断层片同一认定方法。 5.初步建立中国恒乳牙交替完全人群数字全颌曲面断层片同一认定所用各观测指标的测量值原始数据、相应的分段赋值以及分布概率等的数据库。 6.为法医工作人员实践中的牙齿个体识别工作提供一套逻辑严密、推理严谨的个体识别理论和一种简单便捷、迅速有效、成本低廉且相对可靠的个体识别方法。方法按照纳入标准筛选出120例中国恒乳牙交替完全人群的数字全颌曲面断层片,对每张数字全颌曲面断层片所显影的14颗上颌牙影像进行精确测量和分析,每颗牙齿共选取10个观测指标,包括5个长度性指标和5个角度性指标。运用efilm Workstation 2.1软件进行测量,Microsoft Office Excel 2003和SPSS 13.0统计软件对所测得的数据进行适当处理、统计和分析,藉以考察不同测量人员和不同拍片时间等影响因素对测量结果的影响作用;统计同源全颌曲面断层片的匹配概率;运用个人识别能力公式计算所有适用观测指标的累计个体识别率。结果 1.绝大多数观测指标的测量值在国人恒乳牙交替完全人群中的分布概率有所不同,最大的可达99.166 7%,但有些指标的测量值在某些分段赋值区段里的分布概率极小,甚至为0。 2.各观测指标测量值的变异系数大小不等。观测指标S415的测量值的变异系数最大,为516.098 8%;观测指标θ216的测量值的变异系数最小为3.116 73%。 3.综合不同测量人员和不同拍片时间两因素对观测指标测量值影响作用的统计检验结果,S116等21个观测指标测量值的统计学检验结果p0.05,具有统计学意义,不宜用于同一认定,予以剔除;其余95个观测指标测量值的统计检验结果显示,不同测量人员和不同拍片时间两因素不会对其测量结果产生显著影响。 4.两张同源数字全颌曲面断层片之间的分段赋值匹配概率:编号27353(女)的匹配概率最高,为98.947 368 42%;编号025(男)的匹配概率最低,为89.473 684 21%;都大于89.473 684 21%。非同源数字全颌曲面断层片之间的分段赋值匹配概率最高者仅为61.052 631 58%,远远小于89.473 684 21%。 5.95个观测指标的累计个体识别率可达到1030-1050数量级。 6.在30张数字全颌曲面断层片中,6张盲测片的盲测同一认定率达100%,效果满意。结论 1.在选取长度性观测指标时,不宜选取测量值较小的指标。 2.在中国恒乳牙交替完全人群中,各颗牙齿的各观测指标在各不同分段赋值区段里的分布概率不尽相同。 3.各观测指标测量值的变异系数存在一定的差异,个体识别能力有所不同。 4.S116等21个观测指标测量值受不同测量人员和不同拍片时间等因素影响显著,统计学检验结果具有统计学意义,不宜用于同一认定,予以剔除。其余95个观测指标受不同测量人员和不同拍片时间等因素的影响小,重复测量稳定,适宜用作数字全颌曲面断层片同一认定的观测指标。 5.建立了中国恒乳牙交替完全人群数字全颌曲面断层片(上颌牙影像)的分段赋值匹配概率同一认定法和累计个体识别率同一认定法。 6.初步建立起了中国恒乳牙交替完全人群的数字全颌曲面断层片同一认定所用观测指标的测量值原始数据、相应的分段赋值以及分布概率等的数据库,并为之积累了一定量的数据。
[Abstract]:Purpose

The purpose of this study is to explore the image features of maxillary teeth developed by digital total jaw curved slices in the alternating complete population of Chinese permanent deciduous teeth . To establish and improve the individual identification techniques and to meet the needs of individual identification in practice , especially in order to provide an individual identification method which is simple , convenient , rapid and effective and low in cost .

1 . To establish the same observation index applicable to the same identification of digital whole - jaw curved slices ( maxillary and maxillofacial images ) of the Chinese permanent deciduous teeth alternating complete population ;

2 . observing the distribution probability of each observation index in the alternating complete population of Chinese permanent deciduous teeth ;

3 . observing the coefficient of variation of each observation index measurement value , and testing the identification capacity of each observation index ;

4 . To establish the same identification method of digital whole - jaw surface slices in the alternating complete population of Chinese permanent deciduous teeth .

5 . The data of the original data , the assigned value of each observation index and the probability of the distribution of each observation index used in the same identification of the digital whole - jaw curved slices of the Chinese permanent deciduous teeth are preliminarily established .

6 . To provide an individual identification theory which is simple and convenient , rapid and effective , low in cost and relatively reliable for the individual identification of teeth in the practice of forensic staff .

method

According to the inclusion criteria , 120 cases of digital total gnathic surface slices of Chinese permanent deciduous teeth were screened , and the 14 maxillary teeth images developed by each digital total jaw curved slice were accurately measured and analyzed . The data obtained were processed , counted and analyzed by using efilm Workstation 2.1 software . The matching probabilities of different measuring personnel and different time of filming were investigated . The accumulative individual recognition rate of all applicable observation indexes was calculated by using the personal identification ability formula .

Results

1 . The distribution probability of most observation indexes is different in the alternating complete population of Chinese permanent deciduous teeth , and the maximum value can reach 99.166 7 % , but the distribution probability of some indexes in some segment assignment segments is very small , even zero .

2 . The variation coefficient of the measured values of each observation index is different . The variation coefficient of the measured value of the observation index S415 is the largest , which is 516.98 8 % , and the variation coefficient of the measurement value of the observation index . theta.216 is minimum 3.116 73 % .

3 . The statistical test results of the effect of different measuring personnel and different time factors on the measurement values of the observation indexes , the statistical test results of 21 observation indexes of the 21 observation indexes , and the like , which have statistical significance , are not suitable for the same identification and are eliminated ; and the statistical test results of the remaining 95 observation indexes show that the different measuring personnel and the different beat time factors do not have a significant influence on the measurement results .

4 . The probability of segmentation assignment between two homologous digital whole - jaw curved slices is that the matching probability of the number 27353 ( female ) is the highest , 98.947 368 42 % , the matching probability of the number 025 ( male ) is the lowest , which is 89.47684 21 % ; all is greater than 89.47684 21 % . The highest probability of the segmentation assignment between the non - homologous digital whole - jaw curved slices is only 61.052 631 58 % , which is much less than 89.47684 21 % .

The cumulative individual recognition rate of 5.95 observation indexes can be in the order of 1030 - 1050 .

6 . In 30 digital whole - jaw surface slices , the blind test of six blind patches has the same identification rate as 100 % and the effect is satisfactory .

Conclusion

1 . When selecting the length observation index , it is not suitable to select the index with smaller measurement value .

2 . In the alternating complete population of Chinese permanent deciduous teeth , the distribution probability of each observation index of each tooth is different in different segment assignment segments .

3 . The variation coefficient of the measured values of each observation index is different , and the individual identification ability is different .

4 . The measurement values of 21 observation indexes , such as T 1 , were affected by factors such as the time of different measuring personnel and different filming time , and the statistical test results were not suitable for the same determination and eliminated . The remaining 95 observation indexes were affected by factors such as different measuring personnel and different time of filming , and the repeated measures were stable and suitable as the observation indexes for the same identification of the digital whole - jaw curved slices .

5 . We have established the same identification method and the cumulative individual recognition rate of the segmentation assignment probabilities of the digital full - jaw curved slices ( maxillary and maxillary images ) in China ' s permanent - deciduous teeth alternating complete population .

6 . The data of the original data , the corresponding segment assignment , the probability of distribution and so on are preliminarily established , and a certain amount of data is accumulated .

【学位授予单位】：山西医科大学
【学位级别】：硕士
【学位授予年份】：2009
【分类号】：D919

【参考文献】