共查询到19条相似文献,搜索用时 421 毫秒
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目的探讨汉族人上颌中切牙牙根直径及根管管径与年龄的关系。方法 2014年11月~2015年11月间,在一家三甲医院数据库中选择420例汉族人的口腔锥形束CT资料,根据年龄将所有研究对象分为6个组别(8~12岁、13~17岁、18~22岁、23~27岁、28~32岁、33~37岁,每组70例,男女各15例。对所有研究对象上颌中切牙牙根直径及根管管径进行测量,取釉牙骨质界距根尖3/4处,分析上颌中切牙牙根直径及根管管径与年龄的关系,比较男女上颌中切牙牙根直径。结果男性与女性上颌中切牙牙根直径比较具有差异显著性(P0.05);男性与女性上颌中切牙牙根管径比较具有差异显著性(P0.05);男性与女性上颌中切牙牙根直径与牙根管径之比比较具有差异显著性(P0.05);不同性别间上颌中切牙牙根直径与牙根管径之比与年龄具有一定的相关性(R~2=0.623,P0.05)。结论汉族人上颌中切牙牙根直径及根管管径与年龄的变化具有相关性,且男性根管管径减小趋势比女性更高。 相似文献
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目的采用目前较为成熟的人格、心理测量量表,研究戒毒劳教人员的人格特征、心理卫生状况。方法对16~61岁的508名戒毒劳教人员(其中男性258人,女性250人)进行MMPI、SCL-90的测试。结果MMPI测试显示男性戒毒劳教人员Hs、Pd、Pa、Pt、Sc、Ma均高于临界值,以Hs和Pa为最高;女性Hs、Pd、Pt、Sc均高于临界值,以Hs和Pd为最高。SCL-90测试显示戒毒劳教人员在各因子分上均高于中国常模,女性甚于男性。结论戒毒劳教人员普遍存在个性特征异常和心理卫生问题,男性者个性特征异常更为突出,女性者心理卫生状况尤其值得关注。 相似文献
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目的采用CT容积再现技术(CT volume rendering technique,CT-VRT)测量西南地区汉族人胸骨柄体和,建立其与身高的回归方程。方法 160例(男、女性各80例)西南地区汉族成年体检者通过CTVRT(重建层厚1 mm)分别测量胸骨柄长和体长,二者的代数和即为柄体和。同时测量受检者真实身高,分别建立男、女性柄体和与身高的回归方程。结果分别建立了男、女性胸骨柄体和(x3)与身高(y)之间关系的一元回归方程(男性:y=135.000+2.118 x3;女性:y=120.790+2.808 x3)。两方程均具有统计学意义(P0.05),且预测准确性均为100%。结论 CT-VRT能作为胸骨指标测量的有效方法。采用CT-VRT测量的胸骨柄体和能应用于西南地区汉族人身高推算。 相似文献
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线粒体DNA测序分析及其法医学应用 总被引:2,自引:0,他引:2
本文建立一种以γ-32PATP直接标记PCR扩增引物为测序引物、纯化的PCR扩增产物为模板、Taq酶直接测序的方法、对100倒无血缘关系的中国汉族人线粒体DNA主要高变区D环区的328个碱基(第16091-16418位)进行了核酸序列分析,检出86种基因型,出现率最高者为7%;检出81个可变碱基位点。两个非血缘关系的中国汉族人出现完全相同序列的概率为0.0068。通过对2个四代家系.5个三代家系和10个两代家系分析扯实线粒体DNA是母系遗传。 相似文献
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采集温州地区300余例男性标本,对Y-GATA-H4、DYS448、DYS392的多态性进行了调查,以期获得有效的遗传背景资料,并能应用这些资料进行人类遗传学研究和法医学应用。1材料和方法样本由温州医学院附属第一医院门诊询问采集温州汉族人静脉血,男性350份,女性20份,柠檬酸钠抗凝,用chelex100法[1]提取DNA。PCR扩增引物由上海生工合成,其序列为:Y-GATA-H45-’GAGACCTAAGCAGAGATGTTGGTTTTC-3’5-’CCTCTGATGGTGAAGTAATGGAATTAGA-3’DYS448 5-’TGTCAAAGAGCTTCAATGGAGA-3’5-’TCTTCCTTAACGTGAATTTC… 相似文献
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目的研究广东省6~15周岁人群牙齿钙化的规律,建立根据牙齿钙化程度推断未成年人年龄的方法。方法观测2 710例(男性1 363例,女性1 347例)广东省6~15周岁汉族人全口曲面断层影像片,对其下颌牙齿钙化程度进行评分分级,所得数据经SPSS软件统计分析,建立根据牙齿钙化程度推断年龄的方程,并以100例(男60例、女40例)研究外样本进行盲测。结果数据统计显示,两侧同名牙钙化评分分级值的差异无显著性意义(P〉0.05),而性别间差异有显著性意义(P〈0.05);下颌单侧8颗牙齿的钙化评分分级值与年龄相关系数(r)女性为0.552~0.759,男性为0.672~0.838;所建回归模型拟合优度(R2)均在0.7以上,估计值标准误男性为0.91~1.11岁,女性为0.92~0.98岁;盲测推测年龄与真实年龄平均误差男性为0.429±0.282岁、女性为0.399±0.252岁。结论本研究所建方法推断结果准确可靠,可用于广东地区6~15周岁人群年龄推断。 相似文献
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Identification using lip prints was first performed in the 1950s and was the subject of much research in the 1960s and 70s, leading to the acceptance of this technique as evidence in the criminal justice system. Previous research has focused on identifying lip print types or on methods of obtaining hidden lip prints left at the crime scene. The present study aimed to clarify characteristics of lip prints from cadavers with various causes of death (including drowning and hanging) and to determine the effects of fixation on post mortem changes in lip impressions. 相似文献
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Luminescence is specially a useful property for the search of invisible evidences at the scene of a crime. In the latent fingerprints particular case, there are at one's disposal fluorescent reagents for their localization. The study of latent lip prints (that is lip prints from protective lipstick, or permanent or long-lasting lipstick that do not leave any visible marks) is more recent than fingerprints study. Because of the different composition of both types of prints, different reagents have been tried out on their developing. Although, lysochromes are particularly useful reagents to obtain latent lip prints, it may occur on coloured or multicoloured surfaces, the developing is not perceived due to contrast problems between the reagent and the surface where the print is searched. Again, luminescence offers the possibility to solve this problem. Nile Red is being studied as a potential developer for latent lip prints. The results on very old prints (over 1year) indicate that this reagent is highly efficient to get latent lip prints. 相似文献
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Alvarez Segui M Miquel Feucht M Castello Ponce A Verdu Pascual F 《Forensic science international》2000,112(1):41-47
Latent lip print test results produced by permanent lipsticks are presented in this work. This cosmetic product, contrary to conventional lipsticks, does not leave visible prints and can thus be overlooked at the crime scene. As print vehicles the study used ceramics, glass, cotton fabric and paper. Lip prints were left to dwell for different periods and were later developed using aluminum powder, cobalt oxide powder and magnetic powder. The results show that identifiable lip prints can be obtained up to 30 days after being produced. 相似文献
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Lip print analysis, or cheiloscopy, has the potential to join fingerprints and retinal scans as an additional method to determine human identification. This preliminary study sought to determine agreement among 20 raters, forensic odontologists, using an often referenced system that categorizes lip prints into six classes related to the dominant pattern of vertical, horizontal, and intersecting lines. Lip prints were taken from 13 individuals, and raters categorized eight distinct regions of each print. In addition to ratings made while viewing the actual prints, the raters repeated the exercise using photographs of the lip prints. Multirater kappa, a chance‐corrected measure of agreement, ranged between 0.15 for the actual prints and 0.25 for the photos, indicating only poor to fair levels of inter‐rater reliability. While these results fail to support the use of lip prints for human identification, it is possible that more intensive training may yet produce adequate levels of reliability. 相似文献
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Evaluation of Lip Prints on Different Supports Using a Batch Image Processing Algorithm and Image Superimposition 下载免费PDF全文
Lara Maria Herrera M.Sc. Clemente Maia da Silva Fernandes Ph.D. Mônica da Costa Serra Ph.D. 《Journal of forensic sciences》2018,63(1):122-129
This study aimed to develop and to assess an algorithm to facilitate lip print visualization, and to digitally analyze lip prints on different supports, by superimposition. It also aimed to classify lip prints according to sex. A batch image processing algorithm was developed, which facilitated the identification and extraction of information about lip grooves. However, it performed better for lip print images with a uniform background. Paper and glass slab allowed more correct identifications than glass and the both sides of compact disks. There was no significant difference between the type of support and the amount of matching structures located in the middle area of the lower lip. There was no evidence of association between types of lip grooves and sex. Lip groove patterns of type III and type I were the most common for both sexes. The development of systems for lip print analysis is necessary, mainly concerning digital methods. 相似文献
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Lip prints are thought to have the ability to distinguish individuals and, hence, have a potential use in human identification purposes. However, questions remain regarding their utility for sex determination. This study aimed to classify lip prints for different individuals in a Portuguese population and to determine whether sex differences exist. Lip prints of 25 females and 25 males were obtained using dark-colored lipstick and cellophane tape. Lip prints were analyzed using a magnifying lens and classified according to the Suzuki and Tsuchihashi classification. A Type II pattern was found to be most common. A comparison of lip-print patterns between males and females showed results with a statistically significant difference: Type III pattern was most common in males, and a Type II pattern in females. This study corroborates the hypothesis that lip prints are able to distinguish individuals and may be useful in sex determination. 相似文献
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Latent prints are an important evidence for identification. Nowadays, the technical means, the implementation of image processing techniques and the use of database makes it possible to detect and get information from some prints that seem to be useless at first sight. On the other hand, the possibility of using the print as a DNA source has to be considered, so as to double its identifying value. Human skin is a particularly difficult surface for developing this kind of evidences. Although different methods for locating and developing latent fingerprints on the skin have been already described, it has not been found any method, at the revised bibliography, to obtain and develop invisible lipmarks, that is, lipmarks from protective lipstick, or permanent or long-lasting lipstick. The aim of the work that follows is to determine the effectiveness of several reagents for developing invisible lipmarks on the corpses' skin. Preliminary results show that, under the described experimental conditions, the reagents used, Sudan III, Oil Red O and Sudan Black, are effective for obtaining recent latent lip prints on corpse's skin. 相似文献
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The role of the skin as a repository and masker of evidence is evaluated. Skin examination and testing are very important in the (a) identification of victims and suspects (for example, by fingerprints, lip prints, and fingernail marks), (b) recognition of patterns and shape of injurious energy impacts (for instance, recognition of type of injury and particular weapon), and (c) recovery of embedded evidence (for example, glass, wood, powder, explosives, and paint). It is also important to realize that the skin may conceal evidence by masking significant and/or lethal internal injuries. 相似文献