Human dental age estimation by calculation of pulp-tooth volume ratios yielded on clinically acquired cone beam computed tomography images of monoradicular teeth

Abstract: Secondary dentine is responsible for a decrease in the volume of the dental pulp cavity with aging. The aim of this study is to evaluate a human dental age estimation method based on the ratio between the volume of the pulp and the volume of its corresponding tooth, calculated on clinically taken cone beam computed tomography (CBCT) images from monoradicular teeth. On the 3D images of 111 clinically obtained CBCT images (Scanora^®3D dental cone beam unit) of 57 female and 54 male patients ranging in age between 10 and 65 years, the pulp–tooth volume ratio of 64 incisors, 32 canines, and 15 premolars was calculated with Simplant^® Pro software. A linear regression model was fit with age as dependent variable and ratio as predictor, allowing for interactions of specific gender or tooth type. The obtained pulp–tooth volume ratios were the strongest related to age on incisors.     

Three-dimensional modeling of the various volumes of canines to determine age and sex: a preliminary study

Canines are usually used in anthropological and forensic sciences for sex and age determination. The best methods to estimate age are based on secondary dentine apposition, evaluated from periapical X-rays. The aim of this study was to propose a new method of sex and age estimation using 3D models to obtain more precise predictions using tooth volumes. Fifty-eight dental CT scans of patients aged 14-74 with a well-balanced sex ratio composed the sample. One hundred and thirty-three healthy canines were modeled (Mimics 12.0). The sample was divided into a training sample and a validation sample. An age formula was determined using the "pulp volume/tooth volume" ratio. Sex prediction was adjusted with total volumes. Applying the equations to the validation sample, no significant difference was found between the real and predicted ages, and 100% of the sex predictions were correct. This preliminary study gives interesting results, and this method is worth being tested on a larger data sample.     

广东省6～15周岁汉族人牙龄的研究

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。     

网络产业中市场支配地位认定面临的新问题

网络产业中的市场支配地位受到不同于传统产业的一系列因素的影响,诸如网络效应、产品兼容、用户锁定、知识产权以及技术标准等都在网络产业市场支配地位的形成与维护中扮演重要角色。与之相适应,网络产业中的市场支配地位认定也面临一系列新问题：相关地区市场的界定在网络产业中变得更加复杂,传统的＂假定垄断者测试法＂面临质疑与挑战;市场份额对垄断力的影响在网络产业中相对减小,其计算方法与数值功能在网络产业中需要重新调整与评估;市场进入壁垒对垄断力的影响在网络产业中相对提升,传统壁垒减弱而新型壁垒增强。而将纯粹网络市场与混合市场予以区分、对＂盈利模式测试法＂、＂产品性能测试法＂、＂销售方式测试法＂等的尝试以及对由网络效应及其作用下的用户锁定、知识产权、技术标准等因素引发的新型市场进入壁垒的关注,则为解决这些新问题提供了具有建设性意义的新思路。     

肋软骨分析检验技术在法医学中的应用

传统法医人类学对肋软骨的分析检验仅限于形态学检验.近年来,法医影像学以及分子遗传学的发展丰富了人类肋软骨的分析检验技术,并且已经能够运用于法医学实践中.本文从肋软骨的组织学特性入手,综述了近年来肋软骨在法医人类学性别判定、年龄推断等方面的研究进展,以期为同行提供借鉴和参考.     

STATE CHILD EMOTIONAL ABUSE LAWS: THEIR FAILURE TO PROTECT CHILDREN WITH GENDER IDENTITY DISORDER

Emotional abuse of children with Gender Identity Disorder by parents is very difficult to identify and prevent. State investigators of abuse and neglect often have a hard time determining if the reasons for mental illness and psychological harm in children are due to the actions of their parents, or if they stem from other sources. Once identified, it becomes even harder to prove in court for purposes of ordering services or removing the child from the home if the abuse is severe enough. With children who are gender non‐conforming, this task becomes exponentially more difficult due to the low prevalence rate, discrimination, stereotypes, and a parent's right to bring up their child as they choose. These youth face discrimination and violence in school, work, their communities, and also within their own families. Emotional abuse statutes are too vague to protect youth who are gender non‐conforming. The vague and unclear laws lead to inconsistency in the application of the law and lack of protection of the children because judges and investigators are not aware of how parent's actions harms youth with gender identity disorder. Therefore, states should adopt the model statute within this Note which defines specific actions by parents which would not qualify as abuse when involving gender conforming youth but qualifies as abuse for children with gender identity disorder. Many states already have statutes which define physical abuse, sexual abuse and abandonment by specific actions by parents towards their children. This proposal will enable both the state and the judges to properly identify victims with gender identity disorder of emotional abuse and provide for their protection.     

Accounting for Future Generations: Intergenerational Equity in Australia1

Australian governments have published three intergenerational reports since 2002. In line with a general international trend these reports pointed to a problem said to arise from an ageing population which exposes Australia to the risk of a future major fiscal crisis. In this article we argue that by failing to use a generational accounting framework, the reports privilege the elderly at the expense of young people. Added to this, they fail to engage any discussion of intergenerational equity defined as distributive fairness and justice. In this article we explore the value of various approaches to intergenerational justice, focusing on the Principle of Intergenerational Neutrality derived from Rawls' theory of justice. We argue that this does not work as well from a policy point of view as Sen's freedom‐as‐capabilities approach. We conclude that linking Sen's approach to justice to a generational accounting will enable governments to address future issues of equity.     

基于社会稳定背景下的青年就业问题研究

充分就业是实现社会和谐的重要保证。青年作为一个充满活力的群体,其就业程度事关经济社会发展和社会和谐稳定。影响青年就业的原因很多,既有社会经济环境、城乡差距等客观原因,也有青年自身技能欠缺、就业观念陈旧等主观原因。为此,需要政府、社会、家庭以及青年个体等多方共同努力,采取多种行之有效措施,以解决好青年就业问题。     

书法对青少年心理健康发展的影响

现代化不仅挑战着以书法为代表的中国传统文化,也在一定程度上了造成了青少年的心理问题。书法具有德、智、美的全面教育功能,通过书法教育,可以有效地提升青少年心理健康,锻炼集中注意的能力,培养良好的情绪情感和气质,塑造健康完善的人格。     

论相对刑事责任年龄承担责任范围的标准

我国《刑法》第17条第2款规定:"已满14周岁不满16周岁的人,犯故意杀人、故意伤害致人重伤或者死亡、强奸、抢劫、贩卖毒品、放火、爆炸、投放危险物质罪的,应当负刑事责任。"对于这8种犯罪是指犯罪行为还是具体罪名,刑法学界展开了激烈的争论,大体上有罪行说、罪名说两种观点。相对刑事责任年龄承担责任范围的标准具有不确定性,对于相对刑事责任年龄承担刑事责任的范围标准不能一概而论,应该具体问题具体分析。因此在罪行说和罪名说的基础上引入附条件的刑事责任年龄制,对于完善相对刑事责任年龄人承担责任范围的标准具有一定意义。