Pulp volume quantification methods in cone-beam computed tomography for age estimation: A critical review and meta-analysis

The secondary dentin deposition that occurs after the tooth formation process results in a decrease in pulp cavity volume in adolescents and adults. The purpose of this critical review was to correlate pulpal and/or dental volume on cone-beam computed tomography (CBCT) with chronological age approximation. A subobjective was to investigate which methodology and CBCT technical parameters would be most appropriate to evaluate this correlation. This critical review followed the PRISMA guidelines, and it was conducted by a search through PubMed, Embase, SciELO, Scopus, Web of Science, Cochrane Library databases, as well as gray literature. Primary studies that used pulp volume, or pulp chamber to tooth volume ratio measured using CBCT were included. Seven hundred and eight indexed and 31 non-indexed records were identified. A qualitative analysis was performed including 25 selected studies with a total of 5100 individuals, age ranging from 8 to 87 years without sex predilection. The most used method was pulp volume/tooth volume. CBCT voxel size ranged between 0.09 and 0.5. Manual segmentation associated with threshold algorithms was used in most of the studies. Correlation between the pulp volume/tooth volume ratio was moderate: −0.66 for the upper central incisors, −0.59 for upper canines and −0.56 for lower canines. High heterogeneity was observed among the studies. It is concluded that pulp volume should be used with caution in age estimation. Evidence supports the preferable use of upper incisors with pulp volume/tooth volume ratio for age estimation. There is not enough evidence that voxel size interferes in age estimation by pulp volume.     

The Anti‐Incumbent Effects of Conditional Cash Transfer Programs

Scholars concur that conditional cash transfer (CCT) programs have a strong proincumbent effect among beneficiaries. Although no study has properly focused on the overall effect of cash transfers on incumbents' national vote shares, most scholars have deduced that this effect is positive; i.e., that cash transfers lead to the expansion of incumbents' electoral bases. This article analyzes survey data from nearly all Latin American countries and confirms that beneficiaries of CCT programs are more likely to support incumbents. However, it also shows that CCT programs may induce many voters who were previously incumbent supporters to vote for the opposition. As a consequence, the overall impact of cash transfers on incumbents' vote shares is indeterminate; it depends on the balance between both patterns of behavioral changes among voters. This study is the first to report evidence that cash transfer programs may have significant anti‐incumbent effects.     

An Ever-Shadowed Past? Citizens’ Attitudes towards the Dictatorship in Twenty-First Century Portugal

Abstract

Several years after the transition to democracy, positive attitudes towards the authoritarian past are still observable in Portugal: the belief that the previous regime had more good things than bad things is expressed by about one-fifth of the Portuguese. What explains this nostalgic sentiment? Are factors such as socialisation under the regime, party identification or religiosity more important than satisfaction with democracy and the state of the economy? The empirical analysis suggests that the relevance of these factors varies considerably, but socialisation phases lead to different stances on the past both in routine times and in times of economic crisis.     

Growth and the Welfare State in the EU: A Causality Analysis

In this paper, we test for causality between GDP growth andsocial protection expenditure in the European Union. To that end,we apply Hsiao's (1981) sequential procedure to data for twelveEU countries along the 1970–1994 period. Our results suggestthat, for Belgium, Germany, Ireland, Luxembourg, the Netherlands,Portugal, and Spain, causality runs only from social protectiongrowth to GDP growth, while for Denmark, France, Greece, Italy,and the United Kingdom, no causality is found between socialprotection growth and GDP growth.     

Democracy and dictatorship revisited

We address the strengths and weaknesses of the main available measures of political regime and extend the dichotomous regime classification first introduced in Alvarez et al. (Stud. Comp. Int. Dev. 31(2):3–36, 1996). This extension focuses on how incumbents are removed from office. We argue that differences across regime measures must be taken seriously and that they should be evaluated in terms of whether they (1) serve to address important research questions, (2) can be interpreted meaningfully, and (3) are reproducible. We argue that existing measures of democracy are not interchangeable and that the choice of measure should be guided by its theoretical and empirical underpinnings. We show that the choice of regime measure matters by replicating studies published in leading journals.     

Immigration Policy and Hispanic Representation in National Elections

For the first time in U.S. history, after decades of unprecedented growth in interior immigration enforcement disproportionately impacting Latinos, ten percent of the U.S. House of Representatives is Hispanic. Using congressional district-level data on all candidates participating in general elections to the U.S. House of Representatives between 2008 and 2018, we show that intensified immigration enforcement suppressed Hispanics’ representation in congressional elections. The effect—nonexistent for other minorities, such as non-Hispanic Black candidates, as well as in primary elections—is driven by local police-based measures and diminished electoral support. Furthermore, it appears more harmful during midterm elections and in localities without a sanctuary policy.     

The color of child mortality in Brazil, 1950-2000: social progress and persistent racial inequality

Now that racism has been officially recognized in Brazil, and some universities have adopted affirmative-action admission policies, measures of the magnitude of racial inequality and analyses that identify the factors associated with changes in racial disparities over time assume particular relevance to the conduct of public debate. This study uses census data from 1950 to 2000 to estimate the probability of death in the early years of life, a robust indicator of the standard of living among the white and Afro-Brazilian populations. Associated estimates of the average number of years of life expectancy at birth show that the 6.6-year advantage that the white population enjoyed in the 1950s remained virtually unchanged throughout the second half of the twentieth century, despite the significant improvements that accrued to both racial groups. The application of multivariate techniques to samples selected from the 1960, 1980, and 2000 census enumerations further shows that, controlling for key determinants of child survival, the white mortality advantage persisted and even increased somewhat in 2000. The article discusses evidence of continued racial inequality during an era of deep transformation in social structure, with reference to the challenges of skin color classification in a multiracial society and the evolution of debates about color, class, and discrimination in Brazil.