Effect of ultraviolet photofunctionalization of dental titanium implants on osseointegration

Objective

The aim of the current study was to evaluate the effect of ultraviolet (UV) photofunctionalization of dental titanium implants with exposure to the oral cavity on osseointegration in an animal model.

Methods

Forty-eight titanium implants (Camlog® Conelog® 4.3 mmx9.0 mm) were placed epicrestally into the edentulous jaws of three minipigs and implant stability was assessed by measuring the implant stability quotient (ISQ). Prior to implantation half of the implants were photofunctionalized with intense UV-light. After three months, the implants were exposed and ISQ was measured again. After six months of implant exposure, the minipigs were sacrificed and the harvested specimens were analyzed using histomorphometric, light, and fluorescence microscopy.

Main results

Forty-two of 48 implants osseointegrated. The overall mean bone-implant contact area (BIC) was (64±22)%. No significant differences were found in BIC or ISQ value (multivariate analysis of variance (MANOVA), P>0.05) between implants with and without exposure to UV photofunctionalization.

Conclusions

No significant effects were observed on osseointegration of dental titanium implants nine months after exposure of UV photofunctionalization.

     

Engagement with a teaching career – how a group of Finnish university teachers experience teacher identity and professional growth

The aim of this qualitative study was to identify teachers’ ways of experiencing their identity and development challenges as teachers in the social and professional context of university. Identity and development as a teacher were examined based on interviews and drawings of career paths collected from a group of university teachers representing diverse scientific fields at one research-intensive university in Finland. Based on the findings, a typology of teacher identities and classification of development themes were constructed, illustrating the experiences and drawing on the themes found in the data and comparing them to Huberman’s teachers’ career cycle as well as Åkerlind’s views on university teachers’ changes. The findings showed that those who have reached a goal-reflective and stabilised teacher identity recognise development challenges, especially in the areas of self-development and facilitation of student learning, while those who have a constructive-conflicting or unsolved teacher identity struggle with the many pressures of teaching practice and reaching teacher comfort. The learning trajectories of the studied university teachers were varied and lasted considerably longer than suggested by teachers’ career cycle views.     

Contested childhoods across borders and boundaries: Insights from curriculum provisions in Northern Ireland and the Irish Free State in the 1920s

Conceptualisations and constructs of children and childhood are temporally and contextually grounded. Historical documents are rich sources of insight and understanding regarding how children were understood, valued and treated at various times by particular societies. This article explores the conceptualisation of children and childhood in the 26-county Irish Free State (South) and the 6-county Northern Ireland (North) in the 1920s following the partition of Ireland, through the lens of educational documentation, primarily national primary school curricula. The focus on both jurisdictions is interesting in the context of partition, exploring the sometimes divergent and often convergent ways in which children were conceptualised across borders and boundaries. This article reveals, using Sorin and Galloway’s framework as a conceptual and analytical tool, that conceptualisations of children were broadly similar in the North and South but differed in their focus and enactment in both fledgling states. These disparities are largely attributable to the very different political, social and religious orientations of both jurisdictions and the use of education as a vehicle for nation-building, as well as identity and gender formation. The article also explores alternative conceptualisations of children in education policy in the North and South by presenting case study ‘outliers’ of educational provision. A century since partition, conclusions and implications are noted that resonate with contemporary elements of convergence and divergence on educational policy and the conceptualisation of children across the island of Ireland.     

Nationalisation, Localisation and Globalisation in Finnish Higher Education

This article analyses and discusses the interplay between the social processes of nationalisation, localisation and globalisation in a single European nation state. The view of nationalisation put forward draws on a national case study based on historical and sociological research findings. The second part of the article presents a case study of the nature of globalisation and localisation in an average Finnish university. The article shows that nationalisation of Finnish higher education has created a cultural understanding of higher education institutions important for competition with other nations. As for localisation, on the one hand higher education institutions support their local communities and provinces to gain social and economic benefits. On the other hand, local communities and provinces support their higher education institutions in the hope of benefiting from them. The case studies also suggest that economic globalisation creates new dynamics within higher education institutions both through strategic alliances between higher education and commercial enterprises and through the emergence of alternative new funding sources for research.     

Do parents' own school memories contribute to their satisfaction with their child's school?

In the present study a group of parents with a child in preschool were asked to give evaluative recollections of their own primary school and then to indicate the level of their satisfaction with the functioning of their child's school repeatedly in the course of the child's compulsory education. Across the follow‐up, the parents with positive recollections showed more satisfaction than those with negative recollections did. Over the years, the level of satisfaction decreased in all other groups but the fathers with positive recollections. Parents' recollections may be seen as an experience‐based component of their attitudes towards education.     

Children involved in bullying at elementary school age: their psychiatric symptoms and deviance in adolescence. An epidemiological sample

OBJECTIVE: This study investigated psychiatric symptoms and deviance at the age of 15 years among children involved in bullying at the age of 8 years or at the age of 12 years. Furthermore, the relationships between involvement in bullying at the age of 8 years, concurrent psychiatric deviance, and later psychiatric deviance were studied. METHOD: Questionnaires filled in by the parents, teachers and children themselves were used to reveal psychiatric symptoms and deviance. RESULTS: Children involved in bullying, in particular those who were bully-victims at early elementary school age and those who were victims in their early teens, had more psychiatric symptoms at the age of 15 years. The probability of being deviant at the age of 15 years was higher among children involved in bullying at the age of 8 or 12 years than among non-involved children. When concurrent psychiatric deviance was taken into account, involvement in bullying increased the probability of teacher-defined deviance at the age of 15 years. CONCLUSION: Bullying experiences are connected not only to concurrent psychiatric symptoms but also to future psychiatric symptoms. Furthermore, the probability of being deviant in adolescence is increased if the child has been involved in bullying at elementary school age.     

Monitoring markers of muscle damage during a 3 week periodized drop-jump exercise programme

The aim of this study was to examine changes in indirect markers of muscle damage during 3 weeks of stretch-shortening exercise with a progressively increasing load and continued modulation of various key training variables. Eight healthy untrained men performed a drop-jump programme involving a progressive increase in load impact with respect to the number of jumps performed, drop (platform) height, squat depth amplitude, and addition of weights. Maximal concentric and isometric knee extensor strength were assessed immediately before and 10?min after each training session. Voluntary and 100 Hz-stimulation-evoked torque decreased acutely after each training session relative to pre-exercise values (P?相似文献   

Effect of resistance training regimens on treadmill running and neuromuscular performance in recreational endurance runners

The purpose of this study was to assess the effects of heavy resistance, explosive resistance, and muscle endurance training on neuromuscular, endurance, and high-intensity running performance in recreational endurance runners. Twenty-seven male runners were divided into one of three groups: heavy resistance, explosive resistance or muscle endurance training. After 6 weeks of preparatory training, the groups underwent an 8-week resistance training programme as a supplement to endurance training. Before and after the 8-week training period, maximal strength (one-repetition maximum), electromyographic activity of the leg extensors, countermovement jump height, maximal speed in the maximal anaerobic running test, maximal endurance performance, maximal oxygen uptake ([V·]O(?max)), and running economy were assessed. Maximal strength improved in the heavy (P = 0.034, effect size ES = 0.38) and explosive resistance training groups (P = 0.003, ES = 0.67) with increases in leg muscle activation (heavy: P = 0.032, ES = 0.38; explosive: P = 0.002, ES = 0.77). Only the heavy resistance training group improved maximal running speed in the maximal anaerobic running test (P = 0.012, ES = 0.52) and jump height (P = 0.006, ES = 0.59). Maximal endurance running performance was improved in all groups (heavy: P = 0.005, ES = 0.56; explosive: P = 0.034, ES = 0.39; muscle endurance: P = 0.001, ES = 0.94), with small though not statistically significant improvements in [V·]O(?max) (heavy: ES = 0.08; explosive: ES = 0.29; muscle endurance: ES = 0.65) and running economy (ES in all groups < 0.08). All three modes of strength training used concurrently with endurance training were effective in improving treadmill running endurance performance. However, both heavy and explosive strength training were beneficial in improving neuromuscular characteristics, and heavy resistance training in particular contributed to improvements in high-intensity running characteristics. Thus, endurance runners should include heavy resistance training in their training programmes to enhance endurance performance, such as improving sprinting ability at the end of a race.     

Assessing “The Regulars”—and Beyond

Commenting on online news articles must be considered an online staple—an established practice among news consumers that is currently being funnelled from the Web pages of news organizations to third-party platforms such as Facebook. The paper at hand adopts an exploratory approach and provides insights into the fervency and popularity of commentators and comments on the Facebook pages of two Swedish and two Norwegian newspapers. The results indicate that while immigration issues are a common topic in both countries, the Swedish context stands out by also featuring high degrees of commenting activity in relation to issues of gender equality. Identifying a series of differences in how these opportunities to comment on news are used in each country, the Swedish context appears to offer a wider range of opinions among the most fervent commentators in comparison with Norway. A similar tendency is found among the most “liked” comments.     

The Patterning of Collaborative Behavior and Knowledge Culminations in Interdisciplinary Research Centers

Minerva - Due to investments in interdisciplinary research endeavors, the number and variety of interdisciplinary research centers have grown exponentially during the past decades. While...