Effect of whitening toothpaste on surface roughness and microhardness of human teeth: a systematic review and meta-analysis

Background: Whitening toothpastes exert a whitening effect on teeth through higher surface cleaning effectiveness resulting from the abrasive properties of the paste or specific chemical components. This systematic review and meta-analysis was conceptualized to examine the relationship between whitening toothpastes and surface roughness as well as microhardness of human teeth and to clarify the evidence base available around this relationship by conducting a systematic review and meta-analysis of studies in this topic area, looking at in vitro randomized control trials. Methods: Criteria for including studies in the review were done based on population, intervention, comparison, outcomes and study and studies were identified from electronic databases. Covidence® was used for data screening and data extraction. The CONSORT tool was used for checking relevant content and methodology used in each of the papers reviewed. Systematic review was done followed by meta-analysis, using Review Manager. Results: A total of 125 articles were obtained on key word search. After duplicate removal and title screening, 17 articles were eligible for full text review. Finally, 7 studies were included for systematic review and meta-analysis was conducted on 4 studies. The forest plot for surface roughness showed that that the meta-analytic effect was statistically significant with surface roughness value being higher in the intervention group. The forest plot for microhardness showed that the meta-analytic effect was statistically significant with the microhardness value being lesser in the intervention group. Conclusions: Although whitening toothpastes typically can lighten tooth color by about one or two shades, there is some evidence to show that these toothpastes also affect the mineral content of teeth by increasing surface roughness and reducing microhardness. More evidence and further research are needed to identify the type of whitening agent which will whiten the tooth effectively while maintaining the integrity of the tooth structure.

Book Review: Researching second language acquisition in the study abroad learning environment: An introduction for student researchers

Researching Second Language Acquisition in the Study Abroad Learning Environment: An Introduction for Student Researchers (Isabelli-García and Isabelli, 2020) presents an overview of some of the major topics relevant to research on study abroad. This book is intended to be a basic primer for advanced students and beginner professional researchers and serves to provide general orientation on various aspects ranging from language and interactional systems to research gaps in the topic area. The book gives a relatively thorough presentation on some of the scholarly perspectives on study abroad that can be used as a guidebook for anyone who is interested in conducting academic research in the area. While there are some shortcomings, the book does an excellent job of synthesizing some of the major scholarly themes that are relevant to study abroad. Consequently, this is a useful book not only for novel researchers but also for faculty or staff who are interested in organizing university study abroad programs and would like a more thorough background.

Review of the Monograph: Likhacheva O.S. Weaponry and warfare of the population of the Forest-Steppe Altai in the Early Iron Age (8th–1st centuries B.C.). Barnaul: Publ. IP I. A. Kolmogorov, 2020. 320 p. ISBN 978-5-91556-710-7

The paper presents a review on a monograph by O.S. Likhacheva, concerned with the analysis of different types of weapons and reconstruction of some aspects of the warfare of the tribes of the Forest-Steppe Altai in the 8th–1st centuries B.C., which contains a representative album of illustrations, including photographs and drawings of artifacts, artistic interpretations of weapons and images of warriors, made by the author. O.S. Likhacheva carried out a meticulous analysis of numerous categories of weapons and their fragments. However, in the opinion of the author of this review, for a considerable part of the presented inventory there is a lack of context description of the finds in the ceremonial burial complexes. This leads to the description of the votive weapons as combative, ceremonially broken items as intact, and fragmentary separate armor-clad plates as a complete armor suit. Certain selectivity of the author in writing the historiography section narrows the attention of the researcher on only one region under consideration, thus ignoring the trans-cultural nature of some types of the weapons of short-range and long-range combat among the nomads of the Central Asia in the 8th–1st centuries B.C., as well as the body of the material from the monuments of the Novosibirsk Ob region which fit in the topic area of the research. The author recommends the book of O.S. Likhacheva to all interested in the history and archaeology of Altai Krai and Upper Ob region.

A bibliometric analysis of materials research in Indonesian journal using VOSviewer

This study aims to analyze the scope of research on materials using a bibliometric review and data mapping process. Research data on materials were obtained from databases from selected journals in Indonesia. The search is done using a search engine that contains data on all related journal articles. The search process is based on a topic area with titles, keywords, and abstracts in the study material. The mapping process is done using VOSviewer. A total of 60 relevant articles were found. The results showed that the most studied study material was in the 2016-2021 range. Meanwhile, in the field of chemistry, the “acid” term is the most widely discussed material. Among all contributing countries, Indonesia is the largest country with 43 articles. Indonesia also has the most links with other countries, namely 8 links. Through VOSviewer we analyze how many articles have been published about the material and its relation to the topic area. This review can certainly provide a reference point for further research related to materials.

Credibility contests: The contributions of experiential knowledge to radicalisation expertise

Radicalisation has become a highly influential idea in British policy making. It underpins and justifies Prevent, a core part of the UK's counter-terrorism strategy. Experts have theorised the radicalisation process, often beset by a weak evidence base and mired in fundamental contestation on definitions and explanatory factors. Experiential experts have been active contributors to these debates, presenting a challenge to the low-ranking role often given to experiential knowledge in evidence hierarchies and a contrast to policy areas in which it remains poorly valued. This paper draws on interviews with radicalisation experts to examine the dynamics of this pluralisation in practice. With a focus on credibility contests, it explains how experiential experts can claim authoritative knowledge and the challenges they face from those who prioritise theory-driven empirical data as the basis for contributions to knowledge. The paper draws out the implications for understandings of expertise of this newly conceptualised, evidence poor and highly applied topic area.

Research priority setting in obesity: a systematic review

Aim Obesity research priority setting, if conducted to a high standard, can help promote policy-relevant and efficient research. Therefore, there is a need to identify existing research priority setting studies conducted in the topic area of obesity and to determine the extent to which they followed good practice principles for research priority setting. Method Studies examining research priority setting in obesity were identified through searching the MEDLINE, PBSC, CINAHL, PsycINFO databases and the grey literature. The nine common themes of good practice in research priority setting were used as a methodological framework to evaluate the processes of the included studies. These were context, use of a comprehensive approach, inclusiveness, information gathering, planning for implementation, criteria, methods for deciding on priorities, evaluation and transparency. Results Thirteen articles reporting research prioritisation exercises conducted in different areas of obesity research were included. All studies reported engaging with various stakeholders such as policy makers, researchers and healthcare professionals. Public involvement was included in six studies. Methods of research prioritisation commonly included both Delphi and nominal group techniques and surveys. None of the 13 studies fulfilled all nine of the good practice criteria for research priority setting, with the most common limitations including not using a comprehensive approach and lack of inclusivity and evaluating on their processes. Conclusion There is a need for research priority setting studies in obesity to involve the public and to evaluate their exercises to ensure they are of high quality.

Instructional Design for an Undergraduate Laboratory Course in Molecular Biophysics

ABSTRACT In this article, an approach to teaching molecular biophysics is described. The organization and course content has been carefully chosen and curated so that fundamental ideas in molecular biophysics can be taught effectively to upper classmen in higher education. Three general topic areas are introduced along with accompanying experiments that illustrate major principles related to each topic area. This article outlines an approach to organizing chosen course material and suggests multiple teaching activities within each major topic area: thermodynamics, kinetics, and structural biology. Subtopics are presented along with suggested laboratory experiments. The experiments are outlined in a way that they can be readily adopted by educators teaching a biophysical chemistry lab. The accompaniment of workshop exercises as an additional teaching modality is a component of the course intended to enhance the development of important problem-solving skills and comprehension of new content. Finally, a reflection on student feedback and course outcomes along with targeted learning goals is discussed.

Evolution of XR Research in Brazil according to the first 22 SVR editions

Although Virtual Reality technology was first developed almost sixty years ago, there has been little survey work giving an overview on how research in VR, AR and MR evolved in Brazil along with their future trends. We provide such analysis by reviewing the development made since the first WRV event, back in 1997, until SVR 2020. The first 22 event editions may help understand how the area was explored and provide a roadmap for future research. The 609 full papers analyzed were compiled into an open catalog, available on the internet. It features important filter capabilities, enabling the quick selection of papers based on citation number, conference topic, area of application, user experiments, statistical analysis and so on. We hope this tool to be of great value to the field, and also for helping researchers decide which topics should be explored when they are beginning their own studies in the area. In this analysis, we also refer to the most frequent authors in the area and how they contributed to the field based on their expertise and research group.

Are some feasibility studies more feasible than others? A review of the outcomes of feasibility studies on the ISRCTN registry

Background Feasibility studies are often conducted before committing to a randomised controlled trial (RCT), yet there is little published evidence to inform how useful feasibility studies are, especially in terms of adding or reducing waste in research. This study attempted to examine how many feasibility studies demonstrated that the full trial was feasible and whether some feasibility studies were inherently likely to be feasible or not feasible, based on the topic area and/or research setting. Methods Keyword searches were conducted on the International Standard Randomised Controlled Trials Number (ISRCTN) registry to identify all completed feasibility studies which had been conducted in the UK. Results A total of 625 records from the 1933 identified were reviewed before it became evident that it would be futile to continue. Of 329 feasibility studies identified, 160 had a known outcome (49%), 133 (83%) trials were deemed to be feasible and only 27 (17%) were reported to be non-feasible. There were therefore too few studies to allow the intended comparison of differences in non-feasible studies by topic and/or setting. Conclusions There were too few studies reported as non-feasible to draw any useful conclusions on whether topic and/or setting had an effect. However, the high feasibility rate (83%) may suggest that non-feasible studies are subject to publication bias or that many feasible studies are redundant and may be adding waste to the research pathway.

Peer review declaration

All papers published in this volume of IOP Conference Series: Materials Science and Engineering have been peer reviewed through processes administered by the Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing. • Type of peer review: Double-blind • Conference submission management system: There are 4 editors, each for one topic area. According to the abstract, the editors will assess the suitability of the manuscript for the conference. The full manuscript is sent to two/three reviewers. According to the reviewers’ reports and the editor’s comments, the author makes corrections or additions. • Number of submissions received: 27 • Number of submissions sent for review: 24 • Number of submissions accepted: 23 • Acceptance Rate (Number of Submissions Accepted/Number of Submissions Received X 100): 85 • Average number of reviews per paper: 2.3 • Total number of reviewers involved: 49 • Any additional info on review process: The novelty of the article and its impact on the field are the main aspects we consider. We evaluate whether the methodology used is appropriate. We also assess whether the exact technical specifications of the study materials and equipment are described, we consider the adequacy of the sample size and the quality of the figures. We assess whether the findings in the manuscript are aptly supplemented by the supplementary section and whether the authors have followed the submission guidelines. We consider whether the results or the proposed methodology have some potential broader applicability or relevance. We pay attention to the results and whether they have been discussed with other similar published studies. • Contact person for queries: Name: Martin Nejedlik Affiliation: Reseach Institute for Building Materials, Brno, Czech Republic Email: [email protected]