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Article: Endodontic Dentistry: Analysis of Dentinal Stress and Strain Development during Shaping of Curved Root Canals.

Iosif, Laura / Dimitriu, Bogdan / Niţoi, Dan Florin / Amza, Oana

2023 Volume 11, Issue 22

Abstract: Background: Endodontic shaping causes stress and strain in the root canal dentin. Dentin microcracks have the potential to be later followed by root fractures occurring under the occlusal load. The aim of our research was to theoretically determine the ... ...

Abstract	Background: Endodontic shaping causes stress and strain in the root canal dentin. Dentin microcracks have the potential to be later followed by root fractures occurring under the occlusal load. The aim of our research was to theoretically determine the values of such dentinal states of stress and strain during the endodontic shaping of curved root canals using finite element analysis (FEA). Methods: To highlight the stress concentrations in dentin, two geometric models were created considering the volume of the curved dental root and the contact between the endodontic file and the root canal walls. The application of forces with different values was simulated both on a uniform curved root canal and on a root canal with an apical third curvature of 25° as they would be applied during the preparation of a root canal. Results: In the case of the first model, which was acted upon with a force of 5 N, the deformations of the root canal appeared along the entire working length, reaching the highest values in the apical third of the root, although there were no geometric changes in the shape of the root canal. Regarding the second root model, with an apical third curvature of 25°, although the applied force was 2 N, the deformations were accompanied by geometric changes in the shape of the root, especially in the upper part of the apical third. At a higher force of 7 N exerted on the endodontic file, the geometric shape changed, and the deformation reached extreme critical values. The resulting tensile stresses appearing in the experimental structure varied similarly to the deformations. Conclusions: Significant stress and strain can develop, especially in the apical third of curved root canals during their shaping, and the risk of cracks is higher for endodontically treated teeth presenting severe curvatures in the apical third of the root.
Language	English
Publishing date	2023-11-07
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2721009-1
ISSN	2227-9032
ISSN	2227-9032
DOI	10.3390/healthcare11222918
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Academic Success, Emotional Intelligence, Well-Being and Resilience of First-Year Forestry Students

Laura Elena Năstasă / Elena Cocoradă / Iosif Vorovencii / Alexandru Lucian Curtu

Forests, Vol 13, Iss 758, p

2022 Volume 758

Abstract: Academic success is conceptualized as a multifactor model, achievement and persistence after the first year of study being considered the main learning outcomes. In this area, the findings are inconsistent, depending on the academic context, individual ... ...

Abstract	Academic success is conceptualized as a multifactor model, achievement and persistence after the first year of study being considered the main learning outcomes. In this area, the findings are inconsistent, depending on the academic context, individual characteristics and diversity of psychological measures. Here, we conducted two related correlational studies to analyze variables of the emotional domain, as emotional intelligence (2017–2019), emotions, well-being and resilience (2018–2020), dropout intention, perceived barriers to completion at the beginning of first years of study in forestry, academic performance and real dropout at the end of the first year of study and several socio-demographic variables. The two studies focused on undergraduate students and included 367 and 227 participants, respectively. Forestry students with higher academic performance report higher accomplishment and engagement and feel weak negative emotions concerning aversive academic assessment compared with students with lower academic performance and students that abandoned their studies. Female students and students with full ECTS load at the end of the first year use their emotions more effectively, have reported lower dropout intention and lower perception of barriers to completion of study, and have higher GPA admission and expected GPA. Performance at the end of the first year is explained by GPA admission, relationships with high school teachers, expected GPA, gender, and academic resilience. Dropout intention is explained by barriers to completion of studies, general negative emotions and negative affect related to threatened assessment situations, and managing others’ emotions. Our findings may help develop intervention measures at the individual and organizational level.
Keywords	forestry students ; academic success ; emotions ; barriers to completion ; well-being ; gender ; Plant ecology ; QK900-989
Subject code	370
Language	English
Publishing date	2022-05-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Perceptions and Expectations of Academic Staff in Bucharest towards the COVID-19 Pandemic Impact on Dental Education.

Iosif, Laura / Țâncu, Ana Maria Cristina / Didilescu, Andreea Cristiana / Imre, Marina / Pițuru, Silviu Mirel / Ionescu, Ecaterina / Jinga, Viorel

International journal of environmental research and public health

2023 Volume 20, Issue 3

Abstract: Dental education was severely challenged by the COVID-19 pandemic worldwide. The evaluation of the viewpoint of the dental teachers of the Faculty of Dentistry at "Carol Davila" University of Medicine and Pharmacy in Bucharest, Romania, on these ... ...

Abstract	Dental education was severely challenged by the COVID-19 pandemic worldwide. The evaluation of the viewpoint of the dental teachers of the Faculty of Dentistry at "Carol Davila" University of Medicine and Pharmacy in Bucharest, Romania, on these exceptional circumstances' consequences was the objective of this paper. A cross-sectional study was conducted in April 2022, on the academic staff who reported their perceptions of the emotional and educational impact of the pandemic by completing a Google Forms questionnaire. Although a significant emotional impact of the pandemic was reported by over a third of the participants (31.2%), most of them being teachers of fifth-year dental students (
MeSH term(s)	Humans ; Male ; Pandemics ; COVID-19/epidemiology ; Cross-Sectional Studies ; Motivation ; Education, Dental
Language	English
Publishing date	2023-01-18
Publishing country	Switzerland
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2175195-X
ISSN	1660-4601 ; 1661-7827
ISSN (online)	1660-4601
ISSN	1661-7827
DOI	10.3390/ijerph20031782
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Article: Comparative Assessment of the Functional Parameters for Metal-Ceramic and All-Ceramic Teeth Restorations in Prosthetic Dentistry-A Literature Review.

Ispas, Ana / Iosif, Laura / Popa, Daniela / Negucioiu, Marius / Constantiniuc, Mariana / Bacali, Cecilia / Buduru, Smaranda

Biology

2022 Volume 11, Issue 4

Abstract: The metal-ceramic fixed partial prosthesis is the golden standard for posterior tooth restorations. Following the demands of patients and clinicians for metal-free restorations, all-ceramic materials were developed as they offer an adequate alternative ... ...

Abstract	The metal-ceramic fixed partial prosthesis is the golden standard for posterior tooth restorations. Following the demands of patients and clinicians for metal-free restorations, all-ceramic materials were developed as they offer an adequate alternative with better optical qualities and good mechanical properties. This study aims to carry out a bibliographic review to assess the survival rate and the biological and technical complications of all-ceramic and metal-ceramic fixed partial dentures. An electronic search for articles in the English language literature was performed using PubMed (MEDLINE). This literature review focused on research studies between 2010 and 2020 that performed clinical studies on tooth-supported fixed partial dentures with a mean follow-up of at least 3 years. All the studies, which analyzed the survival and complications of tooth-supported fixed partial dentures, were included. Thus, 14 studies reporting on 756 all-ceramic and 160 metal-ceramic fixed partial dentures met the inclusion criteria. A comparative analysis was carried out based on all the data existing in the studies included in this review. The metal-ceramic fixed partial dentures showed survival rates of 95% to 100% at 3-, 5-, and 10-year follow-up periods. Zirconia fixed partial dentures were reported to have survival rates of 81% to 100% at 3-, 5-, 9-, 10-year follow-up evaluations. The reinforced glass-ceramic fixed partial dentures showed survival rates of 70% to 93.35% at 5 years, while the alumina FPDs showed a survival rate of 68% at 3 years follow-up. The incidence of caries and loss of vitality were reported as higher for all-ceramic prostheses as compared to the metal-ceramic ones. A significant framework fracture was reported for glass-infiltrated alumina fixed partial dentures in comparison to metal-ceramic fixed partial dentures. All-ceramic and metal-ceramic restorations showed similar survival rates after 3 years, although all-ceramic restorations have problems with technical complications such as chipping, which can lead to framework fractures over time.
Language	English
Publishing date	2022-04-05
Publishing country	Switzerland
Document type	Journal Article ; Review
ZDB-ID	2661517-4
ISSN	2079-7737
ISSN	2079-7737
DOI	10.3390/biology11040556
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Article: SEM Evaluation of Marginal Adaptation E-Max Crowns Manufactured by Printing-Pressed and Milling.

Ispas, Ana / Moldovan, Marioara / Cuc, Stanca / Prodan, Doina / Bacali, Cecilia / Petean, Ioan / Buduru, Smaranda / Manziuc, Manuela / Iosif, Laura

Diagnostics (Basel, Switzerland)

2023 Volume 13, Issue 23

Abstract: Dental crown marginal adaptation is a matter of the success of dental restoration treatment. Nowadays, there are many technological ways for crown manufacturing, such as tridimensional printing of an exactly desired shape through CAD-assisted systems and ...

Abstract	Dental crown marginal adaptation is a matter of the success of dental restoration treatment. Nowadays, there are many technological ways for crown manufacturing, such as tridimensional printing of an exactly desired shape through CAD-assisted systems and the appropriate shape milling of a predesigned bulk crown. Both methods are developed for patient benefits. The current research aims to investigate the marginal adaptation of E-Max crowns manufactured by printing-pressed and milling methods. The in vitro cementation procedures were effectuated on healthy teeth extracted for orthodontic purposes according to the standard procedures and the marginal adaptation was investigated with SEM microscopy. The restoration overview was inspected at a magnification of 100× and the microstructural details at 400×. The integrity of marginal adaptation was properly inspected in identical samples on segments of 2 mm from each buccal, palatal, distal and mesial side. The obtained results reveal a good marginal adaptation for all samples, with some particularities. The statistical analysis shows that the best values of the marginal adaptation were obtained for vestibular/buccal and palatal sides of the teeth being situated around 90-95%, while the values obtained for distal and mesial sides are slightly lower such as 80-90%. Furthermore, it was observed that the milled crowns presents better marginal adaptations than the printed-pressed ones, sustained by the statistical
Language	English
Publishing date	2023-11-23
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2662336-5
ISSN	2075-4418
ISSN	2075-4418
DOI	10.3390/diagnostics13233518
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Article ; Online: Self-Perceived Impact of COVID-19 Pandemic by Dental Students in Bucharest.

Iosif, Laura / Ţâncu, Ana Maria Cristina / Didilescu, Andreea Cristiana / Imre, Marina / Gălbinașu, Bogdan Mihai / Ilinca, Radu

International journal of environmental research and public health

2021 Volume 18, Issue 10

Abstract: All social and economic systems worldwide, including the educational one have been disrupted by escalating the global COVID-19 pandemic. One of the most impacted areas were the medical and dental education fields, due to the forced break from clinical ... ...

Abstract	All social and economic systems worldwide, including the educational one have been disrupted by escalating the global COVID-19 pandemic. One of the most impacted areas were the medical and dental education fields, due to the forced break from clinical practice during the lockdown, which affected both the educational part, as well as the patients. Thus, the main goal of our research was to investigate the impact of the COVID-19 pandemic on the dental students' education as related to their perceptions and evaluations, in Carol Davila University of Medicine and Pharmacy, Bucharest, Romania. A cross-sectional study was conducted on 878 dental students who reported their perception of the psychological and educational impact of this period by completing a Google Forms questionnaire. Collected data were statistically analyzed using Stata/IC 16. There was a severe psychological impact among the respondents, the levels of stress being perceived as high and very high (33.83%,
MeSH term(s)	COVID-19 ; Communicable Disease Control ; Cross-Sectional Studies ; Humans ; Pandemics ; Romania/epidemiology ; SARS-CoV-2 ; Students, Dental
Language	English
Publishing date	2021-05-14
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2175195-X
ISSN	1660-4601 ; 1661-7827
ISSN (online)	1660-4601
ISSN	1661-7827
DOI	10.3390/ijerph18105249
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Article ; Online: Dropout Intention, Motivation, and Socio-Demographics of Forestry Students in Romania

Elena Cocoradă / Alexandru Lucian Curtu / Laura Elena Năstasă / Iosif Vorovencii

Forests, Vol 12, Iss 618, p

2021 Volume 618

Abstract: Reducing students’ dropout rate is a major challenge for universities. Based on a quantitative approach, this study aims to analyze and explain students’ dropout intention at the largest forestry school in Romania by collecting data in their first two ... ...

Abstract	Reducing students’ dropout rate is a major challenge for universities. Based on a quantitative approach, this study aims to analyze and explain students’ dropout intention at the largest forestry school in Romania by collecting data in their first two months of the academic year prior to failing any courses. The study participants are undergraduate freshmen, male and female students, and the tools are psychological instruments commonly used or specifically developed for this study. Our findings partly confirm previous results, such as the higher intention of dropping out among male students compared to females, and also among students with admission GPA lower or equal to seven, on a GPA scale from 1 to 10, and among students from families with low income. Dropout intention can be explained by the academic performance expectancy, gender, family, socio-economic status, and perceived barriers to completion of studies. There were no differences regarding whether students were from urban or rural areas, proximity of university to home, and high school academic program. Our results may help to implement efficient measures for increasing student retention.
Keywords	dropout rate ; forestry ; university education ; freshmen ; gender ; Plant ecology ; QK900-989
Subject code	420
Language	English
Publishing date	2021-05-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: SEM Evaluation of Marginal Adaptation E-Max Crowns Manufactured by Printing-Pressed and Milling

Ana Ispas / Marioara Moldovan / Stanca Cuc / Doina Prodan / Cecilia Bacali / Ioan Petean / Smaranda Buduru / Manuela Manziuc / Laura Iosif

Diagnostics, Vol 13, Iss 23, p

2023 Volume 3518

Abstract	Dental crown marginal adaptation is a matter of the success of dental restoration treatment. Nowadays, there are many technological ways for crown manufacturing, such as tridimensional printing of an exactly desired shape through CAD-assisted systems and the appropriate shape milling of a predesigned bulk crown. Both methods are developed for patient benefits. The current research aims to investigate the marginal adaptation of E-Max crowns manufactured by printing-pressed and milling methods. The in vitro cementation procedures were effectuated on healthy teeth extracted for orthodontic purposes according to the standard procedures and the marginal adaptation was investigated with SEM microscopy. The restoration overview was inspected at a magnification of 100× and the microstructural details at 400×. The integrity of marginal adaptation was properly inspected in identical samples on segments of 2 mm from each buccal, palatal, distal and mesial side. The obtained results reveal a good marginal adaptation for all samples, with some particularities. The statistical analysis shows that the best values of the marginal adaptation were obtained for vestibular/buccal and palatal sides of the teeth being situated around 90–95%, while the values obtained for distal and mesial sides are slightly lower such as 80–90%. Furthermore, it was observed that the milled crowns presents better marginal adaptations than the printed-pressed ones, sustained by the statistical p < 0.05. This indicates that the milling process allows a better fit of the crown to the tooth surface and preserves the integrity of the bonding cement layer.
Keywords	E-Max crowns ; marginal adaptation ; SEM microscopy ; Medicine (General) ; R5-920
Subject code	670
Language	English
Publishing date	2023-11-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Perceptions and Expectations of Academic Staff in Bucharest towards the COVID-19 Pandemic Impact on Dental Education

Laura Iosif / Ana Maria Cristina Țâncu / Andreea Cristiana Didilescu / Marina Imre / Silviu Mirel Pițuru / Ecaterina Ionescu / Viorel Jinga

International Journal of Environmental Research and Public Health, Vol 20, Iss 1782, p

2023 Volume 1782

Abstract: Dental education was severely challenged by the COVID-19 pandemic worldwide. The evaluation of the viewpoint of the dental teachers of the Faculty of Dentistry at “Carol Davila” University of Medicine and Pharmacy in Bucharest, Romania, on these ... ...

Abstract	Dental education was severely challenged by the COVID-19 pandemic worldwide. The evaluation of the viewpoint of the dental teachers of the Faculty of Dentistry at “Carol Davila” University of Medicine and Pharmacy in Bucharest, Romania, on these exceptional circumstances’ consequences was the objective of this paper. A cross-sectional study was conducted in April 2022, on the academic staff who reported their perceptions of the emotional and educational impact of the pandemic by completing a Google Forms questionnaire. Although a significant emotional impact of the pandemic was reported by over a third of the participants (31.2%), most of them being teachers of fifth-year dental students ( p = 0.019), the perceived stress had an impact on the teaching performance in few of them (14%), the quality of sleep remaining unaffected in most of them (53.7%), whereas the level of anxiety was low (57%). An educational impact regarding the techno difficulties during the online transition was mentioned by few respondents (16.1%), with male teaching staff facing the fewest problems ( p = 0.024), as well as low levels of difficulties in transmitting academic information (11.9), with men also being the most unaffected ( p = 0.006). More than half of the participants (59.1%) rather see digital and/or virtual education during the pandemic as having adverse effects on the educational system, the most sceptical being teachers of the fifth ( p = 0.001) and sixth years ( p = 0.001). The COVID-19 pandemic affected the academic staff of the Faculty of Dentistry at “Carol Davila” University of Medicine and Pharmacy in Bucharest, Romania, not only at a personal level but also at a professional, pedagogical one, due to the introduction of the online teaching system followed by the hybrid one. Age group, gender, and teaching year differentiated the degree of emotional and educational impairment.
Keywords	dental education ; dental teachers ; COVID-19 pandemic ; teaching performance ; manual skills ; digital education ; Medicine ; R
Subject code	370
Language	English
Publishing date	2023-01-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: THE INFLUENCE OF TECHNOLOGICAL FACTORS ON THE LEVEL OF SOME SWEET CORN HYBRIDS PRODUCTION IN THE TRANSYLVANIAN CONDITIONS

Diana Elena Iosif / Emil Luca / Maria Pârv / Adela Hoble / Laura Cristina Luca

Agricultura, Vol 118, Iss 1-

2021 Volume 2

Abstract: This paper presents the results of research on the influence of some technological factors on the level of production at irrigated sweet corn, in the conditions of Henig - Alba Iulia, in 2020. As a result of research it was found that irrigation and ... ...

Abstract	This paper presents the results of research on the influence of some technological factors on the level of production at irrigated sweet corn, in the conditions of Henig - Alba Iulia, in 2020. As a result of research it was found that irrigation and fertilization applied to sweet corn have a favorable influence on the production obtained. Among the hybrids analyzed, the best results were obtained for the hybrid Deliciul Verii, to which a basic fertilization + additional fertilization with NPK was applied. The results show that in both the irrigated and the non-irrigated version, the differences between the yields obtained by Deliciul Verii and Estival hybrids are significant compared to the Dulcin (control) hybrid. In the case of Deliciul Verii hybrid, the yields obtained are distinctly significant compared to the yields obtained from the Dulcin hybrid, and in the case of the Estival hybrid, the yields obtained are negatively very significant compared to the yields obtained from the Dulcin hybrid.
Keywords	irrigation ; fertilization ; biological material ; production ; Agriculture ; S ; Agriculture (General) ; S1-972 ; Plant culture ; SB1-1110
Language	English
Publishing date	2021-07-01T00:00:00Z
Publisher	AcademicPres
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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