35 results on '"Zafiropoulou, M."'
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2. Dietary Habits of Greek Primary School Children
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Piperakis, S. M., Papadimitriou, V., Zafiropoulou, M., Piperakis, A. S., and Zisis, P.
- Abstract
The purpose of this study was to assess Greek primary (1st to 6th grade) school children's dietary habits and the factors influencing them. Our results show that children know the value of different foods. The socio-economic status of father has no effect on the attitude of children towards choosing their diet, however, mothers' educational status appears to have an effect on their children's behaviour. Place of residence (urban or semi-rural areas) and gender does not influence their knowledge about different diets. It was, finally, shown that as children grow older they tend to eat less healthy foods.
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- 2007
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3. Degree of conversion and mechanical properties of modern self‐adhesive luting agents
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Dimitriadi, M. Petropoulou, A. Zafiropoulou, M. Zinelis, S. Eliades, G.
- Abstract
New self‐adhesive resin composite luting agents have currently been developed, claim-ing improved properties. The study aimed to evaluate the composition, degree of conversion, and mechanical properties of Panavia SA Plus (PSP), Panavia SA Universal (PSU), SpeedCem Plus (SPC) and TheraCem Ca (THC), with the resin luting agent Panavia V5 (PV5) serving as a control. The structure of the materials was studied by FTIR spectroscopy and SEM/EDX spectrometry. Disk‐shaped specimens were prepared from each material under dual‐ and self‐curing modes (n = 5/mode and material). After a 3‐week storage period (dark/37 °C/80%RH) the Martens hardness, indentation modulus, elastic index, and creep were determined by instrumented indentation testing (IIT), while the degree of conversion was assessed by FTIR spectroscopy. Statistical analysis was performed by 2‐way ANOVA and post‐hoc testing (α = 0.05). All materials were based on aromatic monomers, except for SPC. Fillers with potentially bioactive Ca‐glasses were identified in SPC and THC, which showed the highest P/Si ratio. The dual‐curing mode demonstrated superior performance in all properties. Differences between materials within each curing mode were limited to SPC, THC (highest conversion) and PSA, PSU, SPC (highest elastic index) for dual‐curing, and THC (lowest hardness and elastic index). The results confirmed a lower self‐curing conversion in these materials, which may affect some of the mechanical properties tested. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
- Published
- 2021
4. Effect of curing mode on the conversion and IIT-derived mechanical properties of core build-up resin composites
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Dimitriadi, M. Petropoulou, A. Anagnostou, M. Zafiropoulou, M. Zinelis, S. Eliades, G.
- Abstract
The aim of the study was to evaluate the degree of conversion and the mechanical properties of five composite core build-up materials polymerized in dual-curing and self-curing modes. The materials tested were: Clearfil DC Core Plus (CF), Gradia Core (GC), Luxacore-Z Dual Smartmix (LX), Multicore Flow (MC) and Paracore (PC). Diskshaped specimens were prepared from each material; half the specimens were light-cured, whereas the rest were only self-cured. After a 3-week storage period (dark/dry/37 degrees C) the Martens Hardness, Indentation Modulus, and Elastic Index were determined by instrumented indentation testing (IIT), while the degree of conversion was assessed by ATR-FTIR spectroscopy. Statistical analysis was performed by 2-way ANOVA and post-hoc testing (alpha = 0.05). The dual-curing mode resulted in statistically higher Martens Hardness and Elastic Index than the selfcuring mode in most materials but showed insignificant differences in Indentation Modulus. MC and PC demonstrated significantly higher degree of conversion in both curing modes. Overall, the self-curing mode was inferior to the dual-curing in conversion and mechanical properties for most products, despite their differences in monomer composition and filler loading.
- Published
- 2021
5. Intervention on strategy use and on motivation of Greek pupils' reading comprehension in English classes
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Pappa, E., Zafiropoulou, M., and Metallidou, P.
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Motivation in education -- Research ,English as a second language -- Study and teaching ,Learning, Psychology of -- Research ,Health ,Psychology and mental health - Abstract
Although less skilled learners may improve their abilities through training in strategies used by successful learners, only a few studies have addressed the question of metacognitive strategy training in contexts in which foreign language is learned. This study intended to investigate whether strategy instruction on semantic mapping would produce more successful comprehension in English as a Foreign Language if a boost to students' integrative motivation was included. A sample of 119 Greek students, 14 to 15 years old, of both sexes participated. Strategy training was provided to two experimental groups, with one of them having motivation boosting. One group received only integrative motivation boosting and the control group received no strategy training or boosting, but participated in pre- and posttesting. Results imply that only the students who received intervention, either in the form of metacognitive strategy training or a boost to their integrative motivation or as a combination of these, improved their performance in English reading comprehension in the posttest phase.
- Published
- 2003
6. Self-etch silane primer: Reactivity and bonding with a lithium disilicate ceramic
- Author
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Dimitriadi, M. Zinelis, S. Zafiropoulou, M. Silikas, N. Eliades, G.
- Abstract
The aim of the study was to evaluate the stability, reactivity, and bond strength with a lithium disilicate ceramic of a self-etch silane primer (Monobond Etch and Prime/MEP). The stability was evaluated by 1H-,31P-NMR spectroscopy (before/after aging), and the reactivity by micro MIR-FTIR spectroscopy on Ge surfaces (0, 1, 24 h) using a prehydrolyzed silane primer (Calibra Silane Coupling Agent/CLB), as a control. The eect of MEP vs. 5% HF-etching on ceramic roughness was assessed by optical profilometry. The shear bond strength (SBS) of a resin composite bonded to polished ceramic surfaces treated with MEP, HF without silane (HF+NS), HF+CLB, and HF+MEP (n = 20) was evaluated after storage in water (A: 37 °C/1 week, B: 5000×/5-55 °C and C: 100 °C/24 h). Aging did not affect the silanol groups of MEP, but only the phosphate co-monomer. Silanols were reactive forming siloxanes, but exhibited lower consumption rate than CLB. HF-etching induced significantly higher values than MEP, in all the roughness parameters tested (Sa, Sz, Sdr, Sc, Sv), with the greatest dierences found in Sdr and Sv. For SBS, MEP was inferior to all treatments/storage conditions, except of HF+NS in A, where the values were similar. However, on a HF-etched substrate, MEP provided highest strength and reliability. © 2020 by the authors.
- Published
- 2020
7. Universal adhesives: Setting characteristics and reactivity with dentin
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Papadogiannis, D. Dimitriadi, M. Zafiropoulou, M. Gaintantzopoulou, M.-D. Eliades, G.
- Abstract
The aim of the study was to evaluate the performance of six commercially available universal dental adhesives: Adhese Universal (ADU), All-Bond Universal (ABU), Clearfil Universal Bond Quick (CBQ), G-Premio Bond (GPB), Prelude One (PRO) and Scotchbond Universal (SBU). The properties tested were: (a) degree of C=C conversion (DC%); (b) Vickers micro-hardness (VHN); (c) extent of oxygen inhibition (OI/μm), all related with the adhesive film properties; (d) extent of dentin demineralisation (DM%), insoluble salt formation (AS%); and (e) shear bond strength (SBS, self-etch mode) related to the adhesive-dentin interactions. Statistical analysis (α = 0.05) was performed by one-way ANOVA and Tukey's test (DC%, VHN, OI, DM% AS%) andWeibull analysis (SBS, σ0-β). The DC ranged from 67.2-82.5% (all > GPB), OI from 5.6-18.6 μm (SBU > ADU, GPB, ABU > CBQ > PRO), microhardness from 1.1-6.6 VHN (SBU > ADU > ABU > CBQ > PRO > GPB: not measurable), DM from 69.3% (GPB) to 16-12.5% (CBQ, SBU, ADU) and 13.2-10.6% (ABU, ADU, PRO), in homogeneous groups and AS from 26-15.9% (ABU, CBQ > GPB, PRO, ADU, SBU). For SBS the σ0 (characteristic life) ranged from 29.3-16.6 MPa (CBQ, ADU, ABU, SBU > PRO > GPB), the β (reliability) from 5.1-9.7 (p > 0.05). All failure modes were of mixed type (adhesive and composite cohesive). Although all these adhesives were based on the 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) adhesive monomer, the different co-monomers, solvents and catalysts led to variations in their film properties, reactivity and bonding capacity with dentin. © 2019 by the authors.
- Published
- 2019
8. Reactivity and bond strength of universal dental adhesives with Co-Cr alloy and zirconia
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Papadogiannis, D. Dimitriadi, M. Zafiropoulou, M. Gaintantzopoulou, M.-D. Eliades, G.
- Abstract
The aim of this study was to evaluate (a) the reactivity of six universal dental adhesives with polished cobalt-chrome (Co-Cr) alloy and zirconia (3Y-TZP) surfaces; and (b) to assess the shear bond strength (SBS) of a resin composite with polished and alumina-blasted surfaces as mediated by these adhesives. The products tested were Adhese Universal (AD), All-Bond Universal (AB), Clearfill Universal Bond (CB), G-Premio Bond (GP), Prelude One (PO) and Scotchbond Universal (SB). The reactivity on polished substrates was evaluated by reflection infrared microscopy (RFTIRM). The roughness parameters of polished and 50 µm alumina grit-blasted surfaces were assessed by optical profilometry. The SBS of the composite bonded to the substrates treated with each adhesive (n = 10/product) was evaluated after 1 week of storage (H2O/37 °C) by Weibull statistics. Evidence of phosphate interaction with polished substrates was obtained by FTIRM, with higher peaks on the alloy. Alumina-blasting increased all roughness parameters with higher values on the alloy. AD, CB were the strongest (σ0) treatments on alloy surfaces and AD, CB, AB, SB on zirconia. GP was the weakest on both substrates and the least reliable (β) on alloy. On polished alloy GP, PO performed better (σ0), whereas on zirconia there were no significant differences. All adhesives showed more prominent reaction with the Co-Cr alloy than with 3Y-TZP. © 2019 by the authors.
- Published
- 2019
9. Silane reactivity and resin bond strength to lithium disilicate ceramic surfaces
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Dimitriadi, M. Zafiropoulou, M. Zinelis, S. Silikas, N. Eliades, G. and Dimitriadi, M. Zafiropoulou, M. Zinelis, S. Silikas, N. Eliades, G.
- Abstract
Objective: To evaluate the silane status in commercially available products and their bonding capacity with polished glass-ceramic surfaces before and after hydrofluoric (HF) acid-etching. Methods: The products tested were Calibra Silane Coupling Agent/CS, G-Multi Primer/GM, Kerr Silane Primer/KS, Monobond Plus/MB and Scotchbond Universal Adhesive/SB. The silane status was studied by 13C nuclear magnetic resonance spectroscopy (13C-NMR). The roughness parameters of polished (group A) and HF acid-etched (group B) lithium disilicate glass-ceramic surfaces were measured by optical profilometry (n = 5/group). The interaction of the products with group A and B ceramic surfaces was examined by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). The shear strength (SBS) of a flowable composite bonded to the ceramic surfaces (groups A, B) was assessed before (NS) and after silane treatment (n = 20/group, product). Results: The NMR analysis showed the presence of silanol monomers only in CS. Methoxylated-siloxane adducts were found in GM, silanol–siloxane adducts in MB, SB, and siloxane polymers in KS. Acid-etching greatly increased Sa, Sz, Sdr, Sc and Sv parameters (p < 0.001) and ATR-FTIR analysis demonstrated evidence of bonding with the substrate in CS. Weibull analysis of SBS revealed the following rankings in characteristic life (p < 0.05): CS > SB,KS,MB > GM > NS (group A) and CS > GM > SB,KS,MB,NS (group B). The most reliable treatment in both groups was CS. For the same silane treatment, the SBS of group B were significantly higher from group A. Failures were mainly of adhesive type, except of several partial resin cohesive failures found in group B. Significance: The chemical bonding capacity of the silanes was highest in products with silanol monomers. Acid-etching increased bond strength to a level that neutralized the silane contribution in products with silanol–siloxane adducts and sil
- Published
- 2019
10. COMPETENCIES OF FORMAL CARERS REGARDING BASIC CLINICAL AND SOFT SKILLS IN THE PROVISION OF OUTPATIENT SERVICES AND PATIENTS' PERSPECTIVE: THE TWO SIDES OF THE SAME COIN
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Kaitelidou, Dzzz Baret, C. Konstantakopoulou, O. and Zafiropoulou, M. Theodorou, M. Siskou, O. Kalafati, M. and Chatzopoulou, M. Karra, V Delloro, G. Patiraki, E. and Lemonidou, C. Sourtzi, P.
- Published
- 2017
11. Competencies Of Formal Carers Regarding Basic Clinical And Soft Skills In The Provision Of Outpatient Services And Patients’ Perspective: The Two Sides Of The Same Coin
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Kaitelidou, Dzzz, primary, Baret, C, additional, Konstantakopoulou, O, additional, Zafiropoulou, M, additional, Theodorou, M, additional, Siskou, O, additional, Kalafati, M, additional, Chatzopoulou, M, additional, Karra, V, additional, Delloro, G, additional, Patiraki, Ε, additional, Lemonidou, C, additional, and Sourtzi, P, additional
- Published
- 2017
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12. PHP234 - Competencies Of Formal Carers Regarding Basic Clinical And Soft Skills In The Provision Of Outpatient Services And Patients’ Perspective: The Two Sides Of The Same Coin
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Kaitelidou, Dzzz, Baret, C, Konstantakopoulou, O, Zafiropoulou, M, Theodorou, M, Siskou, O, Kalafati, M, Chatzopoulou, M, Karra, V, Delloro, G, Patiraki, Ε, Lemonidou, C, and Sourtzi, P
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- 2017
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13. DNA damage and repair efficiency in lymphocytes from schizophrenic patients
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Psimadas, D Messini-Nikolaki, N Zafiropoulou, M Fortos, A and Tsilimigaki, S Piperakis, SM
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In the present study we examined schizophrenic patients’ lymphocytes sensitivity to the effects of external factors, such as hydrogen peroxide and gamma-irradiation and also their repair efficiency with the comet assay. Our results did no show any difference in basal levels of DNA damage between schizophrenic and normal populations. The slightly increased sensitivity of the schizophrenic population to the externally induced DNA damage compared to controls was not statistically significant. Also the small reduction in the DNA repair efficiency in schizophrenics in comparison to normal population was found to be not statistically significant. Finally, patients with heritable predisposition to schizophrenia did not show any difference in their response from the other schizophrenics. (C) 2003 Elsevier Ireland Ltd. All rights reserved.
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- 2004
14. DNA damage in a human population affected by chronic psychogenic stress
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Dimitroglou, E Zafiropoulou, M Messini-Nikolaki, N and Doudounakis, S Tsilimigaki, S Piperakis, SM
- Abstract
The effects of chronic psychogenic stress on the expression of DNA damage and cellular response to the damage were investigated. Using the comet assay, basal DNA damage was found to be similar in lymphocytes of both affected and non-affected Populations (n = 30 in both groups). The induction of DNA damage in lymphocytes by external factors (H2O2 and gamma-irradiation), was also investigated. In these Studies, cells were treated with 50, 100 and 150 muM H2O2 for 5 minutes or with 0.8, 2.5 and 4.2 Gy gamma-rays. A significant difference was found between the chronically stressed and the control populations, indicating the enhanced sensitivity of the former population. Cells were also held for 2 hours after the treatment, allowing time for the cells to deal with the induced DNA damage. Based on the level of residual DNA strand breaks, cells from the stressed population had more breaks than the controls. Gender does not alter these findings. In conclusion, our data indicate that cells from the stressed population were more sensitive to the induction of DNA damage and had higher level of residual damage. Therefore, stress conditions may cause the affected individuals to be susceptible to environmental mutagenic agents.
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- 2003
15. New forms of motherhood: The reaction of new teachers
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Sidiropoulou, T., primary, Zafiropoulou, M., additional, Soulele, S., additional, Antonarou, A., additional, and Peyoglou, S., additional
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- 2010
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16. Dietary Habits of Greek Primary School Children
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Piperakis, S. M., primary, Papadimitriou, V., additional, Zafiropoulou, M., additional, Piperakis, A. S., additional, and Zisis, P., additional
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- 2006
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17. Relation of self-concept in kindegarten and first grade to school adjustment.
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Zafiropoulou M, Sotiriou A, and Mitsiouli V
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- 2007
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18. A survey of Greek elementary school students' smoking habits and attitudes.
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Piperakis SM, Karagouni-Areou F, Triga A, Piperakis AS, Argyracouli E, Thanou A, Papadimitriou B, Gourgoulianis K, and Zafiropoulou M
- Abstract
The purpose of this study was to investigate the smoking habits of Greek elementary school students, their attitudes towards smoking, and their perceptions of the health consequences of tobacco use. Data were obtained from 1,092 elementary school students who completed a 24-item questionnaire designed for this study. Results indicated more older students smoked than younger ones and boys significantly outnumbering girls. Most of the students believed that people smoke for pleasure and relaxation or due to psychological problems and that people do not smoke primarily because of health or aesthetic reasons (smelling badly). Students' attitudes towards smoking were significantly related to their parents' educational status or the students' smoking behavior. Furthermore, students' negative attitude towards smoking was strongly associated with their age. Finally, it was found that age and parental educational status affected students' knowledge of the health effects of tobacco use. [ABSTRACT FROM AUTHOR]
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- 2007
19. ‘Preparedness’ and the severity and outcome of clinical phobias
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Zafiropoulou, M., primary and McPherson, F.M., additional
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- 1986
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20. Socio-Healthcare for Older People in the Mediterranean Basin: An Integrative Review and Quality Appraisal.
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Porcel-Gálvez AM, Allande-Cussó R, Fadden IM, Ferentinou E, Zafiropoulou M, and Lima-Serrano M
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- Humans, Aged, Mediterranean Region, Female, Aged, 80 and over, Male, Health Services for the Aged standards, Patient-Centered Care standards
- Abstract
Objectives: The aging Mediterranean Basin population presents complex challenges for healthcare systems, which require innovative care approaches. The study aimed to critically assess 19 socio-healthcare practices in the Mediterranean Basin that target the elderly population by analyzing their theoretical foundations, integration of care services, ethical considerations, gender-specific approaches, and use of technology., Design: An integrative literature review was conducted using a structured methodology., Sample: Diverse sources across multiple languages were searched, with the inclusion criteria focusing on the alignment of socio-healthcare practices with the components of the nursing metaparadigm, the incorporation of transversal values, and relevance to the elderly population., Results: The socio-healthcare practices exhibited common themes, such as person-centered care, interdisciplinary collaboration, and incorporation of technology for coordinated care delivery. Ethical principles of autonomy, dignity, and respect were central, with some socio-healthcare practices addressing gender-specific care needs. Evidence-based findings emphasized holistic care, integration, ethics, and innovation in elderly socio-healthcare., Conclusions: New eldercare frameworks should integrate these aspects, which offer a comprehensive approach to addressing the complex needs of elderly patients. Managers should design systems prioritizing patient well-being, whereas policymakers should develop equitable and high-quality care policies that collectively improve the well-being of the elderly population in the Mediterranean Basin., (© ([0‐9]+) Wiley Periodicals LLC.)
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- 2025
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21. The Effect of Touch-Cure Polymerization on the Conversion and Hardness of Core Build-Up Resin Composites: A Laboratory Study.
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Dimitriadi M, Petropoulou A, Masouras K, Zafiropoulou M, Zinelis S, and Eliades G
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To improve the self-curing capacity and interfacial strength with dentine of dual-cured composite materials, touch-cure activators have been introduced. The aim of the study was to evaluate the effect of these activators on the hardness and conversion of dual-cured resin composite core build-up restoratives. The materials tested were Clearfil DC Core Plus (CF) and Gradia Core (GC) with the corresponding adhesives Clearfil S
3 Bond Plus (for CF) and G-Premio Bond/G-Premio DCA activator (for GC). Disk-shaped specimens (n = 6/group) were prepared for the following groups: dual-cured, self-cured and self-cured in contact with the adhesive activators at the bottom surface. After a 3-week storage period (dark/dry/37 °C) the Martens hardness (HM) and degree of conversion (DC%) were determined for the previously mentioned groups and the top surfaces of groups in contact with the adhesives. A statistical analysis was performed by a one-way ANOVA and Holm-Sidak test per material and a Pearson's correlation analysis (HM vs. DC%) at an α = 0.05. The self-cured specimens resulted in significantly lower HM and DC% values from the dual-cured group, as expected. However, in the presence of the adhesives with touch-cure activators, the conversion of the self-cured groups showed insignificant differences in HM and DC% from the dual-cured in both composite materials. The improvements on the bottom composite surfaces in contact with the adhesives did not extend to the entire specimen length. Nevertheless, improved interfacial curing may improve interfacial durability.- Published
- 2021
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22. Self-Etch Silane Primer: Reactivity and Bonding with a Lithium Disilicate Ceramic.
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Dimitriadi M, Zinelis S, Zafiropoulou M, Silikas N, and Eliades G
- Abstract
The aim of the study was to evaluate the stability, reactivity, and bond strength with a lithium disilicate ceramic of a self-etch silane primer (Monobond Etch and Prime/MEP). The stability was evaluated by
1 H-,31 P-NMR spectroscopy (before/after aging), and the reactivity by micro MIR-FTIR spectroscopy on Ge surfaces (0, 1, 24 h) using a prehydrolyzed silane primer (Calibra Silane Coupling Agent/CLB), as a control. The effect of MEP vs. 5% HF-etching on ceramic roughness was assessed by optical profilometry. The shear bond strength (SBS) of a resin composite bonded to polished ceramic surfaces treated with MEP, HF without silane (HF+NS), HF+CLB, and HF+MEP (n = 20) was evaluated after storage in water (A: 37 °C/1 week, B: 5000×/5-55 °C and C: 100 °C/24 h). Aging did not affect the silanol groups of MEP, but only the phosphate co-monomer. Silanols were reactive forming siloxanes, but exhibited lower consumption rate than CLB. HF-etching induced significantly higher values than MEP, in all the roughness parameters tested (Sa, Sz, Sdr, Sc, Sv), with the greatest differences found in Sdr and Sv. For SBS, MEP was inferior to all treatments/storage conditions, except of HF+NS in A, where the values were similar. However, on a HF-etched substrate, MEP provided highest strength and reliability.- Published
- 2020
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23. Silane reactivity and resin bond strength to lithium disilicate ceramic surfaces.
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Dimitriadi M, Zafiropoulou M, Zinelis S, Silikas N, and Eliades G
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- Ceramics, Dental Porcelain, Hydrofluoric Acid, Materials Testing, Resin Cements, Shear Strength, Surface Properties, Dental Bonding, Silanes
- Abstract
Objective: To evaluate the silane status in commercially available products and their bonding capacity with polished glass-ceramic surfaces before and after hydrofluoric (HF) acid-etching., Methods: The products tested were Calibra Silane Coupling Agent/CS, G-Multi Primer/GM, Kerr Silane Primer/KS, Monobond Plus/MB and Scotchbond Universal Adhesive/SB. The silane status was studied by
13 C nuclear magnetic resonance spectroscopy (13 C-NMR). The roughness parameters of polished (group A) and HF acid-etched (group B) lithium disilicate glass-ceramic surfaces were measured by optical profilometry (n = 5/group). The interaction of the products with group A and B ceramic surfaces was examined by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). The shear strength (SBS) of a flowable composite bonded to the ceramic surfaces (groups A, B) was assessed before (NS) and after silane treatment (n = 20/group, product)., Results: The NMR analysis showed the presence of silanol monomers only in CS. Methoxylated-siloxane adducts were found in GM, silanol-siloxane adducts in MB, SB, and siloxane polymers in KS. Acid-etching greatly increased Sa, Sz, Sdr, Sc and Sv parameters (p < 0.001) and ATR-FTIR analysis demonstrated evidence of bonding with the substrate in CS. Weibull analysis of SBS revealed the following rankings in characteristic life (p < 0.05): CS > SB,KS,MB > GM > NS (group A) and CS > GM > SB,KS,MB,NS (group B). The most reliable treatment in both groups was CS. For the same silane treatment, the SBS of group B were significantly higher from group A. Failures were mainly of adhesive type, except of several partial resin cohesive failures found in group B., Significance: The chemical bonding capacity of the silanes was highest in products with silanol monomers. Acid-etching increased bond strength to a level that neutralized the silane contribution in products with silanol-siloxane adducts and siloxane polymers, providing thus bond strength values similar to silane-free treatments., (Copyright © 2019 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved.)- Published
- 2019
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24. Reactivity and Bond Strength of Universal Dental Adhesives with Co-Cr Alloy and Zirconia.
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Papadogiannis D, Dimitriadi M, Zafiropoulou M, Gaintantzopoulou MD, and Eliades G
- Abstract
The aim of this study was to evaluate (a) the reactivity of six universal dental adhesives with polished cobalt-chrome (Co-Cr) alloy and zirconia (3Y-TZP) surfaces; and (b) to assess the shear bond strength (SBS) of a resin composite with polished and alumina-blasted surfaces as mediated by these adhesives. The products tested were Adhese Universal (AD), All-Bond Universal (AB), Clearfill Universal Bond (CB), G-Premio Bond (GP), Prelude One (PO) and Scotchbond Universal (SB). The reactivity on polished substrates was evaluated by reflection infrared microscopy (RFTIRM). The roughness parameters of polished and 50 μm alumina grit-blasted surfaces were assessed by optical profilometry. The SBS of the composite bonded to the substrates treated with each adhesive (n = 10/product) was evaluated after 1 week of storage (H
2 O/37 °C) by Weibull statistics. Evidence of phosphate interaction with polished substrates was obtained by FTIRM, with higher peaks on the alloy. Alumina-blasting increased all roughness parameters with higher values on the alloy. AD, CB were the strongest ( σ0 ) treatments on alloy surfaces and AD, CB, AB, SB on zirconia. GP was the weakest on both substrates and the least reliable ( β ) on alloy. On polished alloy GP, PO performed better ( σ0 ), whereas on zirconia there were no significant differences. All adhesives showed more prominent reaction with the Co-Cr alloy than with 3Y-TZP.- Published
- 2019
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25. Universal Adhesives: Setting Characteristics and Reactivity with Dentin.
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Papadogiannis D, Dimitriadi M, Zafiropoulou M, Gaintantzopoulou MD, and Eliades G
- Abstract
The aim of the study was to evaluate the performance of six commercially available universal dental adhesives: Adhese Universal (ADU), All-Bond Universal (ABU), Clearfil Universal Bond Quick (CBQ), G-Premio Bond (GPB), Prelude One (PRO) and Scotchbond Universal (SBU). The properties tested were: (a) degree of C=C conversion (DC%); (b) Vickers micro-hardness (VHN); (c) extent of oxygen inhibition (OI/μm), all related with the adhesive film properties; (d) extent of dentin demineralisation (DM%), insoluble salt formation (AS%); and (e) shear bond strength (SBS, self-etch mode) related to the adhesive-dentin interactions. Statistical analysis (α = 0.05) was performed by one-way ANOVA and Tukey's test (DC%, VHN, OI, DM% AS%) and Weibull analysis (SBS, σ
0- β ). The DC ranged from 67.2-82.5% (all >GPB), OI from 5.6-18.6 μm (SBU > ADU, GPB, ABU > CBQ > PRO), microhardness from 1.1-6.6 VHN (SBU > ADU > ABU > CBQ > PRO > GPB: not measurable), DM from 69.3% (GPB) to 16-12.5% (CBQ, SBU, ADU) and 13.2-10.6% (ABU, ADU, PRO), in homogeneous groups and AS from 26-15.9% (ABU, CBQ > GPB, PRO, ADU, SBU). For SBS the σ0 (characteristic life) ranged from 29.3-16.6 MPa (CBQ, ADU, ABU, SBU > PRO > GPB), the β (reliability) from 5.1-9.7 ( p > 0.05). All failure modes were of mixed type (adhesive and composite cohesive). Although all these adhesives were based on the 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) adhesive monomer, the different co-monomers, solvents and catalysts led to variations in their film properties, reactivity and bonding capacity with dentin.- Published
- 2019
- Full Text
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26. The stigmatization of obesity in children. A survey in Greek elementary schools.
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Koroni M, Garagouni-Areou F, Roussi-Vergou CJ, Zafiropoulou M, and Piperakis SM
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- Child, Children with Disabilities psychology, Female, Greece, Humans, Male, Sex Factors, Obesity psychology, Prejudice
- Abstract
This study investigates elementary school children's prejudice towards obesity. A sample of 1861 underweight, normal, overweight and obese children from Central Greece were instructed to rank 6 drawings of same sex children with various physical disabilities, obesity or no disability at all ("healthy"), according to how much they liked each child. Results showed that all participants ranked the obese child last, showing that even obese individuals show negative attitudes towards obesity. Gender differences were recorded in almost all the drawings. Girls liked obese children and those with facial disfigurement less than boys did while boys disliked children with physical disabilities more than girls.
- Published
- 2009
- Full Text
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27. Parental bonding and depression: personality as a mediating factor.
- Author
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Avagianou PA and Zafiropoulou M
- Subjects
- Adolescent, Adult, Father-Child Relations, Female, Humans, Male, Middle Aged, Mother-Child Relations, Personality Development, Young Adult, Depression psychology, Mental Health, Parent-Child Relations, Personality
- Abstract
Unlabelled: According to Bowlby's theory of attachment, the role of early experience and parenting is of crucial importance to child development and mental health. In addition, several research findings suggest that parental bonding and different types of attachment play a crucial role in personality development. The present study examines the association between parental bonding experiences (lack of parental care, overprotection or both) and depression during adulthood. The objective of the present study was to evaluate different personality dimensions as possible mediators of the relation between perceptions of parental bonding and depressive symptoms in adult life., Methods: 181 participants (15- 49-years-old) completed the Parental Bonding Instrument (PBI), the Beck Depression Inventory (BDI) and the 16 Personality Factor Questionnaire (16PF)., Results: The results show that lack of parental care and overprotection is linked with depressive symptoms and a number of personality characteristics, such as low self-esteem, introversion, distress and emotional instability. In contrast, high care and low protection (optimal bonding) is linked with increased self-confidence, less distress and less depressive symptoms., Conclusions: The results presented here are in line with Bowlby's theory of attachment and show that parental bonding is linked with problematic personality development and psychopathology. The present study provided evidence that personality factors may mediate the observed relationship between parental rearing style and depression. The potential causal mechanisms warrant longitudinal evaluation.
- Published
- 2008
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28. Qualitative analysis of experiences of members of a psychoeducational assertiveness group.
- Author
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Argyrakouli E and Zafiropoulou M
- Subjects
- Adolescent, Adult, Female, Humans, Male, Surveys and Questionnaires, Assertiveness, Attitude, Counseling, Group Processes, Psychotherapy methods, Self Concept
- Abstract
This study describes qualitatively a psychoeducational assertiveness intervention for 20 women's perceptions of positive and negative experiences, undertaken to identify whether therapeutic mechanisms operating in group therapy as described by Yalom might be inferred. There were 14 90-min. weekly sessions organized around educational material. Two groups were conducted with 10 university women each (M= 20.9 yr., SD= 1.9). Qualitative analysis of the 20 interviews identified five of Yalom's therapeutic mechanisms, namely, self-understanding, universality, acceptance, catharsis, and self-disclosure. The positive experiences were group cohesiveness, self-understanding, self-disclosure, positive views about the self and learning, and cognitive benefits. Self-disclosing at the early stages of group development was the most frequently reported negative experience or difficulty in the group. Although participants stated they improved interpersonal communication skills, analysis suggested the cultural context was an important mediator of assertive behavior.
- Published
- 2007
- Full Text
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29. Laying the foundations of well being: a creative psycho-educational program for young children.
- Author
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Zafiropoulou M and Thanou A
- Subjects
- Child, Child, Preschool, Female, Humans, Male, Play and Playthings, Surveys and Questionnaires, Underachievement, Adjustment Disorders prevention & control, Health Education, Mental Health, Program Development, Quality of Life psychology
- Abstract
Dysfunctional cognitive schemata and pessimistic explanatory styles are usually held responsible for some of the commonest features of depressed mood such as feelings of meaninglessness, resignation, and underachievement which seem to affect even young children. This pilot study investigates the applicability and efficacy of an interactive, creative psycho-educational program for preschoolers that aims at enhancing mastery and shaping optimistic explanatory styles. Twenty preschoolers participated in once-a-week hourly sessions which took place in their school and lasted for one school year. The intervention consisted of several playful tasks and novel creative activities specially designed to meet the needs and abilities of preschoolers, while satisfying the objectives of the school curriculum. The tasks were based on the principles of cognitive behaviour theory. Qualitative and quantitative analyses of our results support the efficacy of the intervention for preschoolers.
- Published
- 2007
- Full Text
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30. A cognitive-behavioral intervention program for students with special reading disabilities.
- Author
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Zafiropoulou M and Mati-Zissi H
- Subjects
- Child, Feedback, Female, Humans, Male, Reinforcement, Psychology, Relaxation, Students, Surveys and Questionnaires, Cognitive Behavioral Therapy methods, Dyslexia therapy
- Abstract
Interaction among cognitive, meta-cognitive, and emotional factors seems to play a determining part in achievement behavior and especially in scholastic performance. In this study some preliminary results are presented of the implementation of a multidimensional cognitive-behavioral psychoeducational program especially designed for students with reading disabilities in which parents and teachers also take part. The aim of the program was to provide students with appropriate emotional and cognitive skills with which to address their learning problems. First results on the efficacy of the implemented program to 20 primary school boys and girls with special reading disabilities encourage research on management of learning problems with focus on cognitive and emotional aspects in which parents and teachers contribute. Research including a control group is necessary.
- Published
- 2004
- Full Text
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31. DNA damage and repair efficiency in lymphocytes from schizophrenic patients.
- Author
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Psimadas D, Messini-Nikolaki N, Zafiropoulou M, Fortos A, Tsilimigaki S, and Piperakis SM
- Subjects
- Adult, Case-Control Studies, Comet Assay, DNA drug effects, DNA radiation effects, Female, Gamma Rays, Humans, Hydrogen Peroxide pharmacology, Lymphocytes drug effects, Lymphocytes radiation effects, Male, DNA Damage physiology, DNA Repair physiology, Lymphocytes metabolism, Schizophrenia blood
- Abstract
In the present study we examined schizophrenic patients' lymphocytes sensitivity to the effects of external factors, such as hydrogen peroxide and gamma-irradiation and also their repair efficiency with the comet assay. Our results did no show any difference in basal levels of DNA damage between schizophrenic and normal populations. The slightly increased sensitivity of the schizophrenic population to the externally induced DNA damage compared to controls was not statistically significant. Also the small reduction in the DNA repair efficiency in schizophrenics in comparison to normal population was found to be not statistically significant. Finally, patients with heritable predisposition to schizophrenia did not show any difference in their response from the other schizophrenics.
- Published
- 2004
- Full Text
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32. Visuomotor coordination and visuospatial working memory of children with specific reading disabilities: a study using the Rey-Osterrieth Complex Figure.
- Author
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Mati-Zissi H and Zafiropoulou M
- Subjects
- Child, Concept Formation, Discrimination Learning, Dyslexia psychology, Female, Humans, Male, Psychometrics, Psychomotor Disorders psychology, Reference Values, Dyslexia diagnosis, Memory, Short-Term, Motor Skills, Neuropsychological Tests, Orientation, Pattern Recognition, Visual, Psychomotor Disorders diagnosis, Psychomotor Performance
- Abstract
The aim of the present study was to examine the visuospatial perception, short-term working memory, and motor skills of children with special reading difficulties, using the Rey-Osterrieth Complex Figure, which can record visuomotor and memory skills, observe drawing processes, and detect deficiencies in specific skills. 306 right- and left-handed boys and girls, ages 6.6 to 9.6 yr. (102 with special reading difficulties, 102 normal readers, and 102 with general learning difficulties) comprised one experimental and two control groups, respectively. The task was to depict the Rey-Osterrieth Complex Figure under two conditions, copying and drawing it from memory. Analysis indicated that (a) difficulty of the depiction of the Rey-Osterrieth Complex Figure, especially from memory, sharply affects children's performance and (b) the experimental group's performance was significantly poorer than that of controls in both conditions. The results are discussed in view of the predictive value of certain motor and cognitive skill deficiencies of children with special reading difficulties.
- Published
- 2003
- Full Text
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33. DNA damage in a human population affected by chronic psychogenic stress.
- Author
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Dimitroglou E, Zafiropoulou M, Messini-Nikolaki N, Doudounakis S, Tsilimigaki S, and Piperakis SM
- Subjects
- Adult, Cell Culture Techniques, Comet Assay, Female, Humans, Lymphocytes, Male, DNA Damage, Stress, Psychological
- Abstract
The effects of chronic psychogenic stress on the expression of DNA damage and cellular response to the damage were investigated. Using the comet assay, basal DNA damage was found to be similar in lymphocytes of both affected and non-affected populations (n = 30 in both groups). The induction of DNA damage in lymphocytes by external factors (H2O2 and gamma-irradiation), was also investigated. In these studies, cells were treated with 50, 100 and 150 microM H2O2 for 5 minutes or with 0.8, 2.5 and 4.2 Gy gamma-rays. A significant difference was found between the chronically stressed and the control populations, indicating the enhanced sensitivity of the former population. Cells were also held for 2 hours after the treatment, allowing time for the cells to deal with the induced DNA damage. Based on the level of residual DNA strand breaks, cells from the stressed population had more breaks than the controls. Gender does not alter these findings. In conclusion, our data indicate that cells from the stressed population were more sensitive to the induction of DNA damage and had higher level of residual damage. Therefore, stress conditions may cause the affected individuals to be susceptible to environmental mutagenic agents.
- Published
- 2003
- Full Text
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34. Drawing performance in prediction of special learning difficulties of kindergarten children.
- Author
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Mati-Zissi H and Zafiropoulou M
- Subjects
- Child, Child, Preschool, Female, Humans, Male, Predictive Value of Tests, Verbal Behavior, Child Day Care Centers, Learning Disabilities diagnosis, Projective Techniques
- Abstract
Recent experimental studies indicate the importance of drawing process in determining the final shape of the drawn product. Emphasis has been given on short-term and working memory, visual perception, visuospatial encoding, planning, sequencing, and depiction of the third dimension. The above prerequisites are also necessary for the acquisition of reading and spelling. The aim of the present study was to investigate the prereading and drawing abilities of kindergarten children. 20 boys and girls were selected from 1,237 kindergarten children, based on their performance on a set of drawing tasks. The drawings were used as tools to indicate the conditions under which deficiencies in the cognitive system become apparent. Those 20 children and 20 matched controls were again tested during their first three years in primary school. The reassessment on the first and third year included tasks on drawing as well as on reading and spelling (speed and accuracy) based on the curriculum. The results showed an effect of the same cognitive factors in both areas of knowledge. The cognitive deficiencies observed across tasks focused on the children's information processing and were apparent in both symbolic systems.
- Published
- 2001
- Full Text
- View/download PDF
35. Drawing performance in children with special learning difficulties.
- Author
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Mati-Zissi H, Zafiropoulou M, and Bonoti F
- Subjects
- Analysis of Variance, Child, Dyslexia psychology, Female, Humans, Learning Disabilities psychology, Male, Motor Skills, Dyslexia diagnosis, Learning Disabilities diagnosis, Psychomotor Performance, Writing
- Abstract
The present study examined drawings on 5 tasks of 45 dyslexic and 45 nondyslexic children aged 6-9 years old. Children who show low performance in written language and phonological awareness are also expected to get low scores on drawing tasks which require similar skills such as comprehension of difference, coordination of parts in an organized whole, spatial movement, classification or distinction of figures. The present hypotheses were constructed accordingly. Analysis showed that the drawings of the dyslexic participants presented inadequate planning, difficulties in the depiction of contrast, size-scaling and canonicality, lack of details, and stereotypic depiction.
- Published
- 1998
- Full Text
- View/download PDF
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