Biomedical Sciences and Comprehensive Care (Dentistry) Works
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Item Influence of toothbrush abrasion and surface treatments on the color and translucency of resin infiltrated hybrid ceramics(The Korean Academy of Prosthodontics, 2021) Labban, Nawaf; Al Amri, Mohammad; Alhijji, Saleh; Alnafaiy, Sarah; Alfouzan, Afnan; Iskandar, Mounir; Feitosa, Sabrina; Biomedical Sciences and Comprehensive Care, School of DentistryPurpose: The study compared the color change, lightness, and translucency of hybrid resin ceramics exposed to toothbrush abrasion and surface treatment. Materials and methods: Four hybrid ceramics [Lava Ultimate (LU), Vita Enamic (EN), Shofu HC (SH), and Crystal Ultra (CU)] were compared with a glass-ceramic (Vita Mark II) control. One hundred and twenty specimen blocks were prepared using a precision saw machine. Specimens in each material were divided into four subgroups based on the surface treatment (polishing or staining) and a storage medium (water or citric acid). Simulated tooth brushing with a mixture of 100 RDA (radioactive abrasives) with 0.3 ml distilled water was used for 3650 cycles (7300 strokes) for each specimen. Measurements for the color change, lightness, and translucency were measured after toothbrushing using a spectrophotometer. Statistical analysis compared outcomes using paired t-test, ANOVA, and Tukey post hoc test. Results: The maximum color change was identified in SH (stained acid) [1.44 (0.40)], whereas the lowest was identified in EN (polished water) [0.66 (0.16)] material. The maximum and minimum loss of surface translucency was observed in SH (polished water) [12.3 (0.52)] and EN (stained acid) [6.5 (0.55)] specimens, respectively. Lastly, loss of lightness was the highest in VM (polished acid) [69 (0.95)], whereas the lowest was observed in CU (stained water) [56.7 (0.86)]. Conclusion: The comparison presented a significant effect of toothbrush abrasion on translucency and lightness of the hybrid resin ceramics. Color change was not significantly influenced irrespective of the storage medium employed. Surface staining demonstrated the preservation and stability of color and optical properties under the influence of toothbrush abrasion and chemical trauma.Item Inhibitory effect of Porphyromonas gingivalis-derived phosphoethanolamine dihydroceramide on acid ceramidase expression in oral squamous cells(Wiley, 2023-05) Yamada, Chiaki; Ho, Anny; Nusbaum, Amilia; Xu, Ruijuan; Davey, Mary Ellen; Nichols, Frank; Mao, Cungui; Movila, Alexandra; Biomedical Sciences and Comprehensive Care, School of DentistryThe maintenance of diminished acid ceramidase (ASAH1) gene expression leading to the accumulation of antiproliferative intracellular ceramides in oral squamous cell carcinoma (OSCC) has emerged as a prospective oral cancer therapeutic regimen. Our published study demonstrated that the key periodontal pathogen Porphyromonas gingivalis downregulates the expression patterns of ASAH1 mRNA in normal epithelial cells in vitro. Therefore, P. gingivalis may also beneficially diminish the expression of ASAH1 in OSCC. Because a uniquely structured P. gingivalis-derived phosphoethanolamine dihydroceramide (PEDHC) inhibits the proliferation of normal human fibroblasts, this study aimed to test the effect of PEDHC on the survival of human oral squamous OECM-1 cells in vitro. We demonstrated that the P. gingivalis dihydroceramide-null (ΔPG1780) strain upregulates the expression of ASAH1 mRNA and promotes aggressive proliferation and migration of OECM-1 cells compared to the parent P. gingivalis-W83 strain. In addition, the intracellular concentration of ceramides was dramatically elevated in OECM-1 cells exposed to PEDHC in vitro. Furthermore, PEDHC inhibited expression patterns of ASAH1 mRNA as well as some genes associated with degradation of the basement membranes and extracellular matrix, for example, MMP-2, ADAM-17 and IL-6, in OECM-1 cells. Altogether, these data indicated that PEDHC produced by P. gingivalis inhibits acid ceramidase expression, promotes intracellular ceramide accumulation and suppresses the survival and migration of OSCC cells in vitro. Further studies are needed to determine molecular mechanisms of PEDHC-mediated inhibitory effect(s) on OSCC using in vivo models of oral cancer.Item Maternal antibiotic administration during gestation can affect the memory and brain structure in mouse offspring(Frontiers Media, 2023-05-10) Shepilov, Dmytro; Osadchenko, Iryna; Kovalenko, Tetiana; Yamada, Chiaki; Chereshynska, Anastasiia; Smozhanyk, Kateryna; Ostrovska, Galyna; Groppa, Stanislav; Movila, Alexandru; Skibo, Galyna; Biomedical Sciences and Comprehensive Care, School of DentistryMaternal antibiotics administration (MAA) is among the widely used therapeutic approaches in pregnancy. Although published evidence demonstrates that infants exposed to antibiotics immediately after birth have altered recognition memory responses at one month of age, very little is known about in utero effects of antibiotics on the neuronal function and behavior of children after birth. Therefore, this study aimed to evaluate the impact of MAA at different periods of pregnancy on memory decline and brain structural alterations in young mouse offspring after their first month of life. To study the effects of MAA on 4-week-old offspring, pregnant C57BL/6J mouse dams (2-3-month-old; n = 4/group) were exposed to a cocktail of amoxicillin (205 mg/kg/day) and azithromycin (51 mg/kg/day) in sterile drinking water (daily/1 week) during either the 2nd or 3rd week of pregnancy and stopped after delivery. A control group of pregnant dams was exposed to sterile drinking water alone during all three weeks of pregnancy. Then, the 4-week-old offspring mice were first evaluated for behavioral changes. Using the Morris water maze assay, we revealed that exposure of pregnant mice to antibiotics at the 2nd and 3rd weeks of pregnancy significantly altered spatial reference memory and learning skills in their offspring compared to those delivered from the control group of dams. In contrast, no significant difference in long-term associative memory was detected between offspring groups using the novel object recognition test. Then, we histologically evaluated brain samples from the same offspring individuals using conventional immunofluorescence and electron microscopy assays. To our knowledge, we observed a reduction in the density of the hippocampal CA1 pyramidal neurons and hypomyelination in the corpus callosum in groups of mice in utero exposed to antibiotics at the 2nd and 3rd weeks of gestation. In addition, offspring exposed to antibiotics at the 2nd or 3rd week of gestation demonstrated a decreased astrocyte cell surface area and astrocyte territories or depletion of neurogenesis in the dentate gyrus and hippocampal synaptic loss, respectively. Altogether, this study shows that MAA at different times of pregnancy can pathologically alter cognitive behavior and brain development in offspring at an early age after weaning.Item Inhibitory effect of Porphyromonas gingivalis-derived phosphoethanolamine dihydroceramide on acid ceramidase expression in oral squamous cells(Wiley, 2023) Yamada, Chiaki; Ho, Anny; Nusbaum, Amilia; Xu, Ruijuan; Davey, Mary Ellen; Nichols, Frank; Mao, Cungui; Movila, Alexandru; Biomedical Sciences and Comprehensive Care, School of DentistryThe maintenance of diminished acid ceramidase (ASAH1) gene expression leading to the accumulation of antiproliferative intracellular ceramides in oral squamous cell carcinoma (OSCC) has emerged as a prospective oral cancer therapeutic regimen. Our published study demonstrated that the key periodontal pathogen Porphyromonas gingivalis downregulates the expression patterns of ASAH1 mRNA in normal epithelial cells in vitro. Therefore, P. gingivalis may also beneficially diminish the expression of ASAH1 in OSCC. Because a uniquely structured P. gingivalis-derived phosphoethanolamine dihydroceramide (PEDHC) inhibits the proliferation of normal human fibroblasts, this study aimed to test the effect of PEDHC on the survival of human oral squamous OECM-1 cells in vitro. We demonstrated that the P. gingivalis dihydroceramide-null (ΔPG1780) strain upregulates the expression of ASAH1 mRNA and promotes aggressive proliferation and migration of OECM-1 cells compared to the parent P. gingivalis-W83 strain. In addition, the intracellular concentration of ceramides was dramatically elevated in OECM-1 cells exposed to PEDHC in vitro. Furthermore, PEDHC inhibited expression patterns of ASAH1 mRNA as well as some genes associated with degradation of the basement membranes and extracellular matrix, for example, MMP-2, ADAM-17 and IL-6, in OECM-1 cells. Altogether, these data indicated that PEDHC produced by P. gingivalis inhibits acid ceramidase expression, promotes intracellular ceramide accumulation and suppresses the survival and migration of OSCC cells in vitro. Further studies are needed to determine molecular mechanisms of PEDHC-mediated inhibitory effect(s) on OSCC using in vivo models of oral cancer.Item Release and MMP-9 Inhibition Assessment of Dental Adhesive Modified with EGCG-Encapsulated Halloysite Nanotubes(MDPI, 2023-03-09) Alhijji, Saleh; Platt, Jeffrey A.; Alhotan, Abdulaziz; Labban, Nawaf; Bottino, Marco C.; Windsor, L. Jack; Biomedical Sciences and Comprehensive Care, School of DentistryDegradation of the collagen fibrils at the dentin-resin interface by the enzymatic activity of matrix metalloproteinases (MMPs) has been known to permit some dental restoration complications, such as microleakage, secondary caries, and, ultimately, restoration failures. This study aimed to evaluate a modified adhesive by adding an MMP inhibitor from green tea extract with and without nanotube encapsulation to sustain the drug release. Epigallocatechin-3-gallate (EGCG) and Halloysite nanotubes (HNTs) were prepared to produce three variant combinations of modified adhesive (EGCG, EGCG-encapsulated HNT, and EGCG-free HNT). The drug loading efficiency and EGCG release over time were evaluated using UV-vis spectrometry. MMP-mediated β-casein (BCN) cleavage rate assays were used to determine the ability of the EGCG in eluates of the adhesive to inhibit MMP-9 activities. For up to 8 weeks, HNT encapsulation reduced release to a statistically significant level. MMP-mediated β-casein cleavage rate assays showed a significant decrease for the EGCG groups compared to the non-EGCG adhesive groups. Furthermore, the use of HNT for EGCG encapsulation to modify a dental adhesive helped slow down the rate of EGCG release without impacting its MMP inhibitory capabilities, which may help to maintain the dentin-resin interface's integrity over the long term after dental restoration placement.Item Editorial: A new frontier in translational research on autoinflammatory diseases - various aspects of innate immunity on human diseases(Frontiers Media, 2023-01-31) Mukai, Tomoyuki; Ida, Hiroaki; Ueki, Yasuyoshi; Nishikomori, Ryuta; Biomedical Sciences and Comprehensive Care, School of DentistryItem Dissecting the Spectrum of Stroke Risk Factors in an Apparently Healthy Population: Paving the Roadmap to Primary Stroke Prevention(MDPI, 2023-01-20) Efremova, Daniela; Ciolac, Dumitru; Zota, Eremei; Glavan, Danu; Ciobanu, Natalia; Aulitzky, Wolfgang; Nics, Anna Maria; Trinka, Eugen; Yamada, Chiaki; Movila, Alexandru; Groppa, Stanislav A.; Biomedical Sciences and Comprehensive Care, School of DentistryWe aimed to investigate, for the first time, the spectrum of stroke risk factors specific to the population of the Republic of Moldova. The subjects were examined according to a pre-established protocol of risk factor estimation. The study involved 300 subjects, including 60% women and 40% men, with a mean age of 49.9 ± 14.5 years. The most common risk factor was abdominal obesity, identified in 75% of subjects; general obesity was detected in 48%, while 32% of subjects were overweight and 20% were normally weighted. Hypertension was observed in 44%; 8% of those examined had atrial fibrillation, and 9% had diabetes mellitus. Left myocardial hypertrophy on ECG was present in 53% of subjects, and acute ischemic changes in 2%. Laboratory observations detected that glycosylated hemoglobin increased by 7%, and >50% had dyslipidemia. Total cholesterol was significantly elevated by 58%, LDL-cholesterol was increased by 32%, and HDL-cholesterol was decreased by 9%. Homocysteine was increased in 55% and high-sensitivity C-reactive protein in 28% of subjects. These results indicate the presence of modifiable risk factors and the necessity to elaborate on the primary prevention strategies aimed at minimizing the burden of stroke in the population of the Republic of Moldova.Item Bioactivity of Dental Restorative Materials: FDI Policy Statement(Elsevier, 2023) Schmalz, Gottfried; Hickel, Reinhard; Price, Richard Bengt; Platt, Jeffrey A.; Biomedical Sciences and Comprehensive Care, School of DentistryThe term bioactivity is being increasingly used in medicine and dentistry. Due to its positive connotation, it is frequently utilised for advertising dental restorative materials. However, there is confusion about what the term means, and concerns have been raised about its potential overuse. Therefore, FDI decided to publish a Policy Statement about the bioactivity of dental restorative materials to clarify the term and provide some caveats for its use in advertising. Background information for this Policy Statement was taken from the current literature, mainly from the PubMed database and the internet. Bioactive restorative materials should have beneficial/desired effects. These effects should be local, intended, and nontoxic and should not interfere with a material's principal purpose, namely dental tissue replacement. Three mechanisms for the bioactivity of such materials have been identified: purely biological, mixed biological/chemical, or strictly chemical. Therefore, when the term bioactivity is used in an advertisement or in a description of a dental restorative material, scientific evidence (in vitro or in situ, and preferably in clinical studies) should be provided describing the mechanism of action, the duration of the effect (especially for materials releasing antibacterial substances), and the lack of significant adverse biological side effects (including the development and spread of antimicrobial resistance). Finally, it should be documented that the prime purpose, for instance, to be used to rebuild the form and function of lost tooth substance or lost teeth, is not impaired, as demonstrated by data from in vitro and clinical studies. The use of the term bioactive dental restorative material in material advertisement/information should be restricted to materials that fulfil all the requirements as described in the FDI Policy Statement.Item Initial Efforts to Manage IPE during the COVID-19 Pandemic: Reports from the Big Ten Academic Alliance(NSUWorks, 2022) Smith, Laura J.; Romito, Laura; Congdon, Heather B.; Ascione, Frank J.; Fitzgerald, Mark; Karpa, Kelly; Pfiefle, Andrea; Sick, Brian; Khalili, Hossein; Biomedical Sciences and Comprehensive Care, School of DentistryPurpose: The COVID-19 pandemic required higher education institutions to quickly transition to a virtual platform. This was challenging for those involved in interprofessional education (IPE), given the goal that students from two or more professions learn about, from, and with one another. The Big Ten IPE Alliance is a subgroup of the larger Big Ten Academic Alliance. The purpose of this paper is to share the collective experiences of multiple large, research intensive universities in addressing the challenge of implementing IPE programs under the conditions established by the COVID-19 pandemic. Methods: To better understand how the Big Ten schools dealt with the transition to virtual learning for didactic and clinical IPE given the COVID-19 pandemic, a subset of representatives from the Big Ten IPE Alliance met to discuss best practices for virtual learning in the IPE realm. Each participating university completed an electronic 14 question survey related to their IPE curriculum during the COVID-19 pandemic from March 2020 thru August 2020 and the responses were analyzed. Results: Four categories were identified as needing to be addressed to develop and implement successful interprofessional didactic and clinical experiences. The categories identified included content/assessment, virtual technologies, faculty and facilitators, and learners. Conclusions/Recommendations: Consider including authentic and innovative mechanisms to deliver IPE experiences that meet the learning needs and accreditation requirements. Interinstitutional collaborations such as within the Big Ten IPE Alliance can be beneficial in assessing current and future best practices in IPE.Item Independence Scale for Daily Clinical Assessment(2020-01) Treat, TimothyThe IUSD Independence Scale allows faculty to document how much guidance a student received during each patient encounter. The scale ranges from Complete Guidance to Complete Independence (or No Guidance) based on the expectations of a newly licensed and practicing dentist. Following each patient encounter, this assessment is recorded directly into the evaluations module of the Electronic Health Record management system, axiUm.