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Mechanical analysis of conventional and small diameter conical implant abutments
Izabela Cristina Maurl′cio Moris,Adriana Cla′udia Lapria Faria,Maria da Gloria Chiarello de Mattos,Ricardo Faria Ribeiro,Renata Cristina Silveira Rodrigues 대한치과보철학회 2012 The Journal of Advanced Prosthodontics Vol.4 No.3
PURPOSE. The aim of the present study was to evaluate if a smaller morse taper abutment has a negative effect on the fracture resistance of implant-abutment connections under oblique compressive loads compared to a conventional abutment. MATERIALS AND METHODS. Twenty morse taper conventional abutments (4.8 mm diameter) and smaller abutments (3.8 mm diameter) were tightened (20 Ncm) to their respective implants (3.5 * 11 mm) and after a 10 minute interval, implant/abutment assemblies were subjected to static compressive test, performed in a universal test machine with 1 mm/min displacement, at 45 degree inclination. The maximum deformation force was determined. Data were statistically analyzed by student t test. RESULTS. Maximum deformation force of 4.8 mm and 3.8 mm abutments was approximately 95.33 kgf and 95.25 kgf, respectively, but no fractures were noted after mechanical test. Statistical analysis demonstrated that the evaluated abutments were statistically similar (P=.230). CONCLUSION. Abutment measuring 3.8 mm in diameter (reduced) presented mechanical properties similar to 4.8 mm (conventional) abutments, enabling its clinical use as indicated.
Jaqueline Correia Villac¸a,Luiz Cla´udio R. Pereira da Silva,Luisa Helena Falca˜o Barbosa,Carlos Rangel Rodrigues,Luiz Marcelo Lira,Fla´ via Almada do Carmo,Valeria Pereira de Sousa,Maria Ineˆs Bruno 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
The purpose of this study was to prepare and characterize lamellar silicate nanocomposites usingexfoliation processes, high clay load and polyvinylpyrrolidone (PVP), ethylcellulose (EC) andpolyquaternium-H (PQH). The clays (sodium montmorillonite, Viscogel S4TM, S7TM and B8TM) werepre-treated with ultrasonic energy in order to increase clay exfoliation yields. Polymeric nanocompositeswere characterized by XRPD, DSC, TGA, DLS and NMR. The results revealed a new exfoliationmethod and new intercalated nanocomposites. High clay load was used to obtain the nanocomposites,which enables its application at an industrial scale. These nanocomposites could be broadly appliedacross the pharmaceutical, medical and food industries.
Rosália Rubel,Herta S. Dalla Santa,Sandro J.R. Bonatto,Se´rgio Bello,Luiz Cla´udio Fernandes,Raffaello Di Bernardi,Juliana Gern,Cid Aimbire´ M. Santos,Carlos Ricardo Soccol 한국식품영양과학회 2010 Journal of medicinal food Vol.13 No.1
This study investigated the effect of Ganoderma lucidum supplementation on lymphocytes and peritoneal macrophages from mice. Our results show that G. lucidum in vivo was able to increase interferon-γ (IFN-γ) concentration but reduced CD3+ and CD8+ spleen lymphocytes. Ex vivo, IFN-γ; and interleukin-10 levels were increased and the tumor necrosis factor-α (TNF-α) level was reduced by peritoneal macrophages from mice fed with G. lucidum. In the absence of stimuli nitric oxide production was reduced in mice fed with G. lucidum, and with lipopolysaccharide stimulation nitric oxide production was increased but was lower than control values (P<.05). G. lucidum was grown by solid-state culture in wheat grain, and a chow containing 10% G. lucidum mycelium was formulated (G10). Swiss male mice were divided into two groups, termed G10 and control groups according to the diet, and were fed for 3 months. Peritoneal macrophages were obtained and investigated with regard to phagocytosis, lysosomal volume, hydrogen peroxide, superoxide anion, and cytokines ex vivo. In the plasma we investigated concentrations of cytokines, and in the spleen we determined subsets of CD3+, CD4+, CD8+, and CD19+ lymphocytes.
Ariane Leite Rozza,Thiago de Mello Moraes,Hélio Kushima,Domingos Sávio Nunes,Clélia Akiko Hiruma-Lima,Cla´udia Helena Pellizzon 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.9
This study aimed to evaluate the gastroprotective mechanism of action of the essential oil of Croton cajucara Benth. (Euphorbiaceae) stem bark in ethanol-induced gastric ulcers and its in vitro anti–Helicobacter pylori activity. The involvement of heat-shock protein-70, vasoactive intestinal peptide, glutathione, nitric oxide, and nonprotein sulfhydryl compounds in the gastroprotective effect was determined in male Wistar rats. The minimum inhibitory concentration against H. pylori was determined in vitro. The results were analyzed by analysis of variance followed by the Dunnett test, and a P value less than 0.05 was considered to represent a statistically significant difference. C. cajucara decreased ethanol-induced ulcer area in 100% of ulcers and decreased the histologic lesions. In the C. cajucara group, the area marked by heat-shock protein-70 was significantly higher than the area in the control group; this finding was not seen for vasoactive intestinal peptide. C. cajucara could not maintain glutathione levels close to those in the sham group. The gastric ulcer area of rats treated with the sulfhydryl compound blocker was decreased, but the ulcer area of rats treated with nitric oxide synthase inhibitor showed no alteration. The minimum inhibitory concentration obtained for C. cajucara was 125 μg/mL. These findings suggest that sulfhydryl compounds and heat-shock protein-70, but not nitric oxide, glutathione, or vasoactive intestinal peptide, are involved in the C. cajucara gastroprotective effect against ethanol-induced gastric ulcers.
Fares Zeida´n-Chulia,Mutlu Keskin,Eija Ko¨no¨nen,Veli-Jukka Uitto,Eva So¨derling,Jose´ Cla´udio Fonseca Moreira,Ulvi K. Gu¨rsoy 한국식품영양과학회 2015 Journal of medicinal food Vol.18 No.4
The present report examined the effects of essential oils (EOs) from Satureja hortensis L. and Salvia fruticosa M. on the viability and outer membrane permeability of the periodontopathogen Fusobacterium nucleatum, a key bacteria in oral biofilms, as well as the inhibition of matrix metalloproteinase (MMP-2 and MMP-9) activities in epithelial cells exposed to such bacteria. Membrane permeability was tested by measuring the N-phenyl-1-naphthylamine uptake and bacterial viability by using the commercially available Live/Dead BacLight kit. In addition, gelatin zymography was performed to analyze the inhibition of F. nucleatum-induced MMP-2 and MMP-9 activities in HaCaT cells. We showed that 5, 10, and 25 μL/mL of Sat. hortensis L. EO decreased the ratio of live/dead bacteria and increased the outer membrane permeability in a range of time from 0 to 5 min. Treatments with 10 and 25 μL/mL of Sal. fruticosa M. also increased the membrane permeability and 5, 10, and 25 μL/mL of both EOs inhibited MMP-2 and MMP-9 activities in keratinocytes induced after exposure of 24 h to F. nucleatum. We conclude that antibacterial and antigelatinolytic activities of Sat. hortensis L. EO have potential for the treatment of periodontal inflammation.
The Role of Resveratrol in Mild Cognitive Impairment and Alzheimer's Disease: A Systematic Review
Daiene Santos Buglio,Ledyane Taynara Marton,Lucas Fornari Laurindo,Elen Landgraf Guiguer,Adriano Cressoni Arau´jo,Roge´rio Leone Buchaim,Ricardo de Alvares Goulart,Cla´udio Jose´ Rubira,Sandra M. Barb 한국식품영양과학회 2022 Journal of medicinal food Vol.25 No.8
Advancing age is one of the risk factors for developing many diseases, including cancer, cardiovascular disorders, and neurodegenerative alterations, such as mild cognitive impairment (MCI), and Alzheimer's Disease (AD). Studies have indicated that supplementation with resveratrol (RSV) might improve cerebrovascular function and reduce the risk of developing dementia. Thus, the aim of this systematic review was to assess the effects of RSV on MCI and AD. MEDLINE-PubMed, Cochrane, and EMBASE were used to perform the search, and PRISMA guidelines were followed. Five studies met the eligible criteria; three with AD and two with MCI. In AD patients, the use of RSV reduces Aβ levels, improves brain volume, reduces the Mini-mental status score, and improves AD scores. In patients with MCI, this polyphenol prevents decline in Standard Volumes of Interest and increases the Resting-state Functional Connectivity score. RSV can activate the human silent information regulator 2/sirtuin 1 (Sirt-1) and can inhibit the cyclooxygenase-2 (COX-2), 5-lipoxygenase, and nuclear factor-κB, resulting in the reduction of the proinflammation pathways. It is also associated with the increase in the levels of interleukin (IL)-10 and reduction of interferon-γ and IL-17. Both anti-inflammatory and antioxidant effects can be related to preventing neurodegenerative diseases, doing maintenance, and enabling the recovery of these conditions directly related to inflammation and oxidative stress. We suggest that the use of RSV can bring beneficial effects to patients with MCI or AD.
Thiago Caon,Ricardo Augusto Konig,Ariadne Cristiane Cabral da Cruz,Simone Gonc¸alves Cardoso,Carlos Eduardo Maduro Campos,Silvia Lucia Cuffini,Letı´cia Scherer Koester,Cla´udia Maria Oliveira Simo˜es 대한약학회 2013 Archives of Pharmacal Research Vol.36 No.9
Solid dispersions of saquinavir mesylate containingeither Gelucire 44/14 or poly(ethylene glycol)(PEG) 4000, or mixtures of each carrier with Tween 80 orpolyvinyl pyrrolidone (PVP) K30 were prepared in order toenhance the drug dissolution rate. These systems wereprepared by the melting method and characterized by X-raypowder diffraction, microscopical techniques, and Ramanspectroscopy aiming to establish a relationship betweenphysicochemical and dissolution properties under differentcooling conditions. Modifications in degree of crystallineorder/disorder over time were observed in preparationswith both carriers. Overall, formulations cooled and stored at -20 C showed less variation in dissolution rates thanthose at 25 C. Although Tween 80 has enhanced theknown self-emulsifying properties of Gelucire 44/14, itscombination with PEG 4000 displayed miscibility problems. The addition of PVP K30 was not the most effectiveapproach in enhancing the dissolution in early steps;however, the drug dissolution was stable after 7 days ofstorage at 25 C. The combination of PEG 4000 and PVPK30 maintained the dissolution properties for 60 and90 days at 25 C/95 % relative humidity and 40 C/75 %(f2 values[50), respectively.
Color and Brightness Tuning in Heteronuclear Lanthanide Terephthalate Coordination Polymers
Haquin, Victor,Etienne, Mael,Daiguebonne, Carole,Freslon, Sté,phane,Calvez, Guillaume,Bernot, Kevin,Le Pollè,s, Laurent,Ashbrook, Sharon E.,Mitchell, Martin R.,Bü,nzli, Jean‐,Cla WILEY‐VCH Verlag 2013 European journal of inorganic chemistry Vol.2013 No.20
<P><B>Abstract</B></P><P>Heteronuclear lanthanide terephthalate coordination polymers with the general chemical formula [Ln<SUB>2–2<I>x</I></SUB>Ln′<SUB>2<I>x</I></SUB>(bdc)<SUB>3</SUB>(H<SUB>2</SUB>O)<SUB>4</SUB>]<SUB>∞</SUB>, for which bdc<SUP>2–</SUP> symbolizes benzene‐1,4‐dicarboxylate (or terephthalate) and Ln and Ln′ represent trivalent rare earth ions, were synthesized and structurally characterized. Analysis of the Y/Lu compounds by <SUP>89</SUP>Y and <SUP>13</SUP>C solid‐state NMR spectroscopy was carried out, and the results support the hypothesis of randomly distributed lanthanide ions. The spectroscopic and colorimetric properties of this family of compounds were investigated in detail. The resulting data demonstrate that this series of compounds presents highly tunable luminescence properties and clearly indicate that intermetallic deactivation processes play an important role in the emission mechanism. Playing with intermetallic distances allows one to tune the color and the brightness of the lanthanide emission in these coordination polymers.</P>