A prospective cross-over study to evaluate the effect of two different occlusal concepts on the masseter muscle activity in implant-retained mandibular overdentures

BACKGROUND: The purpose of this prospective cross-over study is to evaluate the effect of bilateral balanced occlusion and canine guidance occlusion on the masseter muscle activity using implant-retained mandibular overdentures. METHODS: After evaluation of 12 completely edentulous patients using cone beam computed tomography (CBCT), mucoperiosteal flaps were reflected exposing the mandibular interforaminal region. Two implants were placed in the interforaminal region for each of the 12 patients. After a healing period of 3 months, acrylic maxillary complete dentures and mandibular overdentures were fabricated with bilateral balanced occlusion for 6 patients and canine guidance occlusion for the other 6 patients. Electromyographic evaluation of the masseter muscles, during clenching on a silicon index and chewing peanuts and cake, was conducted on the patients after using their dentures for 4 weeks. Each occlusion concept was then converted into the other concept using the same dentures, and the procedure of evaluation was repeated after 4 weeks. The recordings were analyzed statistically using Wilcoxon signed ranks test. p < 0.05 was considered statistically significant. RESULTS: The highest electromyographic activity of the masseter muscles was recorded during clenching on a preformed silicon index followed by chewing peanut then cake for both occlusal concepts. The recordings of the masseter muscle associated with canine guidance occlusion were higher than bilateral balanced occlusion but with no statistically significant difference except between the right masseter muscles during clenching (p = 0.042*). CONCLUSIONS: Both bilateral balanced occlusion and canine guidance occlusion can be used successfully in implant-retained mandibular overdentures without affecting masseter muscle activity

The Minimum Inhibitory Concentrations exerted by the N-salicylidene-2-substituted aniline against various strains of phytopathogenic

Fusarium genus includes several plant pathogenic fungi that may attack a large number of plants, causing diseases called fusarioses. In our strategy of the fight against this kind of fungus in vitro, we tested the acidity and the basicity of the culture medium (PDA) on mycelial growth of this genus of fungus, followed by the determination of the minimal inhibitory concentration of synthetic compounds (Schiff bases) such as N-salicylidene-2-methoxyaniline and N-salicylidene-2-nitroaniline against three species plant pathogenic: Fusarium culmorum, Fusarium graminearum and Fusarium verticillioides, using the agar dilution method at different concentrations of these two Schiff base derivatives and Tachigaren 30% SL as a standard fungicide. We found that the low acidity of the culture medium revealed better mycelial growth. The results show that the inhibition of mycelial growth seems to be proportional to the concentration of these compounds, however a better activity was revealed for the compound N-salicylidene-2-methoxyaniline with Minimum Inhibitory Concentration (MIC) =10 mg / ml against of the F. culmorum and F. graminearum strains. The two compounds tested showed a diversity of activity for all the fungal strains. This may be due to the presence of the various substituted groups (methoxy and nitro) on the structure of these compounds

Prevalence and Predictors of Insulin Resistance in Non-Obese Healthy Young Females in Qatar

The state of Qatar suffers from diabetes epidemic due to obesity-associated metabolic syndrome. However, the prevalence of insulin resistance prior to obesity, which could play an important role in the high prevalence of diabetes, has not yet been described. This study aims to compare the prevalence of insulin resistance in apparently healthy non-obese and obese participants from Qatar and identify the predictors of insulin resistance in different body massindex(BMI)-groups. In this cross-sectional study, 150 young healthy females from Qatar were dichotomized into four groups (underweight, normal weight, overweight and obese) based on their BMI. Anthropometric measures as well as fasting plasma levels of lipids, adipokines, blood glucose and insulin were recorded. The prevalence of insulin resistance as per homeostatic model assessment of insulin resistance (HOMA-IR) was estimated and differences between insulin sensitive and insulin resistant were compared. Linear models were used to identify predictors of insulin resistance in every BMI group. Prevalence of insulin resistance in non-obese healthy females from Qatar ranges between 7% and 37%and increases with BMI. Overall, predictors of insulin resistance in the Qatari population are triglycerides/high-density lipoprotein (HDL) ratio and free fat mass but vary according to the BMI group. The main predictors were triglycerides in normal weight, triglycerides/HDL in overweight and triglycerides/HDL and interleukin-6 (IL-6) in obese individuals. The high prevalence of insulin resistance in non-obese Qataris may partially explain diabetes epidemic. Larger studies are warranted to confirm these findings and identify underlying causes for insulin resistance in non-obese individuals in Qatar, aiming at targeted intervention before diabetes onsetThis project was funded by Qatar University (grant number QUST-CAS-FALL-14\15-35). The publication of this article was funded by the Qatar National Library

IDS IN TELECOMMUNICATION NETWORK USING PCA

ABSTRAC

STRESS ANALYSIS COMPARING EFFECT OF TWO DIFFERENT CAD-CAM IMPLANT SUPERSTRUCTURE MATERIALS (IN-VITRO STUDY)

Purpose: This study was conducted to evaluate the micro-strain around dental implant using two different CAD/CAM crown fabricated materials through strain gauge analysis. Materials and Methods: Five dental implants were fixed in a 5 previously drilled solid rigid polyurethane test blocks in the edentulous area with neighboring abutments mesial and distal printed out using special 3D Dental printer, Cyanoacrylate adhesive was then used to fix the printed-out part on to the polyurethane test blocks, creating the bounded saddle replicas. Ten CAD/CAM screw retained crowns were fabricated; five Enamic crowns from vita enamic blocks, and five zirconia crowns from presintered katana zirconium blocks. Each crown was cemented to abutment and screwed over the implant fixture. Two strain gauges were installed on their corresponding prepared sites to measure the micro-strains in the medium surrounding the implant. For each tested implant, loads were applied by a universal testing machine, micro-strains were recorded with the strain gauges and stress distribution around the implant was statistically evaluated. Results: Micro-strain recording revealed a statistically significant difference in mean micro-strain recording applied in central fossa between Zirconia and Enamic, for both the buccal and lingual measurements, Enamic was significantly lower than Zirconia. Conclusion: The modulus of elasticity of restorative materials has a meaningful effect on forces applied to dental implant and transmitted to the supporting bone

2-((E)-{[4-(Hy­droxy­meth­yl)phen­yl]imino}­meth­yl)phenol

The title compound, C14H13NO2, adopts the enol–imine tautomeric form, with an intra­molecular O—H⋯N hydrogen bond which generates an S(6) ring motif. The dihedral angle between the aromatic rings is 7.85 (7)°. The crystal structure is stabilized by O—H⋯O, O—H⋯N and C—H⋯O hydrogen bonds, forming a two-dimensional array that stacks along the a axis. In addition, a C—H⋯π inter­action contributes to the stabilization of the crystal packing

Ethyl (Z)-2-(4-chloro­benzyl­idene)-3-oxobutano­ate

The C=C double-bond in the title compound, C13H13ClO3, has a Z configuration. The aliphatic substituents at one end of the double bond, i.e. the CH3CO– and C2H5O2C– groups, are aligned at 82.1 (3)° with respect to each other

Magnetic resonance imaging of head and neck vascular anomalies: pearls and pitfalls

Purpose: The aim of this study was to describe typical MRI features of the head and neck vascular anomalies and the possible diagnostic pitfalls.Patients and methods: Patients with extracranial vascular anomalies of the head and neck, who underwent MRI examinations between January 2013 and January 2016, were included in the study. Precontrast and postcontrast T1-WI,T2-WI, with and without fat saturation were acquired. When indicated, a noncontrast MR angiography was performed. Dynamic postcontrast MRI techniques were available in six children.Results: The study included 33 patients (age ranged from 10 to 20 years, mean: 49 months). MRI confirmed the clinical diagnosis in equivocal cases, and provided proper determination of lesion extension and/or associated intracranial anomalies. The study included 10 cases of vascular tumors (hemangioma), whereas the remaining 23 cases had the diagnosis of vascular malformations (one patient with arteriovenous malformation, one with capillary malformation, seven with venous, nine with macrocystic lymphatic, and five with microcystic lymphatic malformations).Conclusion: Vascular anomalies in the head and neck are mostly diagnosed on clinical basis; however, when the history is uncertain or the diagnosis is equivocal, a well-tailored MR examination can be a single valuable diagnostic tool providing structural and functional information.Keywords: children, head and neck, hemangioma, lymphatic malformation, magnetic resonance angiography, venous malformatio

Network Analysis of the Brief ICF Core Set for Schizophrenia

Background: The International Classification of Functioning, Disability, and Health Core Sets (ICF-CSs) for schizophrenia are a set of categories for assessing functioning in persons with this health condition. This study aimed to: a) estimate the network structure of the Brief ICF-CS for schizophrenia, b) examine the community structure (categories strongly clustered together) underlying this network, and c) identify the most central categories within this network. Methods: A total of 638 health professionals from different backgrounds and with a significant role in the treatment of individuals with schizophrenia participated in a series of Delphi studies. Based on their responses we used the Ising model to estimate the network structure of the 25-category Brief ICF-CS, and then estimated the degree of centrality for all categories. Finally, the community structure was detected using the walktrap algorithm. Results: The resulting network revealed strong associations between individual categories within components of the ICF (i.e., Body functions, Activities and participation, and Environmental factors). The results also showed three distinct clusters of categories corresponding to the same three components. The categories e410 Individual attitudes of immediate family members, e450 Individual attitudes of health professionals, d910 Community life, and d175 Solving problems were among the most central categories in the Brief ICF-CS network. Conclusion: These results demonstrate the utility of a network approach for estimating the structure of the ICF-CSs. Implications of these results for clinical interventions and development of new instruments are discussed