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Does the time interval after bleaching influence the adhesion of orthodontic brackets?
Nascimento, Glaucia Cristina Rodrigues,Miranda, Cyndi Albuquerque De,Machado, Sissy Maria Mendes,Brandao, Gustavo Antonio Martins,Almeida, Haroldo Amorim De,Silva, Cecy Martins The Korean Association Of Orthodontists 2013 대한치과교정학회지 Vol.43 No.5
Objective: To test the null hypothesis that no difference exists between the effects of at-home bleaching and in-office bleaching on shear bond strength (SBS) with bracket bonding at 4 different time intervals after dental bleaching. Methods: Ninety extracted human premolars were randomly divided into 9 groups (n = 10) according to the bleaching methods used (at-home bleaching and in-office bleaching) and the storage time in artificial saliva (30 min, 1 day, 2 weeks, and 3 weeks before bonding). The control group was stored in artificial saliva for 7 days. Brackets were bonded with the Transbond XT adhesive system, and SBS testing was performed. The adhesive remnant index (ARI) was used to assess the amount of resin remaining on the enamel surfaces after debonding. The SBS data were analyzed by analysis of variance (ANOVA) and the Tukey test. For the ARI, the Kruskal-Wallis test was performed. Significance for all statistical tests was predetermined to be p < 0.05. Results: The SBS of the unbleached group was significantly higher (p < 0.05) than that of the bleached groups (except for the group bonded 30 min after at-home bleaching). Conclusions: The null hypothesis was not totally rejected. All bleaching groups tested had decreased SBS of the brackets to the enamel, except for the group bonded 30 min after at-home bleaching. The SBS returned to values close to those of the unbleached enamel within 3 weeks following bleaching.
Assessment of the anterior loop of the mandibular canal: A study using cone-beam computed tomography
Nascimento, Eduarda Helena Leandro do,Pontual, Maria Luiza dos Anjos,Pontual, Andrea dos Anjos,Perez, Danyel Elias da Cruz,Figueiroa, Jose Natal,Frazao, Marco Antonio Gomes,Ramos-Perez, Flavia Maria d Korean Academy of Oral and Maxillofacial Radiology 2016 Imaging Science in Dentistry Vol.46 No.2
Purpose: Sufficient area in the interforaminal region is required for dental implant placement, and the anterior loop of the mandibular canal is located within the limits of this area. The aim of this study was to evaluate the prevalence and extent of the anterior loop in a Brazilian sample population using cone-beam computed tomography (CBCT). Materials and Methods: CBCT images from 250 patients (500 hemimandibles) obtained for various clinical indications were randomly selected and evaluated to determine the presence and length of the anterior loop. The length of the anterior loop was then compared based on gender, age, and the side of the mandible. The data were analyzed using the Pearson chi-square test and linear regression analysis. Results: An anterior loop was identified in 41.6% of the cases, and its length ranged from 0.25 mm to 4.00 mm (mean, $1.1{\pm}0.8mm$). The loop had a greater mean length and was significantly more prevalent in males (p=0.014). No significant differences were found between the right and left sides regarding length (p=0.696) or prevalence (p=0.650). Conclusion: In this study, a high prevalence of the anterior loop of the mandibular canal was found, and although its length varied greatly, in most cases it was less than 1 mm long. Although this is a prevalent anatomical variation, safety limits for the placement of implants in this region cannot be established before an accurate evaluation using imaging techniques in order to identify and preserve the neurovascular bundles.
Nascimento, Thiago,Jung, Jae Cheon The Korean Society of Systems Engineering 2020 시스템엔지니어링학술지 Vol.16 No.2
Most of the reactor trips in Korean NPPs related to core protection systems were caused not because of proximity of boiling crisis and, consequently, a damage in the core, but due to particular miscalculations or component failures related to the core protection system. The most common core protection system applied in Korean NPPs is the Core Protection Calculator System (CPCS), which is installed in OPR1000 and APR1400 plants. It generates a trip signal to scram the reactor in case of low Departure from Nucleate Boiling Ratio (DNBR) or high Local Power Density (LPD). However, is a reactor trip necessary to protect the core? Or could a fast power reduction be enough to recover the DNBR/LPD without a scram? In order to analyze the online calculation of DNBR/LPD, and the use of fast power reduction as trip avoidance methodology, a concept of CPCS with fast power reduction function was developed in Matlab® Simulink using systems engineering approach. The system was validated with maximum of 0.2% deviation from the reference and the dynamic deviation was maximum of 12.65% for DNBR and 6.72% for LPD during a transient of 16,000 seconds.
Raquel Nascimento de Souza,Fernanda Kohn Silva,Magda Alves de Medeiros 사단법인약침학회 2017 Journal of Acupuncture & Meridian Studies Vol.10 No.3
Spinal cord injuries (SCIs) initiate a series of molecular and cellular events in which inflammatory responses can lead to major neurological dysfunctions. The present study aims to investigate whether bee venom (BV) acupuncture applied at acupoints ST36 (Zusanli) and GV3 (Yaoyangquan) could minimize locomotor deficits and the magnitude of neural tissue losses, and change the balance between pro- and anti-inflammatory cytokines after an SCI by compression. Wistar rats were subjected to an SCI model by compression in which a 2-French Fogarty embolectomy catheter was inflated in the extradural space. The effects of BV acupuncture, in which 20 μL of BV diluted in saline (0.08 mg/kg) was injected at acupoints GV3 and ST36 [BV(ST36+GV3)-SCI] was compared with BV injected at nonacupoints [BV(NP)-SCI] and with no treatment [group subjected only to SCI (CTL-SCI)]. The BV(ST36+GV3)-SCI group showed a significant improvement in the locomotor performance and a decrease of lesion size compared with the controls. BV acupuncture at the ST36 + GV3 increased the expression of interleukin-10 (anti-inflammatory) at 6 hours and reduced the expression of interleukin-6 (proinflammatory) at 24 hours after SCI compared with the controls. Our results suggest that BV acupuncture can reduce neuroinflammation and induce recovery in the SCI compression model.
Multi-objective Adaptive Evolutionary Algorithm to Enhance Voltage Stability in Power Systems
Sidnei Nascimento,Maury M. Gouvêa Jr. 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.7
Problems with two or more conflicting objectives have been handled as needing a multi-objective approach in recent years. The solution for these types of problems is normally to satisfy the conflicting objectives simultaneously in order to find tradeoffs between different criteria. Optimization in power systems is an important example of how to tackle multi-objective problems since these systems have conflicting performance indicators and normally operate close to their constraints due to the continuous increase in demand. In this paper, a multi-objective approach is applied to the voltage stability problem in power systems by using an adaptive evolutionary algorithm. The proposed method regards examining the following stability indicators of power systems: the voltage profile, the total reactive power loss, and the voltage collapse margin as requiring a multi-objective approach. Several experiments were conducted in IEEE 14, 57, and 118 busbar systems by using the proposed method and other probabilistic and heuristic optimization methods. The results showed that the proposed adaptive evolutionary algorithm enhanced the voltage stability and outperformed the other methods, especially when the size of the power system increases.
do Nascimento Rafaela Andrade,Vieira Mariana Carmem Apolinário,Fernandes Juliana,Azevedo Ingrid Guerra,Moreira Mayle Andrade,Costa José Vilton,Câmara Saionara Maria Aires da,Maciel Álvaro Campos Caval 한국역학회 2022 Epidemiology and Health Vol.44 No.-
OBJECTIVES: This study analyzed the influence of anthropometric indices of adiposity on the physical performance of middle-aged and older women. METHODS: A cross-sectional study was conducted among 368 women from 50 years to 80 years old. Anthropometric and biochemical characteristics were analyzed, and physical performance was evaluated. The statistical analysis used measures of central tendency and dispersion for descriptive data, Pearson correlations to demonstrate the initial associations between the variables, and canonical correlation (CC) to evaluate the relationship between the set of anthropometric adiposity indices and performance-related variables. RESULTS: The participants had a mean age of 58.57± 8.21 years, a visceral adiposity index of 7.09± 4.23, a body mass index of 29.20 ± 4.94 kg/m2 , and a conicity index of 1.33 ± 0.07. The average handgrip strength was 25.06 ± 4.89 kgf, gait speed was 1.07± 0.23 m/s, and the mean Short Physical Performance Battery (SPPB) score was 10.83± 1.36. The first canonical function presented the highest shared variance, CC, and redundancy index (cumulative percentage of variance, 82.52; Wilks’ lambda, 0.66; CC, 0.532; p< 0.001). From the analysis of this canonical function, the conicity index (-0.59) displayed inverse correlations with handgrip strength (0.84) and the SPPB (0.68), as well as a direct correlation with gait speed (-0.43). CONCLUSIONS: In middle-aged and older women, there was an inverse relationship between the conicity index and muscle strength and power, while a direct relationship was found between the same index and gait speed.
Do Nascimento, Gustavo M.,Do Pim, Walace D.,Endo, Morinobu,Choi, go Bong,Kim, Yoong Ahm,Pradie, Noriberto A.,Stumpf, Humberto O. Elsevier 2019 Journal of molecular structure Vol.1176 No.-
<P><B>Abstract</B></P> <P>Nanocomposites formed from the precursor of molecule-based magnets [Cu(opba)]<SUP>2−</SUP> [opba = <I>o</I>-phenylenebis(oxamate)] and single-wall carbon nanotubes (SWCNTs) were characterized by X-ray absorption near edge structure (XANES) and X-ray photoelectron spectroscopy (XPS) at Carbon and Nitrogen <I>K</I> edges and Cu <SUB> L 2,3 </SUB> edges. The N <I>K</I> XANES, XPS and micro-ATR-FTIR data strongly suggested that [Cu(opba)]<SUP>2−</SUP> molecules be flatly bonded onto the surface of the SWCNTs. Therefore, higher charge delocalization and electronic modifications were observed. The presence of a new band at 286.1 eV in the Carbon peak of XPS spectra of nanocomposites was assigned to the Carbon surface of the SWCNTs modified by interaction with the metal complex. The micro-ATR-FTIR data supported by DFT calculations show many changes in the bands related to νC = C and νC = O groups of the metal complex in the nanocomposites. Such changes confirmed that the vibrational properties of the complex also changed due to interaction with the carbon nanotubes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> XANES and XPS data of (NBu<SUB>4</SUB>)<SUB>2</SUB>[Cu(opba)]-SWCNT nanocomposites at several atomic edges. </LI> <LI> Micro-ATR-FTIR used for studying the metallic complex over SWCNT surface. </LI> <LI> Oxamate-based complex have strong interaction with SWCNT by −CuN− sites. </LI> </UL> </P>
Rosiane Nascimento Alves,Susana Elisa Rieck,Carlos Ueira-Vieira,Marcelo Bahia Labruna,Marcelo Emílio Beletti 대한수의학회 2014 Journal of Veterinary Science Vol.15 No.2
Amplification of the 16S rRNA gene from a blood sampleobtained from a dog in southeastern Brazil was used to confirma naturally acquired Ehrlichia (E.) canis infection. Followingisolation and culturing of the new bacterial strain calledUberlândia, partial sequences of the dsb and p28 genes wereobtained. The dsb partial sequence of the novel strain was100% similar to dsb gene sequences of E. canis obtained fromdifferent geographic areas around the world. Conversely, thep28 partial sequence for the E. canis Uberlândia strain differedat several nucleotides from other sequences available inGenBank. To confirm the antigenic profile of the Uberlândiastrain, an indirect immunofluorescence assay against E. canisantigens was performed using dog sera collected from twodifferent areas in Brazil (Uberlândia and São Paulo). Theresults suggest that both antigens were able to identify animalsseropositive for E. canis in Brazil since these Brazilian strainsappear to be highly conserved.