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Sergio Lins de-Azevedo-Vaz,João Victor Pereira Machado,Teresa Cristina Rangel Pereira,Deborah Queiroz Freitas 대한영상치의학회 2019 Imaging Science in Dentistry Vol.49 No.1
Purpose: To determine whether calcified carotid atherosclerotic plaques (CCAPs) and mineralized laryngeal cartilages (MLCs) were more frequently detected on digital or film-based panoramic radiographs. The clinical relevance of this question is that some radiopacities seen on digital radiographs may correspond to medium-density tissues that are not necessarily mineralized. Materials and Methods: Data were collected from panoramic radiographs and the respective reports issued by 2 private oral radiology centers. A total of 388 radiographs and reports were divided into film-based (group A) and digital (group D) radiographs. The frequencies of CCAPs and MLCs were analyzed using the Fisher exact test, and odds ratios were also calculated (α=1%). Results: The mean age of patients whose reports and radiographs showed CCAPs and/or MLCs ranged from 50.1 to 54.1 years. There was a predominance of females. A higher frequency of CCAPs and MLCs was observed in group D than in group A at both centers (P<0.01). CCAPs and MLCs were detected 4 times more frequently in group D than in group A at one of the centers. Conclusion: CCAPs and MLCs were more frequently detected on digital than on film-based panoramic radiographs. Further studies are needed to determine whether such radiopacities do indeed correspond to mineralized, rather than medium-density, tissues.
Lateral pterygoid muscle volume and migraine in patients with temporomandibular disorders
Lopes, Sergio Lucio Pereira De Castro,Costa, Andre Luiz Ferreira,Gamba, Thiago De Oliveira,Flores, Isadora Luana,Cruz, Adriana Dibo,Min, Li Li Korean Academy of Oral and Maxillofacial Radiology 2015 Imaging Science in Dentistry Vol.45 No.1
Purpose: Lateral pterygoid muscle (LPM) plays an important role in jaw movement and has been implicated in Temporomandibular disorders (TMDs). Migraine has been described as a common symptom in patients with TMDs and may be related to muscle hyperactivity. This study aimed to compare LPM volume in individuals with and without migraine, using segmentation of the LPM in magnetic resonance (MR) imaging of the TMJ. Materials and Methods: Twenty patients with migraine and 20 volunteers without migraine underwent a clinical examination of the TMJ, according to the Research Diagnostic Criteria for TMDs. MR imaging was performed and the LPM was segmented using the ITK-SNAP 1.4.1 software, which calculates the volume of each segmented structure in voxels per cubic millimeter. The chi-squared test and the Fisher's exact test were used to relate the TMD variables obtained from the MR images and clinical examinations to the presence of migraine. Logistic binary regression was used to determine the importance of each factor for predicting the presence of a migraine headache. Results: Patients with TMDs and migraine tended to have hypertrophy of the LPM (58.7%). In addition, abnormal mandibular movements (61.2%) and disc displacement (70.0%) were found to be the most common signs in patients with TMDs and migraine. Conclusion: In patients with TMDs and simultaneous migraine, the LPM tends to be hypertrophic. LPM segmentation on MR imaging may be an alternative method to study this muscle in such patients because the hypertrophic LPM is not always palpable.
de-Azevedo-Vaz, Sergio Lins,Machado, Joao Victor Pereira,Pereira, Teresa Cristina Rangel,Freitas, Deborah Queiroz Korean Academy of Oral and Maxillofacial Radiology 2019 Imaging Science in Dentistry Vol.49 No.1
Purpose: To determine whether calcified carotid atherosclerotic plaques(CCAPs) and mineralized laryngeal cartilages (MLCs) were more frequently detected on digital or film-based panoramic radiographs. The clinical relevance of this question is that some radiopacities seen on digital radiographs may correspond to medium-density tissues that are not necessarily mineralized. Materials and Methods: Data were collected from panoramic radiographs and the respective reports issued by 2 private oral radiology centers. A total of 388 radiographs and reports were divided into film-based (group A) and digital (group D) radiographs. The frequencies of CCAPs and MLCs were analyzed using the Fisher exact test, and odds ratios were also calculated (${\alpha}=1%$). Results: The mean age of patients whose reports and radiographs showed CCAPs and/or MLCs ranged from 50.1 to 54.1 years. There was a predominance of females. A higher frequency of CCAPs and MLCs was observed in group D than in group A at both centers(P<0.01). CCAPs and MLCs were detected 4 times more frequently in group D than in group A at one of the centers. Conclusion: CCAPs and MLCs were more frequently detected on digital than on film-based panoramic radiographs. Further studies are needed to determine whether such radiopacities do indeed correspond to mineralized, rather than medium-density, tissues.
Fungal diversity in soils across a gradient of preserved Brazilian Cerrado
Ademir Sergio Ferreira de Araujo,Walderly Melgaço Bezerra,Vilma Maria dos Santos,Luis Alfredo Pinheiro Leal Nunes,Maria do Carmo Catanho Pereira de Lyra,Marcia do Vale Barreto Figueired,Vania Maria Ma 한국미생물학회 2017 The journal of microbiology Vol.55 No.4
The preserved Cerrado from Northeastern Brazil presentsdifferent physicochemical properties and plant diversity,which can influence the fungal communities. Therefore, weevaluated the fungal diversity in preserved sites, at Sete CidadesNational Park, across a gradient of vegetation that includedCampo graminoide, Cerrado stricto sensu, Cerradao,and Floresta decidual. Of all of the operational taxonomicunits (OTUs) obtained, the Floresta decidual presented thehighest richness. Ascomycota were the most abundant phylum(45%), followed by Basidiomycota (32%). Basal fungiand other phyla accounted for 23% of the total dataset. Agaricomycetes, Eurotiomycetes, Lecanoromycetes, Basidiobolus,Dothideomycetes, and Taphrinomycetes were themost abundant classes of fungi found across the gradient ofCerrado vegetation. In conclusion, our study suggests thatthe Brazilian Cerrado from Sete Cidades National Park presentsa high fungal diversity and includes sources of newfungal species for biotechnological purposes.
Da Silva Soares,Sergio R. Gomes,Uilame Umbelino,Furukava Marciano,De Souza Carlson Pereira 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The present study investigates the behavior of the sintering and hardness of stainless steel samples reinforced with NbC and TaC. Matrixes of pure stainless steel were compacted with addition of up to 3% wt NbC or TaC in a cylindrical die of steel at 700 MPa and sintered in an electrical resistance furnace under argon atmosphere. The sintered samples were characterized by density and hardness measurement, optical microscopy and scanning electron microscopy (SEM). The preliminary results show that the size and distribution of carbides influence in the sintering and hardness of the sintered samples.
Bruno Salomão Hirsch,Igor Braga Ribeiro,Mateus Pereira Funari,Diogo Turiani Hourneaux de Moura,Sergio Eiji Matuguma,Sergio A. Sánchez-Luna,Fabio Catache Mancini,Guilherme Henrique Peixoto de Oliveira 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.5
Background/Aims: Argon plasma coagulation (APC) is the most commonly used endoscopic treatment for gastric antral vascularectasia (GAVE). Endoscopic band ligation (EBL) has emerged as an alternative therapy. Our goal was to evaluate the feasibility,efficacy, and safety of APC and EBL for the treatment of GAVE. This is the first systematic review that included only randomizedcontrolled trials (RCTs) on this topic. Methods: A comprehensive search was performed using electronic databases to identify RCTs comparing APC and EBL for thetreatment of GAVE following the Preferred Reporting Items for Systematic Reviews and Meta-analyses guidelines. Results: Four RCTs were included, with a total of 204 patients. EBL was related to higher endoscopic eradication rates risk difference[RD], 0.29; 95% confidence interval [CI] [0.14, 0.44]; I2=0%) and less bleeding recurrence than APC (RD, 0.29; 95% CI [0.15, 0.44];I2=0%). Patients treated with EBL required fewer blood transfusions (mean difference [MD], 1.49; 95% CI [0.28, 2.71]; I2=96%) andhospitalizations (MD, 0.29; 95% CI [0.19, 0.39]; I2=0%). The number of sessions required for the obliteration of lesions was higherwith APC. There was no difference in the incidence of adverse events. Conclusions: EBL is superior to APC in the treatment of GAVE in terms of endoscopic eradication rates, recurrence of bleeding, andtransfusion requirements.
De Oliveira, Greison Rabelo,Pozzer, Leandro,Cavalieri-Pereira, Lucas,De Moraes, Paulo Hemerson,Olate, Sergio,De Albergaria Barbosa, Jose Ricardo Korean Academy of Periodontology 2012 Journal of Periodontal & Implant Science Vol.42 No.6
Purpose: Several parameters have been described for determining the success or failure of dental implants. The surface properties of transgingival implant components have had a great impact on the long-term success of dental implants. The purpose of this study was to compare the tendency of two periodontal pathogens to adhere to and colonize zirconia abutments and titanium alloys both in hard surfaces and soft tissues. Methods: Twelve patients participated in this study. Three months after implant placement, the abutments were connected. Five weeks following the abutment connections, the abutments were removed, probing depth measurements were recorded, and gingival biopsies were performed. The abutments and gingival biopsies taken from the buccal gingiva were analyzed using real-time polymerase chain reaction to compare the DNA copy numbers of Aggregatibacter actinomycetemcomitans, Porphyromonas gingivalis, and total bacteria. The surface free energy of the abutments was calculated using the sessile water drop method before replacement. Data analyses used the Mann Whitney U-test, and P-values below 0.05 find statistical significance. Results: The present study showed no statistically significant differences between the DNA copy numbers of A. actinomycetemcomitans, P. gingivalis, and total bacteria for both the titanium and zirconia abutments and the biopsies taken from their buccal gingiva. The differences between the free surface energy of the abutments had no influence on the microbiological findings. Conclusions: Zirconia surfaces have comparable properties to titanium alloy surfaces and may be suitable and safe materials for the long-term success of dental implants.
Queiroz, Polyane Mazucatto,Santaella, Gustavo Machado,Lopes, Sergio Lucio Pereira de Castro,Haiter-Neto, Francisco,Freitas, Deborah Queiroz Korean Academy of Oral and Maxillofacial Radiology 2020 Imaging Science in Dentistry Vol.50 No.4
Purpose: The purpose of this study was to evaluate the image quality, diagnostic efficacy, and radiation dose associated with the use of a cadmium telluride (CdTe) detector, compared to charge-coupled device (CCD) and complementary metal oxide semiconductor(CMOS) detectors. Materials and Methods: Lateral cephalographs of a phantom (type 1) composed of synthetic polymer filled with water and another phantom (type 2) composed of human skull macerated with polymer coating were obtained with CdTe, CCD, and CMOS detectors. Dosimeters placed on the type 2 phantom were used to measure radiation. Noise levels from each image were also measured. McNamara cephalometric analysis was conducted, the dentoskeletal configurations were assessed, and a subjective evaluation of image quality was conducted. Parametric data were compared via 1-way analysis of variance with the Tukey post-hoc test, with a significance level of 5%. Subjective image quality and dentoskeletal configuration were described qualitatively. Results: A statistically significant difference was found among the images obtained with the 3 detectors(P<0.05), with the lowest noise level observed among the images obtained with the CdTe detector and a higher subjective preference demonstrated for those images. For the cephalometric analyses, no significant difference (P>0.05) was observed, and perfect agreement was seen with regard to the classifications obtained from the images acquired using the 3 detectors. The radiation dose associated with the CMOS detector was higher than the doses associated with the CCD (P<0.05) and CdTe detectors(P<0.05). Conclusion: Considering the evaluated parameters, the CdTe detector is recommended for use in clinical practice.