Review on finite element analysis of dental implants

Fatma Nur Büyük(Fatma Nur Büyük ),Efe Savran(Efe Savran ),Fatih Karpat(Fatih Karpat ) 대한치과이식임플란트학회 2022 The Korean Academy of Implant Dentistry Vol.41 No.3

Dental implants are structures of high importance, as in other implant studies used in the biomedical field. The jawbone is a structure of such importance that it affects the nutritional functions of the living thing with which it is integrated. Therefore, intervention in this structure is of high importance. Parts for use in the biomedical field can be produced using numerical analysis, thus saving time and cost. In addition, the level of trust increases in the living being where the dental implant is applied. This paper reviews studies using the finite element method for the numerical analysis of dental implants. The analysis revealed important conditions, such as groove type, material, osseointegration status, splinting, dimensions, neck region, and fatigue strength of the dental implant.

Best practices for initiation of banana and plantain (Musa spp.) cultures

Fatma H. Kiruwa(Fatma H. Kiruwa ),Emanuel Epathra Mlinga(Emanuel Epathra Mlinga ),Agatha Amnaay Aloyce(Agatha Amnaay Aloyce ),Mpoki Mathew Shimwela(Mpoki Mathew Shimwela ) (사)한국식물생명공학회 2024 JOURNAL OF PLANT BIOTECHNOLOGY Vol.51 No.1

Fouling mechanism and screening of backwash parameters

Fatma Zohra Slimane,Fatma Ellouze,Nihel Ben Amar 대한환경공학회 2019 Environmental Engineering Research Vol.24 No.2

This work deals with the membrane fouling mode and the unclogging in seawater ultrafiltration process. The identification of the fouling mechanism by modeling the experimental flux decline was performed using both the classical models of Hermia and the combined models of Bolton. The results show that Bolton models did not bring more precise information than the Hermia’s and the flux decline can be described by one of the four Hermia’s models since the backwash interval is ≤ 60 min. An experimental screening study has been then conducted to choose among 5 parameters (backwash interval, duration, pulses and the flow-rate or injected hypochlorite concentration) those that are the most influential on the fouling and the net water production. It has emerged that fouling is mainly affected by the backwash interval; its prolongation from 30 to 60 min engenders an increase in the reversible fouling and a decrease in the irreversible fouling. This later is also significantly reduced when the hypochlorite concentration increases from 4.5 to 10 ppm. Moreover, the net water production significantly increases with increasing the filtration duration up to 60 min and decreases with decreasing the backwash duration and backwash flow-rate from 10 to 40 s and from 15 to ≥ 20 L.min<SUP>-1</SUP>, respectively.

Identification of the main cause of mortality in a commercial Oreaochromis niloticus farm: The role of poly-β-hydroxybutyrate as a preventive measure against Edwardsiellosis

Fatma M. M. Korni,Fatma I. Abo El-Ela,Usama K. Moawad 한국어병학회 2023 한국어병학회지 Vol.36 No.1

The current study aimed to identify the primary cause of mortality in a commercial Oreochromis niloticus (O. niloticus) farm. Furthermore, the efficacy of poly-β-hydroxybutyrate (PHB) as a feed additive to prevent mortality was investigated after in-vitro testing. Also, a histopathological examination was carried out. The samples of naturally diseased O. niloticus showed swellings and hemorrhages on the body surface. Moreover, the post-mortem examination revealed black fluids with an awful odor, a congested liver, and intestinal gasses. Concerning diagnosis of the main cause of mortality in diseased O. niloticus, , there were eight isolates might be Edwardsiella tarda based on the biochemical identification results. Also, the identification was confirmed by using matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS). The resulting spectra of two previously identified E. tarda strains were then compared to those found in the Bruker database and the two strains were identified as E. tarda at the species level. For detection of pathogenicity of identified strains, the virulence E. tarda hemolysin (ETHA) gene were detected at band 1078 bp in the eight identified strains. Regarding the in-vitro antimicrobial activity of PHB against E. tarda, the antibacterial activity of blood and tissues had been calculated using the Agar and well diffusion procedures Prior to and after the challenge,. Lower bacterial counts and a larger inhibition zone were signs of the tested materials' concentration-dependent antibacterial activity. For in-vivo evaluation of PHB in dietary-fed O. niloticus, PHB was effective in preventing Edwardsiellosis, with the lowest mortality rates in the group fed 10 g PHB/Kg feed after being injected with E. tarda. In comparison, the group that received a 5 g PHB/Kg feed after receiving an injection of E. tarda saw 16.6% mortalities and a 66.7 percent relative survival rate. The control positive group had 50% mortality. The results of the biochemical testes showed that O. niloticus's kidney and liver functions were unaffected by dietary PHB supplementation. Protein, albumin, globulin, urea, creatinine, aspartate transaminase levels were identical to those of the control negative group. According to the current study, the groups fed high and low PHB concentrations had considerably higher levels of immunoglobulin M, complement 5, and interleukin-1 than the control group. The number of total viable bacteria was lower in the gut of PHB-fed groups than in control. Compared to mild histological alterations in those fed with a lower dosage and severe histopathological abnormalities in the control group, the greater dose of PHB effectively prevented Edwardsiellosis in O. niloticus with decreased mortality and no histopathological changes.

Tuberculous and Brucellar Spondylodiscitis: Comparative Analysis of Clinical, Laboratory, and Radiological Features

Hammami Fatma,Koubaa Makram,Feki Wiem,Chakroun Amal,Rekik Khaoula,Smaoui Fatma,Marrakchi Chakib,Mnif Zeineb,Jemaa Mounir Ben 대한척추외과학회 2021 Asian Spine Journal Vol.15 No.6

Study Design: This was a retrospective study. Purpose: The aim was to compare the clinical, laboratory, radiological, and evolutionary features of tuberculous spondylodiscitis (TS) and brucellar spondylodiscitis (BS). Overview of Literature: Clinical presentation of spondylodiscitis varies according to the underlying etiology, among which brucellosis and tuberculosis represent the primary cause, in endemic countries. Only a few studies have compared the characteristics between TS and BS. Methods: A retrospective study was conducted using the data of all patients hospitalized for TS and BS in the infectious diseases department between 1991 and 2018. Results: Among a total of 117 patients, 73 had TS (62.4%) and 44 had BS (37.6%). Females were significantly more affected with TS than males (56.2% vs. 22.7%, p <0.001). Fever (72.7% vs. 45.2%, p =0.004) and sweating (72.7% vs. 47.9%, p =0.009) were significantly more frequent among patients with BS. The median erythrocyte sedimentation rate was significantly higher in the TS group (median, 70 mm/hr; interquartile range [IQR], 45–103 mm/hr) than in the BS group (median, 50 mm/hr; IQR, 16–75 mm/hr) (p =0.003). Thoracic involvement was significantly more frequent in the TS group (53.4% vs. 34.1%, p =0.04), whereas lumbar involvement was significantly more frequent in the BS group (72.7% vs. 49.3%, p =0.01). Initial imaging findings revealed significantly higher frequencies of posterior vertebral arch involvement, vertebral compaction, and spinal cord compression in the TS group. Percutaneous abscess drainage (20.5% vs. 2.3%, p =0.005) and surgical treatment (17.8% vs. 2.3%, p =0.01) were more frequently indicated in the TS group, with a significant difference. Conclusions: A combination of clinical, laboratory, and radiological features can be used to distinguish between TS and BS while these patients await diagnosis confirmation.

Evaluation of Two ELISA and Two Indirect Hemagglutination Tests for Serodiagnosis of Pulmonary Hydatid Disease

Fatma Nur Eris,Ciler Akisu,Umit Aksoy 대한기생충학열대의학회 2009 The Korean Journal of Parasitology Vol.47 No.4

Chronic Pelvic Abscedation After Completion Proctectomy in a Rectal Stump Insufficiency; Treatment With Gracilis Muscle Flap Following Vacuum Assisted Closure Therapy

Fatma Ayca Gultekin,Bekir Hakan Bakkal,Sait Tayfun,Orhan Babuccu,Mustafa Comert 대한대장항문학회 2013 Annals of Coloproctolgy Vol.29 No.4

Presacral abscess formation due to rectal stump insufficiency following Hartmann procedure is very rare complication. If the abscess cavity is large, it might delay the reversal of the stoma and will probably result in a devastating future functioning of the neorectum. Moreover, very invasive treatments will be required in order to prevent severe septic complications. We present the case of a 58-year-old man with a past history of Hartmann procedure for a low rectal carcinoma who presented with rectal stump insufficiency and a large presacral abscess. Following extensive debridement and rectal stump resection, a vacuum-assisted closure (VAC) system was applied to the large abscess cavity to facilitate gracilis muscle flap reconstruction and to optimize wound healing. The satisfactory results showed in the present report led us to favor a combination of VAC therapy and a gracilis muscle flap in intrapelvic and perineal reconstruction in the case of large defects associated with high risks of septic complications.

The use of methanol extract of Rheum Ribes (Is gın) flower as a natural and promising corrosion inhibitor for mild steel protection in 1 M HCl solution

Fatma Kaya,Ramazan Solmaz,İbrahim Halil Geçibesler 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.122 No.-

There is a tendency towards natural products with the increase in sensitivity to the environment, peopleand other living things around the world. In recent years, there has been a similar trend regarding inhibitorsused in the metals protection against corrosion. In this study, the adsorption and protection abilityof Rheum ribes (RR) flower extract on mild steel (MS) corrosion in 1MHCl solution were investigated withthe help of many electrochemical techniques. The MS surface after exposing to the test solutions wasexamined by energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM) and contactangle measurements. Some thermodynamic parameters corresponding to the adsorption of extractmolecules on the MS surface and excess surface charge of the steel in the extract containing solution werecalculated and a possible mechanism of the corrosion inhibition process was discussed. The durability ofthe extract film formed on the MS surface was examined under potentiodynamic and potentiostatic conditions. It was found that an adherent and uniformly distributed extract film formed on the MS surface,which is responsible for the inhibition of corrosion. The flower extract provided 94.7 % and 98.4 % protectionefficiencies at 1000 ppm concentration after 1 h and 6 h exposure. RR flower extract mitigatedboth anodic and cathodic reactions, predominantly cathodic process. The extract molecules interactand bond to the MS surface via physical and chemical interactions. The extract could be suggested as apromising natural corrosion inhibitor for MS protection in 1 M HCl solution.

Persistent organic pollutants in sewage sludge: Occurrence, temporal concentration variation and risk assessment for sewage sludge amended soils

Fatma Beduk,Senar Aydin,Arzu Ulvi,Mehmet Emin Aydin 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.9

In this study, the occurrences, temporal concentration variations and ecotoxicological risks were determined for 18 polycyclic aromatic hydrocarbons (PAHs); 7 congeners of polychlorinated biphenyls (PCBs), and 18 selected organochlorine pesticides (OCPs) in the anaerobically digested sewage sludge samples obtained from a conventional wastewater treatment plant (WWTP) in Konya, Turkey. Flowrate of the evaluated WWTP was 200,000 m3/day, with the production of 140 tons/day treated sewage sludge. Total 18 PAHs were in the range of 1,203 −17,599 μg/kg of dry matter (dm); total PCBs were in the range of 51.26 – 561.37 μg/kg dm, and total OCPs were in the range of 4.90 – 13.11 μg/kg dm. The highest concentrations were determined for fluoranthene among PAHs, with 2445 μg/kg dm, PCB118 congener with 514 μg/kg dm, and δ-HCH among OCPs with 2.44 μg/kg dm. Considering the average daily production amounts of treated sludge, the highest mass loads were 1,785 g/day for total PAHs; 79 g/day for total PCBs; and 1 − 2 g/day for total OCPs, while the annual mass load was estimated to be approximately 7.3 kg. An ecotoxicological risk assessment was performed by estimation of risk quotients (RQs). High risk for soil ecosystem was identified due to PAHs and PCBs ingredient of sludge, while lower risk was determined for OCPs compounds. The highest RQ values were determined for pyrene (RQ: 1337) among PAHs, PCB118 congener (RQ: 7608), and γ-HCH (RQ: 5.23) among OCPs. Findings of this study show that sewage sludge can be an important source in the spread of persistent pollutants to the environment, and may pose a risk for soil ecosystem.

Rare Cause of Hematochezia in Children: Solitary Rectal Ulcer, Single Center Experience

Fatma İlknur Varol,Şükrü Güngör,Mukadder Ayşe Selimoğlu,Emine Şamdancı 대한소화기학회 2024 대한소화기학회지 Vol.83 No.1

Background/Aims: Solitary rectal ulcer syndrome (SRUS) can be overlooked, diagnosed late, or misdiagnosed, particularly in childhood. This study reviewed the 13-year experience of the authors’ institution to increase clinicians' awareness of SRUS in the presence of symptoms. This paper reports the endoscopic and histopathological findings in children presenting with hematochezia. Methods: The clinical and laboratory findings of 22 patients diagnosed with biopsy-proven SRUS in the authors’ clinic between 2007 and 2020 were evaluated retrospectively. Results: The mean age at diagnosis was 12.5±2.6 years, and 59.1% of the patients were male. The median time of diagnosis was 24 months. A single ulcer lesion was found by colonoscopy in 18 patients (81.8%), two ulcers in two patients (9%), and more than two ulcers in two patients (9%). The pathology reports of all biopsies taken from the lesions were consistent with a solitary rectal ulcer. In the first stage, the treatment was started with toilet training, a high-fiber diet, and laxatives. In 11 patients (50%) who did not respond to the initial treatment, a 5-ASA enema was added. A glucocorticoid enema was added to treatment in five patients (22%) whose complaints did not regress despite this treatment. Clinical remission was achieved in five of the patients (18.1%). The time to diagnosis was significantly shorter in those in remission than those not in remission (p=0.04). Conclusions: This study is the first large series on Turkish children. An increased awareness of SRUS in children will increase the rate of early diagnosis and treatment, allowing remission in more patients.