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Öğe Dicle Üniversitesi yanık merkezinde 2011-2020 yılları arasında tedavi edilen yanık hastalarının epidemiyolojik olarak incelenmesi(Dicle Üniversitesi Tıp Fakültesi, 2022) Akkoç, Mehmet Fatih; Özdemir, MehmetAmaç: Bu çalışmanın amacı 2011 yılının Ocak ayından 2020 yılının Aralık ayı bitimine kadar, yanık merkezimizde tedavi edilen yanık hastalarına ait kayıtların epidemiyolojik olarak incelenmesidir. Yöntemler: Bu tanımlayıcı ve kesitsel türdeki çalışma Dicle Üniversitesi Tıp Fakültesi Hastanesi Yanık Merkezinde, retrospektif olarak gerçekleştirildi. 2011-2020 yılları arasında yanık vakaları elektronik hasta kayıtlarından elde edildi ve incelendi. İstatistiksel analizler Statistical Package for Social Sciences for IBM 25 paket programı ile yapıldı. Veri değerlendirmesinde tanımlayıcı istatistik yöntemleri (sayı, yüzde ve aritmetik ortalama vb) ve ki kare testi kullanıldı. Bulgular: Çalışmamızın örneklemini oluşturan 3227 yanık hastasının %55,3’ü 1-5 yaş aralığında ve %52,5’inin erkek olduğu belirlendi. Vakaların %42,7’si 2011-2013 yılları arasında gerçekleşmiştir. Yanıkların %64,1’inin sıcak sıvı yanığı, %50,4’ünün ikinci derece yanık olduğu saptandı. En fazla yanık vakası 2011-2013’te görülmüş ve vakalar 2020’ye doğru azalma göstermiştir. Yanık yaralanmasından en çok etkilenen yaş aralığının 1-5 arası ve en yüksek oranda yanık nedeninin sıcak sıvılar olduğu belirlendi (χ2 =5,560, p<0,01). Sonuç: Yanık vakalarına ait özelliklerin incelenmesi bütünüyle önlenmesi için temel teşkil eder. Bu bağlamda çalışmamızın verileri önemli bir bilgi kaynağı olma özelliğine sahiptir. Yanık hastalarının çoğunlukla 1-5 yaş aralığındaki çocuklarda meydana gelmesi ebeveynlerin desteklenmesi ve çocuk bakımında yardım gereksinimi olduğuna dikkat çekmektedir.Öğe The effects of lockdown measures due to COVID-19 pandemic on burn cases(Wiley, 2020) Akkoç, Mehmet Fatih; Bülbüloğlu, Semra; Özdemir, MehmetIn this study, it was aimed to investigate the effects of lockdown measures implemented due to COVID-19 on aetiology, sociodemographic characteristics, and clinical status of burn cases. This study was carried out retrospectively at the Burn Unit of Dicle University Medical Faculty Hospital. The burn cases during the COVID-19 outbreak were compared with those of the previous 2 years. Statistical analyses were carried out using the IBM SPSS (Statistics Package for Social Sciences) Statistics 25. Descriptive statistics, independent samples t-test, Kolmogorov-Smirnov test, and Shapiro-Wilk test were used for data evaluation. Results were evaluated at 95% confidence interval and P < .05 significance level. It was determined that burn cases were reduced by half during the COVID-19 compared to the previous 2 years. Despite the increase in the number of third-degree burns and surgeries, it was determined that the length of hospital stay decreased by an average of two thirds. Hot liquids have been identified as the most important cause of burns in all years. New studies should be conducted in order to examine the social dimension of COVID-19 pandemic in burn cases and to prevent these cases completely. The short hospital stay preferred by clinicians after COVID-19 and possible problems that may arise should be investigated.Öğe Investigation of two new grafting techniques for dorsal augmentation rhinoplasty: An experimental study with New Zealand white rabbits(Springer, 2024) Özdemir, Mehmet; Akkoç, Mehmet Fatih; Tunik, SelçukIntroduction Cartilage is an important source in supporting the structure of the nose for dorsal augmentation rhinoplasty. However, it is known that its viability is not always on the ideal level. Various wrapping materials are used to increase the strength of cartilage. Donor site morbidity, which develops following the harvesting of both cartilage and fascia as one such cover material, has attracted interest in recent years. Objective In this study, we aimed to investigate the potential of dermis and tendon autografts as alternatives to fascia and cartilage. Material and Method The sample of the study included 16 New Zealand white rabbits. The right auricular cartilage of all rabbits was amputated, and it was transformed into diced cartilage autografts. The dermis autografts from the right gluteal areas of the rabbits were deepithelialized, and lumbosacral fascia autografts were harvested from the same incision. Additionally, the Achilles tendon of each rabbit was harvested and transformed into diced tendon autografts. Four different autografts were embedded under the skin of each rabbit from 4 different pouches opened in the back of the rabbit. These autografts included diced cartilage alone (Intervention 1), fascia-wrapped cartilage (Intervention 2), dermis-wrapped cartilage (Intervention 3) and fascia-wrapped tendon (Intervention 4) autografts. Results Intervention 1 had the most irregular appearance, the outcomes in Intervention 4 were volumetrically smaller and softer. Connective tissue formed between the diced pieces in all interventions, and it was observed that the dermis and fascia had a capsule-like appearance, and their viability was preserved. The differences between the initial and final measurements of the volumes of interventions 1, 2 and 3 were statistically significant (p < 0.05). There was no significant difference between the initial and final volumetric measurements of intervention 4 (p > 0.05). More peripheral proliferation was observed in the interventions of fascia-wrapped and dermis-wrapped diced cartilage compared to the other interventions. The intervention including fascia-wrapped diced tendon grafts had displayed more fibrosis, fragmentation and collagen fibers, while it showed a lower amount of elastic fiber. There were no significant differences among the intervention in terms of other histological parameters. Conclusion Tendon autografts may be a good option for dorsal augmentation rhinoplasty as they are easily harvested and have minimal donor site morbidity. Dermis autograft usage is more advantageous than fascia usage in terms of accessibility and convenience.Öğe Medial canthus reconstruction with a propeller skin flap from the nasolabial fold region(Wolters Kluwer Medknow Publications, 2023) Akkoç, Mehmet Fatih; Özdemir, Mehmet; Bayram, Mehmet; 0000-0002-5714-0499Introduction: The propeller flap taken from the nasolabial flap is well suited for the medial canthal reconstruction. The propeller flap used in one-stage reconstruction is suitable for maintaining the normal concavity of the medial canthus; however, sometimes, the use of the propeller flap can lead to various complications. Aim: In this research article, we aimed to investigate the results of repairing the medial canthus defect using a propeller flap from the nasolabial fold. Materials and Methods: This study was a descriptive and cross-sectional research. We performed this retrospective study with the participation of 37 patients with medial canthal defects who underwent surgical treatment at a research and training hospital in the past 3 years. Data were obtained from the electronic medical records. In patients with medial canthal defects, the results of patients reconstructed with a propeller flap taken from the nasolabial fold were observed. Results: Of the patients, 37.8% were between 65 and 74 years old, and 59.5% were male. 83.8% of the medial defects resulted from the excision of basal cell carcinoma. After repair of the medial canthal defect, venous stasis developed in 8.1% of patients and trapdoor deformity in 13.5% of patients. Patients who developed venous stasis recovered without intervention, and those with trapdoor deformity underwent surgical intervention again. Smokers had a higher risk of venous stasis, and women had a higher risk of developing trapdoor. Conclusion: Successful patient outcomes after surgery are very important in the repair of medial canthal defects. The use of the propeller flap has produced excellent results. However, it is very important to stop smoking during the perioperative process. We recommend more detailed studies in larger sample groups on the development of the trapdoor in women. We conclude that the propeller flap taken from the nasolabial fold is effective and safe in the medial canthal reconstruction.Öğe Neural network approach on loss minimization control of a PMSM with core resistance estimation(Turkiye Klinikleri Journal of Medical Sciences, 2017) Erdoǧan, Hüseyin; Özdemir, MehmetPermanent magnet synchronous motors (PMSMs) are often used in industry for high-performance applications. Their key features are high power density, linear torque control capability, high efficiency, and fast dynamic response. Today, PMSMs are prevalent especially for their use in hybrid electric vehicles. Since operating the motor at high efficiency values is critically important for electric vehicles, as for all other applications, minimum loss control appears to be an inevitable requirement in PMSMs. In this study, a neural network-based intelligent minimum loss control technique is applied to a PMSM. It is shown by means of the results obtained that the total machine losses can be controlled in a way that keeps them at a minimum level. It is worth noting here that this improvement is achieved compared to the case with I d set to zero, where no minimum loss control technique is used. Within this context, hysteresis and eddy current losses are primarily obtained under certain conditions by means of a PMSM Finite element model, initially developed by CEDRAT as an educational demo. A comprehensive loss model with a dynamic core resistor estimator is developed using this information. A neural network controller is then applied to this model and comparisons are made with analytical methods such as field weakening and maximum torque per ampere control techniques. Finally, the obtained results are discussed.Öğe Neuro-fuzzy approach on core resistance estimation at loss minimization control of permanent magnet synchronous motor(Kauno Technologijos Universitetas, 2016) Erdoğan, Hüseyin; Özdemir, MehmetIron losses are among the most significant losses occurring on the Permanent Magnet Synchronous Motor (PMSM). These losses consume active power and cause heat in the iron core. Due to this behavior, they can be represented by an equivalent resistance to make the computations simple. Determining the equivalent core resistance is also a major problem. Computing these lost power is very difficult especially in dynamic applications because these lost power varies by partial differential equations. This study aims to estimate the dynamic core resistance depended on inconstant operating conditions online, and compare the performance of the motor with dynamic versus fixed core resistance at the designed loss minimization algorithm. In order to obtain this estimation, firstly the finite element calculations have been made for many different operating speeds and lost power values were gathered for each speed. Then corresponding core resistance for each power value has been calculated with the dynamic model of a PMSM. Finally, a Neuro-Fuzzy estimator has been designed by computations on the gathered resistance values to estimate the core resistance for different operating conditions. At the end the obtained results are discussed with respect to feasibility of the system.Öğe Prevalence, patient characteristics and treatment selection associated components of maxillofacial fractures: A clinical study(2022) Kapı, Emin; Özdemir, Mehmet; Akkoç, Mehmet FatihThe etiology of maxillofacial fractures is closely related to society and lifestyles, cultural structure, and social values. Various methods are used in maxillofacial fracture surgery, and these methods are determined aesthetically and functionally. In our study, it was aimed to examine in detail the prevalence, patient characteristics, and treatment approach of patients with maxillofacial fractures. This study was carried out retrospectively, based on the records of patients with maxillofacial fractures treated in the last 10 years in our clinic. Descriptive statistics, t-test, and Kolmogorov-Smirnov test were used in data evaluation. The results were evaluated at a 95% confidence interval with a significance level of p<0.05. The total of 700 patients were examined. Most of the patients were between 0 and 30 years old, and their distribution is as follows; 21.9% of them were 0-10 years old, 24.7% of them were 11-20 years old and 24.4% of the patients were 21-30 years old. A total of 700 patients were included in the sample group. It was found that 29.1% of the patients developed maxillofacial fractures due to traffic accidents and 41.7% due to falling from a height. Intermaxillary fixation was applied to 32.1% of the patients, and open reduction internal fixation was applied to 60.7% (n=424) of the patients as a treatment method. Maxillofacial fractures are an important public health problem. Education and preventive practices should be planned at the community level. High-speed causing traffic accidents and not using seat belts should be avoided. Breaking the culture of sleeping on the terrace, specifically to the region where the study was conducted, may be effective in preventing traumas caused by falling from a height. The selection of appropriate treatment methods based on age and psychosocial parameters is very important in determining treatment options.Öğe Rinoplasti için iki yeni greft tekniği: Tavşan modelinde deneysel çalışma(Dicle Üniversitesi, Tıp Fakültesi, 2022) Özdemir, Mehmet; Akkoç, Mehmet FatihGiriş ve Amaç: Dorsum augmentasyonu rinoplastinin zor aşamalarından biridir. Günümüzde burundaki düzensizlikleri gidermek ve dorsumu augmente etmek amacıyla kullanılan kıyılmış kıkırdak greftleri oldukça popüler hale gelmiştir. Kıyılmış kıkırdakları bir arada tutmak, burna istenilen şekli vermek, görünürlüğü azaltmak ve kıkırdak kalitesini arttırmak amacıyla pek çok sarma materyali tarif edilmiştir. Son çalışmalar kıyılmış kıkırdakların fasya ile sarılması durumunda oldukça başarılı sonuçlar elde edilebileceğini göstermiştir. Dermis greftleri hem daha kısa zamanda alınabilmesi hem de çok daha az donör alan morbiditesine yol açması sebebiyle fasyaya alternatif olabilecek niteliktedir. Detaylı literatür taramasına rağmen kıyılmış kıkırdağı sarma amacıyla kullanılan dermis greftine dair veri bulamadık. Yine rinoplastide pek çok otojenik doku, greft amacıyla kullanılmasına rağmen tendon kullanımına dair bir çalışma yoktur. Bu çalışmada, rinoplastide kullanılabilmesi için kıkırdak greftine alternatif olarak tendon grefti ve kıkırdağı sarmak amacıyla dermis grefti olmak üzere tanımladığımız iki yeni greft tekniğinin yaşayabilirliğinin ve kalıcılığının değerlendirilmesi amaçlandı. Gereç ve Yöntem: On altı adet Yeni Zelanda türü beyaz tavşandan iki adet lumbosakral fasya, bir adet dermis grefti, bir adet aşil tendonu alındı. Tavşanların sağ kulağı ampute edildikten sonra, cilt ve perikondriyum uzaklaştırıldı. Kulak kıkırdağı ve aşil tendonu 1 mm küplük parçalar halinde dilimlendi. Dört deney grubu oluşturuldu. Birinci grupta kıyılmış kıkırdak greftleri herhangi bir materyale sarılmadı (A grubu); ikinci grupta kıyılmış kıkırdak greftleri fasya ile sarıldı (B grubu); üçüncü grupta kıyılmış kıkırdak greftleri dermis ile sarıldı (C grubu); dördüncü grupta ise kıyılmış tendon greftleri fasya ile sarıldı. Her tavşanın sırtına dörder adet cilt altı cep oluşturuldu ve greftler ceplere yerleştirildi. On altı haftalık gözlem sonrasında tavşanlar sakrifiye edilip, greftler çıkarıldı. Deney süresince üç tavşan öldüğü için çalışmaya dahil edilmedi (n=13). Makroskobik olarak greftlerin düzenli olup olmadıklarına bakıldı ve hacim değişiklikleri ölçüldü. Histolojik inceleme için preparatlar Hematoksilen-Eozin, Masson trikrom ve Van Gieson ile boyandı. İstatistiksel anlamlılık sınırı olarak p<0.05 kabul edildi. Bulgular: Canlı kalan on üç tavşanda greftlerin yerinde olduğu ve hiçbir greftte total rezorpsiyon olmadığı izlendi. Kıyılmış kıkırdak, fasya ile sarılmış kıyılmış kıkırdak ve dermis ile sarılmış kıyılmış kıkırdak gruplarında hacim artışı olduğu ve bu üç gruptaki hacim değişimi kıyaslandığında aralarında anlamlı bir fark olmadığı izlendi. Fasya ile sarılmış kıyılmış tendon grubunda ise bir miktar hacim azalması tespit edildi, ancak bu değişim istatistiksel olarak anlamlı bulunmadı. Fasya ve dermis ile sarılmış kıyılmış kıkırdak gruplarında periferal proliferasyon daha yüksek izlendi. Fasya ile sarılmış kıyılmış tendon grubunda fibrozis, fragmentasyon ve kollajen lif miktarının daha fazla olduğu, elastik lif miktarının ise daha düşük olduğu tespit edildi. Diğer histolojik parametreler açısından gruplar arasında anlamlı fark görülmedi. Sonuç: Çalışmadan elde edilen bulgular sonucunda dermis ile sarılmış kıyılmış kıkırdak greftleri ile kıyılmış tendon greftleri başta dorsum augmentasyonu olmak üzere, rinoplasti operasyonları için iyi birer alternatif olabilir. Bu tekniklerin insanda klinik kullanımı için daha fazla çalışma yapılması gerekmektedir.
