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Öğe An Alternative Agreement Statistics With Linear Weight Between Ordinal Categorical Measurements(Hacettepe Univ, Fac Sci, 2010) Semiz, Mustafa; Ocak, BengüAccurate and precise measurement is an important issue in any study and in any scientific area. Weighted kappa, proposed by J. Cohen (Weighted kappa: Nominal scale agreement with provision for scaled disagreement or partial credit, Psychological Bulletin 70, 213-220, 1968) is the most common and widely preferred coefficient for measuring agreement between two ordinally measured categorical variables. This article presents an alternative agreement coefficient between ordinal categorical measurements. The proposed coefficient takes values between 0 and 1. Therefore, the interpretation and the calculation of the proposed coefficient are also very simple. An SPSS Syntax program for the proposed coefficient and the weighted kappa is presented.Öğe Antibacterial Activity of a New Endodontic Sealer Against Enterococcus Faecalis(Canadian Dental Assoc, 2006) Bodrumlu, Emre; Semiz, MustafaAim: The purpose of this study was to test a new root canal sealer ( Epiphany) and 5 other root canal sealers ( Diaket, Endomethasone, AH 26, Sealapex, Sultan) for their antimicrobial effect on Enterococcus faecalis. Materials and Methods: The antimicrobial effect of 6 root canal sealers was tested by the agar diffusion method. The freshly mixed sealers were placed in prepared wells of agar plates inoculated with E. faecalis. All plates were incubated for 72 hours at 37 degrees C under aerobic conditions, and zones of inhibition were measured at 24, 48 and 72 hours. Results: All of the sealers caused bacterial growth inhibition. Their effectiveness, in descending order of antimicrobial activity, was as follows: Endomethasone, Sultan, Sealapex, Diaket, Epiphany and AH 26. Epiphany sealer had little effect on the tested microorganism. The effectiveness of the root canal sealers decreased marginally with greater duration of incubation. Conclusions: The Epiphany root canal sealer offered no antibacterial advantage over the other sealers tested.Öğe The antimicrobial and antifungal efficacy of tetracycline-integrated gutta-percha(Medknow Publications, 2008) Bodrumlu, Emre; Alaçam, Tayfun; Semiz, MustafaThe purpose of this study was in vitro evaluation of the antimicrobial and antifungal efficacy of commercially available gutta-percha containing tetracycline on some potential endodontic pathogens. The test microorganisms were Enterococcus faecalis, Pseudomonas aeruginosa, Staphylococcus aureus, Porphyromonas endodontalis, and Candida albicans. Tetracycline-integrated gutta-percha (TGP) cones, tetracycline disc, and conventional gutta-percha cones of the same size were placed on the inoculated plates. The plates were incubated at 37°C aerobically or anaerobically. Growth inhibition zones on each plate were inspected at 24, 48, and 72 h. Tetracycline disc and TGP cones inhibited all the tested bacterial strains, however the greatest antimicrobial effect was seen on S. aureus. Tetracycline disc and TGP seemed less effective on E. faecalis and P. aeruginosa. However, all tested treatments were unable to affect C. albicans. Based on the results of this study, it seems that TGP offers an antimicrobial advantage over conventional gutta-percha.Öğe Determination of Compromise Integer Strata Sample Sizes Using Goal Programming(2004) Semiz, MustafaThis article deals with the determination of compromise integer strata sample sizes using goal programming in multivariate stratified sampling. Firstly, the problem of determining optimum integer strata sample sizes is formulated for the univariate case, and then based on these individual optimal solutions, individual goal variances are calculated. A new compromise criteria is defined for the goal programming approach based on predetermined or calculated goal variances. It is shown that the proposed approach provides relatively more efficient and feasible compromise integer strata sample sizes for multivariate surveys.Öğe Efficacy of 3 Techniques in Removing Root Canal Filling Material(CANADIAN DENTAL ASSOC, 2008) Bodrumlu, Emre; Uzun, Oezguer; Topuz, Oezguer; Semiz, MustafaObjective: Retreatment of a root canal in the case of infection requires complete removal of previous filling material. This study evaluated the efficacy of 3 techniques in removing laterally compacted Resilon/Epiphany and gutta-percha/AH Plus from straight and curved canals during retreatment. Materials and Methods: Extracted human teeth (90 maxillary anterior teeth with single, straight root canals and 90 mandibular molars with mesial canal root curvatures of 20 to 35) were divided into 6 groups each consisting of 15 straight and 15 curved root canals. Three groups were obturated using gutta-percha/AH Plus and 3 were obturated with Resilon/Epiphany. After 3 weeks storage at 37 degrees C and 100% humidity, all root canal fillings were removed using a Gates Glidden drill, a Gates Glidden drill plus chloroform or a System B device. Results: For all removal techniques, specimens obturated with gutta-percha/AH Plus showed significantly more remnants of obturation material than specimens filled with Resilon/Epiphany for both straight and curved canals (p < 0.05). Removal time was shorter for Resilon/Epiphany than gutta-percha/AH Plus filling for all techniques and for both curved and straight canals. The Gates Glidden drill and Gates Glidden drill plus chloroform removal techniques were significantly faster than the System B technique for both straight and curved canals. The Gates Glidden drill technique was best for straight canals, whereas the Gates Glidden drill plus chloroform was the best technique for curved canals when removing Resilon/Epiphany sealer. Conclusions: Removal of Resilon/Epiphany filling resulted in fewer remnants and was faster than gutta-percha/AH Plus removal using a Gates Glidden drill with or without chloroform in both straight and curved canals.Öğe Hölder Eşitsizliğiyle Tabakalı Tesadüfi Örneklemede En Uygun Paylaştırma(Selçuk Üniversitesi Fen-Edebiyat Fakültesi, 2003) Semiz, Mustafa; Alhan, Aslıhan; Genç, AşırBilindiği gibi tabakalı tesadüfi örneklemede en uygun paylaştırma yöntemi üç farklı yaklaşımla ele alınır. Bu yöntemler Lagrange Çarpanlar tekniği, doğrusal yada doğrusal-olmayan optimizasyon teknikleri ve eşitsizlikler olarak bilinir. Bu çalışmamızda her zaman kullanılan toplam örnekleme maliyeti fonksiyonunu daha esnek bir fonksiyonla tanımlayarak ve Hölder eşitsizliği ile en uygun paylaştırma için örnek hacmini ve tabaka örnek hacimlerini belirleyen formülleri gösterdik. Görüldüğü gibi bu formüller hesaplama kolaylığı sağlar.Öğe Localization of Mental and Mandibular Foramens on the Conventional and Digital Panoramic Images(COLLEGIUM ANTROPOLOGICUM, 2009) Peker, Ilkay; Gungor, Kahraman; Semiz, Mustafa; Tekdemir, IbrahimThe purpose of this study was to compare the efficiency of conventional and digital panoramic images for localization of mental and mandibular foramens. Six dry edentulous human mandibles were used in the study. Conventional and digital panoramic images were obtained and the vertical and horizontal measurements were performed for localization of mental and mandibular foramens on the images. The correlations between radiographic (conventional and digital) and direct measurements were compared. A measurement error between the radiographic and direct measurements was determined at the level of 1 mm. The measurement errors were generally less in conventional panoramic radiography than digital one. There was statistically strong positive correlation between direct and radiographic measurements. Statistically significant difference was found between radiographic and direct measurements for bone height of mandible in ramus region. According to the results of this study, diagnostic performance of conventional and digital panoramic images seems to be equal for the localization of mental and mandibular foramens. The vertical radiographic measurements are generally reliable and correlated with direct measurements in mandible for conventional and digital panoramic radiography, but the evaluation of bone height in ramus region may not be sufficiently reliable.Öğe A Radiographic Study of Location of Mental Foramen in a Selected Turkish Population on Panoramic Radiograph(Collegium Antropologicum, 2006) Güngör, Kahraman; Öztürk, Mustafa; Semiz, Mustafa; Brooks, Sharon LynnPurpose of this study was to investigate the most common position of the mental foramen in a selected Turkish population. The study sample included three hundred and sixty one panoramic radiographs of selected Turkish population taken in Faculty of Dentistry, University of Gazi. The most common position of the mental foramen was between the first premolar and the second premolar (71.5%). The mental foramen was symmetrical in 90.4% of patients. In this study, the difference of the location of the mental foramen in different ethnics groups was discussed. Clinicians and anthropologists should expect to find the position of the mental foramen to be symmetrical and between the first premolar and the second premolar teeth.Öğe Reproducibility and Agreement of Clinical Diagnosis of Occlusal Caries Using Unaided Visual Examination and Operating Microscope(2009) Zafersoy Akarslan, Zühre; Erten, Hülya; Uzun, Özgür; Semiz, MustafaAim: To assess the reproducibility of clinical diagnosis of occlusal caries using unaided visual examination and examination with an operating microscope (16× magnification) and to determine the agreement between these 2 methods. Materials and Methods: Three experienced dentists used unaided visual examination and an operating microscope to grade, according to a standard caries rating scale, a total of 299 occlusal surfaces in 112 subjects (mean age 28.3 years, standard deviation 0.5 years), during several examination sessions. Intraobserver and interobserver reproducibility was calculated, and agreement in diagnosis of the same teeth by different methods was also determined. Results: The level of intraobserver agreement for the 2 modes of clinical diagnosis was substantial, as indicated by kappa values; however, there was substantial interobserver variability with both techniques. Agreement in clinical diagnosis between the 2 techniques was 62.5% for observer 1 (kappa = 0.483), 65.4% for observer 2 (kappa = 0.531) and 63.5% for observer 3 (kappa = 0.508) (p = 0.001). Conclusions: Intraobserver agreement with the operating microscope and with unaided visual examination was roughly the same, but interobserver agreement was low with both techniques. For some surfaces, the diagnosis made by a particular observer with unaided visual examination differed from that made with microscopic examination. The diagnoses differed most frequently for surfaces that were scored as sound with unaided visual examination.Öğe The role of meteorologic factors and air pollution on the frequency of pediatric epistaxis(SAGE PUBLICATIONS INC, 2018) Akdoğan, M. Volkan; Hizal, Evren; Semiz, Mustafa; Topal, Özgül; Akkaş, Hakan; Kabataş, Aydın; Erbek, Selim S.Fluctuations in atmospheric temperature, humidity, and air pollution are associated with the incidence of epistaxis. To date, no study in the literature has evaluated the effect of air pollution and meteorologic conditions on the pediatric population. We aimed to evaluate the effect of meteorologic factors and air pollution on the frequency of epistaxis in children. Children presenting to an outpatient clinical setting at a tertiary care hospital during a 5-year period ( July 1, 2009, to June 30, 2014) and diagnosed with epistaxis formed the study population. Daily temperature and humidity parameters and average daily atmospheric water vapor pressure, average daily concentration of particulate matter < 10 mu m in diameter, and sulfur dioxide readings were obtained. The distribution of daily parameters was analyzed. Of the 1,559 children with the primary diagnosis of epistaxis, data from 1,330 children were analyzed after excluding patients with coexisting pathologies. Positive correlations were found between the frequency of epistaxis and both the average daily temperature and the difference between the maximum and minimum daily temperature. There was a negative correlation between the epistaxis frequency and the average daily humidity, the difference between the maximum and minimum daily humidity, the average daily concentration of particulate matter, and the sulfur dioxide levels. Our findings suggest that epistaxis in children is related to high temperatures and low humidity.Öğe The role of optic nerve ultrasonography in the diagnosis of elevated intracranial pressure(B M J PUBLISHING GROUP, 2007) Girisgin, Abdullah Sadik; Kalkan, Erdal; Kocak, Sedat; Cander, Basar; Gul, Mehmet; Semiz, MustafaObjective: To evaluate the convenience and utility of optic nerve ultrasonography ( ONUS) in the evaluation of emergency patients with elevated intracranial pressure (EICP) due to traumatic or non-traumatic causes. Methods: This study was conducted between May 2005 and December 2005 in the emergency department of Meram Faculty of Medicine, Selcuk University. Patients with traumatic or non-traumatic EICP were included in the study. Among these, 28 patients with EICP determined on cranial computed tomography (CCT) and a control group of 26 patients with no disease had the vertical and horizontal diameters of the optic nerves (ONs) of both eyes measured by ultrasonography ( US). The measurements were done by wetting the closed eyelids and using a 7.5-MHz linear probe. Results: Horizontal and vertical diameters of both ONs of the 54 patients were measured and the averages calculated. The mean (SD) ON diameter for the group suspected of having EICP was found to be 6.4 (0.7) mm, and that for the control group to be 4.6 (0.3) mm. In the statistical analysis carried out between these two groups (t test), the difference was found to be significant at p< 0.001. Conclusions: In detection and follow-up of EICP cases, such as cerebrovascular accident and trauma, ONUS is a practical, risk-free, inexpensive, convenient and, if performed by experts, reliable method. As a result, although CCT may be more useful in diagnosis, ONUS may be more efficient in detecting EICP. In those cases where CCT and other conventional imaging methods are not available, ONUS can facilitate the diagnosis and help in treatment.Öğe Yığın Hacminin Tahmini İçin Bulanık Doğrusal Regresyon Modelinde Ters Tahmin Metodu(Selçuk Üniversitesi Fen-Edebiyat Fakültesi, 2003) Genç, Aşır; Semiz, MustafaBu çalışmada yığın hacminin tahmini için farklı bir yaklaşım sunulmaktadır. Yığın hacminin tahmini için yakalama-tekrar yakalama yöntemiyle elde edilen bağımlı ve bulanık gözlemlere dayanan ters tahmin yönteminde bulanık doğrusal regresyon modelleri önerilmektedir. Bu çalışmada, iki farklı bulanık model bir örnek üzerinde tartışılmış ve bu modeller için varsayımlar belirlenmiştir.
