Cemal Atakan

• Professor
• Professor at Ankara University

This retrospective study is aimed at developing a web-based artificial intelligence (AI) software (DiagnoCat) for periodontal bone loss detection on panoramic radiographs and evaluating the model's performance by comparing it with clinicians' results. Separate models are trained for tooth and periodontal bone loss detection. The first model's objec...

This retrospective study is aimed at developing a web-based artificial intelligence (AI) software (DiagnoCat) for periodontal bone loss detection on panoramic radiographs and evaluating the model's performance by comparing it with clinicians' results. Separate models are trained for tooth and periodontal bone loss detection. The first model's objec...

Objectives: This study aims to evaluate the reliability of AI-generated STL files in diagnosing osseous changes of the mandibular condyle and compare them to a ground truth (GT) diagnosis made by six radiologists. Methods: A total of 432 retrospective CBCT images from four universities were evaluated by six dentomaxillofacial radiologists who id...

Objectives: The aim of this study was to investigate the impact of serious game training on the performance of undergraduate dental students during basic life support (BLS) training. Methods: Students at the Ankara University Faculty of Dentistry were divided into two groups at random: Serious Game (SG) (n = 46) and Traditional (Tr) (n = 45). St...

Objective The aim of this study is to assess the effects of metal artifact reduction (MAR) and adaptive image noise enhancer (AINO) in CBCT imaging on the detection accuracy of artificially created fenestration defects in proximity to titanium and zirconium implants in sheep jaw.Methods Six zirconium and 10 titanium implants were planted on mandibu...

PurposeThis study aims to analyze alveolar bone height (ABH) in the maxillary molar area according to the anatomical relationship between maxillary sinus and maxillary molar teeth via cone beam computed tomography images.Methods In 330 patients, 660 maxillary first molar (M1) and 648 maxillary second molar (M2) were evaluated. ABH measurements were...

The purpose of the present study was to investigate the vitality aspect of mandibular fractures using micro-CT in the analysis of bone mineral density and other bone microstructure trabecular parameters in the postmortem interval. This study included 72 female Wistar rats. In the study groups, the rats’ mandibles were first fractured and after thre...

Turkey is located in the temperate zone; thus, it is influenced by regionally different air masses during summers and winters, resulting in different precipitation regimes. Often, systems with varying masses of air repeatedly affect Turkey; however, at times, these periods are disrupted and difficult to predict. This study analyzes whether a certai...

Background To examine the influence of voxel sizes to detect of peri-implant fenestration defects on cone beam computed tomography (CBCT) images. Materials and methods This study performed with three sheep heads both maxilla and mandible and two types of dental implant type 1 zirconium implant (Zr ⁴⁰ ) ( n = 6) and type 2 titanium implant (Ti ²² )...

Amaç: Adli antropolojide iskelet kalıntılarının değerlendirilmesinde en önemli adımlardan biri cinsiyetin doğru tespit edilmesidir. Şekli, morfolojik yapısı ve gelişim süreci her bireyde farklılık gösteren frontal sinüsün radyolojik yöntemlerle görüntülenmesi, bireylerin cinsiyetlerinin belirlenmesine olanak sağlar. Çalışmamızda, konik ışınlı bilgi...

Objectives: The goal of the study is to evaluate the prevalence and characteristics of soft tissue calcifications (STCs) detected in the mandibular region in CBCT images. Methods: 242 (150 female, 92 male) mandibula CBCT images were evaluated in this study. Prevalence, anatomical location, pattern (bilateral or unilateral), size (mm), number (singl...

Objectives The aim of this study was to assess the effect of a metal artifact reduction (MAR) algorithm and the adaptive image noise optimizer (AINO) optimization filter in the detection of peri-implant dehiscences with cone beam computed tomography (CBCT). Study Design Nine implants (3 zirconium, 3 titanium, and 3 zirconium-titanium) were placed...

Günümüzde üniversiteler, eğitim-öğretim, araştırma ve uygulama faaliyetleri içerisinde bulunabilmek için bilimsel bilgiye en doğru ve en hızlı biçimde ulaşmayı hedeflemektedir. Bundan dolayı, Ankara Üniversitesi akademik personelinin bilimsel bilgiye erişim için çağdaş bilgi ve iletişim teknolojilerini kullanması kaçınılmazdır. Bilimsel her veri ta...

In this study, the use of the Markov chain to measure the change in time-dependent transitions is emphasized. Contingency tables were used to measure the time-dependent change of categorical data. Theoretically how to apply the Markov chain in the log-linear model with the help of one-step or higher-step transition matrices was demonstrated. In add...

The primary goal of this study is to remind, emphasize and revive the ideas of C. Radhakrishna Rao, inscribed in his words “Chance deals with order in disorder while chaos deals with disorder in order”. We will focus upon some concepts such as randomness, probability measure, chaos, fractals, random sequences and complexity. Deterministic phenomena...

Objective: Maxillary sinus ostium is the top section of the medial wall the and is hence poorly placed from the point of view of free drainage; it opens into the narrow ethmoidal infundibulum, inflammation of which can further break drainage, so this may cause in the development of chronic maxillary sinusitis. This study aims to evaluate maxillary...

Objective. is study aimed at finding out whether the 3 mm thickness of stabilization splints has positive or negative effects on all temporomandibular disorder (TMD) symptoms. Materials and Methods. e statistical calculation included 25 (22 females; 3 males) TMD patients who received 3 mm thickness stabilization splint therapy. ey were evaluated ac...

Objective: To examine the nasopalatine canal (NPC) anatomical and volumetric measurements in anterior edentulous (AE) and anterior dentate (AD) individuals and to compare these findings according to sex, age, shape, and severity of resorption in the premaxilla. Methods: Two hundred cone beam computed tomography images were divided into 2 groups: A...

Objectives: The goal of this retrospective study is to evaluate the radiologic anatomy of sphenoidal emissary foramen (SEF) by using cone-beam computed tomography (CBCT) scans. Methods: Three hundred seventeen (189 female and 128 male) fullhead CBCT images were evaluated in this study. Incidence, diameter, shape, confluence to foramen ovale, and di...

Objective: This study was performed to evaluate the trabecular pattern of patients with cancer taking bisphosphonates on panoramic images using fractal dimension (FD) analysis by comparison with healthy subjects and to assess whether any difference exists between regions. Methods: FD analysis was conducted using ImageJ 1.3 software (National Ins...

Objectives: The goal of this retrospective study is to evaluate the radiologic anatomy of sphenoidal emissary foramen (SEF) by using cone-beam computed tomography (CBCT) scans. Methods: Three hundred seventeen (189 female and 128 male) full-head CBCT images were evaluated in this study. Incidence, diameter , shape, confluence to foramen ovale, and...

Objectives: To assess the maturation stages of permanent maxillary and mandibular 2nd and 3rd molar teeth according to age and establish any relation of congenital absence of 3rd molar regarding maturation stages of 2nd molars. Material and Methods: Digital panoramic radiographs present in the archive of the radiology department taken from 1070 pat...

The variability in the averages of the monthly rainfall in Turkey’s seven different climate regions was examined using a principal component analysis (PCA) biplot and a canonical variate analysis (CVA) biplot to analyse meteorological data from 81 stations in the country over a period of January 1970–December 2010. Using biplots as visuals for anal...

Principal component analysis (PCA) is a popular technique that is useful for dimensionality reduction but it is affected by the presence of outliers. The outlier sensitivity of classical PCA (CPCA) has caused the development of new approaches. Effects of using estimates obtained by expectation-maximization - EM and multiple imputation - MI instead...

This study was performed to assess the effects of different imputation methods on the performance of a biplot technique. We selected the Fisher's iris data as our reference dataset. Some elements of the Iris data were deleted in different rates under missing at random (MAR) assumption to generate incomplete datasets which had 3.5%, 7%, %15, 20% mis...

Objectives: To compare the three non-steroidal anti-inflammatory agents (NSAIDs) diclofenac potassium, etodolac and naproxen sodium in relation to pain, swelling and trismus following impacted third molar surgery. Study Design: The study was a randomized and a double-blinded study which included 42 healthy young individuals with impacted third mola...

In this study we tried to bring out the importance of two methods used for visualizing multicollinearity diagnostics. The first method is called Tableplot (see Friendly and Kwan, 2009). Through this technique, multicollinearity diagnostics ideas are combined with a visualizing approach. The second method is called Biplot (see Gabriel, 1971; Gower a...

Graphical approaches are widely used in the examination of multivariate data. The most popular of them is called Biplot. This technique provides an geometric approach that examined the relations between observations and variables in the principal components space with reduced-size. Principal component analysis (PCA) is obtained by covariance (or co...

Weibull dağılımı, bir çok alanda istatistiksel sonuç çıkarımı yapmak için kullanılan çarpık bir dağılımdır. Bu çalışmada, tek değişkenli iki parametreli Weibull dağılımına sahip kitlelerde sınıflandırma problemi, kitle parametrelerinin bilinip bilinmemesi durumları göz önüne alınarak incelenmiştir. Hata oranları önerilen sınıflandırma kuralları kul...

Adequate intake (AI) of choline as part of the daily diet can help prevent major diseases. Low choline intake is a major risk factor for liver and several neurological disorders. Extreme choline consumption may cause diseases such as hypotension, sweating, diarrhea, and fishy body odor. The AI of choline is 425 mg/day for adult women; higher for pr...

Optimal planning of the health workers is of vital importance for a country. Distribution of health workers among provinces in emerging markets is an important development criterion. In this study, biplot graphical approach is used to determine the distribution of health workers. The results of biplot analysis point out that the distribution of the...

In this study, bootstrap percentile confidence intervals for the actual error rate have been obtained with respect to the bootstrap estimated values of the estimators D, DS, L, LS, O, OS and M . Estimated values for these estimators have been obtained by a simulation study for two multivariate normal populations with different mean vectors and a co...

Adequate intake of fruits and vegetables as part of the daily diet may help prevent major diseases. Low fruit intake is a major risk factor for cancer, coronary heart disease and stroke. The World Health Organization recommends eating at least five portions of a variety of fruit, which is nearly 400 g/day. Essential nutrients, water, carbohydrates,...

In this article we have tried to assess the possible relationships between shuttle trade and the expletory variables, export (f.o.b.), import (c.i.f.) and CPI based real effective US dollar exchange rate. We employed monthly data of Turkey covering the years from 1996:01 to 2006:12 and forecasted the parameters by Ordinary Least Square (OLS) estima...

A citation is one of the major measures that evaluates the scientific journals reputability, reliability and usability in the international arena. The rate of the citation of a journal is a significant criterion for that particular journals scientific evaluation. Together with the scientific value of the journal, the citations used in an article ar...

Purpose – The purpose of this paper is to encompass the assessment of the effectiveness of the digital library and the value of multidisciplinary databases in terms of user preferences and use frequency by academic ranking. Design/methodology/approach – This paper compares the results of two survey questionnaires carried out in 2002 and 2005. It e...

There are frequent discussions on the assumption that, the fingerprints of monozygote twins are the same or similar as their DNA structures or namely their genetic codes. The aim of this study is to examine the fingerprints of monozygotes in detail to prove the results scientifically. In this research, the fingerprints of 10 pair of monozygotes wer...

Energy is one of the basic micro dynamics of the general economy. Turkey as one of the candidate countries to the European Union is dependent on the petroleum and natural gas as the member states. Along with this, Turkey should turn to other energy sources bethinking the high population increase. In this article, we have investigated the relationsh...

The development in information and communication technologies has changed and improved resources and services diversity in libraries. These changes continue to develop rapidly throughout the world. As for our country,remarkable developments, especially in university and special libraries, in this field are worth consideration. In order to take bene...

This paper analyzes possible cointegration relations among the sub-indexes of the Istanbul Stock Exchange series - services sector, industry sector and financial sector - for the period from February 1, 1997 to September 24, 2003. The data is analyzed by using various methods initiated by Engle and Granger (1987), Johansen (1988) and Akdi (1995). T...

Available information on the dimensions of the enamel and pulp tissues of tooth structure, as well as their correlation with chronologic age, is limited. However, this information is a significant determinate in planning the tooth reduction for a porcelain laminate veneer (PLV) restoration. This study examined variations in tooth enamel thickness a...

In practice, a distribution free rule R N that is based on Fisher’s linear discriminant function is commonly used in classification problems. For normal populations R N is optimal with respect to the probability of misclassification. In this study, univariate classification problem is considered for gamma populations. It is shown that the optimal r...

Some known smoothed error rate estimators in discriminant analysis are compared by a simulation study for two multivariate normal populations.

This study discusses dependence of binary variables in the use of discrete discriminant analysis. In the literature, such models as log-linear and Bahadur have been compared with respect to their number of parameters involved. The model that has a minimum number of parameters is considered as the best model. Sometimes, models with the minimum param...

The development in information and communication technologies has changed and improved resources and services diversity in libraries. These changes continue to develop rapidly throughout the world. As for our country, remarkable developments, especially in university and special libraries, in this field are worth consideration. In order to take ben...