Kaan Orhan

Ankara University · Department of Dentomaxillofacial Radiology

Introduction Artifacts in cone-beam computed tomographic (CBCT) imaging may compromise radiodiagnosis. Obturation materials for endodontic treatment may present with variable material density and thus also cause distinct artifact expression. The aim of this study was to assess the volume distortion artifact of root canal sealers using CBCT devices...

The objective of the present study was to test the hypothesis that the addition of hyaluronic acid-based matrix to collagenated heterologous bone graft for sinus augmentation would enhance bone formation compared to collagenated heterologous bone graft alone in the early healing period, by micro-computed tomography and histomorphometry. Thirteen sy...

BACKGROUND: The purpose of this analysis was to evaluate the displacement patterns of the maxilla under parallel and rotational setbacks using the finite element method (FEM). MATERIAL AND METHODS: A three-dimensional (3D) finite element model of a hemimaxilla was constructed. Through a conventional Le Fort I osteotomy, 2 and 3 mm of posterior move...

ObjectiveCBCT applications have received widespread acceptance in dentistry. CBCT scans provide three-dimensional information on anatomic structures and characteristics of pathologies, rather than the two-dimensional information obtained with the conventional techniques. The purpose of this study was to evaluate incidental findings in out-of-intere...

Objectives To review the past 10 years of research in the diagnostic accuracy of magnetic resonance imaging (MRI) and clinical signs of temporomandibular joint (TMJ) disorders with pain, sound, and function limitation in the existing literature. MethodsA review of the literature was performed to search for all articles published between 2006 and 20...

This study aimed to develop an algorithm to automatically segment the oral potentially malignant diseases (OPMDs) and oral cancers (OCs) of all oral subsites with various deep convolutional neural network applications. A total of 510 intraoral images of OPMDs and OCs were collected over 3 years (2006-2009). All images were confirmed both with patie...

The morphology of the finger bones in hand-wrist radiographs (HWRs) can be considered as a radiological skeletal maturity indicator, along with the other indicators. This study aims to validate the anatomical landmarks envisaged to be used for classification of the morphology of the phalanges, by developing classical neural network (NN) classifiers...

The assessment of alveolar bone loss, a crucial element of the periodontium, plays a vital role in the diagnosis of periodontitis and the prognosis of the disease. In dentistry, artificial intelligence (AI) applications have demonstrated practical and efficient diagnostic capabilities, leveraging machine learning and cognitive problem-solving funct...

Objective: To evaluate whether there was a relationship between the degenerative bone changes and bone quality of the mandibular condyle and articular eminence in patients with temporomandibular disorder (TMD). Methods: The study group consisted of 100 patients with TMD. “Diagnostic Criteria/TMD” was used to identify the pathologies. Degenerative b...

This study aims to compare the shaping efficiency of the nickel-titanium instrument systems , One Reci and ProTaper Ultimate, using micro-CT (micro-computed tomography) in traditional and conservative endodontic access cavities. The experimental groups were formed according to the type of access cavity and Ni-Ti file system to be used. Sixty mandib...

Purpose The aim of this study is to morphometrically and morphologically examine the occipital condyle, which is an important anatomical region in terms of surgery and forensic medicine, and its surrounding structures, to evaluate the change in mean values according to gender and age, and to evaluate the correlation of the measurements obtained. M...

Vertical root fractures (VRFs) can start at any level of the root and progress longitudinallyto the coronal attachment. This study aimed to investigate the effects of different exposure parameters used when obtaining CBCT scans in detecting simulated VRFs. Hence, 80 intact human mandibular single-rooted pre-molar teeth without root fractures were i...

Purpose: To evaluate the effect of maxillary sinus anatomy on sinus floor elevation (SFE) operations performed with the lateral window approach. Materials and Methods: CBCT and digital panoramic radiographs were evaluated before and at least 6 months after maxillary sinus floor elevation (SFE) operations performed in 33 maxillary sinus regions in 2...

Background: The aim of our study is to provide successful automatic segmentation of various objects on orthopantomographs (OPGs). Methods: 8138 OPGs obtained from the archives of the Department of Dentomaxillofacial Radiology were included. OPGs were converted into PNGs and transferred to the segmentation tool's database. All teeth, crown-bridge...

Objective To evaluate changes in the masseter muscle after orthognathic surgery using electromyography (EMG), ultrasonography (US), and ultrasound elastography (USE) in individuals with skeletal class III anomaly over long-term follow-up and compare with a control group. Materials and methods The study group included 29 patients with class III den...

Purpose: This study aimed to assess texture analysis (TA) of cone-beam computed tomography (CBCT) images as a quantitative tool for the differential diagnosis of odontogenic and non-odontogenic maxillary sinusitis (OS and NOS, respectively). Materials and Methods: CBCT images of 40 patients diagnosed with OS (N=20) and NOS (N=20) were evaluated. Th...

Background: Cone-beam computed tomography (CBCT) is used to provide multiplanar views of the temporomandibular joint (TMJ) bone components as well as TMJ pathologies without superposition, magnification or distortion. Objectives: The study aimed to analyze degenerative changes in the condylar surface, and their relationship with patient age and...

Intro : Removal of bacterial plaque and stains are a crucial part of non-surgical periodontal treatment. Following scaling, polishing by air-powdered devices is widely used. The aim of this study is to evaluate the changes caused by three different air-powder abrasives from the same company (sodium bicarbonate, glycine, and erythritol) on the ename...

Purpose: To examine the changes of dentoalveolar structures and pathologies in the maxillary sinus before and after dental implant surgery alone or with direct vs indirect sinus lifting using CBCT images of the maxillary posterior region. Materials and methods: Preoperative and postoperative CBCT images of 50 sinus sites and the alveolar bone ar...

Radiographic determination of the bone level is useful in the diagnosis and determination of the severity of the periodontal disease. Various two- and three-dimensional imaging modalities offer choices for imaging pathologic processes that affect the periodontium. In recent years, innovative computer techniques, especially artificial intelligence (...

The aim of this study was to compare two different imaging methods by assessing changes caused by sodium bicarbonate and glycine air polishing on the tooth surfaces. Fourteen single root teeth with exposed root surfaces were included into the study. The teeth were randomly divided into two groups: sodium bicarbonate and glycine group. Samples were...

Commonly utilized techniques for healing alveolar bone destruction such as the use of growth factors, suffering from short half-life, application difficulties, and the ability to achieve bioactivity only in the presence of high doses of growth factor. The sustained release of growth factors through a scaffold-based delivery system offers a promisin...

Introduction Deep learning methods have recently been applied for the processing of medical images, and they have shown promise in a variety of applications. This study aimed to develop a deep learning approach for identifying oral lichen planus lesions using photographic images. Material and Methods Anonymous retrospective photographic images of...

Abstract: The present study aimed to measure and compare anatomic parameters in contralateral maxillary second molars. A total of 18 intact maxillary second molar pairs (n = 36) extracted from 18 patients were scanned with micro-computed tomography (micro-CT) and then reconstructed. Axial, sagittal, and cross-sectional slices were used to analyze t...

This study aims to develop an algorithm for the automatic segmentation of the parotid gland on CT images of the head and neck using U-Net architecture and to evaluate the model's performance. In this retrospective study, a total of 30 anonymized CT volumes of the head and neck were sliced into 931 axial images of the parotid glands. Ground truth la...

Objective To compare the immediate effects of a single session of manual therapy (MT) or Kinesio taping following MT (KTMT) in patients with bruxism using shear wave ultrasonography. Methods Twenty patients were included in the MT group (mean age 27.3 ± 4.8), and 19 patients were included in the KTMT group (age mean 26.2 ± 5.4), randomly. Muscle t...

Objective: To evaluate occlusal splint type differences in patients with bruxism. Methods: Seventeen controls and 51 patients were divided into three subgroups, each assigned to use a different occlusal splint (hard, soft, or semi-soft) for 3 months and assessed by ultrasonography and electromyography (EMG) before (BT) and 3 months after treatme...

Background: Bruxism is defined as recurrent masticatory muscle activity. Although there is not an agreed treatment method for bruxism, the application of botulinum toxin A (BT‑A) has become a reliable lately. This study aimed to evaluate the correlation between the changes in masseter muscle thickness and clenching habits in bruxism patients treate...

Purpose The purpose of this retrospective study was to assess the prevalence and morphometric features of the mastoid foramen (MF) and mastoid emissary canal (MEC) using cone-beam computed tomography (CBCT), as well as their relationship with age, sex, and side. Methods CBCT scans of 500 patients aged 8–87 years were examined retrospectively. The...

Objectives This study aimed to investigate the morphometric features of the stylomastoid foramen (SMF) and the facial canal in the Turkish population using cone-beam computed tomography (CBCT) retrospectively. Methods The randomly selected 479 patients aged from 8 to 87 years were examined, and a total of 958 CBCT images of the SMF and facial canal...

Amaç: Bu çalışmanın amacı Universal Ti-Base ve deneysel CrCo-Base desteklerin kullanımında implant-destek bağlantısının in-vitro yükleme karşısındaki biyomekanik davranışlarını karşılaştırmaktır. Gereç ve Yöntem: Bu çalışmada iki farklı çapta (3,5 ve 4,8 mm) kemik seviyeli implant kullanılmıştır. Bir gün arayla iki kez 30 Ncm değerle torklanan dest...

Abstract: We aimed to evaluate the impact of Virtual Reality Dental Simulators (VRDS) on preclinical training in endodontics for undergraduate dental students. Purposive sampling technique was used to target undergraduate dental students at two dental schools: in Qatar and Turkey. After training on endodontic access cavity preparation on upper ante...

Objectives: Artificial intelligence (AI) techniques like convolutional neural network (CNN) are a promising breakthrough that can help clinicians analyze medical imaging, diagnose taurodontism, and make therapeutic decisions. The purpose of the study is to develop and evaluate the function of CNN-based AI model to diagnose teeth with taurodontism...

Introduction: COVID-19 is a contagious disease caused by Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2). The nature of dentistry leads to close contact with patients and exposure to the saliva, blood and other bodily fluids during treatment processes and it is a field where high frequency devices that can make it easier for virus cont...

Background and aim: The aim of this study was to evaluate radiographically the prevalence of mandibular nutrient canals (NCs) in patients with/without periodontal bone loss with aging and to correlate the number of NCs with the severity of bone loss using cone-beam-computed tomography (CBCT). Patients and methods: CBCT examinations of 208 patien...

Background/Aim: The aim of this study was to evaluate beam hardening artifacts generated by Grade 4 and Grade 5 dental implants on computed tomography (CT) images at low and high kilovoltage peaks (kVp). Material and Methods: A total of 16 implants, 8 of which were Grade 4 and 8 were Grade 5, were inserted into bovine ribs. CT images of bovine ribs...

Introduction: Increasing use of cone-beam computed tomography (CBCT) has improved the likelihood for all physicians, including dentists, to detect incidental findings (IFs) on scans. Objectives: This study aimed to evaluate the incidence and clinical significance of incidental calcifications in the head and neck region as well as vital calcificatio...

PurposeAccessory sphenoidal septum (ASS) is a septal variation that exists in addition to the primary septum of the sphenoid sinus and can be found in or near anatomically essential structures. This study aimed to investigate the relationships between protrusions of vital structures around the sphenoid sinus and the ASSs.Methods This cross-sectiona...

Artificial intelligence is a term that enables human beings to fulfill their duties with the help of machines and technology, that is, the part of computer science that is interested in designing an intelligent computer system, which exhibits human characteristics in many subjects that we associate with intelligence, such as understanding language,...

While a large number of archived digital images make it easy for radiology to provide data for Artificial Intelligence (AI) evaluation; AI algorithms are more and more applied in detecting diseases. The aim of the study is to perform a diagnostic evaluation on periapical radiographs with an AI model based on Convoluted Neural Networks (CNNs). The d...

Background: Genetic and environmental factors especially climatic conditions are thought to influence the shape and size of the paranasal sinuses and anatomic variations may create both a diagnostic and therapeutic challenge. However, no study has been published about the climatic adaptation of the paranasal sinus region in different populations....

Yapay zeka (YZ), insanların bilişsel işlevlerini taklit eden makinelerin öğrenme ve problem çözme kapasitesini temsil eder. Tek bir klinisyenin aksine, YZ sistemleri sınırsız sayıda veriyi eşzamanlı olarak gözlemleyebilir ve hızlı bir şekilde işleyebilir. Makine öğrenimi, beyindeki biyolojik sinir ağlarının mimarisini taklit eden yapay sinir ağları...

In the present study, we aimed to assess frontal ethmoidal cells by using segmentation 3D software to establish a possible correlation between volume variation and both gender and age, as well as a relationship with Keros classification. Helical computed tomography images were obtained from 71 patients for analysis, in which the agger nasi cell, su...

The differentiation between ameloblastoma (AB) and odontogenic keratocyst (OKC) is essential for the formulation of the surgical plan, especially considering the biological behavior of these two pathological entities. Therefore, developing means to increase the accuracy of the diagnostic process is extremely important for a safe treatment. The aim...

Introduction This study aimed to investigate sleep and awake bruxism habit experienced by people who quarantined different places during the COVID-19 pandemic in the TRNC. Material and Methods A 25-question self-reported questionnaire was sent to the patients' mobile phones to measure their demographic information, the level of bruxism habits whic...

Purpose This study aims to compare the effect of light exposure in red, green and blue (RGB) colors prior to scanning of the PSP plates. Materials & Methods An Arduino-based system is produced for standardized light exposure to the irradiated PSP plates. The system consisted of an Arduino Mega 2560 developer board, 2 RGB LED light sources, a TSL259...

The objective of this study was to assess Rosenmüller fossa (RF) anatomy and neighboring structures using cone beam computed tomography (CBCT). A total of 1000 patients were analyzed using CBCT. The reference points were based on the spina nasalis posterior (Snp) and basion. The length between RF and neighboring structures were measured.The mean di...

COVID-19 is a pandemic that threatens public health worldwide. Dentists working at great risk play an essential role in protecting public health against coronavirus. This study aimed to evaluate the dental patients' attitudes and behaviors towards and knowledge and fear of COVID-19. We conducted a self-report questionnaire-based survey from 10.26.2...

Purpose: The purpose of this in vitro study was to compare the fracture resistance and survival of various esthetic crowns for primary molars after artificial aging via chewing simulation. Methods: A typodont tooth (mandibular primary second molar) was prepared to receive five different types of crowns as follows (n equals 10): prefabricated fiberg...

Objectives The aim of this study is to perform tooth numbering using deep learning algorithms on digital dental photographs, and to evaluate the success of these algorithms in determining the presence of frenulum, gingival hyperplasia and gingival inflammation which play an important role in periodontal treatment planning. Materials and Methods Si...

ÖZET Amaç: Bu çalışmada, Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK) tarafından oluşturulan ve “Üniversitelerin Alan Bazlı Yetkinlik Analizi” çalışması esas alınarak, Ankara Üniversitesi Diş Hekimliği Fakültesi için anabilim dalı ve öğretim üyesi yetkinlik analizlerinin yapılması amaçlanmıştır. Yöntem: Çalışma kapsamında, yayın, atıf...

Aim: Deep learning algorithms have lately been used for medical image processing, and they have showed promise in a range of applications. The purpose of this study was to develop and test computer-based diagnostic tools for evaluating masseter muscle segmentation on ultrasonography images. Materials and methods: A total of 388 anonymous adult m...

Objective: The purpose of the study is to create artificial intelligence (AI) system in detecting idiopathic osteosclerosis (IO) on panoramic radiographs for automatic, routine, and simple evaluations. Subject and methods: In this study, a deep learning method was carried out with panoramic radiographs obtained from healthy patients. A total of...

The aim of the present study was to evaluate the inhibitory effects of oxytocin on the development of periodontitis based on its properties against bone loss and resorption. Thirty-two Wistar albino rats were divided into four equal groups: control , periodontitis + saline, periodontitis + 0.5 mg/kg/day oxytocin, and periodontitis + 1 mg/kg/day oxy...

The present study aims to validate the diagnostic performance and evaluate the reliability of an artificial intelligence system based on the convolutional neural network method for the morphological classification of sella turcica in CBCT (cone-beam computed tomography) images. In this retrospective study, sella segmentation and classification mode...

Objectives The purpose of the study was to propose an automatic idiopathic osteosclerosis (IO) detection model based on the convolutional neural network (CNN) algorithms in panoramic radiographs using GoogleNet Inception V2 architecture and assess the performance of the artificial intelligence (AI) model compared to the human observer. Study Desig...

Objectives: This study aimed to define the prevalence and characteristics of skull base anomalies and the features of sphenoid sinus pneumatization (SSP). Materials and Methods: Five hundred cone-beam computed tomography scans were evaluated retrospectively for the presence of fossa navicularis magna (FNM), canalis basilaris medianus (CBM), sphenoi...