Evaluation of volumetric measurements on CBCT images using stafne bone cavities as an example

Background: The aim of the present study is to evaluate the efficacy of CBCT in volume measuring using Stafne Bone Cavities (SBC) as an example. Material and Methods: The study was conducted with 14 subjects with SBC detected on panoramic radiographs. In order to evaluate lesions volumetric dimensions, CBCT images for each patient were captured. Files in Digital Imaging and Communications in Medicine (DICOM) format were transferred into a medical image processing program (ITK-SNAP 2.4.0) and volume in mm 3 of the cavities were measured using semi-automatic segmentation procedure by 2 observers blinded to each other over a one-month period. Inter-reliability of volumetric measurements between observers was compared. SBCs relation to mandibular canal was also examined and three types of relation were observed; type 1: mandibular canal is separated from the SBC, type 2: mandibular canal is in contact with SBC, type 3: mandibular canal goes through the SBC. Results: There were 12 males and 2 females who had SBC in this study (age range: 37-73, mean age: 55.3 years). The total volume of SBC in patients ranged from 160 mm 3 to 520 mm 3 (mean: 361.7 mm 3 ). There was no significant difference between observers for volume measurements ( p >0.05). According to relationship of SBC with mandibular canal, most SBCs were Type 1 (64.3 %) followed by type 3 (21.4 %) and type 2 (14.3 %). Pearson correlation coefficient shows a positive correlation between lesions volumetric size and relation with mandibular canal (pearson correlation = 0.54, sig < 0.05). Conclusions: Based on the results of this preliminary study, CBCT was considered to be an effective radiographic technic for measuring volumetric sizes of SBCs. However further studies with larger sample sizes are needed to prove the usefulness of CBCT in volume measurement

Prevalence of ponticulus posticus among patients with different dental malocclusions by digital lateral cephalogram: a comparative study

Adisen, Mehmet Zahit/0000-0002-5493-8390WOS: 000397584300008PubMed: 27515304The aim of the present study was to investigate the prevalence of ponticulus posticus among patients with dental Angle class I, II, and III malocclusions in Middle Anatolian population. A total of 1246 cephalometric radiographs were examined in a 6 months period. Each patient was assigned an identification number, and demographic information, absence/presence of PP, if present, type of PP and type of dental malocclusion were recorded by two observers. In cases where there was any disagreement, a third observer was consulted. Distributions of obtained values were analysed using Pearson's Chi-square test. The mean age of subjects was 20.98 +/- 6.95 years (range 10-39). In the analysed sample, PP had a prevalence of 18.8 % (complete form 9.6 %, incomplete form 9.2 %). There was a significant difference between genders (p = 0.002) (more prevalent in male patients: 119/522; 23 %). No significant difference was found between age groups (p > 0.05). PP was most frequently detected in Angle class III patients (78/351; 22.2 %) but there was no significant difference between malocclusion groups (p > 0.05). In the present study, PP is found to be a relatively common anomaly in patients with dental malocclusions. Although Angle class III patients showed a higher frequency of PP, statistically no significant difference was found among dental malocclusion groups

The evaluation of the relationship between cervical vertebral anomalies with skeletal malocclusion types and upper airway dimensions

Adisen, Mehmet Zahit/0000-0002-5493-8390WOS: 000527866200004PubMed: 30063196Objectives: To compare the prevalence of cervical vertebral anomalies (CVAs) in different skeletal malocclusions and to evaluate the relationship between upper airway dimension and vertebral anomalies. Methods: A retrospective study was performed on lateral cephalometric radiographs of 2062 patients aged 7-49 years. Skeletal malocclusion type, presence of CVAs, and upper airway area of 1856 patients who met the inclusion criteria of the study were recorded. The obtained data were transferred to the SPSS program for statistical analysis. Results: The mean age of the patients was 13.8 +/- 3.7 years. The prevalence of CVAs was 45.7%. There was no significant difference in prevalence between skeletal malocclusions (p = 0.89). According to airway measurements, no significant difference was found between patients with and without CVAs (p = 0.718). Conclusion: The present results suggest that there is no direct effect of skeletal malocclusion type and upper airway dimension in the etiology of CVAs

Radiographic Diagnosis of Osteochondritis Dissecans of the Temporomandibular Joint: Two Cases

Yilmaz, Selmi/0000-0001-9546-6548; Yilmaz, Selmi/0000-0001-9546-6548; Adisen, Mehmet Zahit/0000-0002-5493-8390WOS: 000345094900016PubMed: 25012532Objective: To present two cases of osteochondritis dissecans (OCD) in temporomandibular joints (TMJs) evaluated by panoramic radiography and cone-beam computed tomography (CBCT). Clinical Presentation and Intervention: Two patients were referred to the Oral and Maxillofacial Radiology Clinic with pain, preauricular tenderness on the TMJ region and limitation of mandibular movements. An earlier panoramic radiograph revealed radiopaque lesions adjacent to the condyles. CBCT images were obtained from patients to assess the radiopacities. The CBCT scan detected irregular-type radiopaque lesions on anterior and superior aspects of the right condyle as well as degenerative osseous changes on both TMJs. Conclusion: The CBCT images revealed degenerative osseous changes and loose bodies on TMJs. The lesions were diagnosed as OCD with the help of trauma history, as well as clinical and radiographic findings. (C) 2014 S. Karger AG, Base

Temporomandibular Joint Involvement in Psoriatic Arthritis

Adisen, Mehmet Zahit/0000-0002-5493-8390WOS: 000422772500020PubMed: 29303139Psoriasis is a chronic, papulosquamous, and an inflammatory skin disease. It has been found that between 5% and 24% of patients develop psoriatic arthritis (PA) at the same time after or even prior to skin findings. The involvement of temporomandibular joint (TMJ) is a rare condition. In this report, a-46-year-old male patient was referred to our clinic with the complaint of pain in the bilateral TMJs, and a limited jaw movement. Medical anamnesis revealed he had psoriasis for the last 21 years, and developed a seronegative polyarthritis with destructive changes for 8 years. On extra-oral examination, crepitation at TMJs and limitation of jaw movements was detected. The radiographic examination with cone-beam CT revealed the bilaterally decreased joint spaces, erosion, and the loss of cortical edge of the joint on the condylar heads. The definitive diagnosis of PA was made with the help of patient's history and radiological findings. The uses of non-steroidal anti-inflammatory drugs and occlusal splint have been suggested for conservative treatment

Correlation of upper airway radiographic measurements with risk status for obstructive sleep apnea syndrome in young dental patients

Adisen, Mehmet Zahit/0000-0002-5493-8390WOS: 000389540500020PubMed: 27938943Objective. The aim of the present study is to compare radiographic measurements of the upper airway (UA) in young adult patients with different levels of risk status for obstructive sleep apnea syndrome. Study Design. The study included 50 patients between 18 and 30 years of age who were referred for dental examination and evaluation of impacted third molars. Case record forms, including habit history, along with the Berlin Questionnaire and the Epworth Sleepiness Scale, were completed by the patients and their relatives. According to the answers, 25 low-risk patients and 25 high-risk patients were selected. Cephalometric radiographs and cone beam computed radiography images were obtained for radiographic analysis when the patients were admitted into the study. Results. There were significant differences in body mass index, neck circumference measurements, Epworth score, and smoking status between risk groups. There were significant differences for UA measurements on radiographic evaluation. Body mass index (BMI) was found to be correlated positively with neck circumference and Epworth scores and negatively with UA measurements for all patients. Velopharyngeal measurements showed the highest correlation with Epworth scores, BMI, and neck circumference. Conclusions. The radiographic findings correlated with the survey results. Our data suggest that radiographic measurements of UA may be used as a predictor of risk for obstructive sleep apnea syndrome in a young population

Age estimation by measuring maxillary canine pulp/tooth volume ratio on cone beam CT images with two different voxel sizes

Adisen, Mehmet Zahit/0000-0002-5493-8390WOS: 000505144300010The aim of this study is to estimate age by measuring maxillary canine pulp/tooth volume ratio using CBCT images with a voxel resolution of 0.2 mm and 0.4 mm. This study was performed on CBCT images of 131 individuals between 17 and 75 years of age with fully erupted maxillary canine teeth. DICOM data were transferred to 3D-Doctor software, and pulp and tooth surfaces at each 0.2 mm or 0.4 mm axial section were manually drawn. Measurements in CBCT panoramic sections were also performed using Kvaal's method. Pearson's correlation coefficient was used to determine the relationship between pulp/tooth measurements and age. Results show that all measurements, except pulp/tooth length volume (R), are associated with age and that pulp/tooth volume (PV/TV) has the highest correlation with age (r = -0.486). Explanatory coefficient (R-2) of the regression model based on PV/TV is 0.236. There is no statistically significant difference between estimated and chronological ages across different gender and voxel groups (p>0.05). Regression models based on different voxel sizes are statistically significant for age estimation for both voxel groups. The present results should be tested on a wider patient population with evenly distributed samples to determine optimum voxel resolution for age estimation

Does sleep bruxism affect masticatory muscles volume and occlusal force distribution in young subjects? A preliminary study

Yilmaz, Selmi/0000-0001-9546-6548; Adisen, Mehmet Zahit/0000-0002-5493-8390; Yilmaz, Selmi/0000-0001-9546-6548WOS: 000478902400003PubMed: 29558863Objective To compare the differences in masticatory muscle volume and occlusal force distribution between patients with sleep bruxism (SB) and healthy individuals. Methods The study was performed on 14 SB patients and 12 controls aged between 20 and 27 years. Magnetic resonance images from a previous clinical trial were used for volumetric measurements of masticatory muscles. Distribution of bite forces was recorded using T-Scan (R) II. T-tests were used for data comparison. Results The mean age of the subjects was 23 +/- 1.85 years. The mean muscle volumes of patients with SB and healthy subjects were 177.3 and 185.9 cm(3), respectively. The mean occlusal force areas were 72.4 pixels and 89.8 pixels for patients with SB and healthy subjects, respectively. There was no significant difference in measurements between groups (p > 0.05). Conclusion There was no significant difference in the distribution of masticatory muscles and occlusal force between young patients with SB and healthy subjects.Scientific Research Projects Coordination Unit of Kirikkale UniversityKirikkale University [2015/33]This work was supported by the Scientific Research Projects Coordination Unit of Kirikkale University [Project Number 2015/33]

Assessment of Third Molar Impaction Pattern and Associated Clinical Symptoms in a Central Anatolian Turkish Population

Yilmaz, Selmi/0000-0001-9546-6548; Adisen, Mehmet Zahit/0000-0002-5493-8390; Yilmaz, Selmi/0000-0001-9546-6548WOS: 000370081000012PubMed: 26566129Objectives: The purpose of this study was to assess the pattern of third molar impaction and associated symptoms in a Central Anatolian Turkish population. Material and Methods: A total of 2,133 impacted third molar teeth of 705 panoramic radiographs were reviewed. The positions of impacted third molar teeth on the panoramic radiographs were documented according to the classifications of Pell and Gregory and of Winter. The presence of related symptoms including pain, pericoronitis, lymphadenopathy and trismus was noted for every patient. Distributions of obtained values were compared using the Pearson. 2 test. Nonparametric values were analyzed using the Mann-Whitney U test and Kruskal-Wallis test. Results: The mean age of the subjects was 30.58 +/- 11.98 years (range: 19-73); in a review of the 2,133 impacted third molar teeth, the most common angulation of impaction in both maxillaries was vertical (1,177; 55%). Level B impaction was the most common in the maxilla (425/1,037; 39%), while level C impaction was the most common in the mandible (635/1,096; 61%). Pain (272/705; 39%) and pericoronitis (188/705; 27%) were found to be the most common complications of impaction. Among 705 patients (335 males, 370 females), pericoronitis was more prevalent in males (101; 30%) and usually related to lower third molars (236; 22%). The retromolar space was significantly smaller in females (p < 0.05). Moreover, there was a significant difference in retromolar space for the area of jaw (maxillary: 11.3 mm; mandibular: 14.2 mm) and impaction level (A: 14.7 mm; B: 11.1 mm; C: 10.3 mm; p < 0.05). Conclusion: The pattern of third molar impaction in a Central Anatolian Turkish population was characterized by a high prevalence rate of level C impaction with vertical position. Pain and pericoronitis were the most common symptoms usually associated with level A impaction and vertical position. (C) 2015 S. Karger AG, Base