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Öğe Comparison of CBCT radiation doses with conventional radiographs in TMJ imaging using Monte Carlo simulations(Springer Science and Business Media Deutschland GmbH, 2024) Deniz, Yeşim; Eren, Hakan; Sessiz, Rüya; Coşan Ata, GamzeThree-dimensional imaging methods are widely used for evaluation of bony changes of temporomandibular joint (TMJ). Besides, lateral and posterio-anterior TMJ projections in both closed- and open-jaw positions for each temporomandibular joint are used as two-dimensional diagnostic tools. The purpose of the present study was to compare effective and mean organ absorbed doses of plain radiography techniques with those of different modalities of cone beam computed tomography (CBCT) scanning of an adult’s temporomandibular joint. PCXMC 2.0 software was used to calculate mean organ and effective doses. A NewTom CBCT device (Newtom 5G XL; QR systems; Verona, Italy) was simulated at 360° rotation using a 6 × 6 cm2 FOV in standard and high-resolution modes. Lateral and posterio-anterior TMJ plain projections were simulated according to recommendations of the manufacturer of the Planmeca ProMax® 2D S3 device. Doses for both projections were simulated with Monte Carlo methods and the International Commission on radiological protection adult reference computational phantoms. The highest mean organ absorbed doses occurred in bone surfaces, salivary glands, and skull for posterio-anterior TMJ and lateral TMJ, and for CBCT scanning in all examinations. The effective doses of posterio-anterior and lateral TMJ plain radiographs were found to be higher than those of the Standard Mode-Eco Scan CBCT. Therefore, the lowest effective dose was calculated in Standard Mode-Eco Scan CBCT. It is concluded that NewTom 5G XL Standard Mode-Eco Scan CBCT can be used instead of plain radiographs (lateral and posterio-anterior TMJ) in temporomandibular joint imaging as it allows visualizing the three-dimensional structure of the temporomandibular joint as an advantage.Öğe Comparison of Dental and Skeletal Age Estimating Methods in Children(University of Zagreb, 2023) Çelik Güler, Özge; Deniz, Yeşim; Arslan, SemihaObjectives: Estimating age is a crucial determinant of forensic science. Various methods have been used to estimate dental age (DA) and skeletal age (SA).The aim of the current study was to compare the Cameriere's DA method with the Cameriere's SA method in estimating CA in children. Materials and methods: A total of 216 radiographs of 130 females and 86 males (between 9 to 14.99 years of age) were evaluated in northwestern Turkey. DA was calculated on the panoramic images using Cam-eriere's open-apex method. SA was determined on the lateral cephalograms using the fourth cervi-cal vertebrae method by Cameriere. The DA, SA, and CA data were compared using a paired t-test and Wilcoxon test. Results: The mean CA of all groups was calculated as 12.96 +/- 0.30, the mean DA of 12.74 +/- 0.68 and the mean SA of 12.89 +/- 0.89. In males, the DA method presented an underestima-tion between ages of 14.00 and 14.99 (p<0.05) and an overestimation between ages 9.00 and 11.99 (p<0.05). In females, the DA method showed an underestimation in the 13.00-and 14.99-year-old age groups (p<0.05) and an overestimation in the 10.00-and 11.99-year-old age groups (p<0.05). The SA method revealed a significant underestimation in females between the ages of 13.00 and 14.99 and in males between the ages of 14.00 and 14.99 (p<0.05). Conclusions: The SA estimation method may provide more accurate results compared to the DA method with children of both sexes aged between 9.00 to 12.99 in the determination of CA.Öğe Effects of direct therapeutic radiation on pulpal surface of root dentin: an in vitro study(Springer Science and Business Media Deutschland GmbH, 2023) Deniz, Yeşim; Işıktaş Acar, Ezgi; Çetin Genç, ÇiğdemThe aims of the study were to analyze the effects of therapeutic radiation on human root dentin samples from the aspect of possible alterations in crystallinity, micro-morphology, and composition. Fifty-six root dentin specimens were divided into seven groups (0, 10, 20, 30, 40, 50, and 60 Gy). Scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) analyses were performed on pulpal surfaces of root dentin after being irradiated by 6MV photon energy. Mineral compositions, Ca/P, P/N, Ca/N ratios, and hydroxyapatite pikes were calculated. Some deuteriations on the dentin surface were observed in SEM images after 30 Gy and subsequent doses. One-way ANOVA revealed that there was no significant alteration in weight percentages of C, O, Mg, Ca, P, and N between groups. Radiation did not influence stoichiometric Ca/P, Ca/N, and P/N molar ratios. XRD analysis did not show a remarkable decline in hydroxyapatite pikes by the increasing doses. Radiotherapy changes the micromorphology of circumpulpal dentin but does not affect elemental composition and crystallinity.Öğe Effects of high temperature on dental restorative materials for forensic purposes(Springer, 2021) Çarıkçıoglu, Burak; Misilli, Tuğba; Deniz, Yeşim; Aktaş, ÇağatayThis study aimed to observe the efects of high temperature on diferent restorative dental materials by detecting changes in their microstructural and elemental composition. Disk shaped samples (10 mm diameter, 2 mm depth) were prepared from 8 dental materials (compomer, glass carbomer, ormocer, giomer, zinc reinforced glass ionomer (GI), silver-alloy reinforced GI, zirconia reinforced GI, and conventional GI). Scanning electron microscopy/Energy dispersive X-ray spectroscopy (SEM/EDS) was used to characterize sample surface structures and elemental composition. The same samples were also analyzed using X-ray fuorescence (XRF) to determine the trace element content. Each sample was placed in a porcelain furnace and exposed to 900 °C for 30 min. Observations of macroscopic changes in samples after exposure high temperature were recorded. The microstructural changes in sample surfaces after incineration were detected by SEM. The elemental compositions obtained before and after the incineration were compared after repeating the XRF and EDS analyses. Dental materials demonstrated specifc macroscopic changes and microstructural deteriorations detected by SEM images after exposure to high temperature. While several changes occurred in the elemental content of materials in terms of amount, the original elemental composition was preserved. The ability to distinguish dental materials by elemental analyses has had an important impact on the identifcation process.Öğe Effects of radiotherapeutic X-ray irradiation on cervical enamel(Taylor and Francis Ltd., 2021) Deniz, Yeşim; Aktaş, Çağatay; Misilli, Tuğba; Çarıkçıoğlu, BurakPurpose Therapeutic radiation used for head and neck cancers mainly affects the cervical region of the tooth. To better understand the impact of therapeutic radiation on tooth, we aimed to examine the crystallinity, micro-morphology, and elemental composition of the cervical inner enamel located adjacent to the dento-enamel junction. Materials and methods Ninety-one specimens obtained from 16 impacted third mandibular molars were randomly divided into seven groups (0, 10, 20, 30, 40, 50, and 60 Gy irradiation groups). Energy-dispersive X-ray spectroscopy (EDX) and scanning electron microscopy (SEM) were performed after the irradiation by 6 MV photon energy. The X-ray diffraction (XRD) were conducted in every group before and after irradiation. Elemental compositions, and Ca/P, P/N, Ca/N atomic ratios were subjected to the Shapiro-Wilk normality test. All of the elements except Mg showed a normal distribution and were compared by the one-way ANOVA. The non-normally distributed Mg data and Ca/P, P/N, and Ca/N ratios were compared by the Kruskal-Wallis test. Results The results showed that widening in the interprismatic spaces were observed in the experimental groups subjected to 30 Gy and the following increased doses. In addition, there were no significant differences in C, O, Ca, P, N percentages between irradiated and non-irradiated groups (p > .05). An increase in atomic ratio of the Mg was detected after samples conducted by 60 Gy radiation dose (p < .05). The stoichiometric Ca/P, Ca/N, and P/N atomic ratios did not change by irradiation (p > .05). The XRD peaks of the inner enamel crystalline phase showed a slight decline in the 60 Gy radiation dose group. Conclusion Radiation effects begin to be seen after 30 Gy radiation dose groups. The widen interprismatic spaces seen obviously in 50 Gy and 60 Gy dose groups. Besides Mg ratio showed an increase in the 60 Gy dose group. But it should be thought that radiation caries is a multi-factorial disease that is in collaboration with various radiation-induced side effects.Öğe Evaluation of the differences in the localization of the lingula mandibulae according to pubertal development in children: A new anthropological and forensic approach(Elsevier Ltd, 2024) Eren, Hakan; Sezer, Berkant; Deniz, YeşimObjective: This study aims to investigate changes in lingula mandibulae localization before and after puberty and sex differences. Design: 288 panoramic radiographs evaluated retrospectively were divided into four groups according to pubertal development: under and over 10 years old for females and under and over 11 years old for males. Four anatomic sites were used as reference points: (a) the anterior border of the ramus; (b) the posterior border of the ramus; (c) the deepest point of mandibular notch; and (d) the angulus mandibulae. The ratio of the distances from the lingula mandibulae to points (a) and (b) and the ratio of the distances from the lingula mandibulae to points (c) and (d) were determined. Two-way ANOVA was performed to assess differences between subgroups based on sex and puberty, and a Bonferroni post-hoc test was performed for multiple comparisons. Results: Puberty and sex has a significant interaction effect on the vertical location of the lingula mandibulae. Postpubertal lingula mandibulae is positioned proportionally more anteriorly by prepubertal localization. In addition, the lingula mandibulae is situated more posteriorly in females compared to males. A significant interaction effect of puberty and sex was observed in relation to the vertical positioning of the lingula mandibulae. Conclusions: The spatial localization of the lingula mandibulae and its spatial displacement with age can be used both in estimating sex and the onset of puberty. Changes in the localization of lingula mandibulae according to pubertal development and sex can be used in forensic and anthropological contexts.Öğe Is there a relationship between transverse maxillary deficiency and sella turcica: A cephalometric analysis study?(Scientific Scholar, 2021) Deniz, Yeşim; Arslan, SemihaObjectives: The aim of this study was to investigate the dimensions and morphological variations of sella turcica and to test whether a relationship exists between sella turcica and transverse maxillary deficiency. Materials and Methods: The cephalometric radiographs of patients older than 17.99 years, which have been taken before the orthodontic treatment, and patient records were analyzed to investigate sella turcica dimensional and morphological analysis. Linear measurements of sella are as follows sella length, sella width, sellar area, sella height anterior, posterior, and median. The sella turcica morphological shape analysis was performed into six groups (normal sella turcica, oblique anterior wall, sella turcica bridge, double contour of floor, irregularities of the posterior part of the dorsum sella, and pyramidal shape of the dorsum sella). The width of the maxillary arch is measured by the digital caliper. Male participants with a maxillary width of less than 30.8 mm and a maxillary width of less than 31.1 mm in female patients in the first molar region were determined as a transverse maxillary deficiency. The mean dimensions of sella turcica and the relationship between cases with transverse maxillary deficiency and non-skeletal anomaly were compared using independent samples t-tests. The transverse maxillary deficiency and the sellar morphology relationship were compared using Chi-square test. Post hoc multiple comparisons and analyzes were performed at 95% confidence interval by Bonferroni correction. Results: The sella length measurements yielded higher values among the patients with transverse maxillary deficiency (P < 0.05). The normal sella morphology had quantitative superiority in patients without skeletal anomaly in comparison with transverse maxillary deficiency cases (P < 0.05). It was observed that the sella turcica bridge had a statistically superiority in patients with transverse maxillary deficiency (P < 0.05). Conclusion: The increased sellar measurement and sella turcica bridging, may provide knowledge about possible transverse maxillary deficiency.Öğe Sella tursika köprülenmesi ile maksiller darlık arasındaki ilişkininaraştırılması(2020) Deniz, Yeşim; Arslan, SemihaAmaç: Bu çalışmanın amacı sella tursika köprülenmesi ile maksiller darlık arasındaki ilişkinin değerlendirilmesidir. Gereç ve Yöntem: Bu retrospektif çalışmada, 2017-2019 yılları arasında ortodonti kliniğinde tedavi görmekte olan 18-30 yaşları arasındaki 73 adet maksiller darlık teşhisi almış olan hasta ile 73 adet herhangi bir iskeletsel anomalisi bulunmayan hastanın sella tursika köprülenme tipleri sefalometrik radyografiler üzerinde karşılaştırıldı. Çalışmaya dahil edilen sefalometrik radyografilerin tümü sistemik açıdan sağlıklı, ortognatik cerrahi veya baş boyun bölgesinden herhangi bir travma geçirmemiş olan ortodonti hastalarına ait iyi kaliteli görüntülerdi. Sella tursika köprülenme tipleri Sınıf I (kalsifikasyon yok), Sınıf II (parsiyel kalsifikasyon) ve Sınıf III (tam kalsifikasyon) olarak sınıflandırıldı. Sella tursika köprülenme tipleri ile çalışma grubu ve kontrol grubu arasındaki ilişki ki- kare testi kullanılarak değerlendirildi. Post Hoc çoklu karşılaştırmalarda Bonferroni düzeltmesi yapılarak %95 güven aralığında analizler sürdürüldü. İstatistiksel anlamlılık düzeyi 0,05 olarak kabul edildi.Bulgular: Sınıf I (kalsifikasyon yok), sella tursika köprülenmesi kontrol grubunda çalışma grubuna göre istatiksel olarak anlamlı düzeyde fazla, Sınıf II (parsiyel kalsifikasyon) sella tursika köprülenmesinin ise çalışma grubunda kontrol grubuna göre daha fazla olduğu görüldü (p<0.05). Cinsiyetle sella tursika köprülenme tipleri arasındaki ilişki karşılaştırıldığında maksiller darlık teşhisi olan kadın hastalarda Sınıf II (parsiyel kalsifikasyon) sella tursika köprülenmesi anlamlı düzeyde fazla görüldü (p>0,05).Sonuç: Bu çalışmanın sonucunda, sella tursika köprülenmesi ile maksiller darlık arasında ilişki gözlemlenmiştir. Sella tursika köprülenmesinin olası maksiller darlık oluşumu hakkında öngörü sağlayabileceği veya hastanın yüz profili hakkında bilgi verebileceği düşünülmektedir. Bu çalışma maksiller darlık ile sella tursika köprülenmesi arasındaki ilişkinin incelendiği ilk çalışma niteliğindedir.Öğe The Role of Instagram on Dental Education(2021) Geduk, Gediz; Deniz, YeşimObjective: Technological developments affect educational processes, learning methods, and learning environments. Dentistry education should be adapted parallel with technologicaldevelopments for students whose learning habits change with the increasing using of social media and mobile phones. This study aimsto compare the efficacy of the mobile-based education method (Instagram application) and the traditional classroom education method.Material and Methods: The study was conducted with 42 volunteerstudents who had not taken general and oral pathology courses yet.Students (n:21) in the control group took radiological features of theodontogenic and non-odontogenic cysts and odontogenic tumorscourse by the classroom learning method. The study group (n:21) followed the same lessons’ images on the newly opened @beuradyolojiInstagram account. Both groups were trained for 1 hour a week for 4weeks. The knowledge test was held 15 days after the end of thecourses to all students. Paired sample t-test was performed to investigate differences between the mean knowledge test scores of thegroups. Results: The examination average for the study group was71.97±9.3 and the control group was 68.33±8.39. Paired sample t-testshowed no significant difference between the study and controlgroups in knowledge scores (p>0.05). Conclusion: The current studyis the first that investigates the effect of the mobile-based educationmethod on radiological features of the specific cysts and tumors. Thestudy carried out on a limited number of students, shows that the valueof mobile-based education has almost the same effectiveness to classroom education.Öğe Ultrasound examination of various dental materials and foreign bodies(2023) Deniz, Yeşim; Ak, Rüya Sessiz; Eren, HakanPurpose To provide information on the sonographic properties of different foreign bodies and dental materials to help with diagnosis. Materials & Methods The investigation contained 10 various dental materials and foreign bodies that were consisting of composite, glass ionomer cement, gutta percha, suture, wooden, stone, canal file, acrylic, alginate, and silicone impression material. The objects were embedded to chicken meat and imaged using ultrasonography (USG). Their visibility and posterior acoustic behaviors were evaluated by both hockey and linear transducers. The actual sizes of this objects and measured dimensions by transducers were compared. Results Only gutta percha could not be distinguished in chicken meat. No difference was observed between the measurements made with the hockey and linear transducers and the actual size. Conclusion USG is a useful method for detecting and measuring foreign bodies and dental materials in soft tissues.
