Comparison of micro-computerized tomography and cone-beam computerized tomography in the detection of accessory canals in primary molars

Buket Acar,Kıvanc Kamburoglu,İlkan Tatar,Volkan Arıkan,Hakan Hamdi Çelik,Selcen Yüksel,Tuncer Özen 대한영상치의학회 2015 Imaging Science in Dentistry Vol.45 No.4

Purpose: This study was performed to compare the accuracy of micro-computed tomography (CT) and cone-beam computed tomography (CBCT) in detecting accessory canals in primary molars. Materials and Methods: Forty-one extracted human primary first and second molars were embedded in wax blocks and scanned using micro-CT and CBCT. After the images were taken, the samples were processed using a clearing technique and examined under a stereomicroscope in order to establish the gold standard for this study. The specimens were classified into three groups: maxillary molars, mandibular molars with three canals, and mandibular molars with four canals. Differences between the gold standard and the observations made using the imaging methods were calculated using Spearman’s rho correlation coefficient test. Results: The presence of accessory canals in micro-CT images of maxillary and mandibular root canals showed a statistically significant correlation with the stereomicroscopic images used as a gold standard. No statistically significant correlation was found between the CBCT findings and the stereomicroscopic images. Conclusion: Although micro-CT is not suitable for clinical use, it provides more detailed information about minor anatomical structures. However, CBCT is convenient for clinical use but may not be capable of adequately analyzing the internal anatomy of primary teeth.

The bimodal regulation of vascular function by superoxide anion: role of endothelium

( Buket Demirci ),( Pascal P. McKeown ),( Ulvi Bayraktutan DVM ) 생화학분자생물학회 2008 BMB Reports Vol.41 No.3

Characterization and Wrinkle Resistance Enhancement by Sol-Gel Method of Variously Pretreated Linen Fabrics

Buket Arik 한국섬유공학회 2020 Fibers and polymers Vol.21 No.1

In this study, wrinkle resistant finish by sol-gel method was applied to the linen fabrics that were pretreated bythree different ways as bleaching/causticization, bleaching/mercerization and only bleaching. The effects of these studiedmethods on linen fabrics were investigated by physical performance tests and characterization analyses, namely, FTIR-ATR,SEM and EDX. From the results of the study it can be said that sol-gel method was favorable in enhancement of wrinkleresistance of linen fabrics and mercerization as a pretreatment process provided more positive effects in terms of wrinkleresistance than the other pretreatment processes. Moreover, it was also observed that wrinkle resistant finish by sol-gelmethod did not lead to considerable changes in physical properties like strength and handle and in appearance properties likecolor. Characterization analyses confirmed the changes in chemical structure of the linen. In addition, sol-gel method wasalso indicated as ecological and advantageous due to non-formaldehyde release of chemical agents contrary to conventionalwrinkle-resistant finishing agents.

Florid osseous dysplasia in a middle-aged Turkish woman: A case report

Buket Önder,Şebnem Kurşun,Bengi Öztaş,Emre Barış,Erdal Erdem 대한영상치의학회 2013 Imaging Science in Dentistry Vol.43 No.3

Florid osseous dysplasia (FOD) is an uncommon, benign, cemento-osseous lesion of the jaws. The etiology of FOD is still unknown. It is often asymptomatic and may be identified on routine dental radiographs. The classic radiographic appearance of FOD is amorphous, lobulated, mixed radiolucent/radiopaque masses of cotton-wool appearance with a sclerotic border in the jaws. In our case the lesion was found incidentally on routine periapical radiographs taken for restored teeth and edentulous areas. For further and detailed examination, a panoramic radiograph and cone-beam computed tomograph (CBCT) were taken. The panoramic radiograph and CBCT revealed maxillary bilateral and symmetrical, non-expansile, well-defined, round, radiopaque masses in contact with the root of the maxillary right second molar and left first molar teeth. Our aim in presenting this case report was to highlight the importance of imaging in diagnosis of FOD.

Channel current analysis of GaN HEMTs with source sense pin in DC/DC boost converters

Azizoglu, Buket Turan,Balikci, Abdul,Akpinar, Eyup,Durbaba, Enes The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.4

The breakdown strength and electron mobility of gallium nitride (GaN) are almost ten and three times higher than those of the silicon devices. Wide band-gap devices have a higher thermal conductivity, higher switching frequency capability, lower on-state resistance and lower power dissipation. Detailed analytical models in the electrical network and channel current variations of these devices during switching intervals are still under investigation. The energy loss and heat dissipation on a power converter can be precisely estimated if the operational modes and the corresponding mathematical models of the device are accurately obtained. Depending on the instantaneous values of the channel current and voltage drops on the components computed from the model, the power dissipation and thermal response can be examined. Prediction of the switching losses of a GaN high electron mobility transistor (HEMT) with a source sense pin can be performed using the instantaneous variation of channel current. In this paper, a detailed analytical model including the stray inductances and parasitic capacitors is derived to obtain the channel current of GaN HEMTs with a source sense pin. The turn-on and turn-off transient energy losses during the switching of a single GaN HEMT device can be computed from the analytical model proposed in this paper using the channel current and drain-source voltage. Results of the derived analytical model, SPICE simulations and experimental work on the DC/DC boost converter are compared.

Comparison of micro-computerized tomography and cone-beam computerized tomography in the detection of accessory canals in primary molars

Acar, Buket,Kamburoglu, Kivanc,Tatar, Ilkan,Arikan, Volkan,Celik, Hakan Hamdi,Yuksel, Selcen,Ozen, Tuncer Korean Academy of Oral and Maxillofacial Radiology 2015 Imaging Science in Dentistry Vol.45 No.4

Purpose: This study was performed to compare the accuracy of micro-computed tomography (CT) and cone-beam computed tomography (CBCT) in detecting accessory canals in primary molars. Materials and Methods: Forty-one extracted human primary first and second molars were embedded in wax blocks and scanned using micro-CT and CBCT. After the images were taken, the samples were processed using a clearing technique and examined under a stereomicroscope in order to establish the gold standard for this study. The specimens were classified into three groups: maxillary molars, mandibular molars with three canals, and mandibular molars with four canals. Differences between the gold standard and the observations made using the imaging methods were calculated using Spearman's rho correlation coefficient test. Results: The presence of accessory canals in micro-CT images of maxillary and mandibular root canals showed a statistically significant correlation with the stereomicroscopic images used as a gold standard. No statistically significant correlation was found between the CBCT findings and the stereomicroscopic images. Conclusion: Although micro-CT is not suitable for clinical use, it provides more detailed information about minor anatomical structures. However, CBCT is convenient for clinical use but may not be capable of adequately analyzing the internal anatomy of primary teeth.

Florid osseous dysplasia in a middle-aged Turkish woman: A case report

Onder, Buket,Kursun, Sebnem,Oztas, Bengi,Baris, Emre,Erdem, Erdal Korean Academy of Oral and Maxillofacial Radiology 2013 Imaging Science in Dentistry Vol.43 No.3

Florid osseous dysplasia (FOD) is an uncommon, benign, cemento-osseous lesion of the jaws. The etiology of FOD is still unknown. It is often asymptomatic and may be identified on routine dental radiographs. The classic radiographic appearance of FOD is amorphous, lobulated, mixed radiolucent/radiopaque masses of cotton-wool appearance with a sclerotic border in the jaws. In our case the lesion was found incidentally on routine periapical radiographs taken for restored teeth and edentulous areas. For further and detailed examination, a panoramic radiograph and cone-beam computed tomograph (CBCT) were taken. The panoramic radiograph and CBCT revealed maxillary bilateral and symmetrical, non-expansile, well-defined, round, radiopaque masses in contact with the root of the maxillary right second molar and left first molar teeth. Our aim in presenting this case report was to highlight the importance of imaging in diagnosis of FOD.

Cytotoxicity of temporary cements on bovine dental pulp-derived cells (bDPCs) using realtime cell analysis

serife Buket Bozkurt,Abdulkadir sengun,Sema Sezgin Hakki,Necla Demİr,Meral Arslan Malkoc 대한치과보철학회 2015 The Journal of Advanced Prosthodontics Vol.7 No.1

PURPOSE To evaluate the cytotoxicity of temporary luting cements on bovine dental pulp-derived cells (bDPCs). MATERIALS AND METHODS Four different temporary cements were tested: Rely X Temp E (3M ESPE), Ultratemp (Ultradent), GC Fuji Temp (GC), and Rely X Temp NE (3M ESPE). The materials were prepared as discs and incubated in Dulbecco's modified eagle's culture medium (DMEM) for 72 hours according to ISO 10993-5. A real-time cell analyzer was used to determine cell vitality. After seeding 200 µL of the cell suspensions into the wells of a 96-well plate, the bDPCs were cured with bioactive components released by the test materials and observed every 15 minutes for 98 hours. One-way ANOVA and Tukey-Kramer tests were used to analyze the results of the proliferation experiments. RESULTS All tested temporary cements showed significant decreases in the bDPCs index. Rely X Temp E, GC Fuji Temp, and Rely X Temp NE were severely toxic at both time points (24 and 72 hours) (P<.001). When the cells were exposed to media by Ultratemp, the cell viability was similar to that of the control at 24 hours (P>.05); however, the cell viability was significantly reduced at 72 hours (P<.001). Light and scanning electron microscopy examination confirmed these results. CONCLUSION The cytotoxic effects of temporary cements on pulpal tissue should be evaluated when choosing cement for luting provisional restorations.

Antimicrobial Activity and Chemical Composition of Some Essential Oils

Arldogan, Buket-Cicioglu,Baydar, Hasan,Kaya, Selcuk,Demirci, Mustafa,Ozbasar, Demir,Mumcu, Ethem The Pharmaceutical Society of Korea 2002 Archives of Pharmacal Research Vol.25 No.6

In this study the composition and antimicrobial properties of essential oils obtained from Origanum onites, Mentha piperita, Juniperus exalsa, Chrysanthemum indicum, Lavandula hybrida, Rosa damascena, Echinophora tenuifolia, Foeniculum vulgare were examined. To evaluate the in vitro antibacterial activities of these eight aromatic extracts; their in vitro antimicrobial activities were determined by disk diffusion testing, according to the NCCLS criteria. Escherichia coli (ATTC 25922), Staphylococcus aureus (ATCC 25923) and Pseudomonas aeruginosa (ATTC 27853 were used as standard test bacterial strains. Origanum onites recorded antimicrobial activity against all test bacteria, and was strongest against Staphylococcus aureus. For Rosa damascena, Mentha piperita and Lavandula hybrida antimicrobial activity was recorded only to Staphylococcus aureus. Juniperus exalsa, and Chrysanthemum indicum exhibited antibacterial activities against both Staphylococcus aureus and Escherichia coli. We also examined the in vitro artimicrobial activities of some components of the essential oils and found some components with antimicrobial activity.

The effect of curvature on the impact response of foam-based sandwich composite panels

Melis Yurddaskal,Buket Okutan Baba 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.20 No.5

The aim of this study is to investigate the impact behavior and impact-induced damage of sandwich composites made of E-glass/epoxy face sheets and PVC foam. The studies were carried out on square flat and curved sandwich panels with two different radius of curvatures. Impact tests were performed under impact energies of 10 J, 25 J and 80 J using an instrumented drop-weight machine. Contact force and displacement versus time and contact force- displacement graphs of sandwich panels were presented to determine the panel response. Through these graphs, the energy absorbing capacity of the sandwich panels was determined. The impact responses and failure modes of flat and curved sandwich panels were compared and the effect of curvature on sandwich composite panel was demonstrated. Testing has shown that the maximum contact force decrease while displacement increases with increasing of panel curvature and curved panels exhibits mixed failure mode, with cylindrical and cone cracking.