The effect of light sources and CAD/CAM monolithic blocks on degree of conversion of cement

Aydan Boztuna Çetindemir,Bülent Şermet,Değer Öngül 대한치과보철학회 2018 The Journal of Advanced Prosthodontics Vol.10 No.4

PURPOSE. To assess the degree of conversion (DC) and light irradiance delivered to light-cured and dual-cured cements by application of different light sources through various types of monolithic computer-aided design and computer-aided manufacturing (CAD/CAM) materials. MATERIALS AND METHODS. RelyX Ultimate Clicker light-cured and dual-cured resin cement specimens with 1.5-mm thicknesses (n=300, 10/group), were placed under four types of crystalline core structure (Vita Enamic, Vita Suprinity, GC Ceresmart, Degudent Prettau Anterior). The specimens were irradiated for 40 seconds with an LED Soft-Start or pulse-delay unit or 20 seconds with a QTH unit. DC ratios were determined by using Fourier transform infrared spectroscopy (FTIR) after curing the specimen at 1 day and 1 month. The data were analyzed using the Mann-Whitney U test (for paired comparison) and the Kruskal-Wallis H test (for multiple comparison), with a significance level of P<.05. RESULTS. DC values were the highest for RelyX Ultimate Clicker light-cure specimens polymerized with the LED Soft-Start unit. The combination of the Vita Suprinity disc and RelyX Ultimate Clicker dual-cure resin cement yielded significantly higher values at both timepoints with all light units (all, P<.05). CONCLUSION. Within the limitations of this study, we conclude that the DC of RelyX Ultimate Clicker dual-cure resin cement was improved significantly by the use of Vita Suprinity and the LED Soft-Start light unit. We strongly recommend the combined use of an LED light unit and dual-cure luting cement for monolithic ceramic restorations.

In situ stress inference from damage around blasted holes

O¨mer Aydan 한국자원공학회 2013 Geosystem engineering Vol.16 No.1

In situ stresses are one of the most important elements for the design and stability assessment of rock engineering structures and earthquake science. Many in situ stress inference and measurement techniques are devised, and they are broadly classified into direct or indirect techniques. Drilling and blasting technique is widely used as an excavation technique in rock engineering practice. The experiments on specimens clearly indicated that the fracture zones around the blasthole were larger in the direction of the maximum load. Some parts of the blastholes remain following blasting. In this study, a method how to infer the in situ stresses from the damage zones around the blastholes is proposed. The method is named as the blasthole-damage method. The fundamentals of this method are described and it is applied to several sites where in situ stress states are obtained by using direct or indirect techniques. The inferences are compared with measurements, and the validity of the method is discussed in view of the measurements or inferences from other methods. It is found that the method proposed can serve as a guideline to infer the stress state around rock excavations using the damage zone around blastholes as the drill/blast technique is commonly used in rock excavations.

Synthesis and Properties of Calix[4]arene Polymers Containing Amide Groups:Exploration of Their Extraction Properties Towards Dichromate and Nitrite Anions

Ezgi Akceylan,Aydan Yilmaz,Mustafa Yilmaz 한국고분자학회 2013 Macromolecular Research Vol.21 No.10

The article describes the synthesis and extraction properties of three new diamide substituted calix[4]arene based polymers (3a, 4a, and 5a). The examination of their recognition abilities towards some selected oxyanions shows that the new calix[4]arene polymers are more effective receptors than their amide derivatives for dichromate anions and nitrite. It has been observed that receptor 4a is a better extractant for dichromate and nitrite anions at low pH.

The Utility of Intraoperative Handheld Gamma Camera for Detection of Sentinel Lymph Nodes in Melanoma

Elgin Ozkan,Aydan Eroglu 대한핵의학회 2015 핵의학 분자영상 Vol.49 No.4

Accurate identification of the sentinel lymph node (SLN) is an important prognostic factor for melanoma. In a minority of cases drainage to interval nodal basins, such as the epitrochlear region, are possible. Intraoperative handheld gamma cameras have been used to detect SLNs which are located in different anatomical localizations. In this case we report the utility of an intraoperative handheld gamma camera in the localization of epitrochlear drainage of distal upper extremity melanoma and its impact on surgical procedure.

Investigation of possible causes of sinkhole incident at the Zonguldak Coal Basin, Turkey

Genis, Melih,Akcin, Hakan,Aydan, Omer,Bacak, Gurkan Techno-Press 2018 Geomechanics & engineering Vol.16 No.2

The subsidence mechanism of ground surface is a complex phenomenon when multiple seam coal mining operations are carried out. Particularly, the coal mining beneath karstic formations causes a very special form of subsidence. The subsidence causes elasto-plastic deformation of the karstic layers and the collapse of cavities leads to dolinization and/or sinkhole formation. In this study, a sinkhole with a depth of 90 m and a width of 25 m formed in Gelik district within the coal-basin of Zonguldak (NW, Turkey) induced by multiple seam coal mining operations in the past has been presented as a case-history together with two-dimensional numerical simulations and InSAR monitoring. The computational results proved that the sinkhole was formed as a result of severe yielding in the close vicinity of the faults in contact with karstic formation due to multiple seam longwall mining at different levels.

Static analysis of simply supported porous sandwich plates

Vedat Taskin,Pinar Aydan Demirhan 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.77 No.4

In this study, it is aimed to analyze the bending of porous sandwich plates using the four-variable shear deformation theory. The core of the sandwich plate is assumed to be functionally graded, and face sheets are assumed to be isotropic. The pore distribution of the sandwich plate is considered even and uneven type of porosity distribution. Displacement fields are defined with four variable shear deformation theory. Equilibrium equations of porous sandwich plates are derived from virtual displacement principle. An analytical solution is obtained by Navier’s approach. Results are presented for uniformly and sinusoidally distributed loaded porous sandwich plates. Face sheet -core thickness ratio, porosity distribution, amount of porosity is investigated.

An Early Prenatal Diagnosis of a 69, XXY Case Using Quantitative Fluorescent PCR (QF-PCR) in Uncultured Amniocytes

Mehmet Ali Ergun,Meral Yirmibes Karaoguz,Aydan Biri,Elif Pala,Mert Kuskucu 한국유전학회 2006 Genes & Genomics Vol.28 No.1

Celiac Disease: Presentation of 109 Children

Zarife Kulo lu,Ceyda Tuna KIrsaçlIo lu,Aydan Kansu,Arzu Ensari,Nurten Girgin 연세대학교의과대학 2009 Yonsei medical journal Vol.50 No.5

Purpose: The clinical features of patients with celiac disease (CD) are variable. In the present study, clinical and laboratory features of 109 patients with CD were retrospectively evaluated. Materials and Methods: In all cases, diagnosis of CD was made by European Society for Paediatric Gastroenterology, Hepatology and Nutrition (ESPGHAN) criteria and clinical and laboratory findings, including hematological and biochemical analyses, immunoglobulin levels, autoantibodies [antinucler antibody (ANA), antidouble stranded DNA (dsDNA), antimitochondrial antibody (AMA), anti-smooth muscle antibody (ASMA), liver kidney antibody (LKM-1), anti thyroid peroxidase (TPO), anti thyroglobulin (Tg)], bone mineral density (BMD), and electroencephalogram were evaluated. The type of CD was recorded. Results: Of 109 patients with CD, 66 (60.6%) were classical type, 41 (37.6%) were atypical type and 2 (1.8 %) were silent type. The mean age was 8.81 ± 4.63 years and the most common symptom was diarrhea (53.2%) followed by failure to thrive, short stature, and abdominal pain. Paleness (40.4%), underweight (34.8%), and short stature (31.2%) were the most common findings. Iron deficinecy anemia (81.6%), zinc deficiency (64.1%), prolonged prothrombin time (35.8%), and elevated transaminase levels (24.7%) were the most common laboratory findings. Eight percent of patients had at least 1 autoantibody, and 28 of 52 patients had low BMD. Four of 38 patients had abnormalty in electroencephalograms. The prevalance of selective immunoglobulin (Ig) A deficiency was 9.1%. Histocompatibility antigen HLA-DQ and/or DQ8 genotypes were found in 91% of patients. Abdominal distention, iron deficiency, prolonged prothrombine time, hypoalbuminemia, and elevated transaminase levels were more significantly frequent in the classical type than atypical type (p < 0.005). Conclusion: Although classical CD was seen in most patients in the present study, clinical variability of the condition should be kept in mind. Purpose: The clinical features of patients with celiac disease (CD) are variable. In the present study, clinical and laboratory features of 109 patients with CD were retrospectively evaluated. Materials and Methods: In all cases, diagnosis of CD was made by European Society for Paediatric Gastroenterology, Hepatology and Nutrition (ESPGHAN) criteria and clinical and laboratory findings, including hematological and biochemical analyses, immunoglobulin levels, autoantibodies [antinucler antibody (ANA), antidouble stranded DNA (dsDNA), antimitochondrial antibody (AMA), anti-smooth muscle antibody (ASMA), liver kidney antibody (LKM-1), anti thyroid peroxidase (TPO), anti thyroglobulin (Tg)], bone mineral density (BMD), and electroencephalogram were evaluated. The type of CD was recorded. Results: Of 109 patients with CD, 66 (60.6%) were classical type, 41 (37.6%) were atypical type and 2 (1.8 %) were silent type. The mean age was 8.81 ± 4.63 years and the most common symptom was diarrhea (53.2%) followed by failure to thrive, short stature, and abdominal pain. Paleness (40.4%), underweight (34.8%), and short stature (31.2%) were the most common findings. Iron deficinecy anemia (81.6%), zinc deficiency (64.1%), prolonged prothrombin time (35.8%), and elevated transaminase levels (24.7%) were the most common laboratory findings. Eight percent of patients had at least 1 autoantibody, and 28 of 52 patients had low BMD. Four of 38 patients had abnormalty in electroencephalograms. The prevalance of selective immunoglobulin (Ig) A deficiency was 9.1%. Histocompatibility antigen HLA-DQ and/or DQ8 genotypes were found in 91% of patients. Abdominal distention, iron deficiency, prolonged prothrombine time, hypoalbuminemia, and elevated transaminase levels were more significantly frequent in the classical type than atypical type (p < 0.005). Conclusion: Although classical CD was seen in most patients in the present study, clinical variability of the condition should be kept in mind.

Polycystic Ovary Syndrome and Risk of Endometrial Cancer: a Mini-Review

Tokmak, Aytekin,Kokanali, Mahmut Kuntay,Guzel, Ali Irfan,Kara, Aydan,Topcu, Hasan Onur,Cavkaytar, Sabri Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.17

The polycystic ovary syndrome is the most common endocrinological disorder of reproductive age women with a prevalence of 5 to 8 %. The most common diagnostic criteria used for polycystic ovary syndrome are oligo- or an-ovulation, clinical and/ or biochemical signs of hyperandrogenism and polycystic ovaries. Hyperandrogenism results in increased estrogen levels and lack of cyclic progesterone due to anovulation and persistent stimulation of the endometrium may lead to endometrial hyperplasia or adenocarcinoma development. In this mini review, we aimed to evaluate the possible relationship between polycystic ovary syndrome and endometrial cancer.

The Relationship between Vascular Endothelial Growth Factor -634G>C Polymorphism and Ovarian, Cervical and Endometrial Cancers

Ece Konac,H. Ilke Onen,Jale Metindir,Ebru Almayanlar,Aydan Asyali Biri,Abdullah Ekmekci 한국유전학회 2006 Genes & Genomics Vol.28 No.2