Yazar "Guven, S." seçeneğine göre listele

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    Evaluation of mental foramen location in the 10-70 years age range using cone-beam computed tomography
    (Wolters Kluwer Medknow Publications, 2017) Gungor, E.; Aglarci, O. S.; Unal, M.; Dogan, M. S.; Guven, S.
    Introduction: Mental foramen (MF) locations were determined according to gender and age in terms of the vertical distance from the surrounding anatomical structures and the vertical and horizontal size of the MF. Materials and Methods: One hundred-seven male and 103 female patients in the age group between 10 and 70 years were included in our retrospective study and were examined using cone-beam computed tomography (CBCT). The right and the left MF locations were determined from panoramic and cross-sectional images. On the cross-sectional CBCT images, the distance of the MF upper limit from the alveolar crest edge, the distance of the MF lower limit from the lower edge of the mandible, and vertical size of the MF were measured. Results: MF location differed in males and females (P < 0.001); it was generally located at the first and second premolar in females, and at the level of the second premolar in males. However, the MF location was not different on the right and left sides (P = 0.436). The distance of the MF from the surrounding anatomic structures were found to be lower in females than in males in all measurements (P < 0.001). The horizontal size of the MF was found to be less on the left side (P < 0.001). Conclusions: Knowing both the position and the distance of the MF from the surrounding anatomical structures is not only useful information for surgery, but will also help avoid complications such as paresthesia.
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    Frequency of respiratory function disorders among dental laboratory technicians working under conditions of high dust concentration
    (Verduci Publisher, 2013) Abakay, A.; Atilgan, S.; Abakay, O.; Atalay, Y.; Guven, S.; Yaman, F.; Palanci, Y.
    BACKGROUND AND OBJECTIVES: Dental laboratory technicians (DLTs) have much exposure to mineralogical dust that may have adverse effects on their lung health. The aim of our study was to investigate occupational dust exposure, and to determine the frequency of respiratory function disorders and radiologic abnormalities among DLTs. MATERIALS AND METHODS: The study enrolled 94 DLTs who were exposed to dust in dental laboratories and 94 control subjects. Dust concentrations in the workplaces were measured. RESULTS: The mean age of DLTs was 30.70 +/- 9.84 years. No significant difference was found between the DLTs and the control groups for age or smoking status (p > 0.05). Spirometric values for the DLTs were found to be lower than the control group (p < 0.05). The mean working period for DLTs was 9.19 +/- 5.9 years. The pulmonary function test results for the DLTs showed that 65.9% had a normal pattern, 22.4% were restrictive, and 11.7% showed obstructive type pulmonary function disorder. Negative correlations were found between the working period time and Forced Expiratory Volume in 1 second in the DLTs (R = -0.675 p = 0.000). Negative correlations were also found between working period time and Forced Vital Capacity in the DLTs (R = -0.720 p = 0.000). All DLTs had chest X-rays and 16 (17%) of them showed radiological pneumoconiosis. CONCLUSIONS: This study showed a negative association between level of respiratory function and working period in DLTs.
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    Measuring the resistance of different substructure materials by sticking them to dentine with two different resin cements in vitro
    (Medknow Publications & Media Pvt Ltd, 2016) Eratilla, V.; Yildiz, A. D.; Guven, S.; Eratilla, E. A.; Karaman, T.; Aguloglu, S.; Sumer, E.
    Introduction: The resistance of three different substructure materials - metal (Cr-Co), zirconium (Zr), and ceramics (IPS Empress II) - was measured by sticking them to dentine with two different resin cements, a dual-cure resin cement (Panavia F 2.0 Light) and a self-adhesive resin cement (BisCem). Materials and Methods: In an in vitro study, 72 central upper front teeth were selected with no decay or apparent breakage and with complete development, removed for periodontal reasons. Labial and incisal surfaces of all teeth were prepared. Molds were obtained to prepare metal (Co-Cr), Zr, and ceramic (IPS Empress II) blocks for use in the study. The compressive strengths of the obtained material infrastructures were examined after thermal cycle processing by performing cementation to the teeth with two different cements. The data obtained were analyzed statistically. The Mann-Whitney U-test was used for comparisons of the groups with two options, and Kruskal-Wallis variance analysis was used to compare more than two groups. P < 0.05 were considered statistically significant. Results: While the highest result between samples was 117.86 +/- 47.94 N in the dual-cure (Panavia) -ceramic group, the lowest value was observed at 6.53 +/- 3.12 N in the self-adhesive (BisCem) -metal group. There was a significant difference between dual-cure (Panavia) and self-adhesive (BisCem) groups. Conclusion: In this study, we measured the bond strength; our most durable resistance groups were found to be, in order, Panavia-ceramics >Panavia-metal >Panavia-Zr >self-adhesive-ceramics >self-adhesive-Zr >and self-adhesive-metal.
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    The role of homocysteine, asymmetric dimethylarginine and nitric oxide in pre-eclampsia
    (Taylor & Francis Inc, 2012) Demir, B.; Demir, S.; Pasa, S.; Guven, S.; Atamer, Y.; Atamer, A.; Kocyigit, Y.
    Nitric oxide (NO) contributes to vasodilatation that is observed during normal pregnancy. Hyperhomocysteinaemia (HHcy) is a vascular risk factor associated with placental microvascular diseases and pre-eclampsia. Asymmetric dimethylarginine (ADMA), an endogenous inhibitor of endothelial nitric oxide synthase (NOS) has been linked to endothelial dysfunction. Maternal ADMA has been reported to be higher in women with pre-eclampsia and HHcy leads to accumulation of ADMA. The aim of this presented study is to evaluate the alterations of plasma homocysteine, ADMA and NO levels in mild pre-eclampsia. A total of 40 pre-eclamptic women and 40 healthy controls were included into the study. Mean systolic and diastolic blood pressure, mean serum homocysteine and ADMA levels were significantly higher and NO level was lower in patients. Serum homocysteine, ADMA and NO levels found to be correlated among them and with blood pressure. In conclusion, we found that homocysteine and ADMA levels were increased and NO levels decreased in pre-eclampsia.
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    Serum levels of androgens and prostate-specific antigen in endometriosis
    (I R O G Canada, Inc, 2014) Evsen, M. S.; Sak, M. E.; Soydinc, H. E.; Guven, S.; Basaranoglu, S.; Hatipoglu, N. K.; Evliyaoglu, O.
    Objective: The aim of the present study was to evaluate the levels of serum androgens and prostate-specific antigen (PSA) levels in patients with endometriosis. Materials and Methods: Patients with Stage III/IV(advanced stage) endometriosis were compared to controls with respect to basal serum levels of total testosterone (T), free testosterone (fT), androstenedion (A), dehydroepiandrosterone (DHEA), dehydroepiandrosterone-sulphate (DHEA-S), and PSA in the early follicular phase of menstrual cycle for this prospective case control study. Results: Level of T, IT, A, DHEA, and DHEA-S were higher in patients with endometriosis when compared to control subjects, but the difference was not statistically significant. The mean PSA level was 0.0074 +/- 0.0120 ng/ml in patients with endometriosis and 0.0059 +/- 0.0056 ng/ml in control group and there was no statistically significant difference between groups (p = 0.58). Conclusion: Serum basal androgens and PSA levels are higher in endometriosis group with respect to control but the differences are not statistically significant.
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    Serum Levels of Lipids, Lipoproteins and Paraoxonase Activity in Pre-eclampsia
    (Sage Publications Ltd, 2011) Demir, B.; Demir, S.; Atamer, Y.; Guven, S.; Atamer, A.; Kocyigit, Y.; Hekimoglu, A.
    Serum paraoxonase 1 (PON1) activity and the oxidation of lipoproteins were investigated in 35 women with preeclampsia and in 35 healthy control women with normal pregnancies. Blood pressure, body mass index (BMI), serum levels of total cholesterol, triglycerides, high-density lipoprotein (HDL), low-density lipoprotein (LDL), apolipoprotein A1 (ApoA1), apolipoprotein B (ApoB) and lipoprotein (a) (Lp[a]), and PON1 activity were assessed. There were no significant between-group differences in subject age, gestational age at diagnosis of preeclampsia, BMI, serum total cholesterol, triglycerides, LDL and ApoB levels. Mean systolic and diastolic blood pressures and serum Lp(a) were significantly higher in subjects with pre-eclampsia than in controls. Mean serum HDL, ApoA1 and PON1 activity were significantly lower in subjects with pre-eclampsia compared with controls. In conclusion, lipids and oxidized lipoproteins may play important roles in the pathogenesis of preeclampsia.