Yazar "Demir, Osman" seçeneğine göre listele

Listeleniyor 1 - 7 / 7
  • Küçük Resim Yok
    Öğe
    A comparative study of the 5 mm-layer Vickers hardness model with bulk-fill resin-based composites
    (2021) Bal, Fatma Aytaç; Ağaccioğlu, Merve; Demir, Osman
    Aim: The aim of this study was to compare the Vickers hardness numbers\r(VHNs) of two bulk-fill resin-based composites (BFRBC) and a conventional\rhybrid resin-based composite (RBC) through the layers of a 5mm thickness\rmodel with two different light-curing time intervals.\rMethodology: In the present study, a sonic-activated and dual-cure\rBFRBC, and a conventional hybrid RBC were used. Semi-cylindrical\rspecimens 4 mm in radius and 5 mm in height were prepared using a twopiece stainless-steel mold (n=10). The BFRBCs allowed a single 5mm\rincrement to be introduced into the molds, whereas hybrid RBC was\rincremented (2+2+1 mm). Two different time intervals were applied for\rthe light-curing (irradiance of 1200 mW/cm2) of each material (hybridsonic-activated bulk-fill, 20 s and 40 s; dual-cure bulk-fill, 7 s and 15 s).\rVHN measurements were carried out from top to bottom at every 1 mm of\rthe specimen thickness. Data were analyzed using three-way and two-way\rANOVA for the VHN and bottom/top ratios and Bonferroni correction for\rmultiple comparisons (p=0.05).\rResults: For each layer and time interval groups, there was a significant\rdifference between the materials. The highest VHN was found within\rhybrid groups, whereas dual-cure bulk-fill groups showed the lowest\rresults. Sonic-activated bulk-fill had the lowest bottom/top ratios, which\rwere significantly different from those of the other materials. There was\rno significant difference between the different time intervals for\rbottom/top ratios within each material.\rConclusion: Increased irradiation intervals positively affected the VHN\rof hybrid and dual-cure bulk-fill. BFRBCs showed clinically acceptable\rbottom/top hardness ratios.
  • Küçük Resim
    Öğe
    Effect of non-surgical periodontal therapy on the degree of gingival inflammation and stress markers related to pregnancy
    (Univ Sao Paulo Fac Odontologia Bauru, 2018) Yarkaç, Fatma Uçan; Göktürk, Özge; Demir, Osman
    Objectives: The purpose of this study was to determine the impact of non-surgical periodontal therapy considering the salivary stress-related hormone and cytokine levels in the gingival crevicular fluid (GCF) on pregnant and non-pregnant women. Material and Methods: Thirty non-pregnant (control group) and 30 pregnant women (test group) that met the study inclusion criteria were chosen. Only participants with gingivitis were included. Clinical data and samples of GCF and saliva were collected at baseline and after periodontal therapy. The levels of interleukin-1 beta (IL-1 beta and IL-10, and concentration of salivary chromogranin A (CgA) hormone were analyzed by enzyme-linked immunosorbent assay (ELISA). The repeated measures analysis of variance was used for intragroup and intergroup analyses. Results: A major decrease in the gingival inflammation was observed in both groups after periodontal therapy (p<0.05). Periodontal treatment decreased the level of IL-1 beta in GCF (p<0.05) in control group, but no statistical difference was determined for GCF IL-1 beta in the test group. However, after periodontal therapy, the CgA hormone concentration was reduced in both groups (p<0.05). However, there was no difference in salivary CgA concentration, GCF IL-10 levels, and perceived stress scale (PSS)-10 between the groups (p>0.05). Conclusions: Within the limitations of this study, periodontal therapy significantly improved the periodontal status and stress level. In addition, the severity of the gingival inflammation during pregnancy was related to stress. However, further studies will be needed to substantiate these early findings.
  • Küçük Resim Yok
    Öğe
    The effect of periodontal treatment on depression, bodyimage, self esteem and anxiety in individuals:A randomized controlled clinical trial
    (2021) Güktürk, Özge; Inanir, Sema; Yüce, Hatice Balci; Demir, Osman; Türkal, Hümerya Aydemir
    Aim: Depression is a multi-factorial disease characterized by a variety of symptoms. Individuals with psychiatric disorders areseem to be more prone to periodontitis. However, depression and periodontal disease can be considered bidirectional risk factors.Periodontal diseases can also be an effect on depression. The aim of this study is to determine the effect of non-surgical mechanicalperiodontal treatment on psychological state.Materials and Methods: Two randomized groups were established from depressed patients with non-treated periodontal diseases.Test (n = 92) and control group (n = 92). Clinical periodontal and psychological measures were administered at baseline and at 6weeks in the control and test group. Periodontal treatment was applied to the test group.Results: After 6 weeks (the end of the periodontal therapy) there was a significant decrement in the results of Beck DepressionInventory (pa= 0.038) and a significant increment in Body Cathexis Scale (pa< 0.001) results in the test group. However, the resultsof Rosenberg Self-Esteem Scale (pa= 0.820) and Beck Anxiety Inventory (pa= 0.071) is similar between test and control groups.Conclusion: Within the limits of present study, the results suggest that periodontal treatment might be useful to improve depressivepatients’ psychological conditions.
  • Küçük Resim
    Öğe
    Effectiveness of various irrigation protocols in removing calcium hydroxide from root canals
    (2018) Göktürk, Hakan; Özkoçak, İsmail; Büyükgebiz, Fevzi; Demir, Osman
    Objective: The purpose of this study was to investigate the removal efficiency of calcium hydroxide (CH) by CanalBrush, Vibringe, laser-activated irrigation (LAI), conventional syringe irrigation (CSI), XP-endo Finisher, and passive ultrasonic irrigation (PUI) in the root canal walls. Materials­ and­ Methods:­ Ninety-eight human mandibular premolar teeth were prepared. Root canals were filled with CH. The roots were divided into six experimental groups (n=15/group) according to the irrigation protocol used: group 1 (CSI), group 2 (Vibringe), group 3 (CanalBrush), group 4 (XP-endo Finisher), group 5 (PUI), and group 6 (LAI). The amount of residual CH in the canal walls for each canal third was scored. Data were analysed by using Kruskal-Wallis and Bonferroni-correction Mann-Whitney U tests. Results: None of the investigated protocols renders the root canal walls free of CH remnants. Significant differences were found between tooth regions in terms of CH removal (p<0.05), and all groups except group 6 (LAI) showed more residual CH in the apical region. PUI and LAI eliminated significantly more CH than CSI from the middle and apical thirds of the root canal, respectively. Conclusion: The activation of sodium hypochlorite with various devices increased CH removal at the apical and middle part of the canal. LAI and PUI produce better results in the apical and middle thirds, respectively.
  • Küçük Resim
    Öğe
    Evaluation of pharyngeal airway by cone-beam computed tomography after mono- and bimaxillary orthognathic surgery
    (Wolters Kluwer Medknow Publications, 2022) Sarı, Merve; Şen, Esengül; Akbulut, Nihat; Bayrak, Seval; Demir, Osman
    Introduction: The aim of this study was to evaluate the changes of the pharyngeal airway obtained using mono-and bimaxillary orthognathic surgery in patients with skeletal malocclusion. Material and Methods: The analysis was conducted on cone-beam computed tomography images taken preoperatively and postoperatively of patients undergoing mono-or bimaxillary orthognathic surgery. The pharyngeal airway was divided into four airway volume segments and measured by planimetry. Results: The bimaxillary surgery group showed an increase in nasopharynx and velopharynx volumes and a decrease in glossopharynx and hypopharynx volumes (P < 0.05). The mandibular setback surgery group showed decreases in glossopharynx, hypopharynx, oropharynx, and pharynx volumes (P < 0.05). The mandibular advancement surgery group showed increases in glossopharynx, hypopharynx, oropharynx, and pharynx volumes (P < 0.05). The maxillary advancement surgery group showed increases in nasopharynx, velopharynx, and pharynx volumes (P < 0.05). Discussion and Conclusion: Mandibular setback surgery had a narrowing effect on the pharyngeal airway volume. Maxillary advancement surgery compensated for the constrictive effect of mandibular setback surgery on both the oropharynx and pharynx volumes. Although maxillary and mandibular advancement surgery affected different sites, these were the operations that contributed most to the increase in pharyngeal volume.
  • Küçük Resim
    Öğe
    Farklı irrigasyon tekniklerinin ikili antibiyotik patını kök kanalından uzaklaştırmadaki etkisi
    (2017) Göktürk, Hakan; Özkoçak, İsmail; Büyükgebiz, Fevzi; Demir, Osman
    Farklı yıkama işlemlerinin kök kanal duvarlarından ikili antibiyotik patını (İAP) uzak-- laştırmadaki etkinliklerini incelemektir. Gereç ve Yöntemler: Doksan sekiz çürüksüz üst çene ön dişin kök kanal preparasyonu apikal ana eğe R40 olacak şekilde tamamlandı. Dişler rastgele deney (n=15) ve iki kontrol grubuna (n=4) ayrıldı. Negatif kontrol grubundaki dişler hariç tüm dişlerin kök kanalları bir lentülo yardımıyla İAP ile dolduruldu. Üç hafta sonra İAP'sı Grup l'de geleneksel iğne irrigasyonu, Grup 2'de CanalBrush, Grup 3'te XP-endo Finisher, Grup 4'te Vibringe, Grup 5'te pasif ultrasonik aktivasyon, Grup 6'da lazer ile aktivasyon yöntemi ile uzaklaştırıldı. Dişler uzun aksı bo-- yunca ikiye ayrılıp kök kanal duvarlarında kalan İAP'sı miktarı her bir kök üçlüsü için stereomik-- roskop altında skorlandı. Veriler, Kruskal--Wallis ve Bonferroni--Düzeltmeli Mann--Whitney testleri kullanılarak analiz edildi. Bulgular: Koronal bölgede gruplar arasında istatistiksel fark sap-tanmadı (p>0,05). Orta bölgede Grup ve 6; Grup ve hariç diğer gruplara göre istatistiksel ola-- rak daha fazla İAP uzaklaştırdı (p<0,05). Apikal bölgede Grup istatistiksel olarak Grup 1, ve 4'e üstün bulundu (p<0,05). Sonuç: İncelenen irrigasyon tekniklerinin hiç biri kök kanal duvarların-- dan lAP'nı tamamen uzaklaştıramamıştır.
  • Küçük Resim
    Öğe
    Interaction between stress, cytokines, and salivary cortisol in pregnant and non-pregnant women with gingivitis
    (Springer Verlag, 2018) Yarkaç, Fatma Uçan; Göktürk, Özge; Demir, Osman
    Objectives: The aim of this study was to compare the effects of periodontal treatment on the inflammatory markers in gingival crevicular fluid and the concentration of salivary cortisol between non-pregnant and pregnant women with gingivitis. Materials and methods: This study included 30 non-pregnant women (mean age 27.93 ± 6.61 years) and 30 pregnant women (mean age 28.93 ± 4.04 years). Each participant presented with the clinical symptoms of generalized, moderate-to-severe gingivitis. Saliva samples were collected by using the spitting method, and gingival crevicular fluid (GCF) samples were collected by using the intrasulcular method at baseline and after 3 weeks. Non-surgical periodontal treatment (NPT) comprising scaling and oral hygiene instruction was administered after sample collection. The interleukin-6 and interleukin-10 levels in GCF and salivary cortisol concentrations were determined with using enzyme-linked immunosorbent assay. Results: The pregnant women exhibited significantly deeper pockets (p < 0.05) and greater gingival inflammation (p < 0.05) than the non-pregnant women after periodontal therapy. Moreover, the levels of interleukin-6 in the GCF were significantly higher in the pregnant women compared to the non-pregnant women after periodontal therapy: 17.73 ± 9.82 pg per site and 8.08 ± 4.51 pg per site, respectively, p < 0.05. No differences in the levels of interleukin-10 were observed. The pregnant women also exhibited higher cortisol concentration in the saliva after periodontal therapy, compared to the non-pregnant women, while the levels of stress (as seen on the perceived stress scale-10) were similar in both groups. Conclusions: Although non-surgical periodontal therapy may reduce the clinical parameters of gingivitis, increasing levels of stress in pregnancy may reduce the individual’s response to it. However, further studies are necessary to substantiate these early findings. Clinical relevance: Psychosocial stress may increase the risk of periodontal disease by altering the behavioral and immune responses of the individual. Therefore, the levels of stress should be taken into consideration in order to increase the efficacy of periodontal therapy in pregnant patients. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.