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    Does Temporomandibular Joint Magnetic Resonance Imaging Diagnosis Support Clinical Examination Diagnosis Following Diagnostic Criteria for Temporomandibular Disorders?
    (W B Saunders Co-Elsevier Inc, 2023) Balel, Yunus; Yildiz, Serkan; Gokce, Erkan; Tumer, Mehmet Kemal; Ege, Bilal
    Purpose: The Diagnostic Criteria for Temporomandibular Disorders (DC/TMD) has been validated as a clinical diagnostic guideline with high-sensitivity and -specificity in identifying TMDs. The purpose of this study was to evaluate the agreement between DC/TMD diagnoses and magnetic resonance imaging (MRI) diagnoses in patients with TMD. Methods: A prospective cohort study was conducted on patients with TMD. The predictor variable was the clinical diagnosis of TMD based on DC/TMD criteria. The outcome variable was the MRI diagnosis of TMD. The diagnoses used for both the predictor variable and the outcome variable were the same. They were normal, disc displacement with reduction (DDWR), DDWR with intermittent locking, disc displacement without reduction (DDWOR) with limited opening, DDWOR without limited opening, degenerative joint disease, and subluxation. Age and gender of the patients and number of joints evaluated were covariates. Each subject had clinical examination performed by two independent Oral and Maxillofacial Surgeons. All subjects had a bilateral temporomandibular joint (TMJ) MRI performed which was evaluated by a radiologist. The correlation between the clinical and MRI diagnoses was calculated using Cohen's kappa value with a P value of <.05 considered significant. Results: A total of fifty patients (100 TMJs) were enrolled with 38 females and 12 males. The mean ages were 31.92 and 31.75 years, respectively, with a total of 100 TMJs analyzed. Internal derangement was clinically identified in 76% of the joints and with MRI in 69% of joints. The Cohen's kappa value between DC/TMD and MRI diagnoses was found to be kappa = 0.720 (P < .01). The respective sensitivity and specificity in determining disc position clinically for DDWR was 1 and 0.96; for DDWR with intermittent locking 0.78 and 0.91; for DDWOR with limited opening 0.9 and 0.98; for DDWOR without limited opening 1 and 0.9; for degenerative joint disease 0.63 and 0.97 and for subluxation 0.28 and 1.00. Conclusion: The DC/TMD clinical examination performed well in all types of disc displacement but is less reliable than MRI in detecting the presence of degenerative disc diseases and subluxation. (C) 2023 American Association of Oral and Maxillofacial Surgeons
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    Evaluation of prevalence of temporomandibular disorders based on DC/TMD Axis I diagnosis in Turkish population and correlation with Axis II
    (Elsevier, 2023) Yildiz, Serkan; Balel, Yunus; Tumer, Mehmet Kemal
    Purpose: The prevalence of DC / TMD diagnosis of individuals with internal derangement of TMJ who want to receive TMD treatment in a tertiary clinic in the Turkish population and comparison of the criteria applied in Axis I and Axis II. Methods: This study was carried out on 200 individuals older than 18 years of age who have internal disorder of Temporomandibular Joint (TMJ). Diagnostic Criteria for Temporomandibular Disorders (DC / TMD) Axis I and II were applied. Results: The female to male ratio of individuals with internal derangement of TMJ in the Turkish population was 3.5. The Pearson correlation coefficient between the internal derangement of the Right TMJ and the internal derangement of the Left TMJ is 0.804 and has a statistically significant relationship (p <0.05). Conclusions: For DC / TMD, a more comprehensive study is needed to compare the results found in the Turkish population with other populations. (c) 2022 Published by Elsevier Masson SAS.
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    Role of VEGF I/D variant in suspectibility to odontogenic cyst formation
    (Taylor & Francis Inc, 2023) Yildiz, Serkan; Nursal, Ayse Feyda; Yigit, Serbulent; Tumer, Mehmet Kemal
    Odontogenic cysts, are located in the jawbones, filled with fluid surrounded by epithelial lining and fibrous connective tissue. Vascular endothelial growth factor (VEGF) can induce physiological and pathological angiogenesis and is an endothelial cell-specific mitogen. The aim of the present study was to investigate whether any possible association between the VEGF insertion/deletion (I/D) variant and odontogenic cyst in Turkish population. Clinical information and venous blood samples were collected from 62 odontogenic cyst patients and 98 healthy controls. DNA was isolated from peripheral blood leukocytes. Genotyping of the VEGF I/D variant was done by the polymerase chain reaction (PCR) method. There was a statistically differece in terms of VEGF I/D allele frequencies between patients and controls. VEGF I/D variant I allele frequency was more prevalant in patients compared to controls (p = 0.006411, OR: 2.08, 95%Cl: 1.322-3.272). A statistically significant association was observed when the patients were compared with the controls according to D/D + I/D versus I/I genotype (p = 0.0508, OR: 1.925, 95%Cl: 0.872-4.246). The genotype distribution of VEGF I/D was not statistically different between patients and controls (p > 0.05). For the first time, our results provided evidence supporting the odontogenic cyst formation associated with the I/D variant at the promoter region of the VEGF gene in a group of Turkish population. Although it was seen in our study that the I/D variant in the promoter region of the VEGF gene supports odontogenic cyst formation, large-scale studies are needed to elucidate the effect of this variant on odontogenic cysts.
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    The Vitamin D Receptor Bsm1 Variant is not Associated With Temporomandibular Disorder With or Without Bruxism
    (2024) Yildiz, Serkan; Yigit, Serbulent; Nursal, Ayse Feyda; Karakus, Nevin; Tumer, Mehmet Kemal
    Background: Temporomandibular joint disorder (TMD), a set of conditions that affect the temporomandibular joint and related structures, is frequently linked to bruxism. The vitamin D receptor (VDR) affects calcium absorption, bone remodeling, and mineralization rate. The goal of this study was to evaluate the role of the VDR Bsm1 (rs1544410) variant in the susceptibility to bruxism in TMD. Method: A total of 321 people [221 TMD patients (135 with bruxism and 86 without bruxism) and 100 healthy controls] were included in the study. The VDR Bsm variant was genotyped using the PCR-RFLP method. Results: We found no significant difference between the all-TMD patient group and the control group regarding the VDR Bsm1 genotype and allele distribution (p>0.05). There was no deviation from HWE for the VDR variant in groups. There was no relationship between pain characteristics and VDR Bsml genotype distribution in patients with bruxism. Conclusions: Our results support the conclusion that the VDR Bsm1 variant is not a risk factor for the development of bruxism in TMD. The effect of the VDR Bsml variant on the risk of bruxism in TMD should be investigated in studies involving larger populations and other ethnicities.