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    The 50 Most-Cited Articles on Polyetheretherketone (PEEK): A Bibliometric Analysis
    (Pera Yayincilik Hizmetleri, 2023) Erdinc, Gulbahar
    Objectives: The aim of this study was to perform a bibliometric and visualized analysis to identify and critically assess the 50 most highly cited articles on polyetheretherketone (PEEK). Methods: The electronic search was made to identify detailed literature sources using the Clarivate-owned Web of Science (WoS) database. The terms used in the literature search are polyetheretherketone, poly ether ether ketone and peek. All articles from the search results were ranked according to citation counts, and the 50 articles that received the most citations were selected. The results were summarized and processed in a spreadsheet. Results: 380 articles were displayed due to the search, and 50 of the most cited articles were included in the present study. Schilmidin and Stawarczyk, who have 12 papers and 974 citations, were identified as the most productive and influential researchers with equal citations and publications. Dental Materials (26%) has the highest number of publications, and Germany was determined as the most productive country. Conclusion: Considerable advancement has been made in PEEK, as demonstrated by the increase in the number of publications linked with collaboration among various authors, nations, and institutes.
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    Covid-19 Pandemic and Its Effects on Dentistry: A Retrospective Study
    (Marmara Univ, Inst Health Sciences, 2021) Erdinc, Gulbahar; Cirakoglu, Neslihan Yilmaz
    Objective: The purpose of this study was to compare patient admissions, treatment needs, and treatments in our hospital before and after the Covid-19 pandemic. Methods: The patients who presented to Karabuk Oral Dental Health Training and Research Hospital between March 2019 and March 2021 were retrospectively evaluated. The data obtained were used to compare the 1-year process after the Covid-19 pandemic and the 1-year process before the Covid-19 pandemic. In this 2-year period, the number of hospital registrations, distribution of patients by gender, age data, type, and the number of procedures performed were obtained from the software system used in the hospital. Results: The average number of patients admitted to the hospital per month in 1 year before the pandemic is approximately 3.5 times in the next 1 year. When the number of patients applying was evaluated in terms of gender, it is seen that the number of male patients decreased more than women during the pandemic period. It has been observed that there is a dramatic decrease in the pandemic period in all treatments. Conclusion: With the Covid-19 pandemic, there has been a serious decrease in the number of patients. However, with the ongoing treatment needs and normalization processes of the patients, necessary precautions were taken and the treatment of the patients continued.
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    Effect of mastication simulation on the phase transformation of posterior 3-unit monolithic zirconia fixed dental prostheses
    (Mosby-Elsevier, 2021) Erdinc, Gulbahar; Bulbul, Mehmet
    Statement of problem. Monolithic zirconia restorations are directly exposed to cyclic loads and temperature changes in the oral cavity after cementation. These stresses may reduce the long-term success of the material by causing uncontrolled phase transformations within the zirconia. Purpose. The purpose of this in vitro study was to evaluate the effect of mastication simulation and different measurement points on the phase transformation of posterior 3-unit monolithic zirconia partial fixed dental prostheses (FDPs) in the posterior region. Material and methods. Posterior 3-unit FDPs of monolithic yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP), including BruxZir Shaded (group B), FireZr (group F), and Upcera (group U) (n=10), were machined from presintered blocks. All specimens were exposed to mastication simulation (240000 cycles/1.7 Hz/50 N). The monoclinic phase content was evaluated by X-ray diffraction (XRD). Phase transformation was measured at the mesial connector (group M), distal connector (group D), and pontic regions (group P) before and after mastication simulation. The relative monoclinic phase amount (Xm) was calculated for all specimens. The data were analyzed by ANOVA and post hoc tests (alpha=.05). Results. According to XRD analysis, Xm for all groups and regions showed higher results after aging than before aging (P<.05). Group B has the lowest Xm among the groups. Group B showed a statistically significant difference compared with both group F and group U (P<.05). There was no significant difference between group F and group U (P>.05). When the regions were evaluated regardless of brand and the groups were evaluated in terms of regions, no statistically significant difference was observed between connectors and the pontic region (P>.05). Conclusions. Mastication simulation causes an increase in the Xm. However, this increase was unlikely to be clinically significant. There may be differences in phase transformation depending on the contents of the brands and sintering procedures. Variations in the phase quantity were independent of the connector regions and pontic for FDPs.
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    Fracture strength and energy-dispersive spectroscopy analysis of 3-unit fixed partial dentures fabricated from different monolithic zirconia materials
    (Mosby-Elsevier, 2023) Erdinc, Gulbahar; Bulbul, Mehmet; Ozcan, Mutlu
    Statement of problem. Mastication forces in different regions affect the survival of multiunit posterior restorations. The fracture strength of 3-unit posterior monolithic zirconia fixed partial dentures (FPDs) and their fracture patterns require investigation. Purpose. The purpose of this in vitro study was to evaluate and compare the fracture strength and fracture pattern of 3-unit posterior FPDs fabricated from different monolithic zirconia materials. Material and methods. Thirty 3-unit FPDs were fabricated from BruxZir, FireZr, and Upcera (n=10 per group). Energy-dispersive spectroscopy analysis was performed on 2 selected specimens from each group. All specimens were exposed to a mastication simulator for 1.2x106 cycles and then monotonically loaded to fracture at a crosshead speed of 1 mm/min. The surfaces of a selected fractured specimen were examined at magnifications of x25 and x500 with scanning electron microscopy. Conformity to normal distribution was evaluated with the Shapiro-Wilk test. Oneway analysis of variance was used to compare the normally distributed initial crack formation load F initial (Fi) and catastrophic failure strength F maximum (Fm) means by group. Weibull statistics were calculated by using the maximum likelihood estimation method. The chi-square test was used to compare shape and scale parameters (a=.05). Results. The mean Fm values were fail1878.9 N for Upcera, 2177.8 N for BruxZir, and 2229.4 N for FireZr. Upcera and BruxZir showed statistically significant differences for the Fm mean values (P=.039). The differences between the fracture type distributions according to the groups were statistically similar (P>.05). For Fi, Upcera presented the highest Weibull modulus value (2.199), FireZr had the lowest (1.594), while for Fm, BruxZir had the highest Weibull modulus value (9.267) and FireZr the lowest (6.572). Conclusions. Using the zirconia materials BruxZir, FireZr, and Upcera resulted in high Fm values after aging procedures. With all materials, the fractures were most commonly found in the connector areas in the tested FPDs. (J Prosthet Dent 2023;129:938.e1-e7)
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    Readability and Quality Assessment of Web-Based Information Concerning Post-Endodontic Treatment Selection
    (Pera Yayincilik Hizmetleri, 2023) Erdinc, Gulbahar; Ozdemir, Olcay
    Objectives: This study aimed to unbiasedly identify the quality and readability of the written information about post- endodontic coronal restorations on Turkish websites using accepted formulas and scales by the literature. Methods: The study was carried out by setting national pages and national locations in the Google search engine. The terms root canal treatment and veneer and root canal treatment and filling were used as keywords. The webpages were assessed independently by two readability formulas (Flesh-Kincaid and Atesman systems) and DISCERN quality kit. The independent statistical and correlation analysis were performed using Kolmogorov-Smirnov, Shapiro-Wilk, Spearman's rho, and Dunn's tests. The significance level was taken as p<0.05. Results: The initial search identified 60 websites, of which eight were excluded due to noncompliance with the study criteria (n=52). According to the DISCERN score, the web pages were categorized as fair with the highest rate of 57.69%. A statistically significant positive correlation was found between Atesman Readability Index and the Flesh-Kincaid Reading Ease score (r=0.998; p<0.001). There was no statistically significant correlation between Atesman Readability Index and DISCERN score (p=0.259). Atesman reading ease scores of the web pages are evaluated, 80.76% of these are classified as moderately difficult. Conclusions: The readability distribution of the written information about post-endodontic coronal restorations on websites was acceptable to the majority. However, being readable does not indicate that it provides sufficient target technical information. In this context, it can be suggested to use readability and quality scales while preparing websites for dental patient education concerning post-endodontic coronal restorations.