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Comparison of One-Step and Multistep Polishing Systems for the Surface Roughness of Resin Composites

Open Journal of Stomatology 2016年第3期6卷 73-80页

作者： Ismail Hakkı Baltacıoğlu Ozgur Irmak Nuran Ulusoy esra cengiz Yıldırım Hakan Bağış Department of Restorative Dentistry Faculty of Dentistry Ankara University Ankara Turkey Department of Restorative Dentistry Faculty of Dentistry Osmangazi University Eskisehir Turkey Department of Restorative Dentistry Faculty of Dentistry Near East University Mersin Turkey

Aim: This study analyzed the effect of different finishing and polishing systems on the surface roughness of a microfilled (Amaris), and a nanofilled resin composite (Clearfil Majesty Esthetic) using Scanning electron microscope (SEM) analysis and surface roughness tester. Materials and Methods: Thirty five specimens of each material were prepared in a plexiglass mold (10 mm in diameter and 2 mm in depth) and cured against a Mylar matrix strip to create a baseline surface. The average surface roughness was measured using a surface profilometer (Mahr Perthometer SP4, Germany) in three different positions on each sample before and after finishing with one of the seven finishing procedures: Procedure 1: Mylar strip (control), Procedure 2: Tungsten carbide burs, Procedure 3: Diamond burs, Procedure 4: Procedure 2 + one-step diamond micropolisher (PoGo), Procedure 5: Procedure 2 + multi-step discs (Super-snap), Procedure 6: Procedure 3 + one-step diamond micropolisher (PoGo), Procedure 7: Procedure 3 + multi-step discs (Super-snap). The obtained data were analyzed using two-way analysis of variance (ANOVA) and Duncan test at a p = 0.05 significance level. Results: Nanofilled composite showed significantly lower Ra values than microfilled composite in procedures 4, 6 and 7 (p 0.05). Conclusion: Nanofilled resin composite showed significantly lower Ra values than microfilled resin composite. Regardless of finishing methods, diamond micro-polisher produced smoother surfaces than polishing discs.

关键词： Surface Roughness Resin Composites One-Step Polishing

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MOTIONS OF CURVES IN THE GALILEAN SPACE G_3

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Acta Mathematica Scientia 2015年第5期35卷 1046-1054页

作者： Ufuk OZTURK Suleyman cengiz esra Betul KOC OZTURK Department of Mathematics Faculty of Science ank?r? Karatekin University

In this article, we study the flows of curves in the Galilean 3-space and its equiform geometry without any constraints. We find that the Frenet equations and the intrinsic quantities of the inelastic flows of curves are independent of time. We show that the motion of curves in the Galilean 3-space and its equiform geometry are described by the inviscid and viscous Burgers＇ equations.

关键词： Galilean geometry equiform geometry motions of curves inextensible flows Burgers' equation Frenet frames

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Multi-institutional analysis of cervical esophageal carcinoma patients treated with definitive chemoradiotherapy: TROD 01-005 study

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Oncology Research 2023年第3期31卷 299-306页

作者： OZAN CEM GULER EZGI OYMAK GOZDE YAZICI OZLEM OZKAYA AKAGUNDUZ OGUZ CETINAYAK PETEK ERPOLAT ATIL AKSOY MURSEL DUZOVA BERNA AKKUS YILDIRIM MERAL KURT EMINE CANYILMAZ GULER YAVAS SERAP AKYUREK DIDEM COLPAN OKSUZ esra KAYTAN SAGLAM OMUR KARAKOYUN CELIK ENIS OZYAR MUSTAFA cengiz CEM ONAL Department of Radiation Oncology Faculty of MedicineBaskent UniversityAdana Dr.Turgut Noyan Research and Treatment CenterAdanaTurkey Radiation Oncology Unit Iskenderun Gelisim HospitalHatayTurkey Department of Radiation Oncology Faculty of MedicineHacettepe UniversityAnkaraTurkey Department of Radiation Oncology Faculty of MedicineEge UniversityIzmirTurkey Department of Radiation Oncology Faculty of Medicine9 Eylul UniversityIzmirTurkey Department of Radiation Oncology Faculty of MedicineGazi UniversityAnkaraTurkey Department of Radiation Oncology Faculty of MedicineAkdeniz UniversityAntalyaTurkey Department of Radiation Oncology Faculty of MedicineSelcuk UniversityKonyaTurkey Radiation Oncology Unit Prof.Dr.Cemil Tascioglu HospitalİstanbulTurkey Department of Radiation Oncology Faculty of MedicineUludag UniversityBursaTurkey Department of Radiation Oncology Faculty of MedicineKaradeniz Technical UniversityTrabzonTurkey Department of Radiation Oncology Faculty of MedicineBaskent UniversityAnkaraTurkey Department of Radiation Oncology Faculty of MedicineAnkara UniversityAnkaraTurkey Department of Radiation Oncology Faculty of MedicineIstanbul University CerrahpasaIstanbulTurkey Radiation Oncology Unit Memorial Sisli HospitalIstanbulTurkey Department of Radiation Oncology Faculty of MedicineCelal Bayar UniversityManisaTurkey Department of Radiation Oncology Acibadem University Maslak HospitalIstanbulTurkey

The aim of this study was to examine the prognostic factors and treatment outcomes of cervical esophageal carcinoma(CEC)patients who underwent definitive chemoradiotherapy(CRT).The clinical data of 175 biopsyconfirmed CEC patients treated with definitive CRT between April 2005 and September 2021 were retrospectively *** prognostic factors predicting overall survival(OS),progression-free survival(PFS),and local recurrence-free survival(LRFS)were assessed in uni-and multivariable *** median age of the entire cohort was 56 years(range:26–87 years).All patients received definitive radiotherapy with a median total dose of 60 Gy,and 52%of the patients received cisplatin-based concurrent *** 2-year OS,PFS,and LRFS rates were 58.8%,46.9%,and 52.4%,respectively,with a median follow-up duration of 41.6 ***’performance status,clinical nodal stage,tumor size,and treatment response were significant prognostic factors for OS,PFS,and LRFS in univariate ***-complete treatment response was an independent predictor for poor OS(HR=4.41,95%CI,2.78–7.00,p<0.001)and PFS(HR=4.28,95%CI,2.79–6.58,p<0.001),whereas poor performance score was a predictor for worse LRFS(HR=1.83,95%CI,1.12–2.98,p=0.02)in multivariable ***-two patients(29.7%)experienced grade II or higher *** this multicenter study,we demonstrated that definitive CRT is a safe and effective treatment for patients with *** radiation doses were found to have no effect on treatment outcomes,but a better response to treatment and a better patient performance status did.

关键词： Esophageal cancer Chemoradiotherapy Radiotherapy Local control Toxicity Survival

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