Person: ŞAHİNBAŞ, ABDURRAHMAN
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Publication Metadata only THE FLEXURAL STRENGTH, SURFACE HARDNESS AND SURFACE ROUGHNESS OF 3D PRINTED DENTURE BASE MATERIAL(2019-09-06T00:00:00Z) Şahinbaş, Abdurrahman; Burduroğlu, Hatice Defne; ŞAHİNBAŞ, ABDURRAHMAN; BURDUROĞLU, HATİCE DEFNEKeywords: 3d printing, Denture base, Surface RoughnessPurpose/Aim: The aim of this study was to evaluate the flexural strength, surface hardness and surface roughness of denture basematerials, which has produced with different production methods.Materials and Methods: Production methods to be used in this study are a conventional flasking method (Group C) N=8 and additivemanufacturing method (Group A) N=8. As an additive manufacturing method, Envisiontec Vida 3D printer and E-Denture 3D+ denturebase material (ENVISIONTEC GMBH Gladbeck, Germany) and as a conventional flasking method Meliodent® Heat Cure (KulzerGMBH Hanau, Germany) were used. Flexural strength was assessed with a three-point bending test using a universal testing machine(Shimadzu AGS-X, Columbia, Maryland). Disk specimens were subjected to surface roughness test with a profilometer (MarSurfM300C, Mahr GMBH Göttingen, Germany) and Vickers Hardness test (Shimadzu HMV, Columbia, Maryland) after finishing andpolishing procedures.Results: Mean flexural strength of Group C is 69,8N ±8,2N and Group A is 57,2N ±1,17N. Mean Ra Values of Group C is 0,065±0,027, and Group A is 0,051 ±0,02. Mean Vickers Hardness Values of Group C is 16,19 ± 0,078 and Group A is 9,9 ±0,82. For thegroup comparisons, Mann Whitney U test was used (p<0,05). There are statistical differences between groups in Vickers HardnessValues p=0,001, and in flexural strength values p=0,001. But there is no statistically differences in surface roughness levels between thegroups p=0,248.Conclusions: Additive manufacturing methods can be used to produce denture bases, but further studies are needed to use this methodsafely.Publication Metadata only Chairside Restoration of a Broken Central Incisor(2018-05-10T00:00:00Z) Taha, Esad; Burduroğlu, Hatice Defne; Şahinbaş, Abdurrahman; BURDUROĞLU, HATİCE DEFNE; ŞAHİNBAŞ, ABDURRAHMANPublication Metadata only Effect of different mechanical cleansing protocols of dentin for recementation procedures on micro-shear bond strength of conventional and self-adhesive resin cements(2013-03-01T00:00:00Z) Bavbek, A. B.; Goktas, B.; Sahinbas, ABDURRAHMAN; Ozcopur, B.; Eskitascioglu, G.; Ozcan, M.; ŞAHİNBAŞ, ABDURRAHMANService life of debonded indirect dental restorations could be prolonged by recementation. This process requires removal of cement remnants from dentin. This study evaluated the effect of different mechanical cleansing protocols of dentin for recementation procedures on micro-shear bond strength (mu SBS) of conventional and self-adhesive resin cements. The labial surfaces mandibular incisors (N=200) were ground with a low speed saw to expose the corona] dentin. The teeth were randomly divided into two subgroups (n: 100 per group) and received either (a) conventional (Panavia F 2.0, Kuraray, PAN) or (b) self-adhesive (Clearfil SA, Kuraray, CSA) resin cement. Resin cements were condensed into polyethylene molds incrementally and photo polymerized using an LED polymerization unit. Specimens were stored in distilled water at 37 degrees C for 24 h and subjected to mu SBS (0.5 mm/min). Resin cement remnants on bonded dentin surfaces were removed using by (a) composite finishing bur (cb), (b) tungsten carbide bur (ob), (c) ultrasonic scaler tip (sc) or (d) pumice-water slurry (pw). Non-cleaned teeth acted as the control group (cn) (n: 20 per subgroup). After cleaning, the same cement type was rebonded simulating clinical recementation. Failure types were analyzed using optical microscope and Scanning Electron Microscope (SEM). Data (MPa) were analyzed using Wilcoxon Signed Ranks, Mann-Whitney U and Bonferroni tests (alpha=0.05). Overall, CSA (6.42 +/- 2.96) showed significantly lower results than that of PAN cement (7.88 +/- 3.49) (p 0.05) expect cb method (3.42 +/- 1.47) (p < 0.05). Remnants of cements were detected on dentin surfaces in all groups at varying degrees. SEM showed that while using pumice-water slurry was the least effective for PAN, tungsten carbide bur was the most effective for both cements. All other methods showed similar cleansing efficacy. None of the cleansing protocols yielded to complete removal of resin cement rest on dentin upon recementation for both cements tested. (C) 2012 Elsevier Ltd. All rights reserved.Publication Metadata only Fiberle Güçlendirilmiş Rezin Altyapi Materyalinin Tam Seramik Kronlarin Dayanimina Etkisi(2018-09-30) ŞAHİNBAŞ, ABDURRAHMAN; Eskitaşçıoğlu, Gürcan; ŞAHİNBAŞ, ABDURRAHMANPublication Metadata only 3 month follow-up of rehabilitation with telescopic crown: Case report.(2018-05-10T00:00:00Z) Kanpalta, Burcu; Şahinbaş, Abdurrahman; Burduroğlu, Hatice Defne; ŞAHİNBAŞ, ABDURRAHMAN; BURDUROĞLU, HATİCE DEFNEPublication Metadata only An Overdenture Treatment of a Young Patient: A Case Report(2019-09-06T00:00:00Z) Arslan, Emel; Şahinbaş, Abdurrahman; ŞAHİNBAŞ, ABDURRAHMANPublication Metadata only Multidisciplinary Treatment of Oligodontics and Lateral Openbite Case(2019-05-01T00:00:00Z) Yücesoy, Türker; Haydarpaşa, Melis; Dolanmaz, Doğan; Balaban, Abdurrahman; Şeker, Elif Dilara; Şahinbaş, Abdurrahman; DOLANMAZ, DOĞAN; YÜCESOY, TÜRKER; ŞEKER, ELIF DILARA; ŞAHİNBAŞ, ABDURRAHMAN