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Now showing 1 - 9 of 9
  • PublicationOpen Access
    Temporary materials: comparison of in vivo and in vitro performance
    (2020-06-01T00:00:00Z) Sari, Tugrul; Usumez, Aslihan; Strasser, Thomas; ŞAHİNBAŞ, ABDURRAHMAN; Rosentritt, Martin; ŞAHİNBAŞ, ABDURRAHMAN
    Objective The aim of this investigation was to compare clinical performance and in vitro wear of temporary CAD/CAM and cartridge crowns. This study is an approach to estimate the influence of in vivo use and laboratory simulation on temporary crowns. Materials and methods A total of 90 crowns were fabricated from each temporary CAD/CAM or cartridge material. Also, 10 crowns of each material were clinically applied for 14 days, and 80 identical duplicate restorations were investigated in the laboratory after storage in water (14 days; 37 degrees C) and subsequent thermal cycling and mechanical loading (TCML, 240.000 x 50N ML, 600 x 5 degrees C/55 degrees C). After in vivo application or in vitro aging, facture force, superficial wear (mean and maximum), surface roughness (Ra, Rz), thermal weight loss (TGA), and heat of reaction (DSC) were determined for all crowns. Statistics: Bonferroni post hoc test; one-way analysis of variance (ANOVA);alpha = 0.05). Results The fracture resistance of the temporary materials varied between 1196.4 (CAD in vivo) and 1598.3 N (cartridge crown in vitro). Mean (maximum) wear data between 204.7 (386.7 mu m; cartridge in vitro) and 353.0 mu m (621.8 mu m; CAD in vitro) were found. Ra values ranged between 4.4 and 4.9 mu m and Rz values between 36.0 and 40.8 mu m. DSC and TG analysis revealed small differences between the materials but a strong influence of the aging process. Conclusions Comparison of in vivo and in vitro aging led to no significant differences in fracture force and wear but differences in roughness, DSC, and TGA. SEM evaluation confirmed comparability. Comparison of CAD/CAM and cartridge temporary materials partially showed significant differences.
  • PublicationMetadata only
    (2019-09-06T00:00:00Z) Şahinbaş, Abdurrahman; Burduroğlu, Hatice Defne; ŞAHİNBAŞ, ABDURRAHMAN; BURDUROĞLU, HATİCE DEFNE
    Keywords: 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.
  • PublicationMetadata only
    Chairside Restoration of a Broken Central Incisor
    (2018-05-10T00:00:00Z) Taha, Esad; Burduroğlu, Hatice Defne; Şahinbaş, Abdurrahman; BURDUROĞLU, HATİCE DEFNE; ŞAHİNBAŞ, ABDURRAHMAN
  • PublicationMetadata only
    Effect of Different Restorative Materials on Primary Tooth Wear: A Quantitative Evaluation Using Microcomputed Tomography
    Purpose: The wear properties of o five materials used in the primary dentition must be compatible with primary tooth wear. The purpose of this study was to investigate the wear rate of primary teeth opposing composite resin and different prefabricated crown materials. Methods: The study specimens were divided into four groups: (1) composite resin (CR) group; (2) stainless steel group (5.5); (3) monolithic zirconia (MZ) group; and (4) fiberglass (FG) group. Ten specimens were prepared from each group, and primary canines were used as antagonist teeth. The wear test was conducted with a vertical loud of 50 N and 240,000 cycles using a chewing simulator. The volume losses of antagonist teeth and the weight losses of restorative materials were calculated with microcomputed tomography and a digital scale, respectively. The worn surfaces of restorative materials were examined via scanning electron microscopy. Results: The amount of enamel wear was highest in the MZ group (1.551 +/- 0.859 [standard deviation] mm(3)) group, followed by the FG group (1.028 +/- 0.854 mm(3)), SS group (0.480 +/- 0324 mm(3)), and CR group (0310 +/- 0341 mm(3)). The volume losses in the MZ group were significantly greater than those in the SS and CR groups (P<0.05). The weight loss amount of restorative materials was highest in the CR group (81.2 mg), followed by the FG (6 +/- 3 mg), SS (4 +/- 3 mg), and MZ (2 +/- 1 mg) groups. Conclusions: Prefabricated monolithic zirconia crowns caused greater wear on opposing primary teeth. The amount of weight loss in the composite resins was highest while causing minor primary tooth wear.
  • PublicationMetadata 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, ABDURRAHMAN
    Service 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.
  • PublicationMetadata only
    Fiberle Güçlendirilmiş Rezin Altyapi Materyalinin Tam Seramik Kronlarin Dayanimina Etkisi
    (2018-09-30) ŞAHİNBAŞ, ABDURRAHMAN; Eskitaşçıoğlu, Gürcan; ŞAHİNBAŞ, ABDURRAHMAN
  • PublicationMetadata 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 DEFNE
  • PublicationMetadata only
    An Overdenture Treatment of a Young Patient: A Case Report
    (2019-09-06T00:00:00Z) Arslan, Emel; Şahinbaş, Abdurrahman; ŞAHİNBAŞ, ABDURRAHMAN
  • PublicationMetadata 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