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Öğe Adhesion of orthodontic braces to different restorative materials: influence of surface conditioning methods(AVES, 2023) Turunç-Oğuzman, Rana; Şişmanoğlu, SonerObjective: The purpose of this study was to analyze the shear bond strength of orthodontic metal braces to restorative materials with various constituents and manufacturing methods after different surface conditioning methods. Methods: The samples were prepared from Vita Mark II, Shofu Block HC, Brilliant Crios computer-aided design/computer-aided manufacturing blocks, and Gradia Direct composite restorative material, and they were exposed to 5000 thermal cycles. Fabricated samples were divided into 6 groups based on the surface conditioning method (n = 12): control (no conditioning); etching with hydrofluoric acid; sandblasting with aluminum oxide; tribochemical silica coating with CoJet sand; bur abrasion; Monobond Etch and Prime application. The surface characteristics of the restorative materials were analyzed with a scanning electron microscope. The universal adhesive was applied to the specimens, and orthodontic braces were bonded with a light-cure adhesive paste. After thermal cycling, shear bond strength values were measured, and the adhesive remnant index was recorded. Two-way analysis of variance and Tukey tests were used for statistical analysis. Results: Both the surface conditioning method and the material type significantly affected shear bond strength values. In addition, the interaction between these variables was significant (P < .001). Control groups of all restorative materials had significantly the lowest shear bond strength values. Conclusion: Surface conditioning methods significantly enhanced the shear bond strength. Control groups of Vita Mark II and Shofu Block HC demonstrated shear bond strength values lower than the acceptable limit, but the rest of the groups showed adequate adhesion (above 6 MPa). Consequently, clinicians can prefer Monobond Etch and Prime along with a universal adhesive as a safer surface conditioning method.Öğe Adhesive performance of resin cement to glass-ceramic and polymer-based ceramic CAD/CAM materials after applying self-etching ceramic primer or different surface treatments(2023) Oğuzman, Rana Turunç; Şişmanoğlu, SonerEnsuring optimum bond strength during cementation is vital for restoration success, with the practicality of the process being crucial in clinical practice. This study analyzed the effect of a single-step self-etching ceramic primer (MEP) and various surface treatments on the microshear bond strength (µSBS) between resin cement and glass-ceramic or polymer-based ceramic CAD/CAM materials. Specimens were fabricated from leucite-based glass-ceramic (LEU), lithium disilicate glass-ceramic (LDC), resin nanoceramic (RNC), and polymer infiltrated ceramic network (PICN) (n = 160). They were then classified based on the surface treatments (n = 10): control (no treatment); sandblasting with Al2O3 (AL); etching with hydrofluoric acid (HF); and MEP application. Scanning electron microscopy was used to evaluate the surface topography. µSBS was measured after cementation and thermocycling procedures. Failure modes were examined with a stereomicroscope. Statistical analysis involved two-way analysis of variance and Tukey HSD tests with a significance level of 0.05. µSBS was significantly influenced by both surface treatment and CAD/CAM material type. The most enhanced µSBS values for each material, regarding the surface treatment, were: LEU and LDC, HF; RNC, AL; PICN, AL or HF. MEP significantly increased the µSBS values of CAD/CAM materials except RNC, yet it did not yield the highest µSBS values for any of them.Öğe An overview of vital tooth bleaching(Altınbaş Üniversitesi, 2020) Şişmanoğlu, SonerBleaching of tooth discolorations became more attractive with the increasing importance of aesthetics. Therefore, in recent years, bleaching treatment has become one of the fastest-growing parts of aesthetic dentistry. Bleaching can generally be carried out with hydrogen peroxide or carbamide peroxide both at-home and in-office. Bleaching systems have been offered to the public as a more conservative and economical approach for improving dental appearance. However, the dental profession should maintain high ethical standards and not recommend cosmetic adjustments to the tooth color to suit the patient’s demand. Therefore, in this article, vital tooth whitening applications are discussed.Öğe Bleaching of nonvital teeth: A review(Altınbaş Üniversitesi, 2020) Şişmanoğlu, SonerThe teeth frequently become discolored in time due to the endodontic treatment residues in the pulp chamber or hemolytic products accumulated in the dentine tubules after trauma. This condition may cause psychosocial problems for patients. Nonvital bleaching has gained popularity due to its conservative nature and low cost to overcome this unpleasant condition. This article will give an overview of nonvital bleaching techniques, materials and regimens used, bleaching procedure and side-effects.Öğe Bond durability of contemporary universal adhesives: Effect of dentin treatments and aging(Taylor & Francis Ltd, 2019) Şişmanoğlu, SonerThe aim of this in vitro investigation was to evaluate the effects of different dentin treatments on mu TBS values of three different universal adhesives. Sixty extracted bovine incisors were used. The teeth were horizontally sectioned from the enamel-cement junction and embedded in an acrylic resin. Enamel was removed with 180-grit SiC paper to expose dentin. The exposed dentin surfaces were further polished with 600-grit SiC paper to provide a standardized smear layer. Teeth were randomly divided into three groups, according to the universal adhesives: All-Bond Universal, Single Bond Universal, and G-Bond Plus. Each group was then assigned into four subgroups, according to the dentin treatments: etch-and-rinse mode (ER), ER + 2% chlorhexidine (CHX), ER + %2.5 genipin (GE), and self-etch mode (SE). Samples were longitudinally sectioned across the bonded-interfaces to obtain resin-dentin beams. Beams were prepared from the same teeth were randomly and equally divided into two groups: immediate mu TBS testing and mu TBS testing after 6-month. The failure loads were recorded in MPa, and failure modes were evaluated at 30x magnification. The data were analyzed using a two-way ANOVA, to determine the effects of dentin treatment and storage time, and the interaction of these two factors on the mu TBS of universal adhesives. Dentin treatments were showed significant differences (p<0.05). ER mode exhibited higher mu TBS than SE mode. However, universal adhesives were more durable in the SE mode than ER mode. Also, chlorhexidine treatment significantly improved adhesive performance of all universal adhesives, while no significant improvement was detected with genipin treatment.Öğe Comparison between tensile characteristics of various suture materials with two suture techniques: An in vitro study(Springer Heidelberg, 2021) Taysi, Ayşegül Erten; Ercal, Pınar; Şişmanoğlu, SonerObjective The first objective of the present study was to evaluate the tensile strength and elongation to failure of commonly used suture materials in oral surgery. As a secondary objective, it was aimed to make a comparison between two different suture techniques within the same suture materials. Materials and methods Eight different suture materials with 3-0 gauge (silk, polytetrafluoroethylene, polypropylene, polyester, polyglactin 910, polyglycolic acid, poliglecaprone 25, polydioxanone) underwent tensile testing for maximum load of failure and elongation rate. All strands were tied by one investigator on the experimental platform using the surgeon's knot plus additional square knots in both simple suture and horizontal mattress suture techniques. Prepared specimens were examined using a microtensile testing device before (baseline) and after 3, 7, and 14 days' immersion in artificial saliva. Results Statistical analysis of the current study revealed that the tensile strength for polyglycolic acid, polyglactin 910, polypropylene, and silk sutures was significantly lower at day 3 than at the baseline. By day 14, polyglycolic acid and polyglactin 910 showed a significant reduction in tensile strength for both techniques. While polydioxanone obtained the highest tensile strength and elongation values in both techniques, polytetrafluoroethylene showed the most stable tensile strength even with the lowest value. Tensile strength in simple suture techniques was almost twice than that of horizontal mattress suture technique for each specimen. Conclusions Polyglycolic acid and polyglactin 910 were considerably sensitive to immersion time. Polydioxanone demonstrated optimum performance during each immersion period among the tested materials, whereas polytetrafluoroethylene was the most stable.Öğe Cytotoxic effects of different self-adhesive resin cements: Cell viability and induction of apoptosis(Korean Acad Prosthodontics, 2020) Şişmanoğlu, Soner; Demirci, Mustafa; Schweikl, Helmut; Özen-Eroğlu, Güneş; Çetin-Aktaş, Esin; Kuruca, Serap; Tekce, NeslihanPURPOSE. The effects of four different self-adhesive resin cement materials on cell viability and apoptosis after direct and indirect exposure were evaluated using different cell culture techniques. MATERIALS AND METHODS. Self-adhesive cements were applied to NIH/3T3 mouse fibroblasts by the extract test method, cell culture inserts, and dentin barrier test method. After exposure periods of 24 h and 72 h, the cytotoxicity of these self-adhesive materials was evaluated using the MTT assay (viability) and the Annexin-V-FITC/P1 staining (apoptosis). RESULTS. The lowest cell viability was found in cells exposed to BeautiCem SA for 24 h in the extract test method. Cell viability was reduced to 70.6% compared to negative controls. After the 72 h exposure period, viability rate of cell cultures exposed to BeautiCem SA decreased more than 2- fold (29.5%) while cells exposed to RelyX U200 showed the highest viability rate of 71.4%. In the dentin barrier test method, BeautiCem SA induced the highest number of cells in apoptosis after a 24 h exposure (4.1%). Panavia SA Cement Plus was the material that caused the lowest number of cells in apoptosis (1.5%). CONCLUSION. The used self-adhesive cements have showed different cytotoxic effects based on the evaluation method. As exposure time increased, the materials showed more cytotoxic and apoptotic effects. BeautiCem SA caused significantly more severe cytotoxic and apoptotic effects than other cements tested. Moreover, cements other than BeautiCem SA have caused necrotic cell death rather than apoptotic cell death.Öğe Diş Hekimliği’nde Lokal Anestezi Eğitimine ve Anestezi İleti Modelinin Verimliliğine Yönelik Öğrenci Fikirlerinin Analizi(2023) Erten Tayşi, Ayşegül; Tayşi, Nuri Mert; Erçal, Pınar; Coşkun, Ümmügülsüm; Dinç, Uğur Alp; Yılmaz Altıntaş, Nuray; Şişmanoğlu, SonerAmaç: Çalışmanın amacı fantom model olarak Anestezi İletim Modeli üzerinde verilen eğitimin etkililiğini ve diş hekimliği öğrencilerinin lokal anestezi eğitimine olan talep ve algılarını değerlendirmektir. Gereç ve Yöntem: Bu çalışmada, hasta başında en az 1 kez lokal anestezi uygulaması gerçekleştirmiş olan Diş Hekimli- ği Fakültesi öğrencilerine manuel olarak cevaplandırdıkları 14 soruluk anket yapılmış ve toplam 123 tam yanıt alınmıştır. Fantom model üzerinde çalışan ve çalışmayan gruplar için de- ğişkenlere yönelik yüzde dağılımları incelenmiştir. Grup farklı- lıkları analizinde 2 grup karşılaştırmalarında Mann-Whitney-U testi, 3 ve üzeri grup karşılaştırmalarında Kruskal-Wallis test kullanılmıştır. Anlamlılık düzeyi p < 0,05 olarak alınmıştır. Bulgular: Fantom model üzerinde çalışan öğrenciler istatis- tiksel olarak anlamlı olacak şekilde pratik açıdan daha yeterli eğitildiklerini düşünmektedir (p = 0.036). Fantom model üze- rinde çalışan ve çalışmayan öğrencilerin hasta başında ilk anestezilerini yaptıkları andaki korku seviyeleri arasında ista- tistiksel olarak anlamlı bir farklılık bulunmamıştır (p = 0.070). Fantom model üzerinde çalışan öğrenciler kendilerine en az güvendikleri anestezi tekniği olarak tüber anesteziyi belirtir- ken, fantom model üzerinde çalışmayan öğrenciler için bu teknik inferior alveolar sinir anestezi olmuştur. Öğrenciler has- ta başında anestezi uygulamaya başladıklarında kendilerini en çok yetersiz hissettikleri alanları sırasıyla anatomi, komp- likasyon yönetimi, farmakoloji, hasta iletişimi ve yasal yönler olarak belirtmiştir. Fantom model üzerinde çalışmayan öğren- ciler kendilerini yasal yönlerden istatistiksel olarak anlamlı ola- cak şekilde daha yetersiz hissetmektedir (p = 0.034). Sonuç: Eğitimde öğrenci görüşlerini öğrenmek dersin gelişti- rilmesi açısından önem taşımaktadır. Fantom model üzerinde çalışmanın öğrencilerin başarısına olan katkısı bilinmese de öğrencilerin eğitim algılarına pozitif yönde etki ettiği görül- müştür.Öğe Does knot configuration improve tensile characteristics of monofilament suture materials?(2022) Erten Tayşi, Ayşegül; Tayşi, Nuri Mert; Şişmanoğlu, SonerPurpose: The effects of knot configuration used in surgical procedures are often overlooked when surgeons are looking for an ideal suture material. This study aimed to investigate the mechanical properties of monofilament suture materials used in oral and maxillofacial surgery under diverse knot configurations. Materials and methods: A custom-made experimental platform and a microtensile test device were used to evaluate the mechanical properties of the tested subjects. There were 2 predictor variables: suture material and knot configuration. Three types of nonabsorbable and monofilament suture materials with 4-0 gauge, including nylon, polypropylene, and polytetrafluoroethylene, were tested. Four different knot configurations-a surgeon's knot square plus a square knot (2 = 1 = 1), a surgeon's knot granny plus a square knot (2 × 1 = 1), a reverse surgeon's knot granny plus a square knot (1 × 2 = 1), and a reverse surgeon's knot square plus a square knot (1 = 2 = 1)-were also used with each of the suture materials. The tensile strength (N) and elongation (μm) of each sample were measured as the outcomes. The data were statistically analyzed using 2-way analysis of variance and Tukey's honestly significant difference tests. The significance level was set at P < .05. Results: Overall, 120 samples were tested. Statistical analysis revealed that the highest tensile strength (28.6 N) was found for nylon in the surgeon's knot square plus a square knot (P < .05). Polypropylene showed a similar high tensile strength value (24.7 N) in the reverse surgeon's knot granny plus a square knot (P > .05). Polytetrafluoroethylene demonstrated significantly lower values for both tensile strength in tested configurations (within the range of 5.2-8.5 N). Under diverse configurations, polypropylene suture samples offered the most stable tensile strength and elongation. Conclusions: The present study demonstrated that different knot configurations might improve the mechanical profile of commonly used monofilament suture materials. The surgeon's knot square (2 = 1), commonly used by surgeons worldwide, proved to be the most beneficial knot configuration in this study in terms of tensile strength and elongation. Further research on optimal knot configuration may be just as important as seeking an ideal suture material.Öğe Effect of different surface treatments on the repair of aged bulk-fill composites: An in vitro study(Cumhuriyet University Faculty of Dentistry, 2019) Şişmanoğlu, SonerObjectives: The aim of this in vitro study was to evaluate the efficiency of different surface treatments on the microtensile bond strength (?TBS) of aged bulk-fill composite. Materials and Methods: Sixty bulk-fill resin-based composite (RBC) specimens in 5 x 5 x 5 dimensions were prepared. After the aging by thermal cycling for 5000 times between 5 and 55°C, substrate surfaces were abraded with SiC abrasive papers. Specimens were divided into 6 groups according to the surface treatment protocol: no surface treatment (control), control + Single Bond Universal (SBU; 3M ESPE) application, phosphoric acid etching (PA) + SBU, hydrofluoric acid etching (HF) + SBU, aluminum oxide air abrasion (AlO) + SBU, and tribochemical silica coating (TSC) + SBU. Surface roughness values were measured in five different directions using a contact profilometer (n=10). Then, specimens were repaired with a conventional RBC. After the repair, bonded specimens were cut into 1 mm2 beams and ?TBS values were determined until failure at a crosshead speed of 0.5 mm/min. Specimen surfaces after surface treatments were observed by SEM. Data were analyzed using ANOVA and Tukey tests (p<0.05). Results: One-way ANOVA revealed significant difference (p<0.001) among the surface treatments. The lowest repair ?TBS values were observed for the control group. SBU application alone significantly improved repair ?TBS values (p<0.001). The highest ?TBS values were obtained for the AlO and TSC, and HF followed. The surface roughness ranking for the five surface treatment protocols was as follows: TSC > AlO > HF > PA = Control. Conclusions: Aged bulk-fill RBCs can be successfully repaired if effective and safe repair protocol is chosen. The highest ?TBS values were obtained for the AlO and TSC. The use of universal adhesive alone is promising to facilitate the repair of bulk-fill RBCs. © 2019 Cumhuriyet University Faculty of Dentistry.Öğe Effect of polishing systems on fluoride release and surface roughness of different restorative materials(Univ Costa Rica, Fac Odontologia, 2020) Şişmanoğlu, Soner; Gümüştaş, Burak; Yıldırım-Bilmez, ZuhalSecondary caries is an important factor in the replacement of the restorations, and it is thought that fluoride-releasing materials may prevent this problem. Furthermore, the fluoride release of the materials may be increased by polishing process. Available knowledge about the effect of polishing systems (PS) on the fluoride release of materials is limited. Therefore, this study was conducted to evaluate the effect of PS on the fluoride release of fluoride-containing materials. Restorative materials were divided into 6 groups: Fuji IX GP, Fuji II, Dyract XP, Beautifil II, Beautifil-Bulk, and Filtek Ultimate. Each group was also divided into four subgroups: Mylar strip, Sof-Lex Discs, Sof-Lex Diamond, and OneGloss. Fluoride release was determined using a fluoride ion-selective electrode. Surface roughness was evaluated with a profilometer. Two-way repeated measure and one- way ANOVA tests were used for statistical analysis. The initial rapid fluoride release was observed only in Fuji IX. The PS increased the fluoride release of Fuji IX and Fuji II and Dyract XP materials while reducing the fluoride release of resin-based materials. The highest surface roughness values were obtained with OneGloss. Further, a significant relationship between fluoride release and surface roughness was found. The polishing provides an increase in fluoride release, especially in glass-ionomer- based materials. This article revealed that there is a relationship between fluoride release and surface roughness. Proper PS must be chosen according to the material to provide the best clinical benefits in terms of fluoride release and surface roughness.Öğe Effect of surface treatments and universal adhesive application on the microshear bond strength of CAD/CAM materials(Korean Acad Prosthodontics, 2020) Şişmanoğlu, Soner; Gürcan, Aliye Tuğçe; Yıldırım-Bilmez, Zuhal; Turunç-Oğuzman, Rana; Gümüştaş, BurakPURPOSE. The aim of this study was to evaluate the microshear bond strength (mu SBS) of four computer-aided design/computer-aided manufacturing (CAD/CAM) blocks repaired with composite resin using three different surface treatment protocols. MATERIALS AND METHODS. Four different CAD/CAM blocks were used in this study: (1) flexible hybrid ceramic (FHC), (2) resin nanoceramic (RNC), (c) polymer infiltrated ceramic network (PICN) and (4) feldspar ceramic (FC). All groups were further divided into four subgroups according to surface treatment: control, hydrofluoric acid etching (HF), air-borne particle abrasion with aluminum oxide (AlO), and tribochemical silica coating (TSC). After surface treatments, silane was applied to half of the specimens. Then, a silane-containing universal adhesive was applied, and specimens were repaired with a composite, Next, mu SBS test was performed. Additional specimens were examined with a contact profilometer and scanning electron microscopy. The data were analyzed with ANOVA and Tukey tests. RESULTS. The findings revealed that silane application yielded higher mu SBS values (P<.05). All surface treatments were showed a significant increase in mu SBS values compared to the control (P<.05). For FHC and RNC, the most influential treatments were AlO and TSC (P<.05). CONCLUSION. Surface treatment is mandatory when the silane is not preferred, but the best bond strength values were obtained with the combination of surface treatment and silane application. HF provides improved bond strength when the ceramic content of material increases, whereas AlO and TSC gives improved bond strength when the composite content of material increases.Öğe Effect of surface treatments on shear bond strength between CAD/CAM bioceramic and resin blocks and orthodontic metal brackets bonded to each other(Springer, 2022) Turunç-Oğuzman, Rana; Şişmanoğlu, SonerThis in vitro study aimed to evaluate shear bond strength (SBS) between CAD/CAM blocks with different compositions and orthodontic metal brackets, following various surface treatments and bonding procedure. Specimens were prepared from Vita Enamic, CeraSmart, Tetric CAD and Vita Mark II CAD/CAM blocks and were subjected to thermocycling for 5000 cycles. Then, the specimens were allocated into 6 groups according to the surface treatment (n = 12): control (no surface treatment); hydrofluoric acid etching (HF); air-borne particle abrasion with aluminium-oxide; tribochemical silica coating; bur abrasion; and Monobond Etch and Prime application (MEP). The surface morphology of the CAD/CAM blocks was characterized using scanning electron microscope. Then, specimens were silanized and brackets were bonded with adhesive resin. After thermocycling, the SBS test was performed until failure, and failure types were noted according to the adhesive remnant index (ARI). Data were analysed using two-way ANOVA and Tukey tests to perform pairwise analyses. The significance level was taken as α = 0.05. Both the CAD/CAM block type and the surface treatment significantly influenced SBS. Control groups of all CAD/CAM blocks demonstrated significantly the lowest SBS values. The highest SBS values were observed for Vita Mark II specimens treated with HF among all groups. Control groups showed exclusively ARI score 5, whereas surface treated groups had lower and similar scores. All groups, except the control, had reliable SBS values (above 6 MPa). Therefore, clinicians can use MEP, novel self-etching single-component ceramic primer, safely besides other surface treatments while bonding orthodontic brackets.Öğe Effects of acidic beverages on color stability of bulk-fill composites with different viscosities(2022) Şişmanoğlu, Soner; Sengez, GörkemThe aim of this in vitro study is to investigate the effects of acidic beverages on the discoloration of bulk-fill composites with different viscosities. 144 disc-shaped specimens (8mm diameter × 2mm thick) were prepared from four different composite resins including a nanohybrid (Filtek Ultimate), two packable bulk-fill (Filtek Bulk Fill, Tetric N Ceram Bulk Fill), and a flowable bulk-fill composite (Tetric N Flow Bulk Fill). The specimens of each group were divided into 3 subgroups and submerged in distilled water, orange juice and coke (n=12). Color difference (ΔE) were measured using CIELab color space and a compact spectrophotometer (VITA Easyshade) at baseline and after 30 days of immersion. Data were analyzed using two-way ANOVA and Tukey's HSD post-hoc tests (P<0.05). Two-way ANOVA revealed that both material type and staining solution significantly influenced ΔE values (P<0.001). Immersion in orange juice resulted in greater and significant discoloration over time in comparison to distilled water and coke (P[removed]2.7) was observed for all bulk-fill composites tested. It can be speculated that orange juice has a more negative effect on the color stability compared to coke. Additionally, flowable bulk-fill composite was more prone to discoloration than condensable bulk-fill composites.Öğe Effects of calcium silicate-based cements on odonto/ osteogenic differentiation potential in mesenchymal stem cells(Australian Endodontic Journal, 2022) Ercal, Pınar; Şişmanoğlu, SonerThe objective of this study was to evaluate the biological effects and odonto/osteogenic differentiation potential of Biodentine, NeoMTA Plus and TheraCal LC in tooth germ-derived stem cells(TGSCs). TGSCs were exposed to the material extracts. Biocompatibility was tested with MTS cell proliferation assay. Odonto/osteogenic differentiation was assessed with alkaline phosphatase (ALP) activity and mRNA gene expressions (RUNX2, DSPP and DMP-1). Scanning electronic microscopy/ energy-dispersive X-ray (SEM/EDX) analysis and pH analysis were also performed for the materials. Data were evaluated using the one-way ANOVA and Tukey's tests. TGSCs remained viable after 7 days of incubation with all tested materials. Biodentine and NeoMTA Plus showed high ALP activity and increased expression of RUNX2, DSPP and DMP-1 compared to that of TheraCal LC. All materials can induce odonto/osteogenic differentiation of MSCs in various levels. Biocompatibility and odonto/osteogenic differentiation potential of Biodentine and NeoMTA Plus are similar and superior to that of TheraCal LC.Öğe Efficacy of different surface treatments and universal adhesives on the microtensile bond strength of bulk-fill composite repair(Taylor & Francis Ltd, 2020) Şişmanoğlu, Soner; Gürcan, Aliye Tuğçe; Yıldırım-Bilmez, Zuhal; Gümüştaş, BurakThe purpose of this in vitro study was to evaluate the influence of different surface treatments and aging on the microtensile bond strength (mu TBS) of bulk-fill composite resins. Bulk-fill composites (Filtek One; 3M ESPE) randomly received five different surface treatments: (1) no treatment, control, (2) 37% phosphoric acid etching (PA), (3) 9% hydrofluoric acid etching (HF), (4) air-borne particle abrasion with 50-mu m alumina particles (Al2O3), (5) tribochemical silica coating (CoJet). Following, the specimens were divided into three subgroups according to universal adhesive applied: Clearfil Universal Bond (CU; Kuraray), Prime&Bond Universal (PBU; Dentsply Sirona), or Single Bond Universal (SBU; 3M ESPE). A nanofill composite (Filtek Ultimate; 3M ESPE) was employed as a repair. Bonded specimens were stored in water for 24 h at 37 degrees C or thermal aged, then subjected to the mu TBS test. Additionally, specimens were analyzed with a contact profilometer and were evaluated with scanning electron microscopy. Control and PA treatments were showed the lowest mu TBS (p < 0.05), and there was no significant difference between these two groups (p > 0.05). Al2O3 and CoJet treatments generally exhibited a similar influence on mu TBS values. In addition, a correlation was found between surface roughness and bond strength (r = 0.831). CoJet resulted in significantly higher repair mu TBS values when compared to the other surface treatments. In addition, the use of silane-containing universal adhesive was increased the cohesive failure rate and maintained the repair mu TBS values after thermocycling.Öğe Efficiency of self-adhering flowable resin composite and different surface treatments in composite repair using a universal adhesive(Wolters Kluwer Medknow Publications, 2019) Şişmanoğlu, SonerAims: The aim of this in vitro investigation was to evaluate the efficiency of self-adhering flowable resin composite (Vertise Flow, Kerr, Orange, CA, USA) and different surface treatments in the repair microtensile bond strength (mu TBS) of aged nanofill resin composites using a universal adhesive. Materials and Methods: Aged substrates (x5000 thermocycling) were prepared using a nanofill (Filtek Ultimate; 3M ESPE) resin composite and randomly assigned to different surface treatments: (1) no treatment (control), (2) acid etching with 37% phosphoric acid, (3) Al(2)O(3)sandblasting, and (4) sandblasting with CoJet (3M ESPE). After surface treatment, specimens were further divided into two groups: no universal adhesive application and universal adhesive application. Vertise Flow was added to the substrates at 2-mm layer increments to a height of 5 mm and light cured. Restored specimens were sectioned to obtain 1.0-mm(2) beams for mu TBS testing. Data were analyzed with two-way analysis of variance and Tukey's honest significant difference tests (P < 0.05). Results: The lowest mu TBS values were recorded in the control and acid etching groups with no universal adhesive application (P < 0.05). Universal adhesive application significantly increased the repair mu TBS values of all surface treatments (P < 0.05), except CoJet treatment. There were no significant differences between Al(2)O(3)sandblasting, CoJet application, and acid etching groups with the universal adhesive application (P > 0.05). Conclusion: Vertise Flow can be used effectively in the repair of old nanofill resin composites. The usage of universal adhesive with prior acid etching to obtain acceptable repair performance would be the practical choice under clinical conditions.Öğe Evaluation of tensile strength of sutures used in dentistry(2023) Ercal, Pınar; Tayşi, Ayşegül Erten; Tayşi, Mert; Şişmanoğlu, SonerAim: The aim of this study was to compare the mechanical properties of sutures used in dentistry according to different materials in vitro. Material and Methods: Eight 3-0 different absorbable and non-absorbable suture materials with 3-0 gauge (Polytetraflouroethylene, polypropylene, polyester, polyglactin 910, polyglycolic acid, poliglecaprone 25, polydioxanone, and silk) were compared in terms of mechanical strength. All sutures were tied with a simple suture technique. Each material contained 10 samples per group, with a total sample size of 80 specimens. Failure load was measured in N while elongation was measured in µm using a microtensile testing device. A one-way analysis of variance (ANOVA) was used to analyze the difference in failure loads and elongation values. Results: Polydioxanone was significantly more resistant to tensile forces among all tested materials (p<0.001) which was followed by poliglecaprone 25, whereas polyglactin 910 presented the lowest failure load values. Although there was no direct relationship between tensile strength and elongation values of the materials, polydioxanone demonstrated increased elongation before failure. Additionally, polyglactin 910 indicated a significantly lower elongation capacity among all tested materials. Conclusion: Failure load and elongation were dependent on the suture material type. Where high tensile strength is required, polydioxanone is an advantageous material due to its high resistance to loads and better elongation characteristics.Öğe Evaluation of the efficacy of a simulation model used in oral and maxillofacial surgery education(2024) Erten Taysi, Ayşegül; Taysi, Nuri Mert; Şişmanoğlu, SonerBackground: The traditional teaching methods of dental education are gradually being replaced with futuristic education methods based on the usage of educational tools such as mannequin-based simulation models and virtual reality. However, the effectiveness of mannequin-based simulation models as a learning method in the field of oral surgery remains unclear. This study aims to investigate the efficacy of training on a tooth extraction model (TEM) in view of undergraduate dental students' experience and perception of their education. Methods: A quasi-experimental trial was implemented with two consecutive year classes, totaling 136 students at the Dentistry Faculty of Altinbas University, Turkiye. Two cohorts were created from dental students in the classes of 2023 and 2022 graduates. Cohort 1 (n = 71) received 14 h of theoretical education followed by 10 h of preclinical education on TEM. Cohort 2 (n = 65) received only 14 h of theoretical education. An anonymous questionnaire was prepared with four main sections including the preferences of learning style, participants' perceptions of the preclinical training methods, the students' competency and free text comments. Students' opinions were quantified with both 7-point Likert scales and thematic analysis. Anxiety levels were measured with the interval scale of anxiety response (ISAR). Descriptive statistics, inferential statistical and thematic analyses were conducted according to survey responses. Student characteristics were summarized and compared for two cohorts using a t-test. For all statistical analyses, the significance level was set atP ≤ 0.05. Result: Cohort 1 was more comfortable with sequential motions performed with the forceps (P = 0.033) and felt more ready for their first clinical tooth extraction experience (P = 0.028). Cohort 2 showed a significantly higher preference for textbooks among supplementary materials (P = 0.04); however, they tended to exhibit lower self-confidence and higher anxiety levels, though without any statistical significance (P > 0.05). Conclusion: It is clear that the students who have yet to start seeing patients benefit from increased practice with training models, which adequately reflect and represent real-life situations encountered in everyday practice.Öğe Fluoride release of giomer and resin based fissure sealants(Univ Costa Rica, Fac Odontologia, 2019) Şişmanoğlu, SonerFissure sealants are applied to teeth to prevent caries development. The presence of the fissure sealant creates a protective barrier, which prevents plaque accumulation to the pits and fissure. They have a significant role in preventing pit and fissure caries. The aim of this study was to evaluate the time-dependent fluoride ion release of giomer- and resin-based fissure sealants. Fissure sealants were divided into 4 groups: BeautiSealant (Shofu, Japan), Clinpro Sealant (3M ESPE, USA), Helioseal F (Ivoclar Vivadent, Liechtenstein), Fissurit F (Voco, Germany). Disk shaped samples were prepared for each sealant material tested, and they were transferred into polyethylene vials containing 5 ml of deionized water. Fluoride ion diffusion was determined on days 1,2,3,7,14,21, and 28 (n=7). The fluoride concentration in these samples was analyzed using a pre-calibrated spectrophotometer in parts per million (ppm). These experiments were performed in triplicates at room temperature. ANOVA and Tukey's HSD test were used for statistical analysis. BeautiSealant was released the highest amount of fluoride on day 1 (5.33 ppm), followed by a sudden decrease on the day 2 (2.17 ppm). The burst effect was observed only in this group. Clinpro Sealant, Fissurit F and HelioSeal F groups presented fluoride release of 2.69, 2.94 and 2.91 ppm on the first day, respectively, without a significant difference (p>0.05). After the first week, a constant fluoride release level has been reached. The fluoride release for the three resin-based fissure sealants was slightly lower than that for the giomer-based. After the first week, materials exhibited no significant difference and reached a plateau. The usage of a high and prolonged fluoride-releasing fissure sealant material should be considered by clinicians, particularly in patients with caries risk.
