Yazar "Çelik, Çiğdem" seçeneğine göre listele

Listeleniyor 1 - 8 / 8
  • [ X ]
    Öğe
    Biyoaktif kompozit rezinler
    (2021) Özdemir, Behiye Esra; Çelik, Çiğdem
    Günümüzde, kompozit rezinler, estetik özellikleri nedeniyle yaygın olarak kullanılan restoratif materyallerdir. Bununla birlikte; polimerizasyon büzülmesi, kenar sızıntısı, renklenme ve sekonder çürük, kompozit rezinlerin en önemli başarısızlık sebepleri arasında yer almaktadır. Bu olumsuzlukların üstesinden gelmek için, remineralizasyon potansiyeline sahip, antimikrobiyal maddeler içeren yeni bioaktif materyallerin geliştirilmesiyle ilgili pek çok çalışma yapılmaktadır. Bu araştırmalar, demineralizasyonun azaltılması, sekonder çürüklerin engellenmesi, asitlerin nötralize edilmesi, biyofilm oluşumu ve asit üretiminin baskılanması, tersiyer dentin oluşumunun sağlanması ve pulpanın korunması konusunda umut verici sonuçlara sahiptir.
  • [ X ]
    Öğe
    Effect of laser-assisted retrograde cavity preparation on push-out-bond-strength of mineral trioxide aggregate and calcium-enriched-mixture-cement
    (Universidade Estadual Paulista, Institute of Science and Technology of Sao Jose dos Campos, 2022) Bahadir, Hasibe Sevilay; Türkyilmaz, Ali; Bayraktar, Yusuf; Çelik, Çiğdem
    Objective: This study aimed to determine the push-out-bond-strength(PBS) of mineral trioxide aggregate (BIOMTA+) and calcium-enriched-mixture-cement (CEM) in retrograde cavities prepared using Er: YAG laser and stainless-steel bur. Material and Methods: The root canals of 60 extracted single-rooted human teeth were prepared, filled and their apical portion of 3-mm were resected using a diamond bur and randomly divided into four groups according to technique of retrograde preparation and filling material as follows(n=15): Group1: bur/ BIOMTA+,Group2: bur/ CEM, Group3: Er:YAG laser/ BIOMTA+, Group4: Er:YAG laser/ CEM. PBS test were performed to specimens and failure modes were evaluated. The data were statistically analyzed with ANOVA, Post-Hoc Tukey and t tests (p< 0.05). Results: CEM was exhibited higher than bond strength compared to BIOMTA+ in retrograde cavity prepared using laser (p= 0.021) and BIOMTA+ in retrograde cavity prepared using bur was exhibited higher than bond strength compared to in retrograde cavities prepared using laser (p= 0.024). Failure modes were dominantly cohesive in all groups tested and one representative specimen each failure mode was examined in SEM and the general characteristics of the failure modes were confirmed. Conclusion: With in the limitations of the present study, when used CEM, Er: YAG laser-assisted retrograde cavity preparation positively affected the bond strength values compared to BIO MTA+. Considering its optimal adhesion, the calcium-enriched-mixture-cement (CEM) might be a good option as a filling material in retrograde cavities in clinical use. © 2022, Universidade Estadual Paulista, Institute of Science and Technology of Sao Jose dos Campos. All rights reserved.
  • [ X ]
    Öğe
    Effect of microabrasion on the staining susceptibility of enamel: An in vitro study
    (Tabriz University of Medical Sciences, 2022) Bahadir, Hasibe Sevilay; Haberal, Merve; Çelik, Çiğdem
    Background. Enamel microabrasion can eliminate enamel irregularities and discoloration. This study evaluated the staining susceptibility of enamel after microabrasion using different clinical protocols. Methods. A total of 210 extracted bovine incisors were used in this study. The teeth were randomly divided into five groups of 42 teeth each (n = 42), including group 1: control (no treatment), group 2: microabrasion, group 3: microabrasion + fluoride polishing, group 4: macroabrasion (fine-grit diamond bur) + microabrasion, and group 5: macroabrasion (fine-grit diamond bur) + microabrasion + fluoride polishing. The groups were then randomly divided into two subgroups for discoloration procedures: coffee and distilled water (n = 21). A spectrophotometric evaluation was carried out at baseline and on the 1st, 7th, 14th, and 28th days of the staining period. Statistical analyses were performed using repeated-measures ANOVA and the post hoc Bonferroni test at a significance level of 0.05. Results. The greatest color change was observed in group 2 specimens, which were immersed in coffee solutions. The color change values for groups 3, 4, and 5 specimens, which were immersed in distilled water, were higher than those in group 1 specimens (P < 0.05). The fluoride polishing + enamel microabrasion treatment groups (groups 3 and 5) exhibited greater resistance to color changes than the matched non-fluoride-polished groups (groups 2 and 4) (P < 0.05). Conclusions. The teeth that underwent enamel microabrasion treatment and were polished with fluoride gel became more resistant to color changes. Our findings confirm that enamel microabrasion treatment is a conservative method for localized discoloration. © 2022 The Author(s).
  • [ X ]
    Öğe
    EVALUATION OF ESTHETIC SELF-PERCEPTIONS OF UNDER AND POST-GRADUATE DENTAL STUDENTS
    (2020) Çelik, Çiğdem; Adışen, Mehmet Zahit; Azaklı, Elif; Aktürk, Ömer; Kaçar, Ayşenur
    Background and Aim: This study aimed to evaluate the dentalestheticself-perceptionsofundergraduateandpostgraduate students attending the Faculty of Dentistry at Kırıkkale University. Materials and Methods:Aquestionnaireconsistingoftwo parts was applied to the participants. In the first part, the undergraduate and postgraduate participants answered a questionnaire measuring their self-perceptions of dental esthetics. In the second part, the students were asked to rate the importance of the characteristic features of a face on a 100-mm visual analog scale (VAS) bar. Data were statistically analyzed using the Pearson chi-square, Mann-Whitney U, and Kruskal-Wallis tests at a significance level of 0.05. Results: The overall mean satisfaction index was 6.86. The participants in the postgraduate group and female students were the most satisfied with their smiles (p<0.05). Among the facial features important to facial attractiveness, teeth scored the highest (86.9) on the VAS. The female students achieved an overall higher mean score than the males on the VAS for facial features: teeth, nose, and lips (p<0.05). Conclusion: The dental students in the study group were found to have a moderate degree of satisfaction with their individual dental esthetic characteristics, and this phenomenon varied because of gender and academic level.
  • [ X ]
    Öğe
    The comparison of the repair bond strength of the composite resin to direct and indirect composite restorations with different surface preparations
    (Tabriz University of Medical Sciences, 2023) Bahadir, Hasibe Sevilay; Polatoğlu, Selin; Tuncer, Duygu; Çelik, Çiğdem
    Background. Indirect restorations have been employed in restorative dentistry to solve some of the drawbacks of direct restorations. The aim of this study was to evaluate the effect of different modes of a universal adhesive resin on the repair capacity of two indirect resin composites and a direct resin composite. Methods. Indirect composite resins (Ceramage and Gradia Plus) and a direct composite resin (Filtek Z250) were prepared in a plastic mold with a height and diameter of 2-mm and 6-mm, respectively. Composite blocks were thermocycled (5000 cycles, 5°C-55°C). Then, according to their surface treatments, composite blocks were categorized into six-groups: Group 1: ER (etch&rinse), Group 2: SE (self-etch), Group 3: Bur + ER (bur + etch&rinse), Group 4: Bur + SE (bur + self-etch), Group 5: Bur + Silane + ER (bur + silane + etch&rinse), Group 6: Bur + Silane + SE (bur + silane + self-etch), respectively. After surface treatments and adhesive application for bonding with a direct resin composite, all groups were then thermocycled before performing shear-bond-strength-test. Failure modes were evaluated using a stereomicroscope. Data were analyzed by two-way-ANOVA and Bonferroni-test (P < 0.05). Results. The highest bond-strength values were obtained for Bur + Silane + SE groups, while the lowest values were obtained for the Bur + Silane + ER groups for all materials. Statistically significant differences were observed between the Bur + Silane + ER group and ER, Bur + ER and Bur + Silane + SE groups in Gradia Plus (P < 0.05). Conclusion. The self-etch-mode of the universal-adhesive and silane applications led to the increase in the repair-strength of the adhesive in the Filtek Z250 and Ceramage. The self-etch-mode of the universal-adhesive might be used to reduce adhesive-application-steps in the clinical repair procedures. © 2023 The Author(s).
  • [ X ]
    Öğe
    THE EFFECT OF DIFFERENT INSTRUMENT LUBRICANTS ON SURFACE MICROHARDNESS OF A MICROHYBRID RESIN COMPOSITE
    (2021) Arhun, Neslihan; Kalender, Berçem; Çelik, Çiğdem; Tuncer, Duygu; Berkmen, Begüm
    Background and Aim: This study aimed to evaluate the\reffects of different instrument lubricants on the surface\rmicrohardness of a resin composite.\rMaterial and Method: A total of 180 disk-shaped specimens\rof a resin composite (Filtek Z250; 3M-ESPE) were prepared in\rplastic molds and randomly divided into six groups according\rto the lubricants tested (n= 30)—group 1: control (no\rlubricant was used); group 2: ethanol; group 3: etch-and-rinse\radhesive (Adper Single Bond 2; 3M-ESPE); group 4: self-etch\radhesive (Clearfil SE Bond/the use of adhesive bottle only);\rgroup 5: universal adhesive (G-Premio Bond; GC); and group\r6: Bisco modeling resin. The Vickers hardness number was\rassessed using a microhardness tester. Following the baseline\rmeasurements, finishing/polishing procedures were performed,\rand microhardness was remeasured. The data gathered were\rstatistically analyzed (p< 0.05).\rResults: There was a statistically significant difference\rbetween the control and lubricant groups (p< 0.05). Although\rfinishing/polishing procedures improved the microhardness\rvalues in all the groups, a significant difference was found\rbetween the control and lubricant groups, except for the\rethanol group (p< 0.05).\rConclusion: Instrument lubricants changed the surface\rmicrohardness of the resin composite tested.
  • [ X ]
    Öğe
    THE EFFECT OF FINISHING AND POLISHING SYSTEMS ON THE SURFACE ROUGHNESS OF INDIRECT COMPOSITE RESINS
    (2023) Bahadır, Hasibe Sevilay; Çetinbak, İrem; Polatoğlu, Selin; Çelik, Çiğdem
    Objective: The aim of this study was to evaluate the effects of different types of finishing and polishing systems on the surface roughness of indirect composite resins. Materials and Methods: In this study, 2 indirect composite resins (Gradia Plus (GC Inc., Kyoto, Japan, and Ceramage, SHOFU Inc., Kyoto, Japan) and 2 direct composite resins (FiltekZ250, 3M ESPE, St. Paul, USA and GradioSO, VOCO GmbH, Cuxhaven, Germany) were used. A total of 144 discs specimens were prepared. The specimens were randomly divided into 3 subgroups (n=12). Group K: Mylar Strip Band (Control), Group L: Silicone Polisher (Nais, Sofia, Bulgaria), Group D: Super Snap disc (SHOFU, Kyoto, Japan) polishing systems were used. The surface roughness of the specimens was measured using a profilometer (Surftest-211, Kanagawa, Japan). The data were analyzed statistically (p<0.05). Results: The Mylar strip band surface (control) was measured as the smoothest surface in all groups. While the roughest surface measured was polishing with silicone polishers. (p<0.05). While there is no significant statistical difference between the Mylar strip band and yellow rubber polishing system in all materials, a significant difference was found in the Super Snap polishing disc system between Filtek Z250 and Ceramage material (p=0.002). Conclusions: In this study, both the polishing systems used and the materials used had an effect on the surface roughness of indirect resin composites.
  • [ X ]
    Öğe
    Üç Farklı Adeziv Teknik Kullanılarak Yapılan Posterior Kompozit Restorasyonların Bir Yıllık Değerlendirilmesi: Bir Klinik Çalışma
    (2022) Bayraktar, Yusuf; Özdemir, Behiye Esra; Çetinbak, İrem; Çelik, Çiğdem
    Amaç: Bu çalışma, 3 farklı adeziv teknik kullanılarak yapılan posterior kompozit restorasyonların klinik performansını değerlendirmeyi amaçlamıştır. Gereç ve Yöntemler: Çalışmaya arka dişlerinde restorasyon gerektiren en az 3 çürük dişi olan toplam 29 hasta dâhil edildi. Çürük dişlerin her birine rastgele farklı bir yöntemle kompozit restorasyonlar yapıldı. Farklı yöntemlerin her biri aşağıdaki gibi bir grubu temsil ediyordu: Grup 1: Mine kenarlarını %37 fosforik asitle seçici olarak asitleme+universal bir adeziv uygulanması (Adhese Universal, Ivoclar, Schaan, Lihtenştayn), Grup 2: Universal bir adeziv sisteminin uygulanması (Adhese Universal, Ivoclar, Schaan, Lihtenştayn), Grup 3: Self-etch adeziv sisteminin uygulanması (Clearfil SE Bond, Kuraray, Okayama, Japonya). Adeziv prosedürü farklı olmasına rağmen her grup bir posterior kompozit rezin (Clearfil Majesty Posterior, Kuraray, Okayama, Japonya ) ile restore edildi. Restorasyonlar 6 ay ve 1 yıl sonra FDI Dünya Diş Hekimliği Federasyonu kriterlerine göre kalibre edilmiş 2 klinisyen tarafından değerlendirildi. Veriler %95 güven aralığında Kruskal-Wallis ve Wilcoxon testleri kullanılarak analiz edildi. Bulgular: Bir yılın sonunda kontrol muayenesine 26 hasta katıldı. İncelenen kriterler açısından 1 yıl sonunda gruplar arasında anlamlı fark bulunmadı (p>0,05). Her 3 grubun da başlangıç skorları ile 1 yıl sonraki skorları istatistiksel olarak benzer bulundu (p>0,05). Sonuç: Bu çalışmanın sınırlamaları dâhilinde grupların 1 yıllık klinik performansları benzer bulundu. Bu konuda daha uzun takip süreli klinik çalışmalara ihtiyaç vardır.