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Öğe Borik Asitin Kök Dentin Üzerine Etkisi Mineral İçeriği ve Bağ Dayanımı AH-Plus: SEM-EDX Çalışması(2016) Akman, Melek; Belli, Sema; Olcay, Keziban; Özçopur, BetülBorik asit, EDTA ve sitrik asitin kök dentininin mineral içeriğine ve AH Plus’ın makaslama bağlanma dayanımına etkisini araştırmaktır. Gereç ve Yöntemler: 18 adet çekilmiş premolar dişler kullanıldı. Dişlerin kuron kısımları kaldırıldı. Herbir dişten iki kök yarısı elde etmek için su soğutması altında uzunlamasına kesit alındı. SEM EDX kullanılarak element seviyeleri ölçüldü. AH Plus ile build-up oluşturuldu. Element seviyeleri ve makaslama bağlanma dayanım değerleri (MPa) kaydedildi. Shear testi yapıldıktan sonra kök yüzeyleri tekrar düzleştirildi ve %5,25 NaOCl’u takiben %10 Borik asit, %17 EDTA and %10 Sitrik asit uygulandı. Kök yüzeyleri tekrar SEM EDX ile ölçüldü. Element seviyeleri ve makaslama bağlanma dayanım değerleri kaydedildi (MPa) ve paired t testi kullanılarak analiz edildi. Bulgular: Borik asit uygulanımı kök dentininin O, Na, K ve Ca/P oranını (p<0.001) artırdı, Ca, C, Mg mineral içeriğini (p>0.05) değiştirmedi. EDTA uygulanımı O, Na, C, Ca/P oranını artırdı (p<0.001), Ca, P, S mineral içeriğini azalttı (p<0.001). Sitrik asit uygulanımı C, Na, Ca/P oranını artırdı (p<0.001), Ca, P, S mineral içeriğini azalttı (p<0.05). Sitrik asit uygulanımı AH Plus’ın makaslama bağlanma dayanım değerini değiştirmedi (p=0.218). Hem Borik asit hem de EDTA uygulanımı AH Plus’ın makaslama bağlanma dayanım değerini azalttı (p=0.000). Sonuç: Tüm test edilen materyaller kök dentininin mineral içeriğini değiştirdi. Borik asit ve EDTA AH Plus’ın makaslama bağlanma dayanımını azalttı. Borik asit alternatif şelasyon ajanı olarak düşünülebilir ancak materyalin kullanım güvenilirliği için daha ileri çalışmalara ve klinik uygulamalara ihtiyaç vardır.Öğe Comparison of Different Irrigation Activation Regimens and Conventional Irrigation Techniques for the Removal of Modified Triple Antibiotic Paste from Root Canals(Elsevier Science Inc, 2015) Akman, Melek; Akbulut, Makbule Bilge; Aydinbelge, Hale Ari; Belli, SemaIntroduction: The aim of this study was to compare the efficacy of irrigation activation regimens and conventional syringe irrigation technique in the removal of modified triple antibiotic paste (mTAP) from root canal walls. Methods: Fifty-six extracted human mandibular premolars were prepared using ProTaper rotary files (Dentsply Maillefer, Ballaigues, Switzerland) up to size F4. The root canals were filled with mTAP medicament, and after 21 days, the roots were randomly assigned to 5 groups (n = 10) according to the irrigation regimens used: conventional syringe irrigation (Cl), Self-Adjusting File (SAF; ReDent-Nova, Ra'anana, Israel), EndoVac (Discus Dental, Culver City, CA), EndoActivator (Dentsply, Tulsa, OK), and passive ultrasonic irrigation (PUI). In 3 teeth, mTAP was not removed (positive controls), and another 3 teeth were not filled with mTAP (negative controls). The roots were sectioned, and the amount of remaining medicament at each root half (n = 20) was evaluated at 30x magnification using a 4-grade scoring system. Data were evaluated using the Kruskal-Wallis and Mann-Whitney U tests. Results: There were statistically significant differences among all experimental groups; of which, the Cl group was the significantly least efficient in removing mTAP from the root canal (P < .05). At the apical and middle third, the PUI, SAF, EndoVac, and EndoActivator groups removed significantly more mTAP medicament than the Cl group (P < .05); however, there were no significant differences between these groups (P > .05). The SAF and PUI showed significantly better performances in removing mTAP from the coronal third (P < .05). Conclusions: The use of irrigation activation regimens significantly improves the removal of mTAP from root canals when compared with Cl.Öğe The Effect of Different Fiber Post-Application Techniques on Fracture Resistance of Structurally Compromised Premolars with Flared Root Canals: An In Vitro Study(Sage Publications India Pvt Ltd, 2022) Kanyilmaz, Ata Nisa Coban; Akman, Melek; Sismanoglu, Soner; Belli, SemaAim: Intraradicular post systems have become an important treatment method for endodontically treated teeth as they provide retention for restoration to the remaining tooth structure. The objective of the present in vitro study was to evaluate the effect of different fiber post-application techniques on the fracture resistance of premolars with flared root canals and no ferrule. Materials and Methods: Sixty freshly extracted, single-rooted mandibular premolars with no ferrule were endodontically treated by an experienced endodontist, and their root canals were experimentally flared. The specimens with flared root canals were divided into five groups according to fiber post-application techniques (n = 12): a prefabricated fiber post (G1), G1 + two auxiliary posts (G2), i-TFC post system (G3), G1 + quartz splint (G4), and Ribbond (G5). The data were analyzed with analysis of variance and Tukey tests. Results: The findings were revealed that no significant difference was found among four groups, except G5 (P > .05), which demonstrated the lowest fracture resistance (P < .05). G2, G3, G4, and G5 exhibited dominantly restorable fracture pattern, whereas G1 exhibited nonrestorable fracture pattern. Conclusion: Within the limitations of this study, the placement of auxiliary posts, i-TFC post system, quartz splint placement, and Ribbond increased the incidence of restorable fracture compared with the controls.Öğe A laboratory investigation on the effect of biguanide- and pyridine-derived antiseptics on the adhesion of resin composites to dentin(Wiley, 2023) Ucar, Arzu Yagmur; Kolus, Turkay; Bozkurt, D. Alperen; Neelakantan, Prasanna; Ali, Islam A. A.; Belli, SemaOptimal bonding of adhesive restorations to dentin is crucial to prevent microleakage and enhance the survival of root-filled teeth. The aim of this study was to investigate the effect of chlorhexidine (CHX), alexidine (ALX) and octenidine dihydrochloride (OCT) on the bond strength of resin composites to coronal dentin. Human coronal dentin specimens were treated with 2% CHX, 0.1% ALX, 0.1% OCT or saline then restored with traditional or bulk-fill resin composites. The adhesion strength between the resin and dentin was measured using the microtensile bond strength and failure mode was determined using a stereomicroscope. Treatment with ALX and OCT resulted in significantly greater mu TBS compared with CHX and saline, irrespective of the resin composite used. Alexidine treatment predominantly resulted in mixed failure, while adhesive failures were frequently observed in CHX and saline-treated dentin. In conclusion, final irrigation with ALX or OCT improved the bonding of resin composites to dentin.Öğe Perforasyon tamir materyallerinin sızıntı ve kalitesi: İntrakoronal ve retrograd tekniklerin karşılaştırılması(2014) Özçopur, Betül; Akman, Melek; Hakkı, Sema; Belli, SemaAmaç: Bu in vitro çalışmanın amacı, perforasyon tamir materyallerinin, perforasyon bölgesine ortograd ya da retrograd yerleştirildiğinde, sızıntı ve kalitesini değerlendirmektir. Gereç ve Yöntemler: Çekilmiş insan molar dişlerin mesial ve distal kök yüzeylerinde, dişin uzun aksına 45 derecelik açıyla elmas bir frez ile kasten perforasyonlar oluşturuldu. Mesial perforasyonlar intrakoronal olarak şu materyaller kullanılarak tamir edildi: IRM (Dentsply), amalgam (Dentsply), Dyract (Dentsply), SuperBond C&B (Sun Medical) and MTA (Dentsply). Siman ile giriş kavitesi doldurulduktan sonra distal perforasyonlar aynı materyaller ile retrograd olarak tamir edildi. Dişler %100 nemli ortamda 24 saat saklandı. Perforasyon bölgeleri 24 saat %2'lik metilen mavisinde bekletildi. Dişler kesilerek, 20x ve 40x büyütme ile stereomikroskop altında incelendi ve boya penetrasyonuna göre taşmış, yeterli ve yetersiz olarak skorlandı. Bulgular: Veriler Kruskal-Wallis ve MannWhitney U-testleri ile analiz edildi. Restorasyon teknikleri arasında önemli derecede fark bulundu (p0.05). Tüm materyallerde retrograd teknik kullanıldığı zaman daha az sızıntı gözlendi (p0.05). Giriş kavitesi boyunca perforasyonun tamiri, %86 taşmış ya da yetersiz bulundu. Retrograd olarak uygulandığı zaman IRM %80, MTA %60 oranında sızıntı olmadan yeterli bulundu. Sonuç: Retrograd teknik kullanarak perforasyonların tamiri, kullanılan materyalin etkisi olmaksızın yeterli restorasyonun sayısı önemli derecede arttı. IRM retrograd uygulandığı zaman MTA'yı takiben en iyi kapamayı sağladı.Öğe Which is effective on bond strength of resin-based sealers: incorporation of powdered dentin to primer or adhesive?(Taylor & Francis Ltd, 2015) Akman, Melek; Belli, Sema; Ozcopur, Betul; Eskitascioglu, GuercanThe aim of this study was to investigate the effect of adding powdered dentin to primer or adhesive in a self-etch system on the shear bond strength of three resin-based sealers. Seventy-two premolars were sectioned buccolingually, and 144 root halves were divided into three groups according to the sealer used: epoxy resin-based sealer (AH Plus), methacrylate resin-based (RealSeal, Hybrid Root SEAL) n=48. The surfaces were irrigated with 5% NaOCl, 17% EDTA, distilled water for 5min. Four subgroups were created (n=12): control group; Clearfil Liner Bond 2V treated group; powdered dentin added to the primer of Clearfil Liner Bond 2V (40 wt.%); and powdered dentin added to the adhesive of Clearfil Liner Bond 2V (20 wt.%). Dentin powder was prepared. Three mm high buildups with a constant surface area of 3.45mm(2) were created using the sealers and allowed to set (37oC, 100% humid, 72h). The samples were tested to failure for shear bond strength (1mm/min). The data were calculated (MPa) and analyzed using two-way ANOVA, one-way ANOVA, and Tukey HSD tests. Adhesive use decreased the bonding performance of AH Plus (p=0.00). Mean bond strength of the other sealers was found similar to control. Primer or adhesive resin with powdered dentin did not increase the adhesive performance of the self-etch system used. The shear bond strength of RealSeal was significantly increased when powdered dentin was added to primer or adhesive (p=0.00). The effect of adding powdered-dentine to primer or adhesive in a self-etch system on the shear bond strength was sealer-dependent .
