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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, BetülAmmaaççÖğe 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 Effect of cyclic loading and an intermediate material on microtensile bond strengths of a dual-cure resin cement to dentin resin-coated with all-in-one adhesives(ELSEVIER TAIWAN, 2012) Belli, Sema; Ozcopur, Betul; Yesilyurt, Cemal; Akman, Melek; Breslin, Nicholas; Dorsman, GregBackground/purpose: The purpose of this in vitro study was to evaluate the effects of mechanical loading and an intermediate material on microtensile bond-strengths (mu TBSs) of four all-in-one adhesives and a total-etching adhesive system to dentin. Materials and methods: Dentin surfaces of sound human third molars were exposed and treated with Danville Experimental (Danville Materials), G Bond (GC), Clearfil S-3 Bond (Kuraray), AdheSE One (Vivadent), and Prelude total-etch (Danville Materials). Dual-curable resin (Multicore; Vivadent) build-ups were created with and without the use of Prelude Dual/Self Cure Link (Danville Materials). Two subgroups were created (with and without mechanical-loading: 5 x 10(4)[cycles]; 50 N at 0.2 Hz). After storage at 37 degrees C for 1 week, the mu TBS test was performed. Data were calculated (MPa) and statistically analyzed (multivariate analysis of variance and Scheffe's tests). Results: Pre-test failure was observed, and no data were obtained from groups in the absence of Prelude Dual/Self Cure Link, except for the Prelude total-etch group. Prelude total-etch provided significantly higher mu TBSs to dentin than did the other adhesives (P < 0.05). Bond strengths of all tested adhesives were significantly reduced upon application of the loading regimen (P < 0.05). Clearfil S-3 Bond and G Bond provided significantly higher mu TBSs to dentin than AdheSE One and the experimental adhesive (P < 0.05). Conclusion: Mechanical loading significantly decreased the adhesive performance, and Prelude Dual/Self Cure Link increased it for all-in-one adhesives when used with a dual-curable resin. Copyright (c) 2012, Association for Dental Sciences of the Republic of China. Published by Elsevier Taiwan LLC. All rights reserved.Öğe Effect of intracanal medicaments on the push-out bond strength of Biodentine in comparison with Bioaggregate apical plugs(TAYLOR & FRANCIS LTD, 2016) Akman, Melek; Akbulut, Makbule Bilge; Guneser, Mehmet Burak; Eldeniz, Ayce UnverdiTo evaluate the effect of intracanal medicaments on the push-out bond strength of Biodentine in comparison with DiaRoot BioAggregate (BA) when used as apical plugs. Forty single-rooted teeth were prepared using Peeso reamers. The samples were divided into four groups. The intracanal medicaments were applied to the root canals as follows: Group1: a combination of metronidazole-ciprofloxacin-cefaclor, Group2: a combination of metronidazole-ciprofloxacin, Group3: calcium hydroxide, and Group4: no medication. After 21 days, the medicaments were removed. The apical part of each root was horizontally sectioned into 1-mm thick slices. The samples were divided into two subgroups, and the following materials were placed: Biodentine, DiaRoot-BioAggregate. After 48-h incubation, the push-out bond strength was measured. The data were analyzed by a two-way ANOVA. Biodentine showed a significantly higher mean push-out bond strength value than DiaRoot-BioAggregate (P=0.00). The medications have an effect on the push-out bond strength of both materials (P=0.002). Biodentine showed better adhesive performance as an apical plug than DiaRoot-BioAggregate.Öğe Endodontik Enfeksiyonların Tedavisi İçin Antibiyotik Reçete Edilmesi: Türkiye'de Diş Hekimleri ve Diş Hekimliği Öğrencileri Arasındaki Anket Araştırması(Selçuk Üniversitesi, 2009) Bozkurt, Durmuş Alperen; Avuçalmaz, Büşra; Akman, MelekAmaç: Diş hekimliği öğrencilerinin ve diş hekimlerinin endodontik enfeksiyonlar için antibiyotik reçeteleme konusundaki görüşlerini değerlendirmek. Gereç ve Yöntemler: Çalışmamıza Necmettin Erbakan Üniversitesi Diş Hekimliği Fakültesi dördüncü/beşinci sınıf öğrencileri ve mezun olmuş diş hekimleri Google Formlar ile katılmıştır. Çalışmaya 139 diş hekimi (G1), 74 beşinci sınıf (G2) ve 63 dördüncü sınıf (G3) öğrencileri katılmıştır. Anket, 26 niteliksel ve niceliksel sorudan oluşmuştur. İlk 13 soruda, mezuniyet yılı, mezun olduğu diş hekimliği fakültesi, her iş günü başına görülen hasta sayısı, endodontik acil hasta sayısı ve endodontik tedaviler için mevcut antibiyotik reçete yazma kılavuzları bilinci gibi genel bilgiler kaydedildi. Sonraki 9 soruda, katılımcılardan antibiyotik yazıp yazmadıklarını söylemelerinin istendiği bir dizi varsayımsal klinik senaryo içermektedir. Geri kalan 3 soruda hangi antibiyotiği tercih ettikleri dozları ve süresi hakkında sorular bulunmaktadır. Veriler, tanımlayıcı istatistikler ve anlamlılık düzeyi p=0.05 ki-kare testi kullanılarak analiz edilmiştir. Bulgular: Anket sorularının iletildiği 463 kişiden 276 kişi cevaplamıştır ve oranı %59.6’dır. Öğrencilerin mezun diş hekimlerinden istatistiksel olarak anlamlı derecede daha fazla rehber kılavuzların farkında olduğunu belirtmiştir (p=0.008). Akut apikal periodontitisli, sistemik tutulumu olmayan-lokalize fluktuan şişliği olan akut apikal apseli ya da uygun kök kanal tedavileri ile çözülemeyen kronik eksüdasyon varlığında diş hekimleri öğrencilere göre istatistiksel olarak anlamlı daha fazla antibiyotik tercih etmişlerdir (p<0.05). Sonuç: Diş hekimlerin klinik deneyim süresi arttıkça endodontik rehber kılavuzlara göre daha fazla antibiyotik tercih etmişlerdir. Eğitimin devamlılığı ve bilginin sürekli yenilenmesi ile endodontik acil tedavilerde gereksiz antibiyotik reçete edilmesi önlenebilir.Öğe Endodontik Tedavi Öncesi ve Sonrası Anksiyete Seviyesi ve Korku Analizi(Selçuk Üniversitesi, 2021) Akman, Melek; Ovalıoğlu, Zeynep; Bozkurt, Durmuş AlperenAmaç: Bu çalışmanın amacı endodontik tedavi öncesi ve sonrası anksiyete ve korku düzeylerini analiz etmektir. Gereç ve Yöntemler: Bu çalışma Necmettin Erbakan Üniversitesi Diş Hekimliği Fakültesi Endodonti Anabilim Dalı’na Kasım 2019’dan Şubat 2020’ye kadar gelen hastalar üzerinde yapıldı. Endodonti Anabilim Dalı’na başvuran yaşları 18-50 arasında değişen toplam 200 hasta çalışmaya dahil edildi. Yapılan çalışma iki grup anket içermektedir. Hastalardan endodontik tedavi öncesi ve sonrası birer anket doldurmaları istendi.Verilerin analizinde tanımlayıcı istatistikten ve Ki-kare testinden yararlanıldı. Bulgular: Kırk(%20) hasta orta derecede, 23(%11.5) hasta ciddi dereceli endişeli bulunmuştur. Sekiz (%7.7) kadın hasta, 1(%1) erkek hasta kök kanal tedavisi yapılırken eğelerin verdiği histen; 6(%6.3) erkek hasta, 3(%2.9) kadın hasta röntgen filminin ağıza yerleştirilmesinden;1(%1) erkek hasta, 4(%3.8) kadın hasta cihaz titreşiminden; 1(%1) erkek hasta, 6(%5.8) kadın hasta anestezi yapılmasından ciddi derecede endişe duyuyordu. Sonuç: Bu çalışma, kadın hastaların, kök kanal tedavisinden önce Corah Dental Anksiyete ölçeği ile yüksek ve ciddi derecede endişeli oldukları sonucuna varmıştır. Kök kanal tedavisinden sonra da kadın hastaların oldukça endişeli olduğu görüldü.Öğe Fracture resistance of roots obturated with a novel calcium silicate-based endodontic sealer (BioRoot RCS)(TAYLOR & FRANCIS LTD, 2016) Guneser, Mehmet Burak; Akman, Melek; Kolcu, Inci Baser; Eldeniz, Ayce UnverdiThe aim of this ex vivo study was to evaluate the vertical-fracture resistance of roots obturated with a newly developed tricalcium silicate cement (BioRoot RCS; Septodont, Saint Maur Des Fosses, France) using cold lateral compaction technique (LC) or matched-taper single-cone gutta-percha technique (SC). Decoronated 82 single-rooted mandibular premolars were chemo-mechanically prepared and then randomly divided into 6 experimental groups (n = 12) and 2 control groups (n = 5): Group 1 iRoot SP-LC; Group 2 iRoot SP-SC; Group 3 MTA Fillapex-LC; Group 4 MTA Fillapex-SC; Group 5 BioRoot RCS-LC and Group 6 BioRoot RCS-SC. In the positive-control group, roots were instrumented but not filled, and in the negative-control group, roots were neither instrumented nor filled. All samples were incubated for two weeks and then subjected to vertical loading force (1 mm/min) until fracture. The force required to fracture each specimen were determined, and the data were statistically analyzed. The highest significant fracture resistance was recorded for the iRoot SP-LC, iRoot SP-SC, BioRoot RCS-LC, and BioRoot RCS-SC groups, with no significant difference among them (p > 0.05) when compared with the positive-control group (p < 0.05), whereas the lowest significant values were observed in the MTA Fillapex-LC and MTA Fillapex-SC groups (p < 0.05). The vertical fracture resistance of roots obturated with BioRoot RCS and iRoot SP sealers using either LC or SC technique was found to be similar to that of intact teeth. BioRoot RCS, newly developed tricalcium silicate cement, might have the potential to reinforce the instrumented teeth against vertical root fracture.Öğe Influence of several fibre-reinforced composite restoration techniques on cusp movement and fracture strength of molar teeth(WILEY, 2011) Akman, Serhan; Akman, Melek; Eskitaşcıoğlu, Gülhan; Belli, SemaP>Aim To compare mean cusp movement in molar teeth with endodontic access and mesial-occlusal-distal (MOD) cavities before and after restoration with several fibre-reinforced composite restoration techniques under loading and to evaluate the effect of restoration technique on fracture strength. Methodology Reference points were marked at the mesial cusp ridges of extracted human mandibular molar teeth. Digital images were taken under loading (300 N) using a stereomicroscope (Leica MZ16A; Wetzlar, Germany). Three-dimensional (3D) distances between the reference points were recorded (Leica, Stereo-Explorer, 2.1) as controls. Standard MOD cavities were prepared and restored as follows (n = 10), group 1: composite restoration (Clearfil AP-X; Kuraray, Tokyo, Japan); group 2: cavity lined with polyethylene fibre (Ribbond, Ribbond Inc., Seattle, WA, USA) in combination with flowable resin (Protect-Liner F; Kuraray, Tokyo, Japan) before composite restoration; group 3: polyethylene fibre inserted on occlusal surface of the tooth from buccal to lingual after finishing the composite restoration; group 4: missing walls were restored with composite resin and inner surfaces of the axial walls were then reinforced with polyethylene fibre placed circumferentially before the composite restoration. The restored teeth were re-loaded, digital images were re-taken and the 3D distance between the reference points was recorded in mu m. Comparisons of the restoration techniques, the effectiveness of restoration for each group were analysed statistically (Kruskall-Wallis, paired-samples t-test). The teeth were then loaded until failure (5 mm min-1), the data were recorded (N) and analysed statistically (Kruskall-Wallis test). Results A significant difference occurred amongst the groups in terms of cusp movement (P = 0.018). All the groups revealed a decrease in inter-cuspal width when compared to their initial records. The mean values of these decreases were as follows: group 1 17.6 (P = 0.003), group 2 6.7 (not sig), group 3 6.6 (not sig) and group 4 0.85 (not sig) mu m. No significant difference was found amongst the fracture strength values (P = 0.22). In group 1, 90% of the fractures were non-restorable, whereas in group 3 100% of the fractures were restorable. Conclusions Regardless of restoration technique, fibre reinforcement of composite restorations decreased cusp movement in molar teeth with MOD and endodontic access cavities but did not affect fracture strength.Öğe Modifiye Üçlü Antibiyotik Patının Uzaklaştırılmasında Fotonla İndüklenmiş Fotoakustik Dalgalanma ile Farklı İrrigasyon Aktivasyon Rejimlerinin Kombinasyonunun Karşılaştırılması(Selçuk Üniversitesi, 2023 Ağustos) Akman, Melek; Terlemez, Arslan; Akbulut, Makbule Bilge; Arı Aydınbelge, HaleAmaç: Bu çalışmanın amacı, kök kanallarından modifiye üçlü antibiyotik patının (mTAP) uzaklaştırılmasında foton kaynaklı fotoakustik dalgalanma (PIPS) tekniği ile farklı irrigasyon aktivasyon protokollerinin etkinliklerini karşılaştırmalı olarak incelemektir. Gereç ve Yöntemler: 111 adet çekilmiş insan mandibular-premolar dişi ProTaper döner eğe kullanarak şekillendirildi. Kök kanalları mTAP ile dolduruldu ve 4 hafta sonra kökler kullanılan irrigasyon rejimlerine göre rastgele 7 gruba (n=15) ayrıldı: Self-Adjusting File (SAF), Pasif-Ultrasonikİrrigasyon (PUI) , EndoAktivatör (EA), SAF+EA, SAF+PUI, PUI+EA ve PIPS. Kalan dişlerin 3’ünde mTAP uzaklaştırılmazken (pozitif kontrol) negatif kontrol grubu olarak kullanılan diğer 3 dişin kanalı mTAP ile doldurulmadı. Kökler uzunlamasına ikiye ayrıldı ve kanal duvarlarında kalan mTAP miktarı, 4 dereceli bir skorlama sistemi kullanılarak x20 büyütme altında değerlendirildi. Veriler Kruskal-Wallis ve Mann-Whitney U testleri kullanılarak istatistiksel olarak değerlendirildi. Bulgular: Tüm deney grupları arasında istatistiksel olarak anlamlı farklılık tespit edildi. PIPS, SAF, SAF+EA ve SAF+PUI, mTAP'yi kök kanalından çıkarmada PUI ve PUI+EA'dan önemli ölçüde daha iyi performans gösterdi (P=0.000). EA orta düzeyde etkinlik gösterdi. Apikal ve orta üçte birlik kısımda PUI ve PUI+EA ve koronal üçte birlik kısımda PUI diğer gruplara kıyasla daha düşük performans sergiledi (P<0.05). Sonuç: Kök kanallarından üçlü antibiyotik patın tamamen uzaklaştırılması mümkün olmadı. Yalnızca PIPS tekniği, apikal üçte birlik kısımda tüm mTAP'ın kaldırılmasında diğer tekniklerden daha başarılı bulundu.Öğe Push-out bond strength of a new post system after various post space treatments(JAPANESE SOC DENTAL MATERIALS DEVICES, 2016) Akman, Melek; Eldeniz, Ayce Unverdi; Ince, Selen; Guneser, Mehmet BurakTo assess the effect of post-space treatment with chelating agents on the push-out bond-strength of a glass fiber post-system. Fortyeight human teeth were decoronated. The roots were prepared to size 40 and obturated. The post-spaces were prepared with PeesoReamer drills. The post-spaces were irrigated with (i) NaOCl and EDTA with chlorhexidine (QMix), NaOCl and EDTA, NaOCl and Citric acid, (iv) NaOCl and saline as a control group. i-TFC glass fiber posts were then luted with i-TFC bond system. The samples were horizontally sectioned. The displacement resistance was measured. Push-out bond-strength (MPa) was calculated. Data were analyzed. NaOCl/QMix group showed highest values to dentine whereas NaOCl/Citric acid group showed lowest values. i-TFC post-system demonstrated equal bond strength values when post-space treated with either NaOCl/EDTA or NaOCl/Saline. It can be concluded that post-space could be treated with NaOCl and QMix in order to increase adhesion of i-TFC post-system to root dentine.Öğe Quality and leakage of perforation repair-materials: A comparison of intracoronal and retrograde techniques(Selçuk Üniversitesi, 2014) Özçopur, Betül; Akman, Melek; Hakkı, Sema; Belli, SemaThe objective of this in vitro study was to evaluate the quality and leakage of repair materials when perforation sites were challenged from an orthograde or retrograde direction. Intentional perforations were created on the mesial and distal root surfaces of the extracted human molar teeth (below the CEJ) using a diamond bur at a 45 degree angle to the long axis. Mesial perforations were repaired intracoronally using the following materials (n=15): IRM (Dentsply), amalgam (Dentsply), Dyract (Dentsply), SuperBond C&B (Sun Medical) and MTA (Dentsply). After filling the access cavities with cement, distal perforations were repaired retrogradely using the same materials. The teeth were kept at humid conditions (100%, 24hrs), the perforation sites were stained with 2%methylene blue (24hrs), sectioned and examined under a stereomicroscope at 20x and 40x magnifications and scored as extruded, insufficient or adequate in combination with the dye penetration. The data was statistically analyzed (Kruskal-Wallis and Mann-Whitney U-tests). A significant difference was found among the restoration techniques (p<0.05). All the materials showed less leakage when used retrogradely (p<0.05). Repair of the perforation through the access cavity resulted in 86% extruded or insufficient restorations with leakage. IRM restoration showed 80% and MTA showed 60% adequate restoration without leakage when applied retrogradely. Repair of the perforations using the retrograde technique has significantly increased the number of the adequate restorations regardless the effect of the material factor. IRM showed the best sealing followed by MTA when applied retrogradely.Öğe Rezin esaslı kanal patları ve kök dentini arasında oluşan mikro boşlukların fotoğrafların sayısallaştırılması yöntemi ile incelenmesi(Selçuk Üniversitesi Sağık Bilimleri Enstitüsü, 2009) Akman, Melek; Belli, SemaBu çalışmanın amacı; farklı rezin esaslı kök kanal patları ve kor materyallerinden oluşturulan test gruplarının sızıntıya dirençlerinin ve kök kanal dolgusu kalitesinin bakteriyel sızıntı testi ve fotoğrafların sayısallaştırılması yöntemi ile incelenmesidir. Bu amaçla 129 adet ortodontik veya periodontal nedenlerle çekilmiş, benzer boyda ve kalınlıkta yuvarlak, tek kanallara sahip dişler kullanıldı. Dişlerin kron kısımları mine sement sınırından devamlı su soğutması altında ayrıldı. Kök kanallarının apikalleri 0.06/#45, olacak şekilde K3 döner alet sistemi kullanılarak hazırlandı. Dişler ekteki şekilde, farklı patlar ve kore materyallerinden oluşturulan 7 deney grubu (n=15) ve 2 kontrol grubu (n=12)'na ayrıldı: Acroseal/K3 Güta-perka, Diaket/K3 Güta-perka, AH Plus Jet/K3 Güta-perka, MetaSeal/K3 Güta-perka, MetaSeal/Resilon, RealSeal/Resilon, RealSeal/K3 Güta-perka. Tüm gruplardaki örnekler aseptik koşullarda açılı tek kon tekniği ile doldurulduktan sonra iki odalı sisteme bakteriyel sızıntısını ölçmek üzere yerleştirildi. Bakteriyel sızıntıya dirençleri 60 gün boyunca takip edildi ve elde edilen verilerle Kaplan-Meier testi ile istatistiksel analiz yapıldı. Örnekler bakteriyel sızıntı test düzeneğinden çıkarıldı ve %3'lük gluteraldehitte bekletilerek bakterilerin fiksasyonu sağlandı. Her gruptan rasgele seçilen 6 örnekten art arda su soğutmalı sistemle kesitler alındı. Elde edilen kesitler Leica MZ16A mikroskop, IC3D kamera ve stereoexplorer 2.1 yazılımından oluşan sistem kullanılarak X50 büyütme altında incelendi. Her bir kesitin incelenmesi için stereo fotoğraflar elde edildi. Kesitlerde görülen boşlukların alanları elde edilen görüntüler üzerinde oluşturulan matematiksel modeller üzerinde ölçüldü. Boşlukların miktarına grupların, kesitlerin ve bölgelerin etkisini incelemek için bu değerlere SPSS versiyon 16.0 kullanılarak Çok Yönlü Varyans analizi (ANOVA) ve Tukey HSD testleri uygulandı. Grupların bakteriyel sızıntıya dirençleri arasında anlamlı bir fark bulunmadı (p=0.76). Kesitler incelendiğinde boşluk miktarı yönünden MetaSeal/Resilon grubu istatistiksel olarak diğerlerinden farklıdır ve bu grupta daha fazla boşluk (1610.8µm2) vardır. Diğer gruplar arasında istatistiksel olarak fark yoktur (p=0.66). Tüm gruplarda güta-perka/Resilon- pat arasında oluşan boşluklar, dentin-pat arasında oluşan boşluklara ve patın kendi içinde oluşan boşluklara göre daha fazladır. Toplam boşluk apikal ilk 4 kesitte daha az, 15. kesitte daha fazladır. Deney gruplarının hiçbirinde örneklerin sızıntı gün sayısıyla, boşluksuz kesit sayısı arasında korelasyon tespit edilmemiştir .Öğe Tooth discoloration effects of calcium silicate based barrier materials used in revascularization and treatment with internal bleaching(ELSEVIER TAIWAN, 2017) Akbulut, Makbule Bilge; Terlemez, Arslan; Akman, Melek; Buyukerkmen, Begum; Guneser, Mehmet Burak; Eldeniz, Ayce UnverdiBackground/purpose: Usage of barrier materials is an important step in revascularization procedure. One of the undesired properties of these barrier materials is to cause coronal tooth discoloration. The aim of this in vitro study was to evaluate the tooth discoloration induced by ProRoot MTA (PMTA), Biodentine, and MM-MTA, as well as the efficacy of internal bleaching on this discoloration. Materials and methods: Forty-two maxillary incisor teeth were prepared. Triple antibiotic paste (TAP) was placed in the root canals and incubated for 3 weeks. After removing the TAP, blood embedded spongostans were inserted into the root canals, and PMTA, Biodentine, or MM-MTA was placed over them. The teeth were incubated for 4 weeks at 37 degrees C; then, the internal bleaching agent was sealed for one week. The tooth color was measured throughout the study and the color change values (Delta E) of each specimen were calculated, and the data was statistically analyzed using the one-way ANOVA and Tamhane's T2 tests. Results: The TAP significantly decreased the luminosity of the teeth (p < 0.05); however, no significant differences were observed between the tooth discolorations induced by the PMTA, Biodentine, and MM-MTA (p > 0.05). The teeth in the Biodentine group were more whitened than those of the PMTA and MM-MTA groups (p < 0.05). Conclusion: Although the PMTA, Biodentine, and MM-MTA caused similar color alterations in the teeth, more bleaching was observed on those teeth discolored using TAP + blood + Biodentine. (C) 2017 Association for Dental Sciences of the Republic of China. Publishing services by Elsevier B.V.Öğe The Use of Endodontically Treated and/or Fiber Post-Retained Teeth as Abutments for Fixed Partial Dentures(SPRINGER HEIDELBERG, 2012) Akman, Serhan; Akman, Melek; Eskitaşcıoğlu, Gürcan; Belli, SemaThe purpose of this in vitro study was to evaluate the effect of endodontic treatment with or without fiber-post restorations on the fracture strength of abutment teeth under fixed partial dentures (FPDs). Seventy extracted premolar and canine teeth were used. Groups of fiber-post-retained and root-filled teeth were endodontically treated. The teeth were embedded in an acrylic resin perpendicular to the horizontal plane to create fixed partial dentures. The following groups were created using different abutments: (1) sound (S) canine/S premolar, (2) S canine/endodontically treated (ET) premolar, (3) ET canine/S premolar, (4) ET canine/ET premolar, (5) S canine/fiber-post-restored (FPR) premolar, (6) FPR canine/S premolar, and (7) FPR canine/FPR premolar. Each tooth was prepared for a complete-coverage full-metal crown. Impressions were taken; metal frameworks were fabricated and cemented. The samples were exposed to 5,000 cycles of thermomechanical fatigue and loaded compressively until fracture (2 mm/min). The data were statistically analyzed using (Kruskal-Wallis test, alpha = 0.05). No significant difference was found among the mean fracture strengths of the groups (p = 0.696). There were distinct differences in failure patterns. All of the fracture types were horizontal, and neither vertical nor non-restorable root fractures were recorded. Premolars seemed to be a critical abutment compared to canines when they were sound under FPDs. The percentage of cervical fractures was high in endodontically treated teeth when compared to post-retained groups. In case of post-debonding, the abutment fracture did not occur. When root-filled teeth are used as abutments for FPDs, fiber-post restorations or the creation of abutments from similar structures (ET/ET or FPR/FPR) results in improved conservation of root structure under loading when compared to the abutments from different structures (S/ET, ET/S, FPR/S, S/FPR).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 .
