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Öğe Association of toll-like receptors 2, 3, and 4 genes polymorphisms with periapical pathosis risk(Medicina Oral S L, 2016) Özan, Ülkü; Ocak, Zeynep; Özan, Fatih; Oktay, Elif-Aybala; Toptaş, Orçun; Şahman, Halil; Yıkılgan, İhsan; Oruçoğlu, HasanBackground: The aim of this study was to investigate the role of gene variations of Toll-like receptors (TLR) 2, 3, and 4 on genetic susceptibility to periapical pathosis. Material and Methods: One hundred patients were included in the study and divided into two groups as follows; Control Group (n=50) that have root canal treatment and no periapical lesion, Patient Group (n=50) that have root canal treatment and periapical lesion. TLR2 Arg753Gln, TLR3 (c.1377C/T) and TLR4 Asp299Gly and Thr399Ile polymorphisms were genotyped by using PCR-RFLP. Genotypical analysis of control and patient groups were investigated to disclose whether there is any association between periapical lesions and gene variations. Results: There are no significant statistical differences between control and patient groups according to TLR 2 and 4 gene sequence. On the contrary, CC allele detected 74% for TLR 3 in patient group, and this difference was found to be statistically significant (p < 0.005). Conclusions: According to these results, it can be suggested that patients with Toll-like receptor 3 gene polymorphisms could be susceptible to periapical pathosis.Öğe Comparative analysis of three different filling techniques and the effects of experimental internal resorptive cavities on apical microleakage(2014) Keleş, Ali; Ahmetoğlu, Fuat; Ocak, Mevlüt Sinan; Dayı, Burak; Bozkurt, Alperen; Oruçoğlu, HasanObjectives: The aim of this study was to evaluate the sealing abilities of three different gutta-percha techniques in experimentally defective roots (EDR) and non-defective roots (NR). Materials and Methods: Sixty canine teeth were divided into six groups of ten; Group 1, NR + cold lateral condensation (CLC); Group 2, EDR + LC; Group 3, NR + BeeFill; Group 4, EDR + BeeFill; Group 5, NR + Thermafil; and Group 6, EDR + Thermafil. Apical leakage was measured using a computerized fluid filtration meter with a laser system. Results: Statistical analysis revealed that the CLC demonstrated more microleakage in the EDR than in the NR (P < 0.01). Thermafil demonstrated more microleakage in the NR than in the EDR (P < 0.01). No statistically significant differences were found between the BeeFill groups (P > 0.05). Conclusions: The results of this study indicate that internal resorptive cavities can affect the apical sealing properties of different root canal filling techniques, with Thermafil ensuring the lowest apical microleakage. © 2014 Dental Investigations Society.Öğe Comparison of apical microleakage of dual-curing resin cements with fluid-filtration and dye extraction techniques(Int Scientific Literature, Inc, 2015) Kaya, Sadullah; Özer, Senem Yiğit; Adigüzel, Özkan; Oruçoğlu, Hasan; Değer, YalçınBackground: Endodontically treated teeth with excessive loss of tooth structure are frequently restored using fiber posts. In this in vitro study, the apical leakage of self-and dual-activated curing modes for dual-curing resins cementing a translucent fiber post was evaluated using computerized fluid filtration meter and dye extraction method. Material/Methods: One hundred and four extracted human maxillary incisors with single root and canal were used. Experimental samples embedded in a closed system were divided into 4 groups (n=20) according to 2 dual-curing luting systems, with 2 different curing modes (either with self-or light-activation): (1) Panavia F 2.0 with self-cure, (2) Panavia F 2.0 with light-activation, (3) Clearfill SA with self-cure, and (4) Clearfill SA with light activation. Twenty-four teeth served as negative and positive controls. Translucent fiber posts were luted in the roots except in the control groups. Results: Statistical analysis indicated no significant difference in leakage among groups (p>0.05) with 4.12x10(-4) (Panavia self-cure), 4.55x10(-4) (Clearfill SA self-cure), 5.17x10(-4) (Panavia dual-cure), and 5.59x10(-4) (Clearfill SA dual-cure) in fluid-filtration method. Absorbance values for dye-extraction method were 266 nanometer (nm) (Panavia self-cure), 268 nm (Clearfill SA self-cure), 270 nm (Panavia dual-cure), and 271 nm (Clearfill SA dual-cure), in which difference among the groups were not statistically significant (p>0.05). When comparing the leakage, assessment methods results showed no statistically significant difference between the tested evaluation techniques (p>0.05). Conclusions: Light-and self-activation curing modes of Panavia F 2.0 and Clearfill SA perform similar to each other in a closed system.Öğe Comparison of apical microleakage of dual-curing resin cements with fluid-filtration and dye extraction techniques(International Scientific Literature Inc., 2015) Kaya, Sadullah; Özer, Senem Yiğit; Adigüzel, Özkan; Oruçoğlu, Hasan; Değer, Yalçın; Tümen, Emin Caner; Uysal, İbrahimBackground: Endodontically treated teeth with excessive loss of tooth structure are frequently restored using fiber posts. In this in vitro study, the apical leakage of self- and dual-activated curing modes for dual-curing resins cementing a translucent fiber post was evaluated using computerized fluid filtration meter and dye extraction method. Material/Methods: One hundred and four extracted human maxillary incisors with single root and canal were used. Experimental samples embedded in a closed system were divided into 4 groups (n=20) according to 2 dual-curing luting systems, with 2 different curing modes (either with self- or light-activation): (1) Panavia F 2.0 with self-cure, (2) Panavia F 2.0 with light-activation, (3) Clearfill SA with self-cure, and (4) Clearfill SA with light activation. Twenty-four teeth served as negative and positive controls. Translucent fiber posts were luted in the roots except in the control groups. Results: Statistical analysis indicated no significant difference in leakage among groups (p>0.05) with 4.12×10–4 (Panavia self-cure), 4.55×10–4 (Clearfill SA self-cure), 5.17×10–4 (Panavia dual-cure), and 5.59×10–4 (Clearfill SA dual-cure) in fluid-filtration method. Absorbance values for dye-extraction method were 266 nanometer (nm) (Panavia self-cure), 268 nm (Clearfill SA self-cure), 270 nm (Panavia dual-cure), and 271 nm (Clearfill SA dual-cure), in which difference among the groups were not statistically significant (p>0.05). When comparing the leakage, assessment methods results showed no statistically significant difference between the tested evaluation techniques (p>0.05). Conclusions: Light- and self-activation curing modes of Panavia F 2.0 and Clearfill SA perform similar to each other in a closed system. © Med Sci Monit, 2015.Öğe Comparison of the Sealing Ability of Biodentine, iRoot BP Plus and Mineral Trioxide Aggregate(2016) Mutlu, Seda Aydemir; Cimilli, Hale; Gerni, Parla Meva; Bozkurt, Durmuş Alperen; Oruçoğlu, Hasan; Chandler, Nicholas; Kartal, NevinObjective: The aim of this study was to compare the sealing ability of two new root repair materials, Biodentine and iRoot BP Plus against ProRoot MTA when used as root-end fillings. Methods: The root canals of 45 extracted maxillary anterior teeth were prepared with ProTaper instruments. After apical resection and ultrasonic root-end cavity preparation, the teeth were divided into three groups. The cavities in the first group of 15 were filled with Biodentine, the second with iRoot BP Plus and the third with ProRoot MTA. A computerized fluid filtration method assessed the seal at 2, 10 and 28 days. Results: Significant differences were found between Groups 1-2, Groups 1-3 and between Groups 2-3 at all-time intervals (P < 0.05). Leakage was not significantly different at 10 and 28 days for Biodentine and iRoot BP Plus (P > 0.05). Conclusion: The two new root repair materials showed good performance and both offered improved handling properties compared to MTAÖğe Diş revaskülarizasyonu ve uygulama yöntemleri(2014) Ozan, Ülkü; Oruçoğlu, HasanPulpanın canlılığ ının korunması; beslenmenin sağ lanması ve patolojik situmulanların belirlenmesi gibi nedenlerden dolayı oldukça önemlidir. Nekrotik pulpalı ve kök geliş imi tamamlanmamış genç daimi diş lerin tedavisi ise oldukça zordur. Apeksifikasyon tedavisi ile baş arılı sonuçlar elde edilebilir ancak tedavinin uzun sürmesi ve kalsiyum hidroksit (Ca(OH)2) kullanımı sonrası dentinin kırılganlığ ının artması gibi dezavantajları vardır. Rejeneratif endodontik tedavi iş lemleri zarar görmüş pulpa ve dentin yapılarının yenilenmesini hedef almaktadır. Sunulan bu derleme makalesinde en son bilgiler ış ığ ında kök pulpasının revaskülarizasyonu ve uygulama yöntemleri sunulacaktır.Öğe Effect of spreader size on microleakage of roots filled with cold lateral compaction technique(Dental Investigations Society, 2015) Türk, Tuğba; Pişkin, Beyser; Oruçoğlu, Hasan; Aydin, BerdanObjectives: To evaluate the effect of spreader size on apical leakage of maxillary incisor teeth. Materials and Methods: A total of 75 permanent human teeth with no carious and no fracture or crack were used for this study. After removing the crown from the cementoenamel junction and the standardization of the root lengths, the specimens were randomly divided into five groups: Group 1 - Roots were not instrumented. Group 2 - Root canals were enlarged using the step-back technique to a #40 file and filled using cold lateral compaction (CLC) of gutta-percha (GP). Group 3 - During the filling procedure, the first spreader used was size 40. Group 4 - The first spreader used was size 35. Group 5 - The initial spreader used was size 25. The amount of leakage through the filled root canals was evaluated by computerized fluid filtration model. Statistical analyzes were done using Kruskal-Wallis test and Mann-Whitney test (P < 0.05). Results: There were statistically significant differences among the groups (P < 0.05). While the uninstrumented group (Group 1) had no leakage, instrumented but not filled roots (Group 2) demonstrated the highest leakage values. There were no differences between Group 3 and 4. Group 5 showed significantly less leakage than Group 3 and 4. Conclusion: Spreader size used during CLC of GP appeared to be a significant factor on apical leakage of roots. Using smaller size spreader during CLC may provide relatively less leakage. © 2015 Dental Investigations Society.Öğe EVALUATION OF DIFFERENT ROOT-END FILLING MATERIALS IN POINT OF APICAL MICRO-LEAKAGE BY THE COMPUTERIZED FLUID FILTRATION METER(2015) Çiçek, Ersan; Özsevık, A Semih; Cortcu, Murat; Oruçoğlu, HasanAmaç: Bu çalışmanın amacı, kök ucu dolgu maddesi olarak kullanılan n-butyl-2-cyanoacrylate'ın bilgisayarlı sıvı filtrasyon metresi ile apikal mikro-sızıntısının test edilmesidir. Gereç ve Yöntem: 79 adet çekilmiş tek kök kanallı insan mandibular premolar diş seçildi. Örnekler her grupta 13 diş olacak şekilde beş gruba ayrıldı ve AH Plus kanal patı kullanılarak kök kanalları dolduruldu. Obturasyondan sonra, kökler 300 açı ile rezeke edildi ve kök ucu dolguları kök ucu dolgu materyalleri ile yapıldı. Beş farklı kök ucu dolgu materyalinin sızdırmazlık dereceleri bilgisayarlı sıvı filtrasyon metodu kullanılarak ölçüldü. Bulgular: Apikal mikro-sızıntı ortalama değerleri, 120 kPa'da grup 1'den 5'e sırası ile 5.0±1.07x10-4, 4.0±1.5x10-4, 4.0±1.1x10-4 µl.cmH2O-1.min-1'dir. İstatistiksel olarak kök ucu dolgu materyalleri arasında anlamlı farlılık gözlenmedi (P>0.05). Sonuç: Bu tip cyanoacrylate ilk defa kök ucu dolu materyali olarak kullanıldı. Doku adezivi apikal cerrahide kök ucu dolgu materyali olarak kullanılabilirÖğe Evaluation of five different desensitizers: a comparative dentin permeability and SEM investigation in vitro(Bentham Science Publ Ltd, 2017) Yılmaz, Nasibe Aycan; Ertaş, Ertan; Oruçoğlu, HasanBackground/Objective: The purpose of this study was to evaluate the efficacy and durability of five different dentin desensitizers (Gluma Desensitizer Powergel, Bifluorid 12, Gluma Self Etch Bond, D/Sense Crystal, Nupro Sensodyne Prophylaxis Paste with Novamin) on tubule occlusion and dentin permeability reduction in vitro. Method: The quantitative changes in permeability of 100 dentin discs were measured after desensitizer treatments and following posttreatments of 6% citric acid challenge for 1 min or immersion in artificial saliva for 24 hours under hydrostatic pressure generated by a computerised fluid filtration meter. Qualitative SEM analyses were also carried out. Results: Dentin permeability decreased after desensitizer application in all groups. Nevertheless, only the difference between 'Gluma Self Etch Bond' and 'Nupro Sensodyne Prophylaxis Paste with Novamin' groups was significantly different (p<0.05). Dentin permeability increased significantly after post-treatments (p<0.05). There was no statistically difference among the citric acidsubgroups (p> 0.05). Of all the artificial saliva-subgroups, only the difference between 'D/Sense Crystal' and 'Bifluorid 12' was significantly different (p<0.05). In SEM analysis, morphological changes were detected on the dentin surface and within the tubules following desensitizer treatments and post-treatments. Conclusion: All the desensitizers significantly reduced dentin permeability by changing the morphology of the dentin surface and/or dentinal tubules. Following post-treatments, there was some reduction in the efficacy of the desensitizers which was represented by the reduction in permeability values. SEM analysis revealed some physical changes in the dentin structure which can partly give an explanation to the reduced efficacy of tested desensitizers.Öğe An evaluation of the apical seal in oval-shaped root canals prepared with either self- adjusting files or protaper files(2014) Helvacıoğlu, Dilek Yiğit; Oruçoğlu, Hasan; Yavuz, Tevfik; Yavuz, Cavit Işık; Yılmaz, Ayça; Kaba, Yusuf Nuri; Özden, SametObjectives: This study aimed to evaluate the apical seal obtained with lateral compaction of gutta-percha in oval-shaped root canals prepared with either self-adjusting files or ProTaper Universal rotary files. Materials and Methods: Twelve pairs of extracted mandibular premolars with oval-shaped root canals were randomly divided into two groups. The first group was biomechanically prepared with ProTaper Universal files, while the self-adjusting file system was used in the second group. The roots were better filled using cold lateral compaction of gutta-percha. Apical microleakage was measured with the computerized fluid filtration method. The results were analyzed statistically using the Mann-Whitney U test. Results: All of the roots in both groups showed leakage. Group 1 demonstrated significantly less microleakage (p<0.05). Conclusions: Instrumentation of oval-shaped canals using a self-adjusting file system with cold lateral compaction of gutta-percha demonstrated significantly greater apical microleakage when compared to ProTaper Universal. The apical leakage with different filling techniques, combined with self-adjusting files, should be evaluated in further studies.Öğe Evaluation of the effects of Er:YAG laser, Nd:YAG laser, and two different desensitizers on dentin permeability: in vitro study(Springer London Ltd, 2018) Kurt, Sevda; Kırtıloğlu, Tuğrul; Yılmaz, Nasibe Aycan; Ertaş, Ertan; Oruçoğlu, HasanThe purpose of this in vitro study was to evaluate and compare the efficacy of erbium-doped yttrium aluminum garnet (Er:YAG) laser, neodymium-doped yttrium aluminum garnet (Nd:YAG) laser, PrevDent nano-hydroxyapatite toothpaste plus Repairing Serum Kit (PNH), and NUPRO Sensodyne Prophylaxis Paste with NovaMin (NPP) on dentin permeability reduction. Forty dentin discs obtained from bovine incisors were divided into four study groups: Er:YAG laser-treated (2940nm; 0.2W, 80mJ/pulse, 3Hz); Nd:YAG laser-treated (1064nm; 1W, 10Hz); PNH-treated; and NPP-treated groups. The quantitative changes in permeability of each dentin disc were measured using a computerized fluid filtration method (CFFM) before and after desensitizer treatments. The data were analyzed using the Wilcoxon, paired-samples t, Kruskal-Wallis, and Mann-Whitney U tests. The dentin surfaces and tubules were also morphologically detected by scanning electron microscopy (SEM). In all groups, dentin permeability was significantly reduced after the desensitizer and laser treatments (p<0.05). Among the groups, we detected a significant difference in only when comparing the Er:YAG laser- and NPP-treated groups (p=0.034). SEM analysis revealed physical changes in the dentin surface in all groups. This in vitro study shows that all tested desensitizers and laser treatments reduced dentin permeability. Also, surface changes, such as complete or partial occlusion or shrinkage of dentin tubules, were observed in all groups. Although the laser groups performed best, the PNH protocol can be considered as an alternative therapeutic product. In addition, clinical and laboratory studies should be performed for this product, and their efficacy should be assessed by combined therapy with lasers.Öğe Evaluation of the permeability of five desensitizing agents using computerized fluid filtration(Medknow Publications & Media Pvt Ltd, 2015) Dündar, Ayşe; Yavuz, Tuğba; Oruçoğlu, Hasan; Daneshmehr, L.; Yalçın, MuhammetObjective: The aim of this study was to evaluate the permeability of five desensitizing agents using computerized fluid filtration (CFF) test method. Materials and Methods: Sixty dentin discs of 500 200-mm-thick were prepared from middle dentin of bovine incisors without exposed the pulp and then randomly divided into five groups (n = 12). The permeability of the discs was measured using the CFF test method before and after application of the following desensitizers: Admira Protect (Voco, Cuxhaven, Germany), Seal and Protect (Dentsply, Konstanz, Germany), Sensi Kill (DFL, Brazil), Systemp Desensitizer (Ivoclar Vivadent, Liechtenstein), BisBlock (Bisco, USA). Fluid movement measurements were made at 2-min intervals for 8 min, and a mean of the values obtained was calculated for each specimen. The results were analyzed using Kruskal-Wallis test and Wilcoxon signed ranks tests with a significance threshold of P < 0.05. Results: There were no significant differences in permeability among desensitizing agents (P > 0.05); however dentin permeability was reduced in all groups (P < 0.05). Conclusion: The in vitro fluid conductance of dentin discs were reduced by treating with these five desensitizing agents.Öğe GÜTA PERKA KONLARIN KİMYASAL DEZENFEKSİYONUNUN APİKAL SIZINTI ÜZERİNDEKİ ETKİSİ(2013) Üstün, Yakup; Dinçer, Asiye Nur; Yıldırım, Cihan; Sağsen, Burak; Oruçoğlu, Hasan; Aslan, BernaAmaç: Çalışmanın amacı farklı kimyasal dezenfeksiyon işlemleri uygulanmış güta perka konlarla yapılan kök kanal dolgularının apikal sızıntı yönünden incelenmesi. Gereç ve yöntemler: Seksen bir adet yeni çekilmiş insan maksillar kesici diş seçildi ve 5 gruba ayrıldı. Grup 1: On beş diş güta perka ve AH Plus ile dolduruldu. Grup 2: Güta perka ve AH Plus ile kanal dolgusu yapılmadan önce güta perka konları %5'lik sodyum hipoklorit (NaOCl) solüsyonu içerisinde 1 dakika bekletildi. Grup 3: Güta perka ve AH Plus ile kanal dolgusu yapılmadan önce güta perka konları %5'lik sodyum hipoklorit solüsyonu içerisinde 5 dakika bekletildi. Grup 4: Güta perka ve AH Plus ile kanal dolgusu yapılmadan önce güta perka konları %2'lik Klorheksidin (CHX) solüsyonu içerisinde 1 dakika bekletildi. Grup 5: Güta perka ve AH Plus ile kanal dolgusu yapılmadan önce güta perka konları %2'lik Klorheksidin (CHX) solüsyonu içerisinde 5 dakika bekletildi. Pozitif kontrol grubu için 3 diş kullanıldı ve dişlerin kanalları doldurulmadı. Negatif kontrol grubu için 3 diş kullanıldı ve dişlerin tüm yüzeyleri tırnak cilası ile kaplandı. Apikal sızıntı değerleri, bilgisayarlı sıvı filtrasyon testi ile belirlendi. Verilerin istatistiksel analizi Kruskal Wallis testiyle yapıldı. Bulgular: Sonuçlara göre CHX 1', CHX 5', NaOCl 1' ve NaOCl 5' uygulanmış gruplar ve dezenfeksiyon uygulanmamış gruplar arasında apikal sızıntı açısından anlamlı farklılık yoktur.(p>0,05) Sonuç: Güta perka konlarının CHX ve NaOCl ile dezenfeksiyonu kök kanal dolgularında apikal sızıntı değerlerini arttırmamıştır.Öğe Influence of dynamic loading and different ddhesive systems on the microleakage in root canals(Taylor & Francis Ltd, 2012) Özdemir, Erdem; Erkut, Selim; Gülşahi, Kamran; Lin, Wei-Shao; Oruçoğlu, HasanThe objective of this study was to evaluate the influence of dynamic loading and different adhesive systems on the microleakage in root canals. 80 human premolars were used in this study. The crowns of the teeth were sectioned at the cemento-enamel junction using a low speed diamond saw. After post space preparation, the roots were randomly assigned to 4 groups (n = 20) and restored with different adhesive systems. Group 1: Rely X ARC (RA) + Single Bond (SA), Group 2: Clearfil SA Cement (CL), Group 3: Panavia F 2.0 (PAN), Group 4: Rely X Unicem (RU). All the teeth were restored with the same type of glass fiber post and coronal cores built up with light-polymerizing hybrid composite resin. Half of the specimens of each group (n = 10) were subjected to additional dynamic loading in a universal testing machine. Apical parts of the roots were attached to computerized fluid filtration device for leakage measurement. The two-way ANOVA test was used first to detect overall significance, followed by two-sample t-test to identify which pairs of groups had significant differences. For each outcome statistical significance was set at p < 0.05. Dynamic loading significantly increased the microleakage values for Rely X ARC (p = 0.005), Clearfil SA Cement (p = 0.002) and Rely X Unicem groups (p = 0.001) but Panavia F 2.0 group was not affected by the dynamic loading (p = 0.111). One-way ANOVA test was applied to detect any significant differences in microleakage values for the adhesive systems. In the unloaded groups, there is no difference between the adhesive systems (p = 0.13). For the dynamically loaded groups, there is only significant difference between PAN and RA groups (p = 0.010). Post-hoc pairwise comparisons were done using Tukey's multiple comparisons. Differences between Rely X ARC-Clearfil SA Cement and Rely X ARC-Panavia F 2.0 are statistically significant (p = 0.009, 0.013). Although microleakage values increased after dynamic loading when Rely X Unicem, Rely X ARC and Clearfil SA Cement were used, however microleakage values did not change when Panavia F 2.0 was used. Panavia F 2.0 showed better results compared to the other adhesive systems. (C) Koninklijke Brill NV, Leiden, 2012Öğe Influence of post space preparation on the apical leakage of Calamus, single-cone and cold lateral condensation obturation techniques: A Computerized fluid filtration study(Wiley, 2019) Kayahan, Zeynep Özkurt; Barut, Güher; Ulusoy, Zuhal; Oruçoğlu, Hasan; Kayahan, Mehmet Baybora; Kazazoğlu, Ender; Haznedaroğlu, FarukPurpose Apical microleakage between the root canal and periapical tissues is considered a common cause of endodontic failure. The aim of this study was to evaluate the apical microleakage of various obturation techniques after immediate post space preparations with different drills. Materials and Methods One hundred twenty human single-rooted teeth were selected for this study. The coronal portions were removed to achieve a uniform length of 15 mm. All root canals were instrumented with ProTaper Next rotary files using crown-down technique. The 120 roots were randomly assigned to 3 experimental groups according to obturation technique (n = 40). The root canals were obturated with lateral condensation in group 1, single-cone technique in group 2, and Calamus 3D obturation system in group 3. Each group was divided into two subgroups (n = 20) according to drill types (Gates Glidden and Peeso drills) leaving 5 mm of apical gutta-percha. The apical microleakage was measured using the computerized fluid filtration meter method. The results were evaluated using Kruskal-Wallis test with Bonferroni Corrected Mann-Whitney U multiple comparison post hoc tests. Results There was no statistically significant difference between obturation techniques after post space preparation with Peeso drills (p > 0.05). In Gates Glidden drill groups, single-cone technique demonstrated higher leakage (0.0051 +/- 0.0037 mu l x min(-1) x cmH(2)O(-1)) than Calamus techniques (0.0019 +/- 0.0012 mu l x min(-1) x cmH(2)O(-1)) (p < 0.017). Conclusions Gates Glidden drills caused the highest apical leakage in teeth obturated with single-cone technique.Öğe Microleakage of 4 post-luting cements evaluated by the computerized fluid filtration method(Sage Publications Ltd., 2015) Ceyhanlı, Kadir Tolga; Oruçoğlu, Hasan; Erdilek, Necdet; Türkün, Murat; Akdağ, Mustafa S.Purpose: The aim of this study was to evaluate the microleakage of 4 fiber post-luting systems using the computerized fluid filtration method. Methods: 60 extracted human mandibular permanent premolar teeth were used for the study. The teeth were instrumented with Hedstroem files up to size 60, post spaces were prepared and then Unicore fiber posts were cemented using 4 luting systems. Group1: Duolink, Group 2: Resinomer, Group 3: Fuji Plus, Group 4: Multilink Sprint, Group 5: Positive Control, and Group 6: Negative Control. The samples were stored in distilled water for 2 weeks and then microleakage was evaluated. Data were analyzed with 1 way-ANOVA and Dunett T3 tests (P<.05). Groups 2 and 3 significantly exhibited higher microleakage values than groups 1 and 4 (P<.05). Results: Resin cements used with total etch-bonding systems demonstrated lower microleakage values than the other cements. Conclusions: Reduction of steps in dentin conditioning of resin luting cements may have a promoting effect on microleakage.Öğe Push-out bonding strengths of four different dowel systems luted with two different adhesive systems(Taylor & Francis Ltd, 2014) Oruçoğlu, Hasan; Yavuz, Tevfik; Demir, Necla; Öztürk, Nilgün; Öztürk, BoraThis in vitro study investigates the bonding capacity of resin cements to dowels, using the push-out bonding strength of four different dowel systems, namely, stainless steel dowels (SSD), resin-supported polyethylene fiber dowels (RSPFD), zirconia dowels (ZD), and superpost glass fiber dowels (GFD), luted in root canals, using two different resin cements, namely, Multilink Automix Cement and Clearfil Esthetic Cement. Ninety-six maxillary central incisor teeth were sectioned below the cementoenamel junction, and the roots were treated endodontically. Then the roots were placed into four groups, based on the dowel systems used. The roots were further placed into two subgroups, based on the cement type used as subgroup A and subgroup B. Push-out bonding tests were performed on the bonded specimens, which were cut into 1mm thick sections. A two-way ANOVA test and Tukey's HSD tests were performed. The push-out bonding strength values for SSD, ZD, and RSPFD were not significantly different (p>0.05). The means for GFD were significantly higher than the means for ZD (p<0.05) when Multilink Automix Cement was used. However, when Clearfil Esthetic Cement was used, the means for RSPFD were significantly higher (p<0.001) than the means for the other systems. When Clearfil Esthetic Cement was used, the RSPF dowel system provided significantly higher bonding strength values than the other systems.
