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Öğe Adhesion of a Newly Developed Sealer to Dentin(Int Amer Assoc Dental Researchi A D R/A A D R, 2003) Çobankara, Funda Kont; Altınöz, H. C.; Belli, Sema[Abstract not Available]Öğe Adhesion of a newly developed sealer to dentin: An in vitro study(2006) Çobankara, Kont Funda; Oruçoğlu, Hasan; Belli, SemaGiriş: Endodontik kanal dolgu patlarının kök kanal dentinine adezyonu, kanal duvarı ile dolgu materyali arasındaki ilişkiyi göstermek açısından önemli ipuçları verir. Amaç: Bu çalışmanın amacı yeni bir kök kanal dolgu patı olan RC Sealer'm dentine adezyonunu RoekoSeal, AH26 (gümüşsüz) ve Ketac-Endo'yla karşılaştırmaktı. Materyal ve Metot: Çalışmada 60 adet insan 3. molar dişi kullanıldı. Tensile dayanım testi için dişlerin kronları orta üçlü bölgesinden yatay olarak kesilerek pulpa odası tavanı dentin yüzeyleri kullanıldı. Kanal dolgu patları özel olarak dizayn edilmiş alüminyum parçalar yardımıyla dik açıyla olacak şekilde bu örnekler üzerine yerleştirildi. Hazırlanan örnekler kanal dolgu patı sertleşmesi için 7 gün süreyle 37C sıcaklıkta ve nemli atmosferde inküba-törde bekletildi. Daha sonra düzenek universal testing machine (Testometric Micro 500, İngiltere) için hazırlanan bir alüminyum çerçeve içine yerleştirildi ve örneklere 0.5 mm.dak.-l hızla tensile güç uygulandı. Veriler MPa olarak kaydedildi ve sonuçlar istatisiksel olarak değerlendirildi. Bulgular: Çalışma sonuçları dentine adezyon yönünden RC Sealer'la AH26 ve RoekoSeal'le Ketac-Endo arasında istatistiksel olarak anlamlı bir fark olmadığını (p0.05), ancak RC Sealer ve AH26'nın adezyonunun RoekoSeal ve Ketac-Endo'dan daha yüksek olduğunu gösterdi (p0.05). Sonuç: Çalışmada test edilen materyallerin tümü dentine adezyon özelliği göstermiştir. Ancak RC Sealer ve AH26 kanal dolgu patları Ketac-Endo ve RoekoSeal'le karşılaştırıldığında daha iyi adezyon potansiyeline sahip bulunmuştur.Öğe Adhesive Sealing of the Pulp Chamber(Elsevier Science Inc, 2001) Belli, Sema; Zhang, Yi; Pereira, Patricia N. R.; Pashley, David H.The purpose of this in vitro study was to evaluate quantitatively the ability of four different filling materials to seal the orifices of root canals as a secondary seal after root canal therapy. Forty extracted human molar teeth were used. The top of pulp chambers and distal halves of the roots were removed using an Isomet saw. The canal orifices were temporarily sealed with a gutta-percha master cone without sealer. The pulp chambers were then treated with a self-etching primer adhesive system (Clearfil SE Bond), a wet bonding system (One-Step), a 4-methacryloyloxyethyl trimellitate anhydride adhesive system (C&B Metabond), or a reinforced zinc oxide-eugenol (IRM). The specimens were randomly divided into four groups of 10 each. A fluid filtration method was used for quantitative evaluation of leakage. Measurements of fluid movement were made at 2-min intervals for 8 min. The quality of the seal of each specimen was measured by fluid filtration immediately and after I day, 1 wk, and 1 month. Even after I month the resins showed an excellent seal. Zinc oxide-eugenol had significantly more leakage when compared with the resin systems (p < 0.05). Adhesive resins should be considered as a secondary seal to prevent intraorifice microleakage.Öğe An Alternative Adhesive Strategy to Optimize Bonding to Root Dentin(ELSEVIER SCIENCE INC, 2011) Belli, Sema; Cobankara, Funda Kont; Ozcopur, Betul; Eliguzeloglu, Evrim; Eskitascioglu, GurcanIntroduction: This study examined the hypothesis that the shear-bond strengths of AH Plus (AH) and Hybrid Root Seal (HRS) to root dentin might be optimized by using a powdered dentin-reinforced bonding procedure. Methods: The surfaces of root halves obtained from extracted human premolars were ground (800-grit silicon carbide paper), treated (5.25% NaOCl 17% EDTA for 5 minutes followed by distilled water) and randomly allocated into two groups according to the sealer and then into three subgroups according to bonding procedure. Dentin particles with a maximum size of 25 mu m were incorporated into the adhesive of Clearfil Liner Bond 2V, and groups were created as follows: no adhesive, adhesive alone, and with powdered dentin reinforced adhesive; 3 x 3 mm high buildups were created using sealer and allowed to set (37 degrees C, 100% humidity, 72 hours). Shear tests were performed (1 mm/min). Data were calculated as MPa and analyzed (two-way analysis of variance, Tukey test). Results: A significant difference was found between the groups (P = .000). Adhesive or reinforced adhesive had a negative effect on the shear-bond strength of AH, but they significantly increased the shear-bond strength of HRS (P = .000). HRS showed a similar bond strength with either adhesive alone or adhesive reinforced with powdered dentin. AH group was characterized by mixed failure, whereas the predominant failure type of the HRS group was cohesive failure within the sealer. Conclusions: Reinforcing adhesive resin with powdered dentin may be considered an alternative for optimizing the bonding of methacrylate-based sealers to root dentin and might affect the shear bond strength. (J Endod 2011;37:1427-1432)Öğe Are dentin posts biomechanically intensive?: A laboratory and FEA study(TAYLOR & FRANCIS LTD, 2014) Belli, Sema; Celik, Kezban; Akbulut, Makbule Bilge; Guneser, Mehmet Burak; Eraslan, Oguz; Eskitaccioglu, GurcanThe goal of this laboratory and finite elemental stress analysis (FEA) study was to compare fracture strength of dentin post (DP) with stainless steel and glass fiber posts. Single-rooted teeth were decoronated and restored with ParaPost (PP), i-TFC (TFC), and DPs (n=10). Resin cores were created and loaded until failure (1.0mm/min). The data were analyzed (ANOVA, Tukey, Chi-Square tests). Three-dimensional FEA models of the posts were created and the stress distributions were calculated using Solid Works/Cosmos works structural analysis program. A significant difference was found among the groups (p<0.001). TFC group showed the highest and the DP group showed the lowest fracture resistance (p<0.001). PP created more stress at the root dentin and inside the post. Restoration of roots with glass fiber and DPs may reduce stresses within the core material and the remaining root. However, a fracture-resistant restoration cannot be achieved by using a DP.Öğe Assessment of Antibacterial Activity of Endorez(Mosby-Elsevier, 2006) Eldeniz, Ayçe Ünverdi; Erdemir, Ali; Hadimli, Hasan Hüseyin; Belli, Sema; Erganis, OsmanObjective. The aim of this in vitro study was to evaluate antibacterial activity of a new resin based sealer, EndoREZ in comparison with 5 other sealers: AH 26, Diaket, Sultan, Apexit, and RoekoSeal. Study design. The effect of 6 different sealers oil the growth of 3 bacteria (Enterococcus faecalis, Staphylococcus aureus, and Pseudomonas aeruginosa) was measured using the agar diffusion test (ADT) and direct contact test (DCT). For ADT, 200 mu L bacterial suspensions were spread oil agar plates and freshly mixed sealers were applied to uniform wells punched in the agar. The zones of inhibition of bacterial growth were measured at 24 hours, 48 hours, 7 days, and 10 days. For DCT, 2 sets of sealers were prepared: fresh and 24-hour samples. Fresh samples were used within 20 minutes of mixing time while 24-hour samples were allowed to set it) a humid atmosphere at 37 degrees C for 24 hours before testing. Sealers were mixed and placed oil the walls of microliter plate wells and 10-mu L bacterial Suspensions were allowed to directly contact the sealers for I hour. Fresh media were added and 15 mu L were transferred from this plate to another plate containing fresh medium (215 mu L). Bacterial growth of this last plate was then measured using spectrophotometer every hour over 16 hours. Results. ADT results indicated that EndoREZ, Apexit, and RoekoSeal did not show any, antibacterial activity. In DCT results, AH 26 and Sultan were potent bacterial growth inhibitors. Conclusion. EndoREZ is not as potent a bacterial growth inhibitor as Sultan and AH 26.Öğe Bond Strength Between Root Dentin and Three Glass-Fiber Post Systems(Mosby-Elsevier, 2006) Kalkan, Mustafa; Üşümez, Aslıhan; Öztürk, A. Nilgün; Belli, Sema; Eskitaşcıoğlu, GürcanStatement of problem. Glass-fiber posts were introduced for use after endodontic therapy instead of metal alloy and ceramic posts. There are several new types of glass-fiber post systems available, but little is known about how well these posts bond to the root surface. Purpose. The purpose of this in vitro study was to compare the bond strengths of 3 different types of glass-fiber post systerns-opaque, translucent, and electrical glass-in 3 different locations of prepared post spaces. Material and methods. Sixty human intact single-rooted extracted teeth were used. The root canals were prepared using a step-back technique and obturated with gutta-percha using lateral condensation. The roots were divided into 3 experimental groups and further divided into 2 subgroups according to testing time (n = 10). Roots were restored with 1 of the following post systems according to the manufacturer's instructions: opaque glass-fiber posts (Snowpost), translucent glass-fiber posts (FiberMaster), and electrical glass-fiber posts (Everstick). A self-etching primer (Clearfil Liner Bond) was applied to the walls of the post spaces, allowed to etch for 30 seconds, and gently air dried. A dual-polymerized bonding agent (Clearfil Liner Bond, Bond A and B) was then applied to the same walls. A dual-polymerizing resin luring agent (Panavia F) was mixed for 20 seconds and then placed in the post spaces using a lentulo spiral instrument. The roots were placed in light-protected cylinders; then the light source was placed directly on the flat cervical tooth surfaces and the cement was polymerized. Specimens were stored in light-proof boxes for 24 hours or 1 week after the polymerization procedure. Each root was cut horizontally, and six 1-mm-thick root segments (2 apical, 2 middle, and 2 cervical) were prepared. Using a push-out test, the bond strength between post and dentin was measured after 24 hours or I week using a universal testing machine. Statistical analysis was performed with 3-way ANOVA followed by independent t tests (alpha = .05) to detect differences between groups defined by the specific interacting variables. The different combinations of posts and luting material from the cervical segments were analyzed with SEM. Results. The 3-way ANOVA indicated that push-out test values varied significantly according to the post system used (opaque, electrical, and translucent) (P < .01); the root segments (cervical, middle, and apical) (P < .01), however, did not vary statistically according to the time of testing (24 hours and 1 week). Opaque and electrical glass-fiber posts showed higher bond strength values than translucent posts (P < .01). Push-out bond strength values of cervical segments were significantly higher than the middle and apical segments in translucent and electrical glass-fiber post groups (P < .01). In the opaque glass-fiber post group, there were no significant differences between cervical and middle segments. In SEM analysis, a distinct hybrid zone with long, numerous resin tags located between luting material and dentin was exhibited in all post systems. Conclusion. The opaque and electrical glass-fiber posts exhibited similar bond strengths, and translucent posts exhibited the lowest bond strength. The highest bond strength was observed in the cervical third of the post spaces for translucent and electrical glass-fiber post groups.Öğe Bonding Strength to Two Different Surfaces of Dentin Under Simulated Pulpal Pressure(2001) Belli, Sema; Ünlü, N.; Özer, F.Purpose: The purpose of this in vitro study was to measure and compare the in vitro shear bond strengths (SBS) of the following dentin bonding systems to different dentin surfaces under simulated pulpal pressure: Liner Bond 2 (self-etching) (LB2), Liner Bond 2V (self-etching) (LB2V), Opti Bond Solo (single component) (OBS), Fuji Bond LC (filled) (FBLC), Prime & Bond 2-1 (single component) (P&B2-1), and Solid Bond (total etching) (SB). Materials and Methods: Occlusal and buccal surfaces of 60 extracted human molars were prepared to expose the dentin bonding surface. After being wet ground with 600-grit abrasive papers, teeth were randomly assigned to 6 equal groups of 10 each. The dentin surfaces were treated with the bonding systems mentioned above, and resin composite cylinders (Clearfil AP-X) were built up under simulated pulpal pressure when diluted bovine serum was used as the pulpal fluid. After one day of storage in 37°C water, the specimens were shear tested to failure on an Instron machine. Results: The data were statistically analyzed with the Student's t-test and a post hoc Tukey test. Comparing buccal surfaces, the post hoc Tukey test indicated no significant differences among all the test groups (p > 0.05). On occlusal surfaces, the post hoc Tukey test indicated significant differences among the tested groups (p < 0.05). The Student's t test revealed significant differences between the occlusal and buccal shear bond strength values in LB 2, LB2V, and SB groups (p < 0.05). Conclusion: The strength of adhesion to dentin depends upon both the adhesive system used - with selfetching systems tending to show higher bond strengths than the other materials tested - and the location of the dentin, with significantly higher SBS being found on buccal surfaces in 3 of the 7 tested bonding systems.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 Can Degradation of Adhesive Interfaces Due to Water Storage Affect Stress Distributions? A Finite-Element Stress Analysis Study(QUINTESSENCE PUBLISHING CO INC, 2016) Belli, Sema; Eraslan, Oguz; Eskitascioglu, GurcanPurpose: The aim of this finite-element stress analysis (FEA) was to determine the effect of degradation due to water storage on stress distributions in root-filled premolar models restored with composite using either a self-etch (SE) or an etch-and-rinse (E&R) adhesive. Materials and Methods: Four premolar FEA models including root filling, MOD cavity, and composite restorations were created. The cavities were assumed to be treated by SE or E&R adhesives and stored in water for 18 months. The elastic properties of the adhesive-dentin interface after 24-h and 18-month water storage were obtained from the literature and applied to the FEA models. A 300-N load was applied on the functional cusps of the models. The SolidWorks/Cosmosworks structural analysis program was used and the results were presented considering the von Mises stresses. Results: Stresses in the cervical region increased over time on the load-application side of the main tooth models (SE: 84.11 MPa to 87.51 MPa; E&R: 100.24 MPa to 120.8 MPa). When the adhesive interfaces (hybrid layer, adhesive layer) and dentin were evaluated separately, the stresses near the root canal orifices increased over time in both models; however, this change was more noticeable in the E&R models. Stresses at the cavity corners decreased in the E&R model (within the adhesive layer), while SE models showed the opposite (within the hybrid layer). Conclusion: Change in the elastic modulus of the adhesive layer, hybrid layer, and dentin due to water storage has an effect on stresses in root-filled premolar models. The location and the level of the stresses differed depending on the adhesive used.Öğe Clinical Evaluation of a Compomer Resin in Class V Abrasion Lesions: Four Years Results.(Int Amer Assoc Dental Researchi A D R/A A D R, 2002) Ünlü, Nimet; Belli, Sema; Özer, Faruk[Abstract not Available]Öğe A comparative evaluation of sealing ability of a new, self-etching, dual-curable sealer: Hybrid Root SEAL (MetaSEAL)(MOSBY-ELSEVIER, 2008) Belli, Sema; Ozcan, Erhan; Derinbay, Oznur; Eldeniz, Ayce UnverdiObjective. To assess the long-term sealing ability of a new dual-curable, self-etching, 4-META containing resin-based sealer: Hybrid Root SEAL (MetaSEAL in the United States) and compare with RealSeal and AH Plus sealers. Methodology. Root canals of 44 extracted and decoronated single-rooted human teeth were instrumented using a crown-down technique with ProFile 0.04 tapered NiTi rotary instruments to ISO size 30 and then to size 45 with K-hand files. Four roots were selected and used as positive and negative controls (n = 2), the rest were randomly divided into 4 groups (n = 10) and filled using 0.04 tapered size 45 cones as follows: Group 1: AH Plus with gutta-percha; Group 2: Hybrid Root SEAL (MetaSEAL) with gutta-percha; Group 3: Hybrid Root SEAL (MetaSEAL) with Resilon point; and Group 4: RealSeal with Resilon point. The quality of seal of each specimen was measured after 1, 4, 12, and 24 weeks using a fluid transport model. Measurements were made at 2-minute intervals for 8 minutes. The data were calculated as Lp and statistically analyzed using 2-way repeated measures of ANOVA and Bonferroni pairwise comparison tests (alpha = 0.05). Results. There were no significant differences among test materials in terms of fluid microleakage values (P = .126). There were statistically significant differences among the time periods (P = .009) and observed between 1- and 24-week test periods. There was significant interaction between root canal filling materials and time of testing (P = .048). Conclusion. Within the limitations of this in vitro study, it was concluded that recently introduced Hybrid Root SEAL (MetaSEAL) showed similar sealing performance with RealSeal and AH Plus sealers when used either with gutta-percha or Resilon at 24 weeks. (Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2008; 106: e45-e52)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 Comparison of Two Different Bond Strength Tests (a Miroshear and a Microtensile Study).(INT AMER ASSOC DENTAL RESEARCHI A D R/A A D R, 2002) Eskitascıoğlu, G.; Karakaya, S.; Özyeşil, A. G.; Belli, Sema[Abstract not Available]Öğe Composite Bond Strength to Intact Enamel with Current Simplified Adhesives(QUINTESSENCE PUBLISHING CO INC, 2011) Kahveci, Ozlem; Belli, SemaPurpose: This study compared microtensile bond strength (mu TBS) of six simplified adhesive systems and an etch-and-rinse, one-bottle adhesive system to intact enamel. Materials and Methods: Twenty-eight sound incisor teeth were cut at the cementoenamel junction (CEJ) under water cooling. The enamel surfaces were cleaned with pumice, randomly assigned to seven groups and treated with one of the following adhesives: Hybrid Bond (Sun Medical); AdheSE One (Ivoclar/Vivadent); One Coat 7.0 (Coltene/Whaledent); Danville Experimental (Danville Materials); Clearfil S-3 Bond (Kuraray); G Bond (GC); and Prelude Total-etch (Danville Materials) as control. Composite resin (Clearfil AP-X, Kuraray) buildups were created and after 24 h, the teeth were sectioned into beams of 1.0 mm(2) cross-sectional area. Each beam was tested in a microtensile tester (Bisco) at a crosshead speed of 1 mm/min. Data were calculated as MPa and analyzed by one-way ANOVA. Multiple comparisons were done using the Tukey test. Results: mu TBS values of adhesives to intact enamel were as follows (mean +/- SD; different letters indicate statistically different groups, p < 0.05): Hybrid Bond: 15.62 +/- 3.90(a); AdheSE One: 17.29 +/- 3.88(ab); One Coat 7.0: 19.59 +/- 3.95(abc); Danville Experimental: 18.65 +/- 5.33(abc); Clearfil S-3 Bond:20.89 +/- 2.96(bcd); G Bond: 23.49 +/- 4.21(cd); Prelude Total-etch: 25.79 +/- 5.24(d). Conclusions: Clearfil S-3 Bond and G Bond showed bond strength similar to Prelude Total-etch (p = 0.064). The other simplified adhesives showed a similar performance (p = 0.239), however, mu TBS values to intact enamel of these systems were lower than those obtained by Prelude Total-etch (p < 0.05).Öğe Conservative restoration of severely damaged endodontically treated premolar teeth: a FEM study(SPRINGER HEIDELBERG, 2011) Eraslan, Oznur; Eraslan, Oguz; Eskitascioglu, Gurcan; Belli, SemaThe aim of this finite element method (FEM) study was to test two different restorative techniques used for construction of severely damaged endodontically treated premolar teeth using Finite Element Stress Analysis Method. In this study, four types of three-dimensional (3-D) FEM mathematical models simulating (1) a sound lower single rooted premolar tooth with supporting structures; (2) a root-filled lower premolar tooth without lingual cusp, restored with resin composite; (3) a root-filled lower premolar tooth without lingual cusp restored with resin composite in combination with a polyethylene fiber which is placed circumferentially to help to create a composite lingual wall; (4) a root-filled lower premolar tooth without lingual cusp restored with resin composite in combination with a glass fiber post, were modeled. A 300-N static vertical occlusal load was applied on the node at the center of occlusal surface of the tooth to calculate stress distributions. Solidworks/Cosmosworks structural analysis programs were used for FEM analysis. The analysis of the von Mises stress values revealed that maximum stress concentrations were located at loading areas for all models. Root dentine tissue, lingual cortical bone, and apical bone structures were other stress concentration regions. There were stress concentration differences among the models at root dentine tissue. Although the distribution pattern was similar with composite resin restored tooth model, highest stress values were observed at root dentine in the model restored with post-and-core. Post structure accumulated more stress on its own body. Stress distribution patterns of sound tooth and fiber-reinforced restoration models were found as similar. The present study showed that the use of post material increased the stress values at root dentine structure while reinforcing the restoration with a fiber decreases stress transmission. Fiber-reinforced restoration provided stress distributions similar to sound tooth.Öğe Corono-apical Leakage of Various Root Filling Materials Using Two Different Penetration Models—A 3-Month Study(Wiley-Liss, 2010) Keçeci, Ayse Diljin; Üreyen Kaya, Bulem; Belli, SemaThe purpose of this study was to analyze the sealing ability of various filling combinations in a 90 days period using fluid transport and glucose penetration models. Premolars (n = 108) were filled with either gutta-percha (groups 1-4) or Resilon (groups 5-8) core materials combined with AH Plus (groups 1, 3, 5, 7) or Epiphany (groups 2, 4, 6, 8) sealers by using cold lateral compaction (groups 1, 2, groups 5, 6) or System B with Obtura II (groups 3 4, groups 7, 8). The sealing ability of each sample was evaluated through glucose and fluid penetration models. Penetration values of 90 days were statistically analyzed With three-way analysis of variance (ANOVA)and Duncan's Multiple Range tests (P < 0.05). No significant differences were found among the penetration values when the fluid filtration model was used (p > 0.05). On the contrary, statistically significant differences were obtained among the groups with the glucose penetration model (p < 0.05). AH Plus/Resilon/cold lateral compaction group had better sealing ability than the other combinations tested with the glucose penetration model.Öğe Direkt ve indirekt uygulanan kompozit laminate veneerlerin 2 yıllık klinik değerlendirilmeleri(1999) Belli, Sema; Özer, F. FüsunAmaç: Konservatif ve ekonomik bir yöntem olarak bilinen kompozit laminate veneerler, direkt ve indirekt olarak iki farklı yöntemle uygulanabilmektedirler. Her iki yöntemle uygulanan 70 kompozit laminate veneerin iki yıllık klinik başarısı karşılaştırılarak değerlendirilmiştir. Materyal ve metod: 44 direkt, 26 indirekt kompozit laminate veneer toplam 31 hastaya uygulandı. İndirekt veneer materyali olarak EOS, direkt veneer materyali olarak ise 3M kompozit materyali seçildi. Hastalar iki yıl sonunda kontrole çağrıldı ve veneerler önceden belirtilen kriterlere göre değerlendirildi. Bulgular: İki yıllık gözlemler sonucunda direkt kompozit laminate veneerlerin bağlanma dayanımı, indirekt kompozit laminate veneerlerin ise renk uyumunu koruması açısından daha başarılı olduğu gözlendi. Sonuç: Aşırı kuvvetle karşılaşabilecek bölgelerde direkt kompozit laminate veneerler, oral hijyeni kötü hastalarda ve aşırı kuvvetle karşılaşılması az olan bölgelerde indirekt kompozit laminate veneer tekniği uygulanabilir.Öğe Effect of 2% chlorhexidine gluconate cavity disinfectant on microtensile bond strength of tooth-coloured restorative materials to sound and caries-affected dentin(TAYLOR & FRANCIS LTD, 2015) Aykut-Yetkiner, Arzu; Candan, Umit; Ersin, Nazan; Eronat, Cemal; Belli, Sema; Ozcan, MutluThis study evaluated the effect of 2% chlorhexidine gluconate-based cavity disinfectant (CHX) on the microtensile bond strength (mu TBS) of glass ionomer, resin-modified glass ionomer and packable resin composite to sound and caries-affected dentin. Sound and occlusal caries-affected human third molars (N = 36, n = 3 per group) were randomly divided into three experimental groups to receive one of the following restorative materials. (a) Glass ionomer (Ketac Molar, 3M ESPE; GI), (b) resin-modified glass ionomer (Vitremer, 3M ESPE; RMGI) and (c) packable resin composite (Surefil, Dentsply; PRC) with a bonding agent (Prime Bond NT, Dentsply De Trey). Caries was removed using a caries-detecting dye (Caries Detector, Kuraray Medical Ltd.) and flat dentin surfaces were achieved by finishing up to 1200-grit silicon carbide abrasive. Half of the teeth in each group received 2% CHX (Consepsis, Ultradent). Dentin surfaces were built-up with the respective materials incrementally and were sectioned with a slow-speed saw into multiple beams. The beams were subjected to mu TBS test (0.5mm/min) in a Universal Testing Machine. The data were analysed using two-way analysis of variance and Tukey's tests. For each restorative material, mu TBS results were not affected by the application of CHX (p > 0.05) on both sound and caries-affected dentin (p > 0.05). PRC in combination with the corresponding bonding agent showed significantly higher results (p < 0.05) than those of GI and RMGI, on sound and caries-affected teeth, respectively. Cohesive failure in dentin was not observed in any of the groups. The use of 2% chlorhexidine-based cavity disinfectant did not impair the adhesion of the restorative materials tested to either sound or caries-affected dentin.Öğe The Effect of Additional Enamel Etching and a Flowable Composite to the Interfacial Integrity of Class Ii Adhesive Composite Restorations(OPERATIVE DENTISTRY INC, 2001) Belli, Sema; Inokoshi, S; Özer, Faruk; Pereira, PNR; Ogata, M; Tagami, JThis in vitro study evaluated the interfacial integrity of Class II resin composite restorations. The influence of a flowable composite and additional enamel etching was also evaluated. Deep, saucer-shaped Class LI cavities were prepared in the mesial and distal proximal surfaces of 25 extracted human molars and assigned to five treatment groups. The gingival margins were extended to approximately 1 mm above the CEJ in 40 cavities and below the CEJ in 10 cavities. The prepared cavities were then restored with a self-etching primer system (Clearfil Liner Bond LT) and a hybrid resin composite (Clearfil AP-X), with and without a flowable composite (Protect Liner Fl and additional enamel etching with 37% phosphoric acid gel (K-etchant). After finishing, polishing and thermocycling (4 and 60 degreesC, x300), the samples were longitudinally sectioned through the restorations and resin-tooth interfaces were observed directly under a laser scanning microscope. Statistical analysis indicated that the use of a flowable composite produced significantly more (p=0.04) gap-free resin-dentin interfaces than teeth restored without the flowable composite. However, both flowable composite and enamel etching could not prevent gap formation at enamel-resin interfaces and crack formation on enamel walls.
